From 50413c5439c46dca6f65dc0e6896aabe2fc8f536 Mon Sep 17 00:00:00 2001
From: Sergey Yakubov <sergey.yakubov@desy.de>
Date: Wed, 25 Apr 2018 15:56:20 +0200
Subject: [PATCH] start working at log files

---
 .../spd_log/include/spdlog/async_logger.h     |   82 +
 3d_party/spd_log/include/spdlog/common.h      |  161 +
 .../include/spdlog/details/async_log_helper.h |  398 ++
 .../spdlog/details/async_logger_impl.h        |  107 +
 .../include/spdlog/details/file_helper.h      |  145 +
 .../spd_log/include/spdlog/details/log_msg.h  |   50 +
 .../include/spdlog/details/logger_impl.h      |  373 ++
 .../include/spdlog/details/mpmc_bounded_q.h   |  176 +
 .../include/spdlog/details/null_mutex.h       |   45 +
 3d_party/spd_log/include/spdlog/details/os.h  |  490 ++
 .../spdlog/details/pattern_formatter_impl.h   |  686 +++
 .../spd_log/include/spdlog/details/registry.h |  225 +
 .../include/spdlog/details/spdlog_impl.h      |  268 +
 .../include/spdlog/fmt/bundled/LICENSE.rst    |   23 +
 .../include/spdlog/fmt/bundled/format.cc      |  535 ++
 .../include/spdlog/fmt/bundled/format.h       | 4659 +++++++++++++++++
 .../include/spdlog/fmt/bundled/ostream.cc     |   35 +
 .../include/spdlog/fmt/bundled/ostream.h      |  114 +
 .../include/spdlog/fmt/bundled/posix.cc       |  241 +
 .../include/spdlog/fmt/bundled/posix.h        |  424 ++
 .../include/spdlog/fmt/bundled/printf.cc      |   32 +
 .../include/spdlog/fmt/bundled/printf.h       |  712 +++
 .../spd_log/include/spdlog/fmt/bundled/time.h |  183 +
 3d_party/spd_log/include/spdlog/fmt/fmt.h     |   34 +
 3d_party/spd_log/include/spdlog/fmt/ostr.h    |   17 +
 3d_party/spd_log/include/spdlog/formatter.h   |   47 +
 3d_party/spd_log/include/spdlog/logger.h      |  110 +
 .../include/spdlog/sinks/android_sink.h       |   91 +
 .../include/spdlog/sinks/ansicolor_sink.h     |  133 +
 .../spd_log/include/spdlog/sinks/base_sink.h  |   51 +
 .../spd_log/include/spdlog/sinks/dist_sink.h  |   72 +
 .../spd_log/include/spdlog/sinks/file_sinks.h |  253 +
 .../spd_log/include/spdlog/sinks/msvc_sink.h  |   51 +
 .../spd_log/include/spdlog/sinks/null_sink.h  |   34 +
 .../include/spdlog/sinks/ostream_sink.h       |   47 +
 3d_party/spd_log/include/spdlog/sinks/sink.h  |   53 +
 .../include/spdlog/sinks/stdout_sinks.h       |   77 +
 .../include/spdlog/sinks/syslog_sink.h        |   81 +
 .../include/spdlog/sinks/wincolor_sink.h      |  121 +
 .../include/spdlog/sinks/windebug_sink.h      |   29 +
 3d_party/spd_log/include/spdlog/spdlog.h      |  192 +
 3d_party/spd_log/include/spdlog/tweakme.h     |  160 +
 3d_party/spd_log/readme                       |    1 +
 common/cpp/CMakeLists.txt                     |    3 +
 common/cpp/include/http_client/http_client.h  |    2 +
 common/cpp/include/logger/logger.h            |   34 +
 common/cpp/src/http_client/CMakeLists.txt     |    2 +-
 .../cpp/src/http_client/curl_http_client.cpp  |    2 +-
 .../http_client/curl_http_client.h            |    2 +-
 .../src/http_client/http_client_factory.cpp   |   10 +
 common/cpp/src/logger/CMakeLists.txt          |   23 +
 common/cpp/src/logger/fluentd_sink.cpp        |   24 +
 common/cpp/src/logger/fluentd_sink.h          |   26 +
 common/cpp/src/logger/logger_factory.cpp      |   28 +
 common/cpp/src/logger/spd_logger.cpp          |   83 +
 common/cpp/src/logger/spd_logger.h            |   31 +
 common/cpp/unittests/logger/test_logger.cpp   |   33 +
 config/fluentd/fluentd.conf                   |   13 +
 examples/worker/getnext_broker/CMakeLists.txt |    3 +
 receiver/CMakeLists.txt                       |    2 +-
 receiver/src/statistics_sender_influx_db.cpp  |    3 +-
 .../test_statistics_sender_influx_db.cpp      |    2 +-
 tests/automatic/CMakeLists.txt                |    4 +-
 tests/automatic/spd_logger/CMakeLists.txt     |    4 +
 .../spd_logger/console/CMakeLists.txt         |   16 +
 .../spd_logger/console/check_linux.sh         |   40 +
 .../spd_logger/console/check_windows.bat      |   31 +
 .../spd_logger/console/spd_logger_console.cpp |   60 +
 .../spd_logger/fluentd/CMakeLists.txt         |   15 +
 .../spd_logger/fluentd/check_linux.sh         |   20 +
 .../spd_logger/fluentd/check_windows.bat      |   31 +
 .../spd_logger/fluentd/spd_logger_fluentd.cpp |   20 +
 .../next_multithread_broker.cpp               |    1 -
 worker/api/cpp/CMakeLists.txt                 |    3 +-
 worker/api/cpp/src/server_data_broker.cpp     |    7 +-
 .../api/cpp/unittests/test_server_broker.cpp  |    2 +-
 76 files changed, 12381 insertions(+), 17 deletions(-)
 create mode 100644 3d_party/spd_log/include/spdlog/async_logger.h
 create mode 100644 3d_party/spd_log/include/spdlog/common.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/async_log_helper.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/async_logger_impl.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/file_helper.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/log_msg.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/logger_impl.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/mpmc_bounded_q.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/null_mutex.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/os.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/pattern_formatter_impl.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/registry.h
 create mode 100644 3d_party/spd_log/include/spdlog/details/spdlog_impl.h
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/LICENSE.rst
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/format.cc
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/format.h
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/ostream.cc
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/ostream.h
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/posix.cc
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/posix.h
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/printf.cc
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/printf.h
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/bundled/time.h
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/fmt.h
 create mode 100644 3d_party/spd_log/include/spdlog/fmt/ostr.h
 create mode 100644 3d_party/spd_log/include/spdlog/formatter.h
 create mode 100644 3d_party/spd_log/include/spdlog/logger.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/android_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/ansicolor_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/base_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/dist_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/file_sinks.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/msvc_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/null_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/ostream_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/stdout_sinks.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/syslog_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/wincolor_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/sinks/windebug_sink.h
 create mode 100644 3d_party/spd_log/include/spdlog/spdlog.h
 create mode 100644 3d_party/spd_log/include/spdlog/tweakme.h
 create mode 100644 3d_party/spd_log/readme
 create mode 100644 common/cpp/include/logger/logger.h
 rename common/cpp/{include => src}/http_client/curl_http_client.h (95%)
 create mode 100644 common/cpp/src/http_client/http_client_factory.cpp
 create mode 100644 common/cpp/src/logger/CMakeLists.txt
 create mode 100644 common/cpp/src/logger/fluentd_sink.cpp
 create mode 100644 common/cpp/src/logger/fluentd_sink.h
 create mode 100644 common/cpp/src/logger/logger_factory.cpp
 create mode 100644 common/cpp/src/logger/spd_logger.cpp
 create mode 100644 common/cpp/src/logger/spd_logger.h
 create mode 100644 common/cpp/unittests/logger/test_logger.cpp
 create mode 100644 config/fluentd/fluentd.conf
 create mode 100644 tests/automatic/spd_logger/CMakeLists.txt
 create mode 100644 tests/automatic/spd_logger/console/CMakeLists.txt
 create mode 100644 tests/automatic/spd_logger/console/check_linux.sh
 create mode 100644 tests/automatic/spd_logger/console/check_windows.bat
 create mode 100644 tests/automatic/spd_logger/console/spd_logger_console.cpp
 create mode 100644 tests/automatic/spd_logger/fluentd/CMakeLists.txt
 create mode 100644 tests/automatic/spd_logger/fluentd/check_linux.sh
 create mode 100644 tests/automatic/spd_logger/fluentd/check_windows.bat
 create mode 100644 tests/automatic/spd_logger/fluentd/spd_logger_fluentd.cpp

diff --git a/3d_party/spd_log/include/spdlog/async_logger.h b/3d_party/spd_log/include/spdlog/async_logger.h
new file mode 100644
index 000000000..e9fcd5f40
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/async_logger.h
@@ -0,0 +1,82 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Very fast asynchronous logger (millions of logs per second on an average desktop)
+// Uses pre allocated lockfree queue for maximum throughput even under large number of threads.
+// Creates a single back thread to pop messages from the queue and log them.
+//
+// Upon each log write the logger:
+//    1. Checks if its log level is enough to log the message
+//    2. Push a new copy of the message to a queue (or block the caller until space is available in the queue)
+//    3. will throw spdlog_ex upon log exceptions
+// Upon destruction, logs all remaining messages in the queue before destructing..
+
+#include "common.h"
+#include "logger.h"
+
+#include <chrono>
+#include <functional>
+#include <string>
+#include <memory>
+
+namespace spdlog
+{
+
+namespace details
+{
+class async_log_helper;
+}
+
+class async_logger SPDLOG_FINAL :public logger
+{
+public:
+    template<class It>
+    async_logger(const std::string& name,
+                 const It& begin,
+                 const It& end,
+                 size_t queue_size,
+                 const async_overflow_policy overflow_policy =  async_overflow_policy::block_retry,
+                 const std::function<void()>& worker_warmup_cb = nullptr,
+                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),
+                 const std::function<void()>& worker_teardown_cb = nullptr);
+
+    async_logger(const std::string& logger_name,
+                 sinks_init_list sinks,
+                 size_t queue_size,
+                 const async_overflow_policy overflow_policy = async_overflow_policy::block_retry,
+                 const std::function<void()>& worker_warmup_cb = nullptr,
+                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),
+                 const std::function<void()>& worker_teardown_cb = nullptr);
+
+    async_logger(const std::string& logger_name,
+                 sink_ptr single_sink,
+                 size_t queue_size,
+                 const async_overflow_policy overflow_policy =  async_overflow_policy::block_retry,
+                 const std::function<void()>& worker_warmup_cb = nullptr,
+                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),
+                 const std::function<void()>& worker_teardown_cb = nullptr);
+
+    //Wait for the queue to be empty, and flush synchronously
+    //Warning: this can potentially last forever as we wait it to complete
+    void flush() override;
+
+    // Error handler
+    virtual void set_error_handler(log_err_handler) override;
+    virtual log_err_handler error_handler() override;
+
+protected:
+    void _sink_it(details::log_msg& msg) override;
+    void _set_formatter(spdlog::formatter_ptr msg_formatter) override;
+    void _set_pattern(const std::string& pattern, pattern_time_type pattern_time) override;
+
+private:
+    std::unique_ptr<details::async_log_helper> _async_log_helper;
+};
+}
+
+
+#include "details/async_logger_impl.h"
diff --git a/3d_party/spd_log/include/spdlog/common.h b/3d_party/spd_log/include/spdlog/common.h
new file mode 100644
index 000000000..ea0b05670
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/common.h
@@ -0,0 +1,161 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <string>
+#include <initializer_list>
+#include <chrono>
+#include <memory>
+#include <atomic>
+#include <exception>
+#include<functional>
+
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+#include <codecvt>
+#include <locale>
+#endif
+
+#include "details/null_mutex.h"
+
+//visual studio upto 2013 does not support noexcept nor constexpr
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+#define SPDLOG_NOEXCEPT throw()
+#define SPDLOG_CONSTEXPR
+#else
+#define SPDLOG_NOEXCEPT noexcept
+#define SPDLOG_CONSTEXPR constexpr
+#endif
+
+// final keyword support. On by default. See tweakme.h
+#if defined(SPDLOG_NO_FINAL)
+#define SPDLOG_FINAL
+#else
+#define SPDLOG_FINAL final
+#endif
+
+#if defined(__GNUC__)  || defined(__clang__)
+#define SPDLOG_DEPRECATED __attribute__((deprecated))
+#elif defined(_MSC_VER)
+#define SPDLOG_DEPRECATED __declspec(deprecated)
+#else
+#define SPDLOG_DEPRECATED
+#endif
+
+#include "fmt/fmt.h"
+
+namespace spdlog
+{
+
+class formatter;
+
+namespace sinks
+{
+class sink;
+}
+
+using log_clock = std::chrono::system_clock;
+using sink_ptr = std::shared_ptr < sinks::sink >;
+using sinks_init_list = std::initializer_list < sink_ptr >;
+using formatter_ptr = std::shared_ptr<spdlog::formatter>;
+#if defined(SPDLOG_NO_ATOMIC_LEVELS)
+using level_t = details::null_atomic_int;
+#else
+using level_t = std::atomic<int>;
+#endif
+
+using log_err_handler = std::function<void(const std::string &err_msg)>;
+
+//Log level enum
+namespace level
+{
+typedef enum
+{
+    trace = 0,
+    debug = 1,
+    info = 2,
+    warn = 3,
+    err = 4,
+    critical = 5,
+    off = 6
+} level_enum;
+
+#if !defined(SPDLOG_LEVEL_NAMES)
+#define SPDLOG_LEVEL_NAMES { "trace", "debug", "info",  "warning", "error", "critical", "off" }
+#endif
+static const char* level_names[] SPDLOG_LEVEL_NAMES;
+
+static const char* short_level_names[] { "T", "D", "I", "W", "E", "C", "O" };
+
+inline const char* to_str(spdlog::level::level_enum l)
+{
+    return level_names[l];
+}
+
+inline const char* to_short_str(spdlog::level::level_enum l)
+{
+    return short_level_names[l];
+}
+} //level
+
+
+//
+// Async overflow policy - block by default.
+//
+enum class async_overflow_policy
+{
+    block_retry, // Block / yield / sleep until message can be enqueued
+    discard_log_msg // Discard the message it enqueue fails
+};
+
+//
+// Pattern time - specific time getting to use for pattern_formatter.
+// local time by default
+//
+enum class pattern_time_type
+{
+    local, // log localtime
+    utc    // log utc
+};
+
+//
+// Log exception
+//
+namespace details
+{
+namespace os
+{
+std::string errno_str(int err_num);
+}
+}
+class spdlog_ex: public std::exception
+{
+public:
+    spdlog_ex(const std::string& msg):_msg(msg)
+    {}
+    spdlog_ex(const std::string& msg, int last_errno)
+    {
+        _msg = msg + ": " + details::os::errno_str(last_errno);
+    }
+    const char* what() const SPDLOG_NOEXCEPT override
+    {
+        return _msg.c_str();
+    }
+private:
+    std::string _msg;
+
+};
+
+//
+// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
+//
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+using filename_t = std::wstring;
+#else
+using filename_t = std::string;
+#endif
+
+
+} //spdlog
diff --git a/3d_party/spd_log/include/spdlog/details/async_log_helper.h b/3d_party/spd_log/include/spdlog/details/async_log_helper.h
new file mode 100644
index 000000000..bba9bc0eb
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/async_log_helper.h
@@ -0,0 +1,398 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+// async log helper :
+// Process logs asynchronously using a back thread.
+//
+// If the internal queue of log messages reaches its max size,
+// then the client call will block until there is more room.
+//
+
+#pragma once
+
+#include "../common.h"
+#include "../sinks/sink.h"
+#include "../details/mpmc_bounded_q.h"
+#include "../details/log_msg.h"
+#include "../details/os.h"
+#include "../formatter.h"
+
+#include <chrono>
+#include <exception>
+#include <functional>
+#include <memory>
+#include <string>
+#include <thread>
+#include <utility>
+#include <vector>
+
+namespace spdlog
+{
+namespace details
+{
+
+class async_log_helper
+{
+    // Async msg to move to/from the queue
+    // Movable only. should never be copied
+    enum class async_msg_type
+    {
+        log,
+        flush,
+        terminate
+    };
+    struct async_msg
+    {
+        std::string logger_name;
+        level::level_enum level;
+        log_clock::time_point time;
+        size_t thread_id;
+        std::string txt;
+        async_msg_type msg_type;
+        size_t msg_id;
+
+        async_msg() = default;
+        ~async_msg() = default;
+
+
+async_msg(async_msg&& other) SPDLOG_NOEXCEPT:
+        logger_name(std::move(other.logger_name)),
+                    level(std::move(other.level)),
+                    time(std::move(other.time)),
+                    thread_id(other.thread_id),
+                    txt(std::move(other.txt)),
+                    msg_type(std::move(other.msg_type)),
+                    msg_id(other.msg_id)
+        {}
+
+        async_msg(async_msg_type m_type):
+            level(level::info),
+            thread_id(0),
+            msg_type(m_type),
+            msg_id(0)
+        {}
+
+        async_msg& operator=(async_msg&& other) SPDLOG_NOEXCEPT
+        {
+            logger_name = std::move(other.logger_name);
+            level = other.level;
+            time = std::move(other.time);
+            thread_id = other.thread_id;
+            txt = std::move(other.txt);
+            msg_type = other.msg_type;
+            msg_id = other.msg_id;
+            return *this;
+        }
+
+        // never copy or assign. should only be moved..
+        async_msg(const async_msg&) = delete;
+        async_msg& operator=(const async_msg& other) = delete;
+
+        // construct from log_msg
+        async_msg(const details::log_msg& m):
+            level(m.level),
+            time(m.time),
+            thread_id(m.thread_id),
+            txt(m.raw.data(), m.raw.size()),
+            msg_type(async_msg_type::log),
+            msg_id(m.msg_id)
+        {
+#ifndef SPDLOG_NO_NAME
+            logger_name = *m.logger_name;
+#endif
+        }
+
+
+        // copy into log_msg
+        void fill_log_msg(log_msg &msg)
+        {
+            msg.logger_name = &logger_name;
+            msg.level = level;
+            msg.time = time;
+            msg.thread_id = thread_id;
+            msg.raw << txt;
+            msg.msg_id = msg_id;
+        }
+    };
+
+public:
+
+    using item_type = async_msg;
+    using q_type = details::mpmc_bounded_queue<item_type>;
+
+    using clock = std::chrono::steady_clock;
+
+
+    async_log_helper(formatter_ptr formatter,
+                     const std::vector<sink_ptr>& sinks,
+                     size_t queue_size,
+                     const log_err_handler err_handler,
+                     const async_overflow_policy overflow_policy = async_overflow_policy::block_retry,
+                     const std::function<void()>& worker_warmup_cb = nullptr,
+                     const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(),
+                     const std::function<void()>& worker_teardown_cb = nullptr);
+
+    void log(const details::log_msg& msg);
+
+    // stop logging and join the back thread
+    ~async_log_helper();
+
+    void set_formatter(formatter_ptr);
+
+    void flush(bool wait_for_q);
+
+    void set_error_handler(spdlog::log_err_handler err_handler);
+
+private:
+    formatter_ptr _formatter;
+    std::vector<std::shared_ptr<sinks::sink>> _sinks;
+
+    // queue of messages to log
+    q_type _q;
+
+    log_err_handler _err_handler;
+
+    bool _flush_requested;
+
+    bool _terminate_requested;
+
+
+    // overflow policy
+    const async_overflow_policy _overflow_policy;
+
+    // worker thread warmup callback - one can set thread priority, affinity, etc
+    const std::function<void()> _worker_warmup_cb;
+
+    // auto periodic sink flush parameter
+    const std::chrono::milliseconds _flush_interval_ms;
+
+    // worker thread teardown callback
+    const std::function<void()> _worker_teardown_cb;
+
+    // worker thread
+    std::thread _worker_thread;
+
+    void push_msg(async_msg&& new_msg);
+
+    // worker thread main loop
+    void worker_loop();
+
+    // pop next message from the queue and process it. will set the last_pop to the pop time
+    // return false if termination of the queue is required
+    bool process_next_msg(log_clock::time_point& last_pop, log_clock::time_point& last_flush);
+
+    void handle_flush_interval(log_clock::time_point& now, log_clock::time_point& last_flush);
+
+    // sleep,yield or return immediately using the time passed since last message as a hint
+    static void sleep_or_yield(const spdlog::log_clock::time_point& now, const log_clock::time_point& last_op_time);
+
+    // wait until the queue is empty
+    void wait_empty_q();
+
+};
+}
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// async_sink class implementation
+///////////////////////////////////////////////////////////////////////////////
+inline spdlog::details::async_log_helper::async_log_helper(
+    formatter_ptr formatter,
+    const std::vector<sink_ptr>& sinks,
+    size_t queue_size,
+    log_err_handler err_handler,
+    const async_overflow_policy overflow_policy,
+    const std::function<void()>& worker_warmup_cb,
+    const std::chrono::milliseconds& flush_interval_ms,
+    const std::function<void()>& worker_teardown_cb):
+    _formatter(formatter),
+    _sinks(sinks),
+    _q(queue_size),
+    _err_handler(err_handler),
+    _flush_requested(false),
+    _terminate_requested(false),
+    _overflow_policy(overflow_policy),
+    _worker_warmup_cb(worker_warmup_cb),
+    _flush_interval_ms(flush_interval_ms),
+    _worker_teardown_cb(worker_teardown_cb),
+    _worker_thread(&async_log_helper::worker_loop, this)
+{}
+
+// Send to the worker thread termination message(level=off)
+// and wait for it to finish gracefully
+inline spdlog::details::async_log_helper::~async_log_helper()
+{
+    try
+    {
+        push_msg(async_msg(async_msg_type::terminate));
+        _worker_thread.join();
+    }
+    catch (...) // don't crash in destructor
+    {
+    }
+}
+
+
+//Try to push and block until succeeded (if the policy is not to discard when the queue is full)
+inline void spdlog::details::async_log_helper::log(const details::log_msg& msg)
+{
+    push_msg(async_msg(msg));
+}
+
+inline void spdlog::details::async_log_helper::push_msg(details::async_log_helper::async_msg&& new_msg)
+{
+    if (!_q.enqueue(std::move(new_msg)) && _overflow_policy != async_overflow_policy::discard_log_msg)
+    {
+        auto last_op_time = details::os::now();
+        auto now = last_op_time;
+        do
+        {
+            now = details::os::now();
+            sleep_or_yield(now, last_op_time);
+        }
+        while (!_q.enqueue(std::move(new_msg)));
+    }
+}
+
+// optionally wait for the queue be empty and request flush from the sinks
+inline void spdlog::details::async_log_helper::flush(bool wait_for_q)
+{
+    push_msg(async_msg(async_msg_type::flush));
+    if (wait_for_q)
+        wait_empty_q(); //return when queue is empty
+}
+
+inline void spdlog::details::async_log_helper::worker_loop()
+{
+    if (_worker_warmup_cb) _worker_warmup_cb();
+    auto last_pop = details::os::now();
+    auto last_flush = last_pop;
+    auto active = true;
+    while (active)
+    {
+        try
+        {
+            active = process_next_msg(last_pop, last_flush);
+        }
+        catch (const std::exception &ex)
+        {
+            _err_handler(ex.what());
+        }
+        catch(...)
+        {
+            _err_handler("Unknown exeption in async logger worker loop.");
+        }
+    }
+    if (_worker_teardown_cb) _worker_teardown_cb();
+
+
+}
+
+// process next message in the queue
+// return true if this thread should still be active (while no terminate msg was received)
+inline bool spdlog::details::async_log_helper::process_next_msg(log_clock::time_point& last_pop, log_clock::time_point& last_flush)
+{
+    async_msg incoming_async_msg;
+
+    if (_q.dequeue(incoming_async_msg))
+    {
+        last_pop = details::os::now();
+        switch (incoming_async_msg.msg_type)
+        {
+        case async_msg_type::flush:
+            _flush_requested = true;
+            break;
+
+        case async_msg_type::terminate:
+            _flush_requested = true;
+            _terminate_requested = true;
+            break;
+
+        default:
+            log_msg incoming_log_msg;
+            incoming_async_msg.fill_log_msg(incoming_log_msg);
+            _formatter->format(incoming_log_msg);
+            for (auto &s : _sinks)
+            {
+                if (s->should_log(incoming_log_msg.level))
+                {
+                    s->log(incoming_log_msg);
+                }
+            }
+        }
+        return true;
+    }
+
+    // Handle empty queue..
+    // This is the only place where the queue can terminate or flush to avoid losing messages already in the queue
+    else
+    {
+        auto now = details::os::now();
+        handle_flush_interval(now, last_flush);
+        sleep_or_yield(now, last_pop);
+        return !_terminate_requested;
+    }
+}
+
+// flush all sinks if _flush_interval_ms has expired
+inline void spdlog::details::async_log_helper::handle_flush_interval(log_clock::time_point& now, log_clock::time_point& last_flush)
+{
+    auto should_flush = _flush_requested || (_flush_interval_ms != std::chrono::milliseconds::zero() && now - last_flush >= _flush_interval_ms);
+    if (should_flush)
+    {
+        for (auto &s : _sinks)
+            s->flush();
+        now = last_flush = details::os::now();
+        _flush_requested = false;
+    }
+}
+
+inline void spdlog::details::async_log_helper::set_formatter(formatter_ptr msg_formatter)
+{
+    _formatter = msg_formatter;
+}
+
+
+// spin, yield or sleep. use the time passed since last message as a hint
+inline void spdlog::details::async_log_helper::sleep_or_yield(const spdlog::log_clock::time_point& now, const spdlog::log_clock::time_point& last_op_time)
+{
+    using std::chrono::milliseconds;
+    using std::chrono::microseconds;
+
+    auto time_since_op = now - last_op_time;
+
+    // spin upto 50 micros
+    if (time_since_op <= microseconds(50))
+        return;
+
+    // yield upto 150 micros
+    if (time_since_op <= microseconds(100))
+        return std::this_thread::yield();
+
+    // sleep for 20 ms upto 200 ms
+    if (time_since_op <= milliseconds(200))
+        return details::os::sleep_for_millis(20);
+
+    // sleep for 500 ms
+    return details::os::sleep_for_millis(500);
+}
+
+// wait for the queue to be empty
+inline void spdlog::details::async_log_helper::wait_empty_q()
+{
+    auto last_op = details::os::now();
+    while (!_q.is_empty())
+    {
+        sleep_or_yield(details::os::now(), last_op);
+    }
+}
+
+inline void spdlog::details::async_log_helper::set_error_handler(spdlog::log_err_handler err_handler)
+{
+    _err_handler = err_handler;
+}
+
+
+
diff --git a/3d_party/spd_log/include/spdlog/details/async_logger_impl.h b/3d_party/spd_log/include/spdlog/details/async_logger_impl.h
new file mode 100644
index 000000000..837321176
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/async_logger_impl.h
@@ -0,0 +1,107 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Async Logger implementation
+// Use an async_sink (queue per logger) to perform the logging in a worker thread
+
+#include "../details/async_log_helper.h"
+#include "../async_logger.h"
+
+#include <string>
+#include <functional>
+#include <chrono>
+#include <memory>
+
+template<class It>
+inline spdlog::async_logger::async_logger(const std::string& logger_name,
+        const It& begin,
+        const It& end,
+        size_t queue_size,
+        const  async_overflow_policy overflow_policy,
+        const std::function<void()>& worker_warmup_cb,
+        const std::chrono::milliseconds& flush_interval_ms,
+        const std::function<void()>& worker_teardown_cb) :
+    logger(logger_name, begin, end),
+    _async_log_helper(new details::async_log_helper(_formatter, _sinks, queue_size, _err_handler, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb))
+{
+}
+
+inline spdlog::async_logger::async_logger(const std::string& logger_name,
+        sinks_init_list sinks_list,
+        size_t queue_size,
+        const  async_overflow_policy overflow_policy,
+        const std::function<void()>& worker_warmup_cb,
+        const std::chrono::milliseconds& flush_interval_ms,
+        const std::function<void()>& worker_teardown_cb) :
+    async_logger(logger_name, sinks_list.begin(), sinks_list.end(), queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb) {}
+
+inline spdlog::async_logger::async_logger(const std::string& logger_name,
+        sink_ptr single_sink,
+        size_t queue_size,
+        const  async_overflow_policy overflow_policy,
+        const std::function<void()>& worker_warmup_cb,
+        const std::chrono::milliseconds& flush_interval_ms,
+        const std::function<void()>& worker_teardown_cb) :
+    async_logger(logger_name,
+{
+    single_sink
+}, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb) {}
+
+
+inline void spdlog::async_logger::flush()
+{
+    _async_log_helper->flush(true);
+}
+
+// Error handler
+inline void spdlog::async_logger::set_error_handler(spdlog::log_err_handler err_handler)
+{
+    _err_handler = err_handler;
+    _async_log_helper->set_error_handler(err_handler);
+
+}
+inline spdlog::log_err_handler spdlog::async_logger::error_handler()
+{
+    return _err_handler;
+}
+
+
+inline void spdlog::async_logger::_set_formatter(spdlog::formatter_ptr msg_formatter)
+{
+    _formatter = msg_formatter;
+    _async_log_helper->set_formatter(_formatter);
+}
+
+inline void spdlog::async_logger::_set_pattern(const std::string& pattern, pattern_time_type pattern_time)
+{
+    _formatter = std::make_shared<pattern_formatter>(pattern, pattern_time);
+    _async_log_helper->set_formatter(_formatter);
+}
+
+
+inline void spdlog::async_logger::_sink_it(details::log_msg& msg)
+{
+    try
+    {
+#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
+        _incr_msg_counter(msg);
+#endif
+        _async_log_helper->log(msg);
+        if (_should_flush_on(msg))
+            _async_log_helper->flush(false); // do async flush
+    }
+    catch (const std::exception &ex)
+    {
+        _err_handler(ex.what());
+    }
+    catch(...)
+    {
+        _err_handler("Unknown exception in logger " + _name);
+        throw;
+    }
+
+}
diff --git a/3d_party/spd_log/include/spdlog/details/file_helper.h b/3d_party/spd_log/include/spdlog/details/file_helper.h
new file mode 100644
index 000000000..dff788ffc
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/file_helper.h
@@ -0,0 +1,145 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Helper class for file sink
+// When failing to open a file, retry several times(5) with small delay between the tries(10 ms)
+// Throw spdlog_ex exception on errors
+
+#include "../details/os.h"
+#include "../details/log_msg.h"
+
+#include <chrono>
+#include <cstdio>
+#include <string>
+#include <thread>
+#include <tuple>
+#include <cerrno>
+
+namespace spdlog
+{
+namespace details
+{
+
+class file_helper
+{
+
+public:
+    const int open_tries = 5;
+    const int open_interval = 10;
+
+    explicit file_helper() :
+        _fd(nullptr)
+    {}
+
+    file_helper(const file_helper&) = delete;
+    file_helper& operator=(const file_helper&) = delete;
+
+    ~file_helper()
+    {
+        close();
+    }
+
+
+    void open(const filename_t& fname, bool truncate = false)
+    {
+
+        close();
+        auto *mode = truncate ? SPDLOG_FILENAME_T("wb") : SPDLOG_FILENAME_T("ab");
+        _filename = fname;
+        for (int tries = 0; tries < open_tries; ++tries)
+        {
+            if (!os::fopen_s(&_fd, fname, mode))
+                return;
+
+            details::os::sleep_for_millis(open_interval);
+        }
+
+        throw spdlog_ex("Failed opening file " + os::filename_to_str(_filename) + " for writing", errno);
+    }
+
+    void reopen(bool truncate)
+    {
+        if (_filename.empty())
+            throw spdlog_ex("Failed re opening file - was not opened before");
+        open(_filename, truncate);
+
+    }
+
+    void flush()
+    {
+        std::fflush(_fd);
+    }
+
+    void close()
+    {
+        if (_fd)
+        {
+            std::fclose(_fd);
+            _fd = nullptr;
+        }
+    }
+
+    void write(const log_msg& msg)
+    {
+        size_t msg_size = msg.formatted.size();
+        auto data = msg.formatted.data();
+        if (std::fwrite(data, 1, msg_size, _fd) != msg_size)
+            throw spdlog_ex("Failed writing to file " + os::filename_to_str(_filename), errno);
+    }
+
+    size_t size() const
+    {
+        if (!_fd)
+            throw spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(_filename));
+        return os::filesize(_fd);
+    }
+
+    const filename_t& filename() const
+    {
+        return _filename;
+    }
+
+    static bool file_exists(const filename_t& fname)
+    {
+        return os::file_exists(fname);
+    }
+
+    //
+    // return file path and its extension:
+    //
+    // "mylog.txt" => ("mylog", ".txt")
+    // "mylog" => ("mylog", "")
+    // "mylog." => ("mylog.", "")
+    // "/dir1/dir2/mylog.txt" => ("/dir1/dir2/mylog", ".txt")
+    //
+    // the starting dot in filenames is ignored (hidden files):
+    //
+    // ".mylog" => (".mylog". "")
+    // "my_folder/.mylog" => ("my_folder/.mylog", "")
+    // "my_folder/.mylog.txt" => ("my_folder/.mylog", ".txt")
+    static std::tuple<filename_t, filename_t> split_by_extenstion(const spdlog::filename_t& fname)
+    {
+        auto ext_index = fname.rfind('.');
+
+        // no valid extension found - return whole path and empty string as extension
+        if (ext_index == filename_t::npos || ext_index == 0 || ext_index == fname.size() - 1)
+            return std::make_tuple(fname, spdlog::filename_t());
+
+        // treat casese like "/etc/rc.d/somelogfile or "/abc/.hiddenfile"
+        auto folder_index = fname.rfind(details::os::folder_sep);
+        if (folder_index != fname.npos && folder_index >= ext_index - 1)
+            return std::make_tuple(fname, spdlog::filename_t());
+
+        // finally - return a valid base and extension tuple
+        return std::make_tuple(fname.substr(0, ext_index), fname.substr(ext_index));
+    }
+private:
+    FILE* _fd;
+    filename_t _filename;
+};
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/details/log_msg.h b/3d_party/spd_log/include/spdlog/details/log_msg.h
new file mode 100644
index 000000000..a9fe92011
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/log_msg.h
@@ -0,0 +1,50 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "../common.h"
+#include "../details/os.h"
+
+
+#include <string>
+#include <utility>
+
+namespace spdlog
+{
+namespace details
+{
+struct log_msg
+{
+    log_msg() = default;
+    log_msg(const std::string *loggers_name, level::level_enum lvl) :
+        logger_name(loggers_name),
+        level(lvl),
+        msg_id(0)
+    {
+#ifndef SPDLOG_NO_DATETIME
+        time = os::now();
+#endif
+
+#ifndef SPDLOG_NO_THREAD_ID
+        thread_id = os::thread_id();
+#endif
+    }
+
+    log_msg(const log_msg& other)  = delete;
+    log_msg& operator=(log_msg&& other) = delete;
+    log_msg(log_msg&& other) = delete;
+
+
+    const std::string *logger_name;
+    level::level_enum level;
+    log_clock::time_point time;
+    size_t thread_id;
+    fmt::MemoryWriter raw;
+    fmt::MemoryWriter formatted;
+    size_t msg_id;
+};
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/details/logger_impl.h b/3d_party/spd_log/include/spdlog/details/logger_impl.h
new file mode 100644
index 000000000..880447471
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/logger_impl.h
@@ -0,0 +1,373 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "../logger.h"
+#include "../sinks/stdout_sinks.h"
+
+#include <memory>
+#include <string>
+
+// create logger with given name, sinks and the default pattern formatter
+// all other ctors will call this one
+template<class It>
+inline spdlog::logger::logger(const std::string& logger_name, const It& begin, const It& end):
+    _name(logger_name),
+    _sinks(begin, end),
+    _formatter(std::make_shared<pattern_formatter>("%+")),
+    _level(level::info),
+    _flush_level(level::off),
+    _last_err_time(0),
+    _msg_counter(1)  // message counter will start from 1. 0-message id will be reserved for controll messages
+{
+    _err_handler = [this](const std::string &msg)
+    {
+        this->_default_err_handler(msg);
+    };
+}
+
+// ctor with sinks as init list
+inline spdlog::logger::logger(const std::string& logger_name, sinks_init_list sinks_list):
+    logger(logger_name, sinks_list.begin(), sinks_list.end())
+{}
+
+
+// ctor with single sink
+inline spdlog::logger::logger(const std::string& logger_name, spdlog::sink_ptr single_sink):
+    logger(logger_name,
+{
+    single_sink
+})
+{}
+
+
+inline spdlog::logger::~logger() = default;
+
+
+inline void spdlog::logger::set_formatter(spdlog::formatter_ptr msg_formatter)
+{
+    _set_formatter(msg_formatter);
+}
+
+inline void spdlog::logger::set_pattern(const std::string& pattern, pattern_time_type pattern_time)
+{
+    _set_pattern(pattern, pattern_time);
+}
+
+template <typename... Args>
+inline void spdlog::logger::log(level::level_enum lvl, const char* fmt, const Args&... args)
+{
+    if (!should_log(lvl)) return;
+
+    try
+    {
+        details::log_msg log_msg(&_name, lvl);
+
+#if defined(SPDLOG_FMT_PRINTF)
+        fmt::printf(log_msg.raw, fmt, args...);
+#else
+        log_msg.raw.write(fmt, args...);
+#endif
+        _sink_it(log_msg);
+    }
+    catch (const std::exception &ex)
+    {
+        _err_handler(ex.what());
+    }
+    catch(...)
+    {
+        _err_handler("Unknown exception in logger " + _name);
+        throw;
+    }
+}
+
+template <typename... Args>
+inline void spdlog::logger::log(level::level_enum lvl, const char* msg)
+{
+    if (!should_log(lvl)) return;
+    try
+    {
+        details::log_msg log_msg(&_name, lvl);
+        log_msg.raw << msg;
+        _sink_it(log_msg);
+    }
+    catch (const std::exception &ex)
+    {
+        _err_handler(ex.what());
+    }
+    catch (...)
+    {
+        _err_handler("Unknown exception in logger " + _name);
+        throw;
+    }
+}
+
+template<typename T>
+inline void spdlog::logger::log(level::level_enum lvl, const T& msg)
+{
+    if (!should_log(lvl)) return;
+    try
+    {
+        details::log_msg log_msg(&_name, lvl);
+        log_msg.raw << msg;
+        _sink_it(log_msg);
+    }
+    catch (const std::exception &ex)
+    {
+        _err_handler(ex.what());
+    }
+    catch (...)
+    {
+        _err_handler("Unknown exception in logger " + _name);
+        throw;
+    }
+}
+
+
+template <typename Arg1, typename... Args>
+inline void spdlog::logger::trace(const char* fmt, const Arg1 &arg1, const Args&... args)
+{
+    log(level::trace, fmt, arg1, args...);
+}
+
+template <typename Arg1, typename... Args>
+inline void spdlog::logger::debug(const char* fmt, const Arg1 &arg1, const Args&... args)
+{
+    log(level::debug, fmt, arg1, args...);
+}
+
+template <typename Arg1, typename... Args>
+inline void spdlog::logger::info(const char* fmt, const Arg1 &arg1, const Args&... args)
+{
+    log(level::info, fmt, arg1, args...);
+}
+
+template <typename Arg1, typename... Args>
+inline void spdlog::logger::warn(const char* fmt, const Arg1 &arg1, const Args&... args)
+{
+    log(level::warn, fmt, arg1, args...);
+}
+
+template <typename Arg1, typename... Args>
+inline void spdlog::logger::error(const char* fmt, const Arg1 &arg1, const Args&... args)
+{
+    log(level::err, fmt, arg1, args...);
+}
+
+template <typename Arg1, typename... Args>
+inline void spdlog::logger::critical(const char* fmt, const Arg1 &arg1, const Args&... args)
+{
+    log(level::critical, fmt, arg1, args...);
+}
+
+
+template<typename T>
+inline void spdlog::logger::trace(const T& msg)
+{
+    log(level::trace, msg);
+}
+
+template<typename T>
+inline void spdlog::logger::debug(const T& msg)
+{
+    log(level::debug, msg);
+}
+
+
+template<typename T>
+inline void spdlog::logger::info(const T& msg)
+{
+    log(level::info, msg);
+}
+
+
+template<typename T>
+inline void spdlog::logger::warn(const T& msg)
+{
+    log(level::warn, msg);
+}
+
+template<typename T>
+inline void spdlog::logger::error(const T& msg)
+{
+    log(level::err, msg);
+}
+
+template<typename T>
+inline void spdlog::logger::critical(const T& msg)
+{
+    log(level::critical, msg);
+}
+
+
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+#include <codecvt>
+#include <locale>
+
+template <typename... Args>
+inline void spdlog::logger::log(level::level_enum lvl, const wchar_t* msg)
+{
+    std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;
+
+    log(lvl, conv.to_bytes(msg));
+}
+
+template <typename... Args>
+inline void spdlog::logger::log(level::level_enum lvl, const wchar_t* fmt, const Args&... args)
+{
+    fmt::WMemoryWriter wWriter;
+
+    wWriter.write(fmt, args...);
+    log(lvl, wWriter.c_str());
+}
+
+template <typename... Args>
+inline void spdlog::logger::trace(const wchar_t* fmt, const Args&... args)
+{
+    log(level::trace, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::debug(const wchar_t* fmt, const Args&... args)
+{
+    log(level::debug, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::info(const wchar_t* fmt, const Args&... args)
+{
+    log(level::info, fmt, args...);
+}
+
+
+template <typename... Args>
+inline void spdlog::logger::warn(const wchar_t* fmt, const Args&... args)
+{
+    log(level::warn, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::error(const wchar_t* fmt, const Args&... args)
+{
+    log(level::err, fmt, args...);
+}
+
+template <typename... Args>
+inline void spdlog::logger::critical(const wchar_t* fmt, const Args&... args)
+{
+    log(level::critical, fmt, args...);
+}
+
+#endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT
+
+
+
+//
+// name and level
+//
+inline const std::string& spdlog::logger::name() const
+{
+    return _name;
+}
+
+inline void spdlog::logger::set_level(spdlog::level::level_enum log_level)
+{
+    _level.store(log_level);
+}
+
+inline void spdlog::logger::set_error_handler(spdlog::log_err_handler err_handler)
+{
+    _err_handler = err_handler;
+}
+
+inline spdlog::log_err_handler spdlog::logger::error_handler()
+{
+    return _err_handler;
+}
+
+
+inline void spdlog::logger::flush_on(level::level_enum log_level)
+{
+    _flush_level.store(log_level);
+}
+
+inline spdlog::level::level_enum spdlog::logger::level() const
+{
+    return static_cast<spdlog::level::level_enum>(_level.load(std::memory_order_relaxed));
+}
+
+inline bool spdlog::logger::should_log(spdlog::level::level_enum msg_level) const
+{
+    return msg_level >= _level.load(std::memory_order_relaxed);
+}
+
+//
+// protected virtual called at end of each user log call (if enabled) by the line_logger
+//
+inline void spdlog::logger::_sink_it(details::log_msg& msg)
+{
+#if defined(SPDLOG_ENABLE_MESSAGE_COUNTER)
+    _incr_msg_counter(msg);
+#endif
+    _formatter->format(msg);
+    for (auto &sink : _sinks)
+    {
+        if( sink->should_log( msg.level))
+        {
+            sink->log(msg);
+        }
+    }
+
+    if(_should_flush_on(msg))
+        flush();
+}
+
+inline void spdlog::logger::_set_pattern(const std::string& pattern, pattern_time_type pattern_time)
+{
+    _formatter = std::make_shared<pattern_formatter>(pattern, pattern_time);
+}
+inline void spdlog::logger::_set_formatter(formatter_ptr msg_formatter)
+{
+    _formatter = msg_formatter;
+}
+
+inline void spdlog::logger::flush()
+{
+    for (auto& sink : _sinks)
+        sink->flush();
+}
+
+inline void spdlog::logger::_default_err_handler(const std::string &msg)
+{
+    auto now = time(nullptr);
+    if (now - _last_err_time < 60)
+        return;
+    auto tm_time = details::os::localtime(now);
+    char date_buf[100];
+    std::strftime(date_buf, sizeof(date_buf), "%Y-%m-%d %H:%M:%S", &tm_time);
+    details::log_msg  err_msg;
+    err_msg.formatted.write("[*** LOG ERROR ***] [{}] [{}] [{}]{}", name(), msg, date_buf, details::os::eol);
+    sinks::stderr_sink_mt::instance()->log(err_msg);
+    _last_err_time = now;
+}
+
+inline bool spdlog::logger::_should_flush_on(const details::log_msg &msg)
+{
+    const auto flush_level = _flush_level.load(std::memory_order_relaxed);
+    return (msg.level >= flush_level) && (msg.level != level::off);
+}
+
+inline void spdlog::logger::_incr_msg_counter(details::log_msg &msg)
+{
+    msg.msg_id = _msg_counter.fetch_add(1, std::memory_order_relaxed);
+}
+
+inline const std::vector<spdlog::sink_ptr>& spdlog::logger::sinks() const
+{
+    return _sinks;
+}
+
diff --git a/3d_party/spd_log/include/spdlog/details/mpmc_bounded_q.h b/3d_party/spd_log/include/spdlog/details/mpmc_bounded_q.h
new file mode 100644
index 000000000..102df8555
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/mpmc_bounded_q.h
@@ -0,0 +1,176 @@
+/*
+A modified version of Bounded MPMC queue by Dmitry Vyukov.
+
+Original code from:
+http://www.1024cores.net/home/lock-free-algorithms/queues/bounded-mpmc-queue
+
+licensed by Dmitry Vyukov under the terms below:
+
+Simplified BSD license
+
+Copyright (c) 2010-2011 Dmitry Vyukov. All rights reserved.
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+1. Redistributions of source code must retain the above copyright notice, this list of
+conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list
+of conditions and the following disclaimer in the documentation and/or other materials
+provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY DMITRY VYUKOV "AS IS" AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+SHALL DMITRY VYUKOV OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are those of the authors and
+should not be interpreted as representing official policies, either expressed or implied, of Dmitry Vyukov.
+*/
+
+/*
+The code in its current form adds the license below:
+
+Copyright(c) 2015 Gabi Melman.
+Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+*/
+
+#pragma once
+
+#include "../common.h"
+
+#include <atomic>
+#include <utility>
+
+namespace spdlog
+{
+namespace details
+{
+
+template<typename T>
+class mpmc_bounded_queue
+{
+public:
+
+    using item_type = T;
+    mpmc_bounded_queue(size_t buffer_size)
+        :max_size_(buffer_size),
+         buffer_(new cell_t[buffer_size]),
+         buffer_mask_(buffer_size - 1)
+    {
+        //queue size must be power of two
+        if (!((buffer_size >= 2) && ((buffer_size & (buffer_size - 1)) == 0)))
+            throw spdlog_ex("async logger queue size must be power of two");
+
+        for (size_t i = 0; i != buffer_size; i += 1)
+            buffer_[i].sequence_.store(i, std::memory_order_relaxed);
+        enqueue_pos_.store(0, std::memory_order_relaxed);
+        dequeue_pos_.store(0, std::memory_order_relaxed);
+    }
+
+    ~mpmc_bounded_queue()
+    {
+        delete[] buffer_;
+    }
+
+
+    bool enqueue(T&& data)
+    {
+        cell_t* cell;
+        size_t pos = enqueue_pos_.load(std::memory_order_relaxed);
+        for (;;)
+        {
+            cell = &buffer_[pos & buffer_mask_];
+            size_t seq = cell->sequence_.load(std::memory_order_acquire);
+            intptr_t dif = static_cast<intptr_t>(seq) - static_cast<intptr_t>(pos);
+            if (dif == 0)
+            {
+                if (enqueue_pos_.compare_exchange_weak(pos, pos + 1, std::memory_order_relaxed))
+                    break;
+            }
+            else if (dif < 0)
+            {
+                return false;
+            }
+            else
+            {
+                pos = enqueue_pos_.load(std::memory_order_relaxed);
+            }
+        }
+        cell->data_ = std::move(data);
+        cell->sequence_.store(pos + 1, std::memory_order_release);
+        return true;
+    }
+
+    bool dequeue(T& data)
+    {
+        cell_t* cell;
+        size_t pos = dequeue_pos_.load(std::memory_order_relaxed);
+        for (;;)
+        {
+            cell = &buffer_[pos & buffer_mask_];
+            size_t seq =
+                cell->sequence_.load(std::memory_order_acquire);
+            intptr_t dif = static_cast<intptr_t>(seq) - static_cast<intptr_t>(pos + 1);
+            if (dif == 0)
+            {
+                if (dequeue_pos_.compare_exchange_weak(pos, pos + 1, std::memory_order_relaxed))
+                    break;
+            }
+            else if (dif < 0)
+                return false;
+            else
+                pos = dequeue_pos_.load(std::memory_order_relaxed);
+        }
+        data = std::move(cell->data_);
+        cell->sequence_.store(pos + buffer_mask_ + 1, std::memory_order_release);
+        return true;
+    }
+
+    bool is_empty()
+    {
+        size_t front, front1, back;
+        // try to take a consistent snapshot of front/tail.
+        do
+        {
+            front = enqueue_pos_.load(std::memory_order_acquire);
+            back = dequeue_pos_.load(std::memory_order_acquire);
+            front1 = enqueue_pos_.load(std::memory_order_relaxed);
+        }
+        while (front != front1);
+        return back == front;
+    }
+
+private:
+    struct cell_t
+    {
+        std::atomic<size_t>   sequence_;
+        T                     data_;
+    };
+
+    size_t const max_size_;
+
+    static size_t const     cacheline_size = 64;
+    typedef char            cacheline_pad_t[cacheline_size];
+
+    cacheline_pad_t         pad0_;
+    cell_t* const           buffer_;
+    size_t const            buffer_mask_;
+    cacheline_pad_t         pad1_;
+    std::atomic<size_t>     enqueue_pos_;
+    cacheline_pad_t         pad2_;
+    std::atomic<size_t>     dequeue_pos_;
+    cacheline_pad_t         pad3_;
+
+    mpmc_bounded_queue(mpmc_bounded_queue const&) = delete;
+    void operator= (mpmc_bounded_queue const&) = delete;
+};
+
+} // ns details
+} // ns spdlog
diff --git a/3d_party/spd_log/include/spdlog/details/null_mutex.h b/3d_party/spd_log/include/spdlog/details/null_mutex.h
new file mode 100644
index 000000000..67b0aeee0
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/null_mutex.h
@@ -0,0 +1,45 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <atomic>
+// null, no cost dummy "mutex" and dummy "atomic" int
+
+namespace spdlog
+{
+namespace details
+{
+struct null_mutex
+{
+    void lock() {}
+    void unlock() {}
+    bool try_lock()
+    {
+        return true;
+    }
+};
+
+struct null_atomic_int
+{
+    int value;
+    null_atomic_int() = default;
+
+    null_atomic_int(int val):value(val)
+    {}
+
+    int load(std::memory_order) const
+    {
+        return value;
+    }
+
+    void store(int val)
+    {
+        value = val;
+    }
+};
+
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/details/os.h b/3d_party/spd_log/include/spdlog/details/os.h
new file mode 100644
index 000000000..b881cae45
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/os.h
@@ -0,0 +1,490 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+#pragma once
+
+#include "../common.h"
+
+#include <cstdio>
+#include <ctime>
+#include <functional>
+#include <string>
+#include <chrono>
+#include <thread>
+#include <algorithm>
+#include <cstring>
+#include <cstdlib>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#ifdef _WIN32
+
+#ifndef NOMINMAX
+#define NOMINMAX //prevent windows redefining min/max
+#endif
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <process.h> //  _get_pid support
+#include <io.h> // _get_osfhandle and _isatty support
+
+#ifdef __MINGW32__
+#include <share.h>
+#endif
+
+#else // unix
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#ifdef __linux__
+#include <sys/syscall.h> //Use gettid() syscall under linux to get thread id
+
+#elif __FreeBSD__
+#include <sys/thr.h> //Use thr_self() syscall under FreeBSD to get thread id
+#endif
+
+#endif //unix
+
+#ifndef __has_feature       // Clang - feature checking macros.
+#define __has_feature(x) 0  // Compatibility with non-clang compilers.
+#endif
+
+
+namespace spdlog
+{
+namespace details
+{
+namespace os
+{
+
+inline spdlog::log_clock::time_point now()
+{
+
+#if defined __linux__ && defined SPDLOG_CLOCK_COARSE
+    timespec ts;
+    ::clock_gettime(CLOCK_REALTIME_COARSE, &ts);
+    return std::chrono::time_point<log_clock, typename log_clock::duration>(
+               std::chrono::duration_cast<typename log_clock::duration>(
+                   std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec)));
+
+
+#else
+    return log_clock::now();
+#endif
+
+}
+inline std::tm localtime(const std::time_t &time_tt)
+{
+
+#ifdef _WIN32
+    std::tm tm;
+    localtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    localtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+inline std::tm localtime()
+{
+    std::time_t now_t = time(nullptr);
+    return localtime(now_t);
+}
+
+
+inline std::tm gmtime(const std::time_t &time_tt)
+{
+
+#ifdef _WIN32
+    std::tm tm;
+    gmtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    gmtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+inline std::tm gmtime()
+{
+    std::time_t now_t = time(nullptr);
+    return gmtime(now_t);
+}
+inline bool operator==(const std::tm& tm1, const std::tm& tm2)
+{
+    return (tm1.tm_sec == tm2.tm_sec &&
+            tm1.tm_min == tm2.tm_min &&
+            tm1.tm_hour == tm2.tm_hour &&
+            tm1.tm_mday == tm2.tm_mday &&
+            tm1.tm_mon == tm2.tm_mon &&
+            tm1.tm_year == tm2.tm_year &&
+            tm1.tm_isdst == tm2.tm_isdst);
+}
+
+inline bool operator!=(const std::tm& tm1, const std::tm& tm2)
+{
+    return !(tm1 == tm2);
+}
+
+// eol definition
+#if !defined (SPDLOG_EOL)
+#ifdef _WIN32
+#define SPDLOG_EOL "\r\n"
+#else
+#define SPDLOG_EOL "\n"
+#endif
+#endif
+
+SPDLOG_CONSTEXPR static const char* eol = SPDLOG_EOL;
+SPDLOG_CONSTEXPR static int eol_size = sizeof(SPDLOG_EOL) - 1;
+
+
+
+// folder separator
+#ifdef _WIN32
+SPDLOG_CONSTEXPR static const char folder_sep = '\\';
+#else
+SPDLOG_CONSTEXPR static const char folder_sep = '/';
+#endif
+
+
+inline void prevent_child_fd(FILE *f)
+{
+#ifdef _WIN32
+    auto file_handle = (HANDLE)_get_osfhandle(_fileno(f));
+    if (!::SetHandleInformation(file_handle, HANDLE_FLAG_INHERIT, 0))
+        throw spdlog_ex("SetHandleInformation failed", errno);
+#else
+    auto fd = fileno(f);
+    if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
+        throw spdlog_ex("fcntl with FD_CLOEXEC failed", errno);
+#endif
+}
+
+
+//fopen_s on non windows for writing
+inline int fopen_s(FILE** fp, const filename_t& filename, const filename_t& mode)
+{
+#ifdef _WIN32
+#ifdef SPDLOG_WCHAR_FILENAMES
+    *fp = _wfsopen((filename.c_str()), mode.c_str(), _SH_DENYWR);
+#else
+    *fp = _fsopen((filename.c_str()), mode.c_str(), _SH_DENYWR);
+#endif
+#else //unix
+    *fp = fopen((filename.c_str()), mode.c_str());
+#endif
+
+#ifdef SPDLOG_PREVENT_CHILD_FD
+    if (*fp != nullptr)
+        prevent_child_fd(*fp);
+#endif
+    return *fp == nullptr;
+}
+
+
+inline int remove(const filename_t &filename)
+{
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return _wremove(filename.c_str());
+#else
+    return std::remove(filename.c_str());
+#endif
+}
+
+inline int rename(const filename_t& filename1, const filename_t& filename2)
+{
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return _wrename(filename1.c_str(), filename2.c_str());
+#else
+    return std::rename(filename1.c_str(), filename2.c_str());
+#endif
+}
+
+
+//Return if file exists
+inline bool file_exists(const filename_t& filename)
+{
+#ifdef _WIN32
+#ifdef SPDLOG_WCHAR_FILENAMES
+    auto attribs = GetFileAttributesW(filename.c_str());
+#else
+    auto attribs = GetFileAttributesA(filename.c_str());
+#endif
+    return (attribs != INVALID_FILE_ATTRIBUTES && !(attribs & FILE_ATTRIBUTE_DIRECTORY));
+#else //common linux/unix all have the stat system call
+    struct stat buffer;
+    return (stat(filename.c_str(), &buffer) == 0);
+#endif
+}
+
+
+
+
+//Return file size according to open FILE* object
+inline size_t filesize(FILE *f)
+{
+    if (f == nullptr)
+        throw spdlog_ex("Failed getting file size. fd is null");
+#if defined ( _WIN32) && !defined(__CYGWIN__)
+    int fd = _fileno(f);
+#if _WIN64 //64 bits
+    struct _stat64 st;
+    if (_fstat64(fd, &st) == 0)
+        return st.st_size;
+
+#else //windows 32 bits
+    long ret = _filelength(fd);
+    if (ret >= 0)
+        return static_cast<size_t>(ret);
+#endif
+
+#else // unix
+    int fd = fileno(f);
+    //64 bits(but not in osx or cygwin, where fstat64 is deprecated)
+#if !defined(__FreeBSD__) && !defined(__APPLE__) && (defined(__x86_64__) || defined(__ppc64__)) && !defined(__CYGWIN__)
+    struct stat64 st;
+    if (fstat64(fd, &st) == 0)
+        return static_cast<size_t>(st.st_size);
+#else // unix 32 bits or cygwin
+    struct stat st;
+    if (fstat(fd, &st) == 0)
+        return static_cast<size_t>(st.st_size);
+#endif
+#endif
+    throw spdlog_ex("Failed getting file size from fd", errno);
+}
+
+
+
+
+//Return utc offset in minutes or throw spdlog_ex on failure
+inline int utc_minutes_offset(const std::tm& tm = details::os::localtime())
+{
+
+#ifdef _WIN32
+#if _WIN32_WINNT < _WIN32_WINNT_WS08
+    TIME_ZONE_INFORMATION tzinfo;
+    auto rv = GetTimeZoneInformation(&tzinfo);
+#else
+    DYNAMIC_TIME_ZONE_INFORMATION tzinfo;
+    auto rv = GetDynamicTimeZoneInformation(&tzinfo);
+#endif
+    if (rv == TIME_ZONE_ID_INVALID)
+        throw spdlog::spdlog_ex("Failed getting timezone info. ", errno);
+
+    int offset = -tzinfo.Bias;
+    if (tm.tm_isdst)
+        offset -= tzinfo.DaylightBias;
+    else
+        offset -= tzinfo.StandardBias;
+    return offset;
+#else
+
+#if defined(sun) || defined(__sun)
+    // 'tm_gmtoff' field is BSD extension and it's missing on SunOS/Solaris
+    struct helper
+    {
+        static long int calculate_gmt_offset(const std::tm & localtm = details::os::localtime(), const std::tm & gmtm = details::os::gmtime())
+        {
+            int local_year = localtm.tm_year + (1900 - 1);
+            int gmt_year = gmtm.tm_year + (1900 - 1);
+
+            long int days = (
+                                // difference in day of year
+                                localtm.tm_yday - gmtm.tm_yday
+
+                                // + intervening leap days
+                                + ((local_year >> 2) - (gmt_year >> 2))
+                                - (local_year / 100 - gmt_year / 100)
+                                + ((local_year / 100 >> 2) - (gmt_year / 100 >> 2))
+
+                                // + difference in years * 365 */
+                                + (long int)(local_year - gmt_year) * 365
+                            );
+
+            long int hours = (24 * days) + (localtm.tm_hour - gmtm.tm_hour);
+            long int mins = (60 * hours) + (localtm.tm_min - gmtm.tm_min);
+            long int secs = (60 * mins) + (localtm.tm_sec - gmtm.tm_sec);
+
+            return secs;
+        }
+    };
+
+    long int offset_seconds = helper::calculate_gmt_offset(tm);
+#else
+    long int offset_seconds = tm.tm_gmtoff;
+#endif
+
+    return static_cast<int>(offset_seconds / 60);
+#endif
+}
+
+//Return current thread id as size_t
+//It exists because the std::this_thread::get_id() is much slower(especially under VS 2013)
+inline size_t _thread_id()
+{
+#ifdef _WIN32
+    return  static_cast<size_t>(::GetCurrentThreadId());
+#elif __linux__
+# if defined(__ANDROID__) && defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
+#  define SYS_gettid __NR_gettid
+# endif
+    return  static_cast<size_t>(syscall(SYS_gettid));
+#elif __FreeBSD__
+    long tid;
+    thr_self(&tid);
+    return static_cast<size_t>(tid);
+#elif __APPLE__
+    uint64_t tid;
+    pthread_threadid_np(nullptr, &tid);
+    return static_cast<size_t>(tid);
+#else //Default to standard C++11 (other Unix)
+    return static_cast<size_t>(std::hash<std::thread::id>()(std::this_thread::get_id()));
+#endif
+}
+
+//Return current thread id as size_t (from thread local storage)
+inline size_t thread_id()
+{
+#if defined(SPDLOG_DISABLE_TID_CACHING) || (defined(_MSC_VER) && (_MSC_VER < 1900)) || (defined(__clang__) && !__has_feature(cxx_thread_local))
+    return _thread_id();
+#else // cache thread id in tls
+    static thread_local const size_t tid = _thread_id();
+    return tid;
+#endif
+
+
+}
+
+
+// This is avoid msvc issue in sleep_for that happens if the clock changes.
+// See https://github.com/gabime/spdlog/issues/609
+inline void sleep_for_millis(int milliseconds)
+{
+#if defined(_WIN32)
+    Sleep(milliseconds);
+#else
+    std::this_thread::sleep_for(std::chrono::milliseconds(milliseconds));
+#endif
+}
+
+// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+#define SPDLOG_FILENAME_T(s) L ## s
+inline std::string filename_to_str(const filename_t& filename)
+{
+    std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> c;
+    return c.to_bytes(filename);
+}
+#else
+#define SPDLOG_FILENAME_T(s) s
+inline std::string filename_to_str(const filename_t& filename)
+{
+    return filename;
+}
+#endif
+
+inline std::string errno_to_string(char[256], char* res)
+{
+    return std::string(res);
+}
+
+inline std::string errno_to_string(char buf[256], int res)
+{
+    if (res == 0)
+    {
+        return std::string(buf);
+    }
+    else
+    {
+        return "Unknown error";
+    }
+}
+
+// Return errno string (thread safe)
+inline std::string errno_str(int err_num)
+{
+    char buf[256];
+    SPDLOG_CONSTEXPR auto buf_size = sizeof(buf);
+
+#ifdef _WIN32
+    if (strerror_s(buf, buf_size, err_num) == 0)
+        return std::string(buf);
+    else
+        return "Unknown error";
+
+#elif defined(__FreeBSD__) || defined(__APPLE__) || defined(ANDROID) || defined(__SUNPRO_CC) || \
+      ((_POSIX_C_SOURCE >= 200112L) && ! defined(_GNU_SOURCE)) // posix version
+
+    if (strerror_r(err_num, buf, buf_size) == 0)
+        return std::string(buf);
+    else
+        return "Unknown error";
+
+#else  // gnu version (might not use the given buf, so its retval pointer must be used)
+    auto err = strerror_r(err_num, buf, buf_size); // let compiler choose type
+    return errno_to_string(buf, err); // use overloading to select correct stringify function
+#endif
+}
+
+inline int pid()
+{
+
+#ifdef _WIN32
+    return ::_getpid();
+#else
+    return static_cast<int>(::getpid());
+#endif
+
+}
+
+
+// Determine if the terminal supports colors
+// Source: https://github.com/agauniyal/rang/
+inline bool is_color_terminal()
+{
+#ifdef _WIN32
+    return true;
+#else
+    static constexpr const char* Terms[] =
+    {
+        "ansi", "color", "console", "cygwin", "gnome", "konsole", "kterm",
+        "linux", "msys", "putty", "rxvt", "screen", "vt100", "xterm"
+    };
+
+    const char *env_p = std::getenv("TERM");
+    if (env_p == nullptr)
+    {
+        return false;
+    }
+
+    static const bool result = std::any_of(
+                                   std::begin(Terms), std::end(Terms), [&](const char* term)
+    {
+        return std::strstr(env_p, term) != nullptr;
+    });
+    return result;
+#endif
+}
+
+
+// Detrmine if the terminal attached
+// Source: https://github.com/agauniyal/rang/
+inline bool in_terminal(FILE* file)
+{
+
+#ifdef _WIN32
+    return _isatty(_fileno(file)) ? true : false;
+#else
+    return isatty(fileno(file)) ? true : false;
+#endif
+}
+} //os
+} //details
+} //spdlog
diff --git a/3d_party/spd_log/include/spdlog/details/pattern_formatter_impl.h b/3d_party/spd_log/include/spdlog/details/pattern_formatter_impl.h
new file mode 100644
index 000000000..a73f5deab
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/pattern_formatter_impl.h
@@ -0,0 +1,686 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "../formatter.h"
+#include "../details/log_msg.h"
+#include "../details/os.h"
+#include "../fmt/fmt.h"
+
+#include <chrono>
+#include <ctime>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <utility>
+#include <vector>
+#include <array>
+
+namespace spdlog
+{
+namespace details
+{
+class flag_formatter
+{
+public:
+    virtual ~flag_formatter()
+    {}
+    virtual void format(details::log_msg& msg, const std::tm& tm_time) = 0;
+};
+
+///////////////////////////////////////////////////////////////////////
+// name & level pattern appenders
+///////////////////////////////////////////////////////////////////////
+namespace
+{
+class name_formatter:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << *msg.logger_name;
+    }
+};
+}
+
+// log level appender
+class level_formatter:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << level::to_str(msg.level);
+    }
+};
+
+// short log level appender
+class short_level_formatter:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << level::to_short_str(msg.level);
+    }
+};
+
+///////////////////////////////////////////////////////////////////////
+// Date time pattern appenders
+///////////////////////////////////////////////////////////////////////
+
+static const char* ampm(const tm& t)
+{
+    return t.tm_hour >= 12 ? "PM" : "AM";
+}
+
+static int to12h(const tm& t)
+{
+    return t.tm_hour > 12 ? t.tm_hour - 12 : t.tm_hour;
+}
+
+//Abbreviated weekday name
+static const std::string days[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+class a_formatter:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << days[tm_time.tm_wday];
+    }
+};
+
+//Full weekday name
+static const std::string full_days[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
+class A_formatter:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << full_days[tm_time.tm_wday];
+    }
+};
+
+//Abbreviated month
+static const std::string  months[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec" };
+class b_formatter:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << months[tm_time.tm_mon];
+    }
+};
+
+//Full month name
+static const std::string full_months[] { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
+class B_formatter:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << full_months[tm_time.tm_mon];
+    }
+};
+
+
+//write 2 ints separated by sep with padding of 2
+static fmt::MemoryWriter& pad_n_join(fmt::MemoryWriter& w, int v1, int v2, char sep)
+{
+    w << fmt::pad(v1, 2, '0') << sep << fmt::pad(v2, 2, '0');
+    return w;
+}
+
+//write 3 ints separated by sep with padding of 2
+static fmt::MemoryWriter& pad_n_join(fmt::MemoryWriter& w, int v1, int v2, int v3, char sep)
+{
+    w << fmt::pad(v1, 2, '0') << sep << fmt::pad(v2, 2, '0') << sep << fmt::pad(v3, 2, '0');
+    return w;
+}
+
+
+//Date and time representation (Thu Aug 23 15:35:46 2014)
+class c_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << days[tm_time.tm_wday] << ' ' << months[tm_time.tm_mon] << ' ' << tm_time.tm_mday << ' ';
+        pad_n_join(msg.formatted, tm_time.tm_hour, tm_time.tm_min, tm_time.tm_sec, ':') << ' ' << tm_time.tm_year + 1900;
+    }
+};
+
+
+// year - 2 digit
+class C_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_year % 100, 2, '0');
+    }
+};
+
+
+
+// Short MM/DD/YY date, equivalent to %m/%d/%y 08/23/01
+class D_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, tm_time.tm_mon + 1, tm_time.tm_mday, tm_time.tm_year % 100, '/');
+    }
+};
+
+
+// year - 4 digit
+class Y_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << tm_time.tm_year + 1900;
+    }
+};
+
+// month 1-12
+class m_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_mon + 1, 2, '0');
+    }
+};
+
+// day of month 1-31
+class d_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_mday, 2, '0');
+    }
+};
+
+// hours in 24 format  0-23
+class H_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_hour, 2, '0');
+    }
+};
+
+// hours in 12 format  1-12
+class I_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(to12h(tm_time), 2, '0');
+    }
+};
+
+// minutes 0-59
+class M_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_min, 2, '0');
+    }
+};
+
+// seconds 0-59
+class S_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_sec, 2, '0');
+    }
+};
+
+// milliseconds
+class e_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        auto duration = msg.time.time_since_epoch();
+        auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() % 1000;
+        msg.formatted << fmt::pad(static_cast<int>(millis), 3, '0');
+    }
+};
+
+// microseconds
+class f_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        auto duration = msg.time.time_since_epoch();
+        auto micros = std::chrono::duration_cast<std::chrono::microseconds>(duration).count() % 1000000;
+        msg.formatted << fmt::pad(static_cast<int>(micros), 6, '0');
+    }
+};
+
+// nanoseconds
+class F_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        auto duration = msg.time.time_since_epoch();
+        auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count() % 1000000000;
+        msg.formatted << fmt::pad(static_cast<int>(ns), 9, '0');
+    }
+};
+
+class E_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        auto duration = msg.time.time_since_epoch();
+        auto seconds = std::chrono::duration_cast<std::chrono::seconds>(duration).count();
+        msg.formatted << seconds;
+    }
+};
+
+// AM/PM
+class p_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << ampm(tm_time);
+    }
+};
+
+
+// 12 hour clock 02:55:02 pm
+class r_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, to12h(tm_time), tm_time.tm_min, tm_time.tm_sec, ':') << ' ' << ampm(tm_time);
+    }
+};
+
+// 24-hour HH:MM time, equivalent to %H:%M
+class R_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, tm_time.tm_hour, tm_time.tm_min, ':');
+    }
+};
+
+// ISO 8601 time format (HH:MM:SS), equivalent to %H:%M:%S
+class T_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, tm_time.tm_hour, tm_time.tm_min, tm_time.tm_sec, ':');
+    }
+};
+
+// ISO 8601 offset from UTC in timezone (+-HH:MM)
+class z_formatter SPDLOG_FINAL:public flag_formatter
+{
+public:
+    const std::chrono::seconds cache_refresh = std::chrono::seconds(5);
+
+    z_formatter():_last_update(std::chrono::seconds(0)), _offset_minutes(0)
+    {}
+    z_formatter(const z_formatter&) = delete;
+    z_formatter& operator=(const z_formatter&) = delete;
+
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+#ifdef _WIN32
+        int total_minutes = get_cached_offset(msg, tm_time);
+#else
+        // No need to chache under gcc,
+        // it is very fast (already stored in tm.tm_gmtoff)
+        int total_minutes = os::utc_minutes_offset(tm_time);
+#endif
+        bool is_negative = total_minutes < 0;
+        char sign;
+        if (is_negative)
+        {
+            total_minutes = -total_minutes;
+            sign = '-';
+        }
+        else
+        {
+            sign = '+';
+        }
+
+        int h = total_minutes / 60;
+        int m = total_minutes % 60;
+        msg.formatted << sign;
+        pad_n_join(msg.formatted, h, m, ':');
+    }
+private:
+    log_clock::time_point _last_update;
+    int _offset_minutes;
+    std::mutex _mutex;
+
+    int get_cached_offset(const log_msg& msg, const std::tm& tm_time)
+    {
+        using namespace std::chrono;
+        std::lock_guard<std::mutex> l(_mutex);
+        if (msg.time - _last_update >= cache_refresh)
+        {
+            _offset_minutes = os::utc_minutes_offset(tm_time);
+            _last_update = msg.time;
+        }
+        return _offset_minutes;
+    }
+};
+
+
+
+// Thread id
+class t_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << msg.thread_id;
+    }
+};
+
+// Current pid
+class pid_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << details::os::pid();
+    }
+};
+
+// message counter formatter
+class i_formatter SPDLOG_FINAL :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << fmt::pad(msg.msg_id, 6, '0');
+    }
+};
+
+class v_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << fmt::StringRef(msg.raw.data(), msg.raw.size());
+    }
+};
+
+class ch_formatter SPDLOG_FINAL:public flag_formatter
+{
+public:
+    explicit ch_formatter(char ch): _ch(ch)
+    {}
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << _ch;
+    }
+private:
+    char _ch;
+};
+
+
+//aggregate user chars to display as is
+class aggregate_formatter SPDLOG_FINAL:public flag_formatter
+{
+public:
+    aggregate_formatter()
+    {}
+    void add_ch(char ch)
+    {
+        _str += ch;
+    }
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << _str;
+    }
+private:
+    std::string _str;
+};
+
+// Full info formatter
+// pattern: [%Y-%m-%d %H:%M:%S.%e] [%n] [%l] %v
+class full_formatter SPDLOG_FINAL:public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+#ifndef SPDLOG_NO_DATETIME
+        auto duration = msg.time.time_since_epoch();
+        auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() % 1000;
+
+        /* Slower version(while still very fast - about 3.2 million lines/sec under 10 threads),
+        msg.formatted.write("[{:d}-{:02d}-{:02d} {:02d}:{:02d}:{:02d}.{:03d}] [{}] [{}] {} ",
+        tm_time.tm_year + 1900,
+        tm_time.tm_mon + 1,
+        tm_time.tm_mday,
+        tm_time.tm_hour,
+        tm_time.tm_min,
+        tm_time.tm_sec,
+        static_cast<int>(millis),
+        msg.logger_name,
+        level::to_str(msg.level),
+        msg.raw.str());*/
+
+
+        // Faster (albeit uglier) way to format the line (5.6 million lines/sec under 10 threads)
+        msg.formatted << '[' << static_cast<unsigned int>(tm_time.tm_year + 1900) << '-'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_mon + 1), 2, '0') << '-'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_mday), 2, '0') << ' '
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_hour), 2, '0') << ':'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_min), 2, '0') << ':'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_sec), 2, '0') << '.'
+                      << fmt::pad(static_cast<unsigned int>(millis), 3, '0') << "] ";
+
+        //no datetime needed
+#else
+        (void)tm_time;
+#endif
+
+#ifndef SPDLOG_NO_NAME
+        msg.formatted << '[' << *msg.logger_name << "] ";
+#endif
+
+        msg.formatted << '[' << level::to_str(msg.level) << "] ";
+        msg.formatted << fmt::StringRef(msg.raw.data(), msg.raw.size());
+    }
+};
+
+
+
+}
+}
+///////////////////////////////////////////////////////////////////////////////
+// pattern_formatter inline impl
+///////////////////////////////////////////////////////////////////////////////
+inline spdlog::pattern_formatter::pattern_formatter(const std::string& pattern, pattern_time_type pattern_time)
+    : _pattern_time(pattern_time)
+{
+    compile_pattern(pattern);
+}
+
+inline void spdlog::pattern_formatter::compile_pattern(const std::string& pattern)
+{
+    auto end = pattern.end();
+    std::unique_ptr<details::aggregate_formatter> user_chars;
+    for (auto it = pattern.begin(); it != end; ++it)
+    {
+        if (*it == '%')
+        {
+            if (user_chars) //append user chars found so far
+                _formatters.push_back(std::move(user_chars));
+
+            if (++it != end)
+                handle_flag(*it);
+            else
+                break;
+        }
+        else // chars not following the % sign should be displayed as is
+        {
+            if (!user_chars)
+                user_chars = std::unique_ptr<details::aggregate_formatter>(new details::aggregate_formatter());
+            user_chars->add_ch(*it);
+        }
+    }
+    if (user_chars) //append raw chars found so far
+    {
+        _formatters.push_back(std::move(user_chars));
+    }
+
+}
+inline void spdlog::pattern_formatter::handle_flag(char flag)
+{
+    switch (flag)
+    {
+    // logger name
+    case 'n':
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::name_formatter()));
+        break;
+
+    case 'l':
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::level_formatter()));
+        break;
+
+    case 'L':
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::short_level_formatter()));
+        break;
+
+    case('t'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::t_formatter()));
+        break;
+
+    case('v'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::v_formatter()));
+        break;
+
+    case('a'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::a_formatter()));
+        break;
+
+    case('A'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::A_formatter()));
+        break;
+
+    case('b'):
+    case('h'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::b_formatter()));
+        break;
+
+    case('B'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::B_formatter()));
+        break;
+    case('c'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::c_formatter()));
+        break;
+
+    case('C'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::C_formatter()));
+        break;
+
+    case('Y'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::Y_formatter()));
+        break;
+
+    case('D'):
+    case('x'):
+
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::D_formatter()));
+        break;
+
+    case('m'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::m_formatter()));
+        break;
+
+    case('d'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::d_formatter()));
+        break;
+
+    case('H'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::H_formatter()));
+        break;
+
+    case('I'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::I_formatter()));
+        break;
+
+    case('M'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::M_formatter()));
+        break;
+
+    case('S'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::S_formatter()));
+        break;
+
+    case('e'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::e_formatter()));
+        break;
+
+    case('f'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::f_formatter()));
+        break;
+    case('F'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::F_formatter()));
+        break;
+
+    case('E'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::E_formatter()));
+        break;
+
+    case('p'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::p_formatter()));
+        break;
+
+    case('r'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::r_formatter()));
+        break;
+
+    case('R'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::R_formatter()));
+        break;
+
+    case('T'):
+    case('X'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::T_formatter()));
+        break;
+
+    case('z'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::z_formatter()));
+        break;
+
+    case ('+'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::full_formatter()));
+        break;
+
+    case ('P'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::pid_formatter()));
+        break;
+
+
+    case ('i'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::i_formatter()));
+        break;
+
+    default: //Unknown flag appears as is
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter('%')));
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter(flag)));
+        break;
+    }
+}
+
+inline std::tm spdlog::pattern_formatter::get_time(details::log_msg& msg)
+{
+    if (_pattern_time == pattern_time_type::local)
+        return details::os::localtime(log_clock::to_time_t(msg.time));
+    else
+        return details::os::gmtime(log_clock::to_time_t(msg.time));
+}
+
+inline void spdlog::pattern_formatter::format(details::log_msg& msg)
+{
+
+#ifndef SPDLOG_NO_DATETIME
+    auto tm_time = get_time(msg);
+#else
+    std::tm tm_time;
+#endif
+    for (auto &f : _formatters)
+    {
+        f->format(msg, tm_time);
+    }
+    //write eol
+    msg.formatted.write(details::os::eol, details::os::eol_size);
+}
diff --git a/3d_party/spd_log/include/spdlog/details/registry.h b/3d_party/spd_log/include/spdlog/details/registry.h
new file mode 100644
index 000000000..b68b9f5a3
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/registry.h
@@ -0,0 +1,225 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Loggers registy of unique name->logger pointer
+// An attempt to create a logger with an already existing name will be ignored
+// If user requests a non existing logger, nullptr will be returned
+// This class is thread safe
+
+#include "../details/null_mutex.h"
+#include "../logger.h"
+#include "../async_logger.h"
+#include "../common.h"
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+
+namespace spdlog
+{
+namespace details
+{
+template <class Mutex> class registry_t
+{
+public:
+
+    void register_logger(std::shared_ptr<logger> logger)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        auto logger_name = logger->name();
+        throw_if_exists(logger_name);
+        _loggers[logger_name] = logger;
+    }
+
+
+    std::shared_ptr<logger> get(const std::string& logger_name)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        auto found = _loggers.find(logger_name);
+        return found == _loggers.end() ? nullptr : found->second;
+    }
+
+    template<class It>
+    std::shared_ptr<logger> create(const std::string& logger_name, const It& sinks_begin, const It& sinks_end)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        throw_if_exists(logger_name);
+        std::shared_ptr<logger> new_logger;
+        if (_async_mode)
+            new_logger = std::make_shared<async_logger>(logger_name, sinks_begin, sinks_end, _async_q_size, _overflow_policy, _worker_warmup_cb, _flush_interval_ms, _worker_teardown_cb);
+        else
+            new_logger = std::make_shared<logger>(logger_name, sinks_begin, sinks_end);
+
+        if (_formatter)
+            new_logger->set_formatter(_formatter);
+
+        if (_err_handler)
+            new_logger->set_error_handler(_err_handler);
+
+        new_logger->set_level(_level);
+        new_logger->flush_on(_flush_level);
+
+
+        //Add to registry
+        _loggers[logger_name] = new_logger;
+        return new_logger;
+    }
+
+    template<class It>
+    std::shared_ptr<async_logger> create_async(const std::string& logger_name, size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb, const It& sinks_begin, const It& sinks_end)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        throw_if_exists(logger_name);
+        auto new_logger = std::make_shared<async_logger>(logger_name, sinks_begin, sinks_end, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb);
+
+        if (_formatter)
+            new_logger->set_formatter(_formatter);
+
+        if (_err_handler)
+            new_logger->set_error_handler(_err_handler);
+
+        new_logger->set_level(_level);
+        new_logger->flush_on(_flush_level);
+
+        //Add to registry
+        _loggers[logger_name] = new_logger;
+        return new_logger;
+    }
+
+    void apply_all(std::function<void(std::shared_ptr<logger>)> fun)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        for (auto &l : _loggers)
+            fun(l.second);
+    }
+
+    void drop(const std::string& logger_name)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _loggers.erase(logger_name);
+    }
+
+    void drop_all()
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _loggers.clear();
+    }
+    std::shared_ptr<logger> create(const std::string& logger_name, sinks_init_list sinks)
+    {
+        return create(logger_name, sinks.begin(), sinks.end());
+    }
+
+    std::shared_ptr<logger> create(const std::string& logger_name, sink_ptr sink)
+    {
+        return create(logger_name, { sink });
+    }
+
+    std::shared_ptr<async_logger> create_async(const std::string& logger_name, size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb, sinks_init_list sinks)
+    {
+        return create_async(logger_name, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb, sinks.begin(), sinks.end());
+    }
+
+    std::shared_ptr<async_logger> create_async(const std::string& logger_name, size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb, sink_ptr sink)
+    {
+        return create_async(logger_name, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb, { sink });
+    }
+
+    void formatter(formatter_ptr f)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _formatter = f;
+        for (auto& l : _loggers)
+            l.second->set_formatter(_formatter);
+    }
+
+    void set_pattern(const std::string& pattern)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _formatter = std::make_shared<pattern_formatter>(pattern);
+        for (auto& l : _loggers)
+            l.second->set_formatter(_formatter);
+    }
+
+    void set_level(level::level_enum log_level)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        for (auto& l : _loggers)
+            l.second->set_level(log_level);
+        _level = log_level;
+    }
+
+    void flush_on(level::level_enum log_level)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        for (auto& l : _loggers)
+            l.second->flush_on(log_level);
+        _flush_level = log_level;
+    }
+
+    void set_error_handler(log_err_handler handler)
+    {
+        for (auto& l : _loggers)
+            l.second->set_error_handler(handler);
+        _err_handler = handler;
+    }
+
+    void set_async_mode(size_t q_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _async_mode = true;
+        _async_q_size = q_size;
+        _overflow_policy = overflow_policy;
+        _worker_warmup_cb = worker_warmup_cb;
+        _flush_interval_ms = flush_interval_ms;
+        _worker_teardown_cb = worker_teardown_cb;
+    }
+
+    void set_sync_mode()
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _async_mode = false;
+    }
+
+    static registry_t<Mutex>& instance()
+    {
+        static registry_t<Mutex> s_instance;
+        return s_instance;
+    }
+
+private:
+    registry_t<Mutex>() {}
+    registry_t<Mutex>(const registry_t<Mutex>&) = delete;
+    registry_t<Mutex>& operator=(const registry_t<Mutex>&) = delete;
+
+    void throw_if_exists(const std::string &logger_name)
+    {
+        if (_loggers.find(logger_name) != _loggers.end())
+            throw spdlog_ex("logger with name '" + logger_name + "' already exists");
+    }
+    Mutex _mutex;
+    std::unordered_map <std::string, std::shared_ptr<logger>> _loggers;
+    formatter_ptr _formatter;
+    level::level_enum _level = level::info;
+    level::level_enum _flush_level = level::off;
+    log_err_handler _err_handler;
+    bool _async_mode = false;
+    size_t _async_q_size = 0;
+    async_overflow_policy _overflow_policy = async_overflow_policy::block_retry;
+    std::function<void()> _worker_warmup_cb = nullptr;
+    std::chrono::milliseconds _flush_interval_ms;
+    std::function<void()> _worker_teardown_cb = nullptr;
+};
+#ifdef SPDLOG_NO_REGISTRY_MUTEX
+typedef registry_t<spdlog::details::null_mutex> registry;
+#else
+typedef registry_t<std::mutex> registry;
+#endif
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/details/spdlog_impl.h b/3d_party/spd_log/include/spdlog/details/spdlog_impl.h
new file mode 100644
index 000000000..25c7b7e9a
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/details/spdlog_impl.h
@@ -0,0 +1,268 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+//
+// Global registry functions
+//
+#include "../spdlog.h"
+#include "../details/registry.h"
+#include "../sinks/file_sinks.h"
+#include "../sinks/stdout_sinks.h"
+#ifdef SPDLOG_ENABLE_SYSLOG
+#include "../sinks/syslog_sink.h"
+#endif
+
+#ifdef _WIN32
+#include "../sinks/wincolor_sink.h"
+#else
+#include "../sinks/ansicolor_sink.h"
+#endif
+
+
+#ifdef __ANDROID__
+#include "../sinks/android_sink.h"
+#endif
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <string>
+
+inline void spdlog::register_logger(std::shared_ptr<logger> logger)
+{
+    return details::registry::instance().register_logger(logger);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::get(const std::string& name)
+{
+    return details::registry::instance().get(name);
+}
+
+inline void spdlog::drop(const std::string &name)
+{
+    details::registry::instance().drop(name);
+}
+
+// Create multi/single threaded simple file logger
+inline std::shared_ptr<spdlog::logger> spdlog::basic_logger_mt(const std::string& logger_name, const filename_t& filename, bool truncate)
+{
+    return create<spdlog::sinks::simple_file_sink_mt>(logger_name, filename, truncate);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::basic_logger_st(const std::string& logger_name, const filename_t& filename, bool truncate)
+{
+    return create<spdlog::sinks::simple_file_sink_st>(logger_name, filename, truncate);
+}
+
+// Create multi/single threaded rotating file logger
+inline std::shared_ptr<spdlog::logger> spdlog::rotating_logger_mt(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files)
+{
+    return create<spdlog::sinks::rotating_file_sink_mt>(logger_name, filename, max_file_size, max_files);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::rotating_logger_st(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files)
+{
+    return create<spdlog::sinks::rotating_file_sink_st>(logger_name, filename, max_file_size, max_files);
+}
+
+// Create file logger which creates new file at midnight):
+inline std::shared_ptr<spdlog::logger> spdlog::daily_logger_mt(const std::string& logger_name, const filename_t& filename, int hour, int minute)
+{
+    return create<spdlog::sinks::daily_file_sink_mt>(logger_name, filename, hour, minute);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::daily_logger_st(const std::string& logger_name, const filename_t& filename, int hour, int minute)
+{
+    return create<spdlog::sinks::daily_file_sink_st>(logger_name, filename, hour, minute);
+}
+
+
+//
+// stdout/stderr loggers
+//
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_logger_mt(const std::string& logger_name)
+{
+    return spdlog::details::registry::instance().create(logger_name, spdlog::sinks::stdout_sink_mt::instance());
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_logger_st(const std::string& logger_name)
+{
+    return spdlog::details::registry::instance().create(logger_name, spdlog::sinks::stdout_sink_st::instance());
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_logger_mt(const std::string& logger_name)
+{
+    return spdlog::details::registry::instance().create(logger_name, spdlog::sinks::stderr_sink_mt::instance());
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_logger_st(const std::string& logger_name)
+{
+    return spdlog::details::registry::instance().create(logger_name, spdlog::sinks::stderr_sink_st::instance());
+}
+
+//
+// stdout/stderr color loggers
+//
+#ifdef _WIN32
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_color_mt(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::wincolor_stdout_sink_mt>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_color_st(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::wincolor_stdout_sink_st>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_color_mt(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::wincolor_stderr_sink_mt>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_color_st(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::wincolor_stderr_sink_st>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+#else //ansi terminal colors
+
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_color_mt(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::ansicolor_stdout_sink_mt>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_color_st(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::ansicolor_stdout_sink_st>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_color_mt(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::ansicolor_stderr_sink_mt>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_color_st(const std::string& logger_name)
+{
+    auto sink = std::make_shared<spdlog::sinks::ansicolor_stderr_sink_st>();
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+#endif
+
+#ifdef SPDLOG_ENABLE_SYSLOG
+// Create syslog logger
+inline std::shared_ptr<spdlog::logger> spdlog::syslog_logger(const std::string& logger_name, const std::string& syslog_ident, int syslog_option, int syslog_facility)
+{
+    return create<spdlog::sinks::syslog_sink>(logger_name, syslog_ident, syslog_option, syslog_facility);
+}
+#endif
+
+#ifdef __ANDROID__
+inline std::shared_ptr<spdlog::logger> spdlog::android_logger(const std::string& logger_name, const std::string& tag)
+{
+    return create<spdlog::sinks::android_sink>(logger_name, tag);
+}
+#endif
+
+// Create and register a logger a single sink
+inline std::shared_ptr<spdlog::logger> spdlog::create(const std::string& logger_name, const spdlog::sink_ptr& sink)
+{
+    return details::registry::instance().create(logger_name, sink);
+}
+
+//Create logger with multiple sinks
+
+inline std::shared_ptr<spdlog::logger> spdlog::create(const std::string& logger_name, spdlog::sinks_init_list sinks)
+{
+    return details::registry::instance().create(logger_name, sinks);
+}
+
+
+template <typename Sink, typename... Args>
+inline std::shared_ptr<spdlog::logger> spdlog::create(const std::string& logger_name, Args... args)
+{
+    sink_ptr sink = std::make_shared<Sink>(args...);
+    return details::registry::instance().create(logger_name, { sink });
+}
+
+
+template<class It>
+inline std::shared_ptr<spdlog::logger> spdlog::create(const std::string& logger_name, const It& sinks_begin, const It& sinks_end)
+{
+    return details::registry::instance().create(logger_name, sinks_begin, sinks_end);
+}
+
+// Create and register an async logger with a single sink
+inline std::shared_ptr<spdlog::logger> spdlog::create_async(const std::string& logger_name, const sink_ptr& sink, size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb)
+{
+    return details::registry::instance().create_async(logger_name, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb, sink);
+}
+
+// Create and register an async logger with multiple sinks
+inline std::shared_ptr<spdlog::logger> spdlog::create_async(const std::string& logger_name, sinks_init_list sinks, size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb )
+{
+    return details::registry::instance().create_async(logger_name, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb, sinks);
+}
+
+template<class It>
+inline std::shared_ptr<spdlog::logger> spdlog::create_async(const std::string& logger_name, const It& sinks_begin, const It& sinks_end, size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb)
+{
+    return details::registry::instance().create_async(logger_name, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb, sinks_begin, sinks_end);
+}
+
+inline void spdlog::set_formatter(spdlog::formatter_ptr f)
+{
+    details::registry::instance().formatter(f);
+}
+
+inline void spdlog::set_pattern(const std::string& format_string)
+{
+    return details::registry::instance().set_pattern(format_string);
+}
+
+inline void spdlog::set_level(level::level_enum log_level)
+{
+    return details::registry::instance().set_level(log_level);
+}
+
+inline void spdlog::flush_on(level::level_enum log_level)
+{
+    return details::registry::instance().flush_on(log_level);
+}
+
+inline void spdlog::set_error_handler(log_err_handler handler)
+{
+    return details::registry::instance().set_error_handler(handler);
+}
+
+
+inline void spdlog::set_async_mode(size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms, const std::function<void()>& worker_teardown_cb)
+{
+    details::registry::instance().set_async_mode(queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms, worker_teardown_cb);
+}
+
+inline void spdlog::set_sync_mode()
+{
+    details::registry::instance().set_sync_mode();
+}
+
+inline void spdlog::apply_all(std::function<void(std::shared_ptr<logger>)> fun)
+{
+    details::registry::instance().apply_all(fun);
+}
+
+inline void spdlog::drop_all()
+{
+    details::registry::instance().drop_all();
+}
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/LICENSE.rst b/3d_party/spd_log/include/spdlog/fmt/bundled/LICENSE.rst
new file mode 100644
index 000000000..eb6be6503
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/LICENSE.rst
@@ -0,0 +1,23 @@
+Copyright (c) 2012 - 2016, Victor Zverovich
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/format.cc b/3d_party/spd_log/include/spdlog/fmt/bundled/format.cc
new file mode 100644
index 000000000..09d2ea9fd
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/format.cc
@@ -0,0 +1,535 @@
+/*
+ Formatting library for C++
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice, this
+    list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "format.h"
+
+#include <string.h>
+
+#include <cctype>
+#include <cerrno>
+#include <climits>
+#include <cmath>
+#include <cstdarg>
+#include <cstddef>  // for std::ptrdiff_t
+
+#if defined(_WIN32) && defined(__MINGW32__)
+# include <cstring>
+#endif
+
+#if FMT_USE_WINDOWS_H
+# if !defined(FMT_HEADER_ONLY) && !defined(WIN32_LEAN_AND_MEAN)
+#  define WIN32_LEAN_AND_MEAN
+# endif
+# if defined(NOMINMAX) || defined(FMT_WIN_MINMAX)
+#  include <windows.h>
+# else
+#  define NOMINMAX
+#  include <windows.h>
+#  undef NOMINMAX
+# endif
+#endif
+
+#if FMT_EXCEPTIONS
+# define FMT_TRY try
+# define FMT_CATCH(x) catch (x)
+#else
+# define FMT_TRY if (true)
+# define FMT_CATCH(x) if (false)
+#endif
+
+#ifdef _MSC_VER
+# pragma warning(push)
+# pragma warning(disable: 4127)  // conditional expression is constant
+# pragma warning(disable: 4702)  // unreachable code
+// Disable deprecation warning for strerror. The latter is not called but
+// MSVC fails to detect it.
+# pragma warning(disable: 4996)
+#endif
+
+// Dummy implementations of strerror_r and strerror_s called if corresponding
+// system functions are not available.
+static inline fmt::internal::Null<> strerror_r(int, char *, ...) {
+  return fmt::internal::Null<>();
+}
+static inline fmt::internal::Null<> strerror_s(char *, std::size_t, ...) {
+  return fmt::internal::Null<>();
+}
+
+namespace fmt {
+
+FMT_FUNC internal::RuntimeError::~RuntimeError() FMT_DTOR_NOEXCEPT {}
+FMT_FUNC FormatError::~FormatError() FMT_DTOR_NOEXCEPT {}
+FMT_FUNC SystemError::~SystemError() FMT_DTOR_NOEXCEPT {}
+
+namespace {
+
+#ifndef _MSC_VER
+# define FMT_SNPRINTF snprintf
+#else  // _MSC_VER
+inline int fmt_snprintf(char *buffer, size_t size, const char *format, ...) {
+  va_list args;
+  va_start(args, format);
+  int result = vsnprintf_s(buffer, size, _TRUNCATE, format, args);
+  va_end(args);
+  return result;
+}
+# define FMT_SNPRINTF fmt_snprintf
+#endif  // _MSC_VER
+
+#if defined(_WIN32) && defined(__MINGW32__) && !defined(__NO_ISOCEXT)
+# define FMT_SWPRINTF snwprintf
+#else
+# define FMT_SWPRINTF swprintf
+#endif // defined(_WIN32) && defined(__MINGW32__) && !defined(__NO_ISOCEXT)
+
+const char RESET_COLOR[] = "\x1b[0m";
+
+typedef void (*FormatFunc)(Writer &, int, StringRef);
+
+// Portable thread-safe version of strerror.
+// Sets buffer to point to a string describing the error code.
+// This can be either a pointer to a string stored in buffer,
+// or a pointer to some static immutable string.
+// Returns one of the following values:
+//   0      - success
+//   ERANGE - buffer is not large enough to store the error message
+//   other  - failure
+// Buffer should be at least of size 1.
+int safe_strerror(
+    int error_code, char *&buffer, std::size_t buffer_size) FMT_NOEXCEPT {
+  FMT_ASSERT(buffer != 0 && buffer_size != 0, "invalid buffer");
+
+  class StrError {
+   private:
+    int error_code_;
+    char *&buffer_;
+    std::size_t buffer_size_;
+
+    // A noop assignment operator to avoid bogus warnings.
+    void operator=(const StrError &) {}
+
+    // Handle the result of XSI-compliant version of strerror_r.
+    int handle(int result) {
+      // glibc versions before 2.13 return result in errno.
+      return result == -1 ? errno : result;
+    }
+
+    // Handle the result of GNU-specific version of strerror_r.
+    int handle(char *message) {
+      // If the buffer is full then the message is probably truncated.
+      if (message == buffer_ && strlen(buffer_) == buffer_size_ - 1)
+        return ERANGE;
+      buffer_ = message;
+      return 0;
+    }
+
+    // Handle the case when strerror_r is not available.
+    int handle(internal::Null<>) {
+      return fallback(strerror_s(buffer_, buffer_size_, error_code_));
+    }
+
+    // Fallback to strerror_s when strerror_r is not available.
+    int fallback(int result) {
+      // If the buffer is full then the message is probably truncated.
+      return result == 0 && strlen(buffer_) == buffer_size_ - 1 ?
+            ERANGE : result;
+    }
+
+    // Fallback to strerror if strerror_r and strerror_s are not available.
+    int fallback(internal::Null<>) {
+      errno = 0;
+      buffer_ = strerror(error_code_);
+      return errno;
+    }
+
+   public:
+    StrError(int err_code, char *&buf, std::size_t buf_size)
+      : error_code_(err_code), buffer_(buf), buffer_size_(buf_size) {}
+
+    int run() {
+      // Suppress a warning about unused strerror_r.
+      strerror_r(0, FMT_NULL, "");
+      return handle(strerror_r(error_code_, buffer_, buffer_size_));
+    }
+  };
+  return StrError(error_code, buffer, buffer_size).run();
+}
+
+void format_error_code(Writer &out, int error_code,
+                       StringRef message) FMT_NOEXCEPT {
+  // Report error code making sure that the output fits into
+  // INLINE_BUFFER_SIZE to avoid dynamic memory allocation and potential
+  // bad_alloc.
+  out.clear();
+  static const char SEP[] = ": ";
+  static const char ERROR_STR[] = "error ";
+  // Subtract 2 to account for terminating null characters in SEP and ERROR_STR.
+  std::size_t error_code_size = sizeof(SEP) + sizeof(ERROR_STR) - 2;
+  typedef internal::IntTraits<int>::MainType MainType;
+  MainType abs_value = static_cast<MainType>(error_code);
+  if (internal::is_negative(error_code)) {
+    abs_value = 0 - abs_value;
+    ++error_code_size;
+  }
+  error_code_size += internal::count_digits(abs_value);
+  if (message.size() <= internal::INLINE_BUFFER_SIZE - error_code_size)
+    out << message << SEP;
+  out << ERROR_STR << error_code;
+  assert(out.size() <= internal::INLINE_BUFFER_SIZE);
+}
+
+void report_error(FormatFunc func, int error_code,
+                  StringRef message) FMT_NOEXCEPT {
+  MemoryWriter full_message;
+  func(full_message, error_code, message);
+  // Use Writer::data instead of Writer::c_str to avoid potential memory
+  // allocation.
+  std::fwrite(full_message.data(), full_message.size(), 1, stderr);
+  std::fputc('\n', stderr);
+}
+}  // namespace
+
+FMT_FUNC void SystemError::init(
+    int err_code, CStringRef format_str, ArgList args) {
+  error_code_ = err_code;
+  MemoryWriter w;
+  format_system_error(w, err_code, format(format_str, args));
+  std::runtime_error &base = *this;
+  base = std::runtime_error(w.str());
+}
+
+template <typename T>
+int internal::CharTraits<char>::format_float(
+    char *buffer, std::size_t size, const char *format,
+    unsigned width, int precision, T value) {
+  if (width == 0) {
+    return precision < 0 ?
+        FMT_SNPRINTF(buffer, size, format, value) :
+        FMT_SNPRINTF(buffer, size, format, precision, value);
+  }
+  return precision < 0 ?
+      FMT_SNPRINTF(buffer, size, format, width, value) :
+      FMT_SNPRINTF(buffer, size, format, width, precision, value);
+}
+
+template <typename T>
+int internal::CharTraits<wchar_t>::format_float(
+    wchar_t *buffer, std::size_t size, const wchar_t *format,
+    unsigned width, int precision, T value) {
+  if (width == 0) {
+    return precision < 0 ?
+        FMT_SWPRINTF(buffer, size, format, value) :
+        FMT_SWPRINTF(buffer, size, format, precision, value);
+  }
+  return precision < 0 ?
+      FMT_SWPRINTF(buffer, size, format, width, value) :
+      FMT_SWPRINTF(buffer, size, format, width, precision, value);
+}
+
+template <typename T>
+const char internal::BasicData<T>::DIGITS[] =
+    "0001020304050607080910111213141516171819"
+    "2021222324252627282930313233343536373839"
+    "4041424344454647484950515253545556575859"
+    "6061626364656667686970717273747576777879"
+    "8081828384858687888990919293949596979899";
+
+#define FMT_POWERS_OF_10(factor) \
+  factor * 10, \
+  factor * 100, \
+  factor * 1000, \
+  factor * 10000, \
+  factor * 100000, \
+  factor * 1000000, \
+  factor * 10000000, \
+  factor * 100000000, \
+  factor * 1000000000
+
+template <typename T>
+const uint32_t internal::BasicData<T>::POWERS_OF_10_32[] = {
+  0, FMT_POWERS_OF_10(1)
+};
+
+template <typename T>
+const uint64_t internal::BasicData<T>::POWERS_OF_10_64[] = {
+  0,
+  FMT_POWERS_OF_10(1),
+  FMT_POWERS_OF_10(ULongLong(1000000000)),
+  // Multiply several constants instead of using a single long long constant
+  // to avoid warnings about C++98 not supporting long long.
+  ULongLong(1000000000) * ULongLong(1000000000) * 10
+};
+
+FMT_FUNC void internal::report_unknown_type(char code, const char *type) {
+  (void)type;
+  if (std::isprint(static_cast<unsigned char>(code))) {
+    FMT_THROW(FormatError(
+        format("unknown format code '{}' for {}", code, type)));
+  }
+  FMT_THROW(FormatError(
+      format("unknown format code '\\x{:02x}' for {}",
+        static_cast<unsigned>(code), type)));
+}
+
+#if FMT_USE_WINDOWS_H
+
+FMT_FUNC internal::UTF8ToUTF16::UTF8ToUTF16(StringRef s) {
+  static const char ERROR_MSG[] = "cannot convert string from UTF-8 to UTF-16";
+  if (s.size() > INT_MAX)
+    FMT_THROW(WindowsError(ERROR_INVALID_PARAMETER, ERROR_MSG));
+  int s_size = static_cast<int>(s.size());
+  int length = MultiByteToWideChar(
+      CP_UTF8, MB_ERR_INVALID_CHARS, s.data(), s_size, FMT_NULL, 0);
+  if (length == 0)
+    FMT_THROW(WindowsError(GetLastError(), ERROR_MSG));
+  buffer_.resize(length + 1);
+  length = MultiByteToWideChar(
+    CP_UTF8, MB_ERR_INVALID_CHARS, s.data(), s_size, &buffer_[0], length);
+  if (length == 0)
+    FMT_THROW(WindowsError(GetLastError(), ERROR_MSG));
+  buffer_[length] = 0;
+}
+
+FMT_FUNC internal::UTF16ToUTF8::UTF16ToUTF8(WStringRef s) {
+  if (int error_code = convert(s)) {
+    FMT_THROW(WindowsError(error_code,
+        "cannot convert string from UTF-16 to UTF-8"));
+  }
+}
+
+FMT_FUNC int internal::UTF16ToUTF8::convert(WStringRef s) {
+  if (s.size() > INT_MAX)
+    return ERROR_INVALID_PARAMETER;
+  int s_size = static_cast<int>(s.size());
+  int length = WideCharToMultiByte(
+    CP_UTF8, 0, s.data(), s_size, FMT_NULL, 0, FMT_NULL, FMT_NULL);
+  if (length == 0)
+    return GetLastError();
+  buffer_.resize(length + 1);
+  length = WideCharToMultiByte(
+    CP_UTF8, 0, s.data(), s_size, &buffer_[0], length, FMT_NULL, FMT_NULL);
+  if (length == 0)
+    return GetLastError();
+  buffer_[length] = 0;
+  return 0;
+}
+
+FMT_FUNC void WindowsError::init(
+    int err_code, CStringRef format_str, ArgList args) {
+  error_code_ = err_code;
+  MemoryWriter w;
+  internal::format_windows_error(w, err_code, format(format_str, args));
+  std::runtime_error &base = *this;
+  base = std::runtime_error(w.str());
+}
+
+FMT_FUNC void internal::format_windows_error(
+    Writer &out, int error_code, StringRef message) FMT_NOEXCEPT {
+  FMT_TRY {
+    MemoryBuffer<wchar_t, INLINE_BUFFER_SIZE> buffer;
+    buffer.resize(INLINE_BUFFER_SIZE);
+    for (;;) {
+      wchar_t *system_message = &buffer[0];
+      int result = FormatMessageW(
+        FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+        FMT_NULL, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        system_message, static_cast<uint32_t>(buffer.size()), FMT_NULL);
+      if (result != 0) {
+        UTF16ToUTF8 utf8_message;
+        if (utf8_message.convert(system_message) == ERROR_SUCCESS) {
+          out << message << ": " << utf8_message;
+          return;
+        }
+        break;
+      }
+      if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+        break;  // Can't get error message, report error code instead.
+      buffer.resize(buffer.size() * 2);
+    }
+  } FMT_CATCH(...) {}
+  fmt::format_error_code(out, error_code, message);  // 'fmt::' is for bcc32.
+}
+
+#endif  // FMT_USE_WINDOWS_H
+
+FMT_FUNC void format_system_error(
+    Writer &out, int error_code, StringRef message) FMT_NOEXCEPT {
+  FMT_TRY {
+    internal::MemoryBuffer<char, internal::INLINE_BUFFER_SIZE> buffer;
+    buffer.resize(internal::INLINE_BUFFER_SIZE);
+    for (;;) {
+      char *system_message = &buffer[0];
+      int result = safe_strerror(error_code, system_message, buffer.size());
+      if (result == 0) {
+        out << message << ": " << system_message;
+        return;
+      }
+      if (result != ERANGE)
+        break;  // Can't get error message, report error code instead.
+      buffer.resize(buffer.size() * 2);
+    }
+  } FMT_CATCH(...) {}
+  fmt::format_error_code(out, error_code, message);  // 'fmt::' is for bcc32.
+}
+
+template <typename Char>
+void internal::ArgMap<Char>::init(const ArgList &args) {
+  if (!map_.empty())
+    return;
+  typedef internal::NamedArg<Char> NamedArg;
+  const NamedArg *named_arg = FMT_NULL;
+  bool use_values =
+      args.type(ArgList::MAX_PACKED_ARGS - 1) == internal::Arg::NONE;
+  if (use_values) {
+    for (unsigned i = 0;/*nothing*/; ++i) {
+      internal::Arg::Type arg_type = args.type(i);
+      switch (arg_type) {
+      case internal::Arg::NONE:
+        return;
+      case internal::Arg::NAMED_ARG:
+        named_arg = static_cast<const NamedArg*>(args.values_[i].pointer);
+        map_.push_back(Pair(named_arg->name, *named_arg));
+        break;
+      default:
+        /*nothing*/;
+      }
+    }
+    return;
+  }
+  for (unsigned i = 0; i != ArgList::MAX_PACKED_ARGS; ++i) {
+    internal::Arg::Type arg_type = args.type(i);
+    if (arg_type == internal::Arg::NAMED_ARG) {
+      named_arg = static_cast<const NamedArg*>(args.args_[i].pointer);
+      map_.push_back(Pair(named_arg->name, *named_arg));
+    }
+  }
+  for (unsigned i = ArgList::MAX_PACKED_ARGS;/*nothing*/; ++i) {
+    switch (args.args_[i].type) {
+    case internal::Arg::NONE:
+      return;
+    case internal::Arg::NAMED_ARG:
+      named_arg = static_cast<const NamedArg*>(args.args_[i].pointer);
+      map_.push_back(Pair(named_arg->name, *named_arg));
+      break;
+    default:
+      /*nothing*/;
+    }
+  }
+}
+
+template <typename Char>
+void internal::FixedBuffer<Char>::grow(std::size_t) {
+  FMT_THROW(std::runtime_error("buffer overflow"));
+}
+
+FMT_FUNC internal::Arg internal::FormatterBase::do_get_arg(
+    unsigned arg_index, const char *&error) {
+  internal::Arg arg = args_[arg_index];
+  switch (arg.type) {
+  case internal::Arg::NONE:
+    error = "argument index out of range";
+    break;
+  case internal::Arg::NAMED_ARG:
+    arg = *static_cast<const internal::Arg*>(arg.pointer);
+    break;
+  default:
+    /*nothing*/;
+  }
+  return arg;
+}
+
+FMT_FUNC void report_system_error(
+    int error_code, fmt::StringRef message) FMT_NOEXCEPT {
+  // 'fmt::' is for bcc32.
+  report_error(format_system_error, error_code, message);
+}
+
+#if FMT_USE_WINDOWS_H
+FMT_FUNC void report_windows_error(
+    int error_code, fmt::StringRef message) FMT_NOEXCEPT {
+  // 'fmt::' is for bcc32.
+  report_error(internal::format_windows_error, error_code, message);
+}
+#endif
+
+FMT_FUNC void print(std::FILE *f, CStringRef format_str, ArgList args) {
+  MemoryWriter w;
+  w.write(format_str, args);
+  std::fwrite(w.data(), 1, w.size(), f);
+}
+
+FMT_FUNC void print(CStringRef format_str, ArgList args) {
+  print(stdout, format_str, args);
+}
+
+FMT_FUNC void print_colored(Color c, CStringRef format, ArgList args) {
+  char escape[] = "\x1b[30m";
+  escape[3] = static_cast<char>('0' + c);
+  std::fputs(escape, stdout);
+  print(format, args);
+  std::fputs(RESET_COLOR, stdout);
+}
+
+#ifndef FMT_HEADER_ONLY
+
+template struct internal::BasicData<void>;
+
+// Explicit instantiations for char.
+
+template void internal::FixedBuffer<char>::grow(std::size_t);
+
+template void internal::ArgMap<char>::init(const ArgList &args);
+
+template FMT_API int internal::CharTraits<char>::format_float(
+    char *buffer, std::size_t size, const char *format,
+    unsigned width, int precision, double value);
+
+template FMT_API int internal::CharTraits<char>::format_float(
+    char *buffer, std::size_t size, const char *format,
+    unsigned width, int precision, long double value);
+
+// Explicit instantiations for wchar_t.
+
+template void internal::FixedBuffer<wchar_t>::grow(std::size_t);
+
+template void internal::ArgMap<wchar_t>::init(const ArgList &args);
+
+template FMT_API int internal::CharTraits<wchar_t>::format_float(
+    wchar_t *buffer, std::size_t size, const wchar_t *format,
+    unsigned width, int precision, double value);
+
+template FMT_API int internal::CharTraits<wchar_t>::format_float(
+    wchar_t *buffer, std::size_t size, const wchar_t *format,
+    unsigned width, int precision, long double value);
+
+#endif  // FMT_HEADER_ONLY
+
+}  // namespace fmt
+
+#ifdef _MSC_VER
+# pragma warning(pop)
+#endif
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/format.h b/3d_party/spd_log/include/spdlog/fmt/bundled/format.h
new file mode 100644
index 000000000..91f434813
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/format.h
@@ -0,0 +1,4659 @@
+/*
+ Formatting library for C++
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice, this
+    list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FMT_FORMAT_H_
+#define FMT_FORMAT_H_
+
+#include <cassert>
+#include <clocale>
+#include <cmath>
+#include <cstdio>
+#include <cstring>
+#include <limits>
+#include <memory>
+#include <stdexcept>
+#include <string>
+#include <vector>
+#include <utility>  // for std::pair
+
+// The fmt library version in the form major * 10000 + minor * 100 + patch.
+#define FMT_VERSION 40000
+
+#ifdef _SECURE_SCL
+# define FMT_SECURE_SCL _SECURE_SCL
+#else
+# define FMT_SECURE_SCL 0
+#endif
+
+#if FMT_SECURE_SCL
+# include <iterator>
+#endif
+
+#ifdef _MSC_VER
+# define FMT_MSC_VER _MSC_VER
+#else
+# define FMT_MSC_VER 0
+#endif
+
+#if FMT_MSC_VER && FMT_MSC_VER <= 1500
+typedef unsigned __int32 uint32_t;
+typedef unsigned __int64 uint64_t;
+typedef __int64          intmax_t;
+#else
+#include <stdint.h>
+#endif
+
+#if !defined(FMT_HEADER_ONLY) && defined(_WIN32)
+# ifdef FMT_EXPORT
+#  define FMT_API __declspec(dllexport)
+# elif defined(FMT_SHARED)
+#  define FMT_API __declspec(dllimport)
+# endif
+#endif
+#ifndef FMT_API
+# define FMT_API
+#endif
+
+#ifdef __GNUC__
+# define FMT_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+# define FMT_GCC_EXTENSION __extension__
+# if FMT_GCC_VERSION >= 406
+#  pragma GCC diagnostic push
+// Disable the warning about "long long" which is sometimes reported even
+// when using __extension__.
+#  pragma GCC diagnostic ignored "-Wlong-long"
+// Disable the warning about declaration shadowing because it affects too
+// many valid cases.
+#  pragma GCC diagnostic ignored "-Wshadow"
+// Disable the warning about implicit conversions that may change the sign of
+// an integer; silencing it otherwise would require many explicit casts.
+#  pragma GCC diagnostic ignored "-Wsign-conversion"
+# endif
+# if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__
+#  define FMT_HAS_GXX_CXX11 1
+# endif
+#else
+# define FMT_GCC_EXTENSION
+#endif
+
+#if defined(__INTEL_COMPILER)
+# define FMT_ICC_VERSION __INTEL_COMPILER
+#elif defined(__ICL)
+# define FMT_ICC_VERSION __ICL
+#endif
+
+#if defined(__clang__) && !defined(FMT_ICC_VERSION)
+# define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wdocumentation-unknown-command"
+# pragma clang diagnostic ignored "-Wpadded"
+#endif
+
+#ifdef __GNUC_LIBSTD__
+# define FMT_GNUC_LIBSTD_VERSION (__GNUC_LIBSTD__ * 100 + __GNUC_LIBSTD_MINOR__)
+#endif
+
+#ifdef __has_feature
+# define FMT_HAS_FEATURE(x) __has_feature(x)
+#else
+# define FMT_HAS_FEATURE(x) 0
+#endif
+
+#ifdef __has_builtin
+# define FMT_HAS_BUILTIN(x) __has_builtin(x)
+#else
+# define FMT_HAS_BUILTIN(x) 0
+#endif
+
+#ifdef __has_cpp_attribute
+# define FMT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
+#else
+# define FMT_HAS_CPP_ATTRIBUTE(x) 0
+#endif
+
+#ifndef FMT_USE_VARIADIC_TEMPLATES
+// Variadic templates are available in GCC since version 4.4
+// (http://gcc.gnu.org/projects/cxx0x.html) and in Visual C++
+// since version 2013.
+# define FMT_USE_VARIADIC_TEMPLATES \
+   (FMT_HAS_FEATURE(cxx_variadic_templates) || \
+       (FMT_GCC_VERSION >= 404 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1800)
+#endif
+
+#ifndef FMT_USE_RVALUE_REFERENCES
+// Don't use rvalue references when compiling with clang and an old libstdc++
+// as the latter doesn't provide std::move.
+# if defined(FMT_GNUC_LIBSTD_VERSION) && FMT_GNUC_LIBSTD_VERSION <= 402
+#  define FMT_USE_RVALUE_REFERENCES 0
+# else
+#  define FMT_USE_RVALUE_REFERENCES \
+    (FMT_HAS_FEATURE(cxx_rvalue_references) || \
+        (FMT_GCC_VERSION >= 403 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1600)
+# endif
+#endif
+
+// Check if exceptions are disabled.
+#if defined(__GNUC__) && !defined(__EXCEPTIONS)
+# define FMT_EXCEPTIONS 0
+#endif
+#if FMT_MSC_VER && !_HAS_EXCEPTIONS
+# define FMT_EXCEPTIONS 0
+#endif
+#ifndef FMT_EXCEPTIONS
+# define FMT_EXCEPTIONS 1
+#endif
+
+#ifndef FMT_THROW
+# if FMT_EXCEPTIONS
+#  define FMT_THROW(x) throw x
+# else
+#  define FMT_THROW(x) assert(false)
+# endif
+#endif
+
+// Define FMT_USE_NOEXCEPT to make fmt use noexcept (C++11 feature).
+#ifndef FMT_USE_NOEXCEPT
+# define FMT_USE_NOEXCEPT 0
+#endif
+
+#if FMT_USE_NOEXCEPT || FMT_HAS_FEATURE(cxx_noexcept) || \
+    (FMT_GCC_VERSION >= 408 && FMT_HAS_GXX_CXX11) || \
+    FMT_MSC_VER >= 1900
+# define FMT_DETECTED_NOEXCEPT noexcept
+#else
+# define FMT_DETECTED_NOEXCEPT throw()
+#endif
+
+#ifndef FMT_NOEXCEPT
+# if FMT_EXCEPTIONS
+#  define FMT_NOEXCEPT FMT_DETECTED_NOEXCEPT
+# else
+#  define FMT_NOEXCEPT
+# endif
+#endif
+
+// This is needed because GCC still uses throw() in its headers when exceptions
+// are disabled.
+#if FMT_GCC_VERSION
+# define FMT_DTOR_NOEXCEPT FMT_DETECTED_NOEXCEPT
+#else
+# define FMT_DTOR_NOEXCEPT FMT_NOEXCEPT
+#endif
+
+#ifndef FMT_OVERRIDE
+# if (defined(FMT_USE_OVERRIDE) && FMT_USE_OVERRIDE) || FMT_HAS_FEATURE(cxx_override) || \
+   (FMT_GCC_VERSION >= 408 && FMT_HAS_GXX_CXX11) || \
+   FMT_MSC_VER >= 1900
+#  define FMT_OVERRIDE override
+# else
+#  define FMT_OVERRIDE
+# endif
+#endif
+
+#ifndef FMT_NULL
+# if FMT_HAS_FEATURE(cxx_nullptr) || \
+   (FMT_GCC_VERSION >= 408 && FMT_HAS_GXX_CXX11) || \
+   FMT_MSC_VER >= 1600
+#  define FMT_NULL nullptr
+# else
+#  define FMT_NULL NULL
+# endif
+#endif
+
+// A macro to disallow the copy constructor and operator= functions
+// This should be used in the private: declarations for a class
+#ifndef FMT_USE_DELETED_FUNCTIONS
+# define FMT_USE_DELETED_FUNCTIONS 0
+#endif
+
+#if FMT_USE_DELETED_FUNCTIONS || FMT_HAS_FEATURE(cxx_deleted_functions) || \
+  (FMT_GCC_VERSION >= 404 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1800
+# define FMT_DELETED_OR_UNDEFINED  = delete
+# define FMT_DISALLOW_COPY_AND_ASSIGN(TypeName) \
+    TypeName(const TypeName&) = delete; \
+    TypeName& operator=(const TypeName&) = delete
+#else
+# define FMT_DELETED_OR_UNDEFINED
+# define FMT_DISALLOW_COPY_AND_ASSIGN(TypeName) \
+    TypeName(const TypeName&); \
+    TypeName& operator=(const TypeName&)
+#endif
+
+#ifndef FMT_USE_DEFAULTED_FUNCTIONS
+# define FMT_USE_DEFAULTED_FUNCTIONS 0
+#endif
+
+#ifndef FMT_DEFAULTED_COPY_CTOR
+# if FMT_USE_DEFAULTED_FUNCTIONS || FMT_HAS_FEATURE(cxx_defaulted_functions) || \
+   (FMT_GCC_VERSION >= 404 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1800
+#  define FMT_DEFAULTED_COPY_CTOR(TypeName) \
+    TypeName(const TypeName&) = default;
+# else
+#  define FMT_DEFAULTED_COPY_CTOR(TypeName)
+# endif
+#endif
+
+#ifndef FMT_USE_USER_DEFINED_LITERALS
+// All compilers which support UDLs also support variadic templates. This
+// makes the fmt::literals implementation easier. However, an explicit check
+// for variadic templates is added here just in case.
+// For Intel's compiler both it and the system gcc/msc must support UDLs.
+# define FMT_USE_USER_DEFINED_LITERALS \
+   FMT_USE_VARIADIC_TEMPLATES && FMT_USE_RVALUE_REFERENCES && \
+   (FMT_HAS_FEATURE(cxx_user_literals) || \
+     (FMT_GCC_VERSION >= 407 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1900) && \
+   (!defined(FMT_ICC_VERSION) || FMT_ICC_VERSION >= 1500)
+#endif
+
+#ifndef FMT_USE_EXTERN_TEMPLATES
+# define FMT_USE_EXTERN_TEMPLATES \
+    (FMT_CLANG_VERSION >= 209 || (FMT_GCC_VERSION >= 303 && FMT_HAS_GXX_CXX11))
+#endif
+
+#ifdef FMT_HEADER_ONLY
+// If header only do not use extern templates.
+# undef FMT_USE_EXTERN_TEMPLATES
+# define FMT_USE_EXTERN_TEMPLATES 0
+#endif
+
+#ifndef FMT_ASSERT
+# define FMT_ASSERT(condition, message) assert((condition) && message)
+#endif
+
+// __builtin_clz is broken in clang with Microsoft CodeGen:
+// https://github.com/fmtlib/fmt/issues/519
+#ifndef _MSC_VER
+# if FMT_GCC_VERSION >= 400 || FMT_HAS_BUILTIN(__builtin_clz)
+#  define FMT_BUILTIN_CLZ(n) __builtin_clz(n)
+# endif
+
+# if FMT_GCC_VERSION >= 400 || FMT_HAS_BUILTIN(__builtin_clzll)
+#  define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n)
+# endif
+#endif
+
+// Some compilers masquerade as both MSVC and GCC-likes or
+// otherwise support __builtin_clz and __builtin_clzll, so
+// only define FMT_BUILTIN_CLZ using the MSVC intrinsics
+// if the clz and clzll builtins are not available.
+#if FMT_MSC_VER && !defined(FMT_BUILTIN_CLZLL) && !defined(_MANAGED)
+# include <intrin.h>  // _BitScanReverse, _BitScanReverse64
+
+namespace fmt
+{
+namespace internal
+{
+# pragma intrinsic(_BitScanReverse)
+inline uint32_t clz(uint32_t x)
+{
+    unsigned long r = 0;
+    _BitScanReverse(&r, x);
+
+    assert(x != 0);
+    // Static analysis complains about using uninitialized data
+    // "r", but the only way that can happen is if "x" is 0,
+    // which the callers guarantee to not happen.
+# pragma warning(suppress: 6102)
+    return 31 - r;
+}
+# define FMT_BUILTIN_CLZ(n) fmt::internal::clz(n)
+
+# ifdef _WIN64
+#  pragma intrinsic(_BitScanReverse64)
+# endif
+
+inline uint32_t clzll(uint64_t x)
+{
+    unsigned long r = 0;
+# ifdef _WIN64
+    _BitScanReverse64(&r, x);
+# else
+    // Scan the high 32 bits.
+    if (_BitScanReverse(&r, static_cast<uint32_t>(x >> 32)))
+        return 63 - (r + 32);
+
+    // Scan the low 32 bits.
+    _BitScanReverse(&r, static_cast<uint32_t>(x));
+# endif
+
+    assert(x != 0);
+    // Static analysis complains about using uninitialized data
+    // "r", but the only way that can happen is if "x" is 0,
+    // which the callers guarantee to not happen.
+# pragma warning(suppress: 6102)
+    return 63 - r;
+}
+# define FMT_BUILTIN_CLZLL(n) fmt::internal::clzll(n)
+}
+}
+#endif
+
+namespace fmt
+{
+namespace internal
+{
+struct DummyInt
+{
+    int data[2];
+    operator int() const
+    {
+        return 0;
+    }
+};
+typedef std::numeric_limits<fmt::internal::DummyInt> FPUtil;
+
+// Dummy implementations of system functions such as signbit and ecvt called
+// if the latter are not available.
+inline DummyInt signbit(...)
+{
+    return DummyInt();
+}
+inline DummyInt _ecvt_s(...)
+{
+    return DummyInt();
+}
+inline DummyInt isinf(...)
+{
+    return DummyInt();
+}
+inline DummyInt _finite(...)
+{
+    return DummyInt();
+}
+inline DummyInt isnan(...)
+{
+    return DummyInt();
+}
+inline DummyInt _isnan(...)
+{
+    return DummyInt();
+}
+
+// A helper function to suppress bogus "conditional expression is constant"
+// warnings.
+template <typename T>
+inline T const_check(T value)
+{
+    return value;
+}
+}
+}  // namespace fmt
+
+namespace std
+{
+// Standard permits specialization of std::numeric_limits. This specialization
+// is used to resolve ambiguity between isinf and std::isinf in glibc:
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48891
+// and the same for isnan and signbit.
+template <>
+class numeric_limits<fmt::internal::DummyInt> :
+    public std::numeric_limits<int>
+{
+public:
+    // Portable version of isinf.
+    template <typename T>
+    static bool isinfinity(T x)
+    {
+        using namespace fmt::internal;
+        // The resolution "priority" is:
+        // isinf macro > std::isinf > ::isinf > fmt::internal::isinf
+        if (const_check(sizeof(isinf(x)) == sizeof(bool) ||
+                        sizeof(isinf(x)) == sizeof(int)))
+        {
+            return isinf(x) != 0;
+        }
+        return !_finite(static_cast<double>(x));
+    }
+
+    // Portable version of isnan.
+    template <typename T>
+    static bool isnotanumber(T x)
+    {
+        using namespace fmt::internal;
+        if (const_check(sizeof(isnan(x)) == sizeof(bool) ||
+                        sizeof(isnan(x)) == sizeof(int)))
+        {
+            return isnan(x) != 0;
+        }
+        return _isnan(static_cast<double>(x)) != 0;
+    }
+
+    // Portable version of signbit.
+    static bool isnegative(double x)
+    {
+        using namespace fmt::internal;
+        if (const_check(sizeof(signbit(x)) == sizeof(bool) ||
+                        sizeof(signbit(x)) == sizeof(int)))
+        {
+            return signbit(x) != 0;
+        }
+        if (x < 0) return true;
+        if (!isnotanumber(x)) return false;
+        int dec = 0, sign = 0;
+        char buffer[2];  // The buffer size must be >= 2 or _ecvt_s will fail.
+        _ecvt_s(buffer, sizeof(buffer), x, 0, &dec, &sign);
+        return sign != 0;
+    }
+};
+}  // namespace std
+
+namespace fmt
+{
+
+// Fix the warning about long long on older versions of GCC
+// that don't support the diagnostic pragma.
+FMT_GCC_EXTENSION typedef long long LongLong;
+FMT_GCC_EXTENSION typedef unsigned long long ULongLong;
+
+#if FMT_USE_RVALUE_REFERENCES
+using std::move;
+#endif
+
+template <typename Char>
+class BasicWriter;
+
+typedef BasicWriter<char> Writer;
+typedef BasicWriter<wchar_t> WWriter;
+
+template <typename Char>
+class ArgFormatter;
+
+struct FormatSpec;
+
+template <typename Impl, typename Char, typename Spec = fmt::FormatSpec>
+class BasicPrintfArgFormatter;
+
+template <typename CharType,
+          typename ArgFormatter = fmt::ArgFormatter<CharType> >
+class BasicFormatter;
+
+/**
+  \rst
+  A string reference. It can be constructed from a C string or
+  ``std::basic_string``.
+
+  You can use one of the following typedefs for common character types:
+
+  +------------+-------------------------+
+  | Type       | Definition              |
+  +============+=========================+
+  | StringRef  | BasicStringRef<char>    |
+  +------------+-------------------------+
+  | WStringRef | BasicStringRef<wchar_t> |
+  +------------+-------------------------+
+
+  This class is most useful as a parameter type to allow passing
+  different types of strings to a function, for example::
+
+    template <typename... Args>
+    std::string format(StringRef format_str, const Args & ... args);
+
+    format("{}", 42);
+    format(std::string("{}"), 42);
+  \endrst
+ */
+template <typename Char>
+class BasicStringRef
+{
+private:
+    const Char *data_;
+    std::size_t size_;
+
+public:
+    /** Constructs a string reference object from a C string and a size. */
+    BasicStringRef(const Char *s, std::size_t size) : data_(s), size_(size) {}
+
+    /**
+      \rst
+      Constructs a string reference object from a C string computing
+      the size with ``std::char_traits<Char>::length``.
+      \endrst
+     */
+    BasicStringRef(const Char *s)
+        : data_(s), size_(std::char_traits<Char>::length(s)) {}
+
+    /**
+      \rst
+      Constructs a string reference from a ``std::basic_string`` object.
+      \endrst
+     */
+    template <typename Allocator>
+    BasicStringRef(
+        const std::basic_string<Char, std::char_traits<Char>, Allocator> &s)
+        : data_(s.c_str()), size_(s.size()) {}
+
+    /**
+      \rst
+      Converts a string reference to an ``std::string`` object.
+      \endrst
+     */
+    std::basic_string<Char> to_string() const
+    {
+        return std::basic_string<Char>(data_, size_);
+    }
+
+    /** Returns a pointer to the string data. */
+    const Char *data() const
+    {
+        return data_;
+    }
+
+    /** Returns the string size. */
+    std::size_t size() const
+    {
+        return size_;
+    }
+
+    // Lexicographically compare this string reference to other.
+    int compare(BasicStringRef other) const
+    {
+        std::size_t size = size_ < other.size_ ? size_ : other.size_;
+        int result = std::char_traits<Char>::compare(data_, other.data_, size);
+        if (result == 0)
+            result = size_ == other.size_ ? 0 : (size_ < other.size_ ? -1 : 1);
+        return result;
+    }
+
+    friend bool operator==(BasicStringRef lhs, BasicStringRef rhs)
+    {
+        return lhs.compare(rhs) == 0;
+    }
+    friend bool operator!=(BasicStringRef lhs, BasicStringRef rhs)
+    {
+        return lhs.compare(rhs) != 0;
+    }
+    friend bool operator<(BasicStringRef lhs, BasicStringRef rhs)
+    {
+        return lhs.compare(rhs) < 0;
+    }
+    friend bool operator<=(BasicStringRef lhs, BasicStringRef rhs)
+    {
+        return lhs.compare(rhs) <= 0;
+    }
+    friend bool operator>(BasicStringRef lhs, BasicStringRef rhs)
+    {
+        return lhs.compare(rhs) > 0;
+    }
+    friend bool operator>=(BasicStringRef lhs, BasicStringRef rhs)
+    {
+        return lhs.compare(rhs) >= 0;
+    }
+};
+
+typedef BasicStringRef<char> StringRef;
+typedef BasicStringRef<wchar_t> WStringRef;
+
+/**
+  \rst
+  A reference to a null terminated string. It can be constructed from a C
+  string or ``std::basic_string``.
+
+  You can use one of the following typedefs for common character types:
+
+  +-------------+--------------------------+
+  | Type        | Definition               |
+  +=============+==========================+
+  | CStringRef  | BasicCStringRef<char>    |
+  +-------------+--------------------------+
+  | WCStringRef | BasicCStringRef<wchar_t> |
+  +-------------+--------------------------+
+
+  This class is most useful as a parameter type to allow passing
+  different types of strings to a function, for example::
+
+    template <typename... Args>
+    std::string format(CStringRef format_str, const Args & ... args);
+
+    format("{}", 42);
+    format(std::string("{}"), 42);
+  \endrst
+ */
+template <typename Char>
+class BasicCStringRef
+{
+private:
+    const Char *data_;
+
+public:
+    /** Constructs a string reference object from a C string. */
+    BasicCStringRef(const Char *s) : data_(s) {}
+
+    /**
+      \rst
+      Constructs a string reference from a ``std::basic_string`` object.
+      \endrst
+     */
+    template <typename Allocator>
+    BasicCStringRef(
+        const std::basic_string<Char, std::char_traits<Char>, Allocator> &s)
+        : data_(s.c_str()) {}
+
+    /** Returns the pointer to a C string. */
+    const Char *c_str() const
+    {
+        return data_;
+    }
+};
+
+typedef BasicCStringRef<char> CStringRef;
+typedef BasicCStringRef<wchar_t> WCStringRef;
+
+/** A formatting error such as invalid format string. */
+class FormatError : public std::runtime_error
+{
+public:
+    explicit FormatError(CStringRef message)
+        : std::runtime_error(message.c_str()) {}
+    FormatError(const FormatError &ferr) : std::runtime_error(ferr) {}
+    FMT_API ~FormatError() FMT_DTOR_NOEXCEPT;
+};
+
+namespace internal
+{
+
+// MakeUnsigned<T>::Type gives an unsigned type corresponding to integer type T.
+template <typename T>
+struct MakeUnsigned
+{
+    typedef T Type;
+};
+
+#define FMT_SPECIALIZE_MAKE_UNSIGNED(T, U) \
+  template <> \
+  struct MakeUnsigned<T> { typedef U Type; }
+
+FMT_SPECIALIZE_MAKE_UNSIGNED(char, unsigned char);
+FMT_SPECIALIZE_MAKE_UNSIGNED(signed char, unsigned char);
+FMT_SPECIALIZE_MAKE_UNSIGNED(short, unsigned short);
+FMT_SPECIALIZE_MAKE_UNSIGNED(int, unsigned);
+FMT_SPECIALIZE_MAKE_UNSIGNED(long, unsigned long);
+FMT_SPECIALIZE_MAKE_UNSIGNED(LongLong, ULongLong);
+
+// Casts nonnegative integer to unsigned.
+template <typename Int>
+inline typename MakeUnsigned<Int>::Type to_unsigned(Int value)
+{
+    FMT_ASSERT(value >= 0, "negative value");
+    return static_cast<typename MakeUnsigned<Int>::Type>(value);
+}
+
+// The number of characters to store in the MemoryBuffer object itself
+// to avoid dynamic memory allocation.
+enum { INLINE_BUFFER_SIZE = 500 };
+
+#if FMT_SECURE_SCL
+// Use checked iterator to avoid warnings on MSVC.
+template <typename T>
+inline stdext::checked_array_iterator<T*> make_ptr(T *ptr, std::size_t size)
+{
+    return stdext::checked_array_iterator<T*>(ptr, size);
+}
+#else
+template <typename T>
+inline T *make_ptr(T *ptr, std::size_t)
+{
+    return ptr;
+}
+#endif
+}  // namespace internal
+
+/**
+  \rst
+  A buffer supporting a subset of ``std::vector``'s operations.
+  \endrst
+ */
+template <typename T>
+class Buffer
+{
+private:
+    FMT_DISALLOW_COPY_AND_ASSIGN(Buffer);
+
+protected:
+    T *ptr_;
+    std::size_t size_;
+    std::size_t capacity_;
+
+    Buffer(T *ptr = FMT_NULL, std::size_t capacity = 0)
+        : ptr_(ptr), size_(0), capacity_(capacity) {}
+
+    /**
+      \rst
+      Increases the buffer capacity to hold at least *size* elements updating
+      ``ptr_`` and ``capacity_``.
+      \endrst
+     */
+    virtual void grow(std::size_t size) = 0;
+
+public:
+    virtual ~Buffer() {}
+
+    /** Returns the size of this buffer. */
+    std::size_t size() const
+    {
+        return size_;
+    }
+
+    /** Returns the capacity of this buffer. */
+    std::size_t capacity() const
+    {
+        return capacity_;
+    }
+
+    /**
+      Resizes the buffer. If T is a POD type new elements may not be initialized.
+     */
+    void resize(std::size_t new_size)
+    {
+        if (new_size > capacity_)
+            grow(new_size);
+        size_ = new_size;
+    }
+
+    /**
+      \rst
+      Reserves space to store at least *capacity* elements.
+      \endrst
+     */
+    void reserve(std::size_t capacity)
+    {
+        if (capacity > capacity_)
+            grow(capacity);
+    }
+
+    void clear() FMT_NOEXCEPT { size_ = 0; }
+
+    void push_back(const T &value)
+    {
+        if (size_ == capacity_)
+            grow(size_ + 1);
+        ptr_[size_++] = value;
+    }
+
+    /** Appends data to the end of the buffer. */
+    template <typename U>
+    void append(const U *begin, const U *end);
+
+    T &operator[](std::size_t index)
+    {
+        return ptr_[index];
+    }
+    const T &operator[](std::size_t index) const
+    {
+        return ptr_[index];
+    }
+};
+
+template <typename T>
+template <typename U>
+void Buffer<T>::append(const U *begin, const U *end)
+{
+    FMT_ASSERT(end >= begin, "negative value");
+    std::size_t new_size = size_ + (end - begin);
+    if (new_size > capacity_)
+        grow(new_size);
+    std::uninitialized_copy(begin, end,
+                            internal::make_ptr(ptr_, capacity_) + size_);
+    size_ = new_size;
+}
+
+namespace internal
+{
+
+// A memory buffer for trivially copyable/constructible types with the first
+// SIZE elements stored in the object itself.
+template <typename T, std::size_t SIZE, typename Allocator = std::allocator<T> >
+class MemoryBuffer : private Allocator, public Buffer<T>
+{
+private:
+    T data_[SIZE];
+
+    // Deallocate memory allocated by the buffer.
+    void deallocate()
+    {
+        if (this->ptr_ != data_) Allocator::deallocate(this->ptr_, this->capacity_);
+    }
+
+protected:
+    void grow(std::size_t size) FMT_OVERRIDE;
+
+public:
+    explicit MemoryBuffer(const Allocator &alloc = Allocator())
+        : Allocator(alloc), Buffer<T>(data_, SIZE) {}
+    ~MemoryBuffer()
+    {
+        deallocate();
+    }
+
+#if FMT_USE_RVALUE_REFERENCES
+private:
+    // Move data from other to this buffer.
+    void move(MemoryBuffer &other)
+    {
+        Allocator &this_alloc = *this, &other_alloc = other;
+        this_alloc = std::move(other_alloc);
+        this->size_ = other.size_;
+        this->capacity_ = other.capacity_;
+        if (other.ptr_ == other.data_)
+        {
+            this->ptr_ = data_;
+            std::uninitialized_copy(other.data_, other.data_ + this->size_,
+                                    make_ptr(data_, this->capacity_));
+        }
+        else
+        {
+            this->ptr_ = other.ptr_;
+            // Set pointer to the inline array so that delete is not called
+            // when deallocating.
+            other.ptr_ = other.data_;
+        }
+    }
+
+public:
+    MemoryBuffer(MemoryBuffer &&other)
+    {
+        move(other);
+    }
+
+    MemoryBuffer &operator=(MemoryBuffer &&other)
+    {
+        assert(this != &other);
+        deallocate();
+        move(other);
+        return *this;
+    }
+#endif
+
+    // Returns a copy of the allocator associated with this buffer.
+    Allocator get_allocator() const
+    {
+        return *this;
+    }
+};
+
+template <typename T, std::size_t SIZE, typename Allocator>
+void MemoryBuffer<T, SIZE, Allocator>::grow(std::size_t size)
+{
+    std::size_t new_capacity = this->capacity_ + this->capacity_ / 2;
+    if (size > new_capacity)
+        new_capacity = size;
+    T *new_ptr = this->allocate(new_capacity, FMT_NULL);
+    // The following code doesn't throw, so the raw pointer above doesn't leak.
+    std::uninitialized_copy(this->ptr_, this->ptr_ + this->size_,
+                            make_ptr(new_ptr, new_capacity));
+    std::size_t old_capacity = this->capacity_;
+    T *old_ptr = this->ptr_;
+    this->capacity_ = new_capacity;
+    this->ptr_ = new_ptr;
+    // deallocate may throw (at least in principle), but it doesn't matter since
+    // the buffer already uses the new storage and will deallocate it in case
+    // of exception.
+    if (old_ptr != data_)
+        Allocator::deallocate(old_ptr, old_capacity);
+}
+
+// A fixed-size buffer.
+template <typename Char>
+class FixedBuffer : public fmt::Buffer<Char>
+{
+public:
+    FixedBuffer(Char *array, std::size_t size) : fmt::Buffer<Char>(array, size) {}
+
+protected:
+    FMT_API void grow(std::size_t size) FMT_OVERRIDE;
+};
+
+template <typename Char>
+class BasicCharTraits
+{
+public:
+#if FMT_SECURE_SCL
+    typedef stdext::checked_array_iterator<Char*> CharPtr;
+#else
+    typedef Char *CharPtr;
+#endif
+    static Char cast(int value)
+    {
+        return static_cast<Char>(value);
+    }
+};
+
+template <typename Char>
+class CharTraits;
+
+template <>
+class CharTraits<char> : public BasicCharTraits<char>
+{
+private:
+    // Conversion from wchar_t to char is not allowed.
+    static char convert(wchar_t);
+
+public:
+    static char convert(char value)
+    {
+        return value;
+    }
+
+    // Formats a floating-point number.
+    template <typename T>
+    FMT_API static int format_float(char *buffer, std::size_t size,
+                                    const char *format, unsigned width, int precision, T value);
+};
+
+#if FMT_USE_EXTERN_TEMPLATES
+extern template int CharTraits<char>::format_float<double>
+(char *buffer, std::size_t size,
+ const char* format, unsigned width, int precision, double value);
+extern template int CharTraits<char>::format_float<long double>
+(char *buffer, std::size_t size,
+ const char* format, unsigned width, int precision, long double value);
+#endif
+
+template <>
+class CharTraits<wchar_t> : public BasicCharTraits<wchar_t>
+{
+public:
+    static wchar_t convert(char value)
+    {
+        return value;
+    }
+    static wchar_t convert(wchar_t value)
+    {
+        return value;
+    }
+
+    template <typename T>
+    FMT_API static int format_float(wchar_t *buffer, std::size_t size,
+                                    const wchar_t *format, unsigned width, int precision, T value);
+};
+
+#if FMT_USE_EXTERN_TEMPLATES
+extern template int CharTraits<wchar_t>::format_float<double>
+(wchar_t *buffer, std::size_t size,
+ const wchar_t* format, unsigned width, int precision, double value);
+extern template int CharTraits<wchar_t>::format_float<long double>
+(wchar_t *buffer, std::size_t size,
+ const wchar_t* format, unsigned width, int precision, long double value);
+#endif
+
+// Checks if a number is negative - used to avoid warnings.
+template <bool IsSigned>
+struct SignChecker
+{
+    template <typename T>
+    static bool is_negative(T value)
+    {
+        return value < 0;
+    }
+};
+
+template <>
+struct SignChecker<false>
+{
+    template <typename T>
+    static bool is_negative(T)
+    {
+        return false;
+    }
+};
+
+// Returns true if value is negative, false otherwise.
+// Same as (value < 0) but doesn't produce warnings if T is an unsigned type.
+template <typename T>
+inline bool is_negative(T value)
+{
+    return SignChecker<std::numeric_limits<T>::is_signed>::is_negative(value);
+}
+
+// Selects uint32_t if FitsIn32Bits is true, uint64_t otherwise.
+template <bool FitsIn32Bits>
+struct TypeSelector
+{
+    typedef uint32_t Type;
+};
+
+template <>
+struct TypeSelector<false>
+{
+    typedef uint64_t Type;
+};
+
+template <typename T>
+struct IntTraits
+{
+    // Smallest of uint32_t and uint64_t that is large enough to represent
+    // all values of T.
+    typedef typename
+    TypeSelector<std::numeric_limits<T>::digits <= 32>::Type MainType;
+};
+
+FMT_API void report_unknown_type(char code, const char *type);
+
+// Static data is placed in this class template to allow header-only
+// configuration.
+template <typename T = void>
+struct FMT_API BasicData
+{
+    static const uint32_t POWERS_OF_10_32[];
+    static const uint64_t POWERS_OF_10_64[];
+    static const char DIGITS[];
+};
+
+#if FMT_USE_EXTERN_TEMPLATES
+extern template struct BasicData<void>;
+#endif
+
+typedef BasicData<> Data;
+
+#ifdef FMT_BUILTIN_CLZLL
+// Returns the number of decimal digits in n. Leading zeros are not counted
+// except for n == 0 in which case count_digits returns 1.
+inline unsigned count_digits(uint64_t n)
+{
+    // Based on http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
+    // and the benchmark https://github.com/localvoid/cxx-benchmark-count-digits.
+    int t = (64 - FMT_BUILTIN_CLZLL(n | 1)) * 1233 >> 12;
+    return to_unsigned(t) - (n < Data::POWERS_OF_10_64[t]) + 1;
+}
+#else
+// Fallback version of count_digits used when __builtin_clz is not available.
+inline unsigned count_digits(uint64_t n)
+{
+    unsigned count = 1;
+    for (;;)
+    {
+        // Integer division is slow so do it for a group of four digits instead
+        // of for every digit. The idea comes from the talk by Alexandrescu
+        // "Three Optimization Tips for C++". See speed-test for a comparison.
+        if (n < 10) return count;
+        if (n < 100) return count + 1;
+        if (n < 1000) return count + 2;
+        if (n < 10000) return count + 3;
+        n /= 10000u;
+        count += 4;
+    }
+}
+#endif
+
+#ifdef FMT_BUILTIN_CLZ
+// Optional version of count_digits for better performance on 32-bit platforms.
+inline unsigned count_digits(uint32_t n)
+{
+    int t = (32 - FMT_BUILTIN_CLZ(n | 1)) * 1233 >> 12;
+    return to_unsigned(t) - (n < Data::POWERS_OF_10_32[t]) + 1;
+}
+#endif
+
+// A functor that doesn't add a thousands separator.
+struct NoThousandsSep
+{
+    template <typename Char>
+    void operator()(Char *) {}
+};
+
+// A functor that adds a thousands separator.
+class ThousandsSep
+{
+private:
+    fmt::StringRef sep_;
+
+    // Index of a decimal digit with the least significant digit having index 0.
+    unsigned digit_index_;
+
+public:
+    explicit ThousandsSep(fmt::StringRef sep) : sep_(sep), digit_index_(0) {}
+
+    template <typename Char>
+    void operator()(Char *&buffer)
+    {
+        if (++digit_index_ % 3 != 0)
+            return;
+        buffer -= sep_.size();
+        std::uninitialized_copy(sep_.data(), sep_.data() + sep_.size(),
+                                internal::make_ptr(buffer, sep_.size()));
+    }
+};
+
+// Formats a decimal unsigned integer value writing into buffer.
+// thousands_sep is a functor that is called after writing each char to
+// add a thousands separator if necessary.
+template <typename UInt, typename Char, typename ThousandsSep>
+inline void format_decimal(Char *buffer, UInt value, unsigned num_digits,
+                           ThousandsSep thousands_sep)
+{
+    buffer += num_digits;
+    while (value >= 100)
+    {
+        // Integer division is slow so do it for a group of two digits instead
+        // of for every digit. The idea comes from the talk by Alexandrescu
+        // "Three Optimization Tips for C++". See speed-test for a comparison.
+        unsigned index = static_cast<unsigned>((value % 100) * 2);
+        value /= 100;
+        *--buffer = Data::DIGITS[index + 1];
+        thousands_sep(buffer);
+        *--buffer = Data::DIGITS[index];
+        thousands_sep(buffer);
+    }
+    if (value < 10)
+    {
+        *--buffer = static_cast<char>('0' + value);
+        return;
+    }
+    unsigned index = static_cast<unsigned>(value * 2);
+    *--buffer = Data::DIGITS[index + 1];
+    thousands_sep(buffer);
+    *--buffer = Data::DIGITS[index];
+}
+
+template <typename UInt, typename Char>
+inline void format_decimal(Char *buffer, UInt value, unsigned num_digits)
+{
+    format_decimal(buffer, value, num_digits, NoThousandsSep());
+    return;
+}
+
+#ifndef _WIN32
+# define FMT_USE_WINDOWS_H 0
+#elif !defined(FMT_USE_WINDOWS_H)
+# define FMT_USE_WINDOWS_H 1
+#endif
+
+// Define FMT_USE_WINDOWS_H to 0 to disable use of windows.h.
+// All the functionality that relies on it will be disabled too.
+#if FMT_USE_WINDOWS_H
+// A converter from UTF-8 to UTF-16.
+// It is only provided for Windows since other systems support UTF-8 natively.
+class UTF8ToUTF16
+{
+private:
+    MemoryBuffer<wchar_t, INLINE_BUFFER_SIZE> buffer_;
+
+public:
+    FMT_API explicit UTF8ToUTF16(StringRef s);
+    operator WStringRef() const
+    {
+        return WStringRef(&buffer_[0], size());
+    }
+    size_t size() const
+    {
+        return buffer_.size() - 1;
+    }
+    const wchar_t *c_str() const
+    {
+        return &buffer_[0];
+    }
+    std::wstring str() const
+    {
+        return std::wstring(&buffer_[0], size());
+    }
+};
+
+// A converter from UTF-16 to UTF-8.
+// It is only provided for Windows since other systems support UTF-8 natively.
+class UTF16ToUTF8
+{
+private:
+    MemoryBuffer<char, INLINE_BUFFER_SIZE> buffer_;
+
+public:
+    UTF16ToUTF8() {}
+    FMT_API explicit UTF16ToUTF8(WStringRef s);
+    operator StringRef() const
+    {
+        return StringRef(&buffer_[0], size());
+    }
+    size_t size() const
+    {
+        return buffer_.size() - 1;
+    }
+    const char *c_str() const
+    {
+        return &buffer_[0];
+    }
+    std::string str() const
+    {
+        return std::string(&buffer_[0], size());
+    }
+
+    // Performs conversion returning a system error code instead of
+    // throwing exception on conversion error. This method may still throw
+    // in case of memory allocation error.
+    FMT_API int convert(WStringRef s);
+};
+
+FMT_API void format_windows_error(fmt::Writer &out, int error_code,
+                                  fmt::StringRef message) FMT_NOEXCEPT;
+#endif
+
+// A formatting argument value.
+struct Value
+{
+    template <typename Char>
+    struct StringValue
+    {
+        const Char *value;
+        std::size_t size;
+    };
+
+    typedef void (*FormatFunc)(
+        void *formatter, const void *arg, void *format_str_ptr);
+
+    struct CustomValue
+    {
+        const void *value;
+        FormatFunc format;
+    };
+
+    union
+    {
+        int int_value;
+        unsigned uint_value;
+        LongLong long_long_value;
+        ULongLong ulong_long_value;
+        double double_value;
+        long double long_double_value;
+        const void *pointer;
+        StringValue<char> string;
+        StringValue<signed char> sstring;
+        StringValue<unsigned char> ustring;
+        StringValue<wchar_t> wstring;
+        CustomValue custom;
+    };
+
+    enum Type
+    {
+        NONE, NAMED_ARG,
+        // Integer types should go first,
+        INT, UINT, LONG_LONG, ULONG_LONG, BOOL, CHAR, LAST_INTEGER_TYPE = CHAR,
+        // followed by floating-point types.
+        DOUBLE, LONG_DOUBLE, LAST_NUMERIC_TYPE = LONG_DOUBLE,
+        CSTRING, STRING, WSTRING, POINTER, CUSTOM
+    };
+};
+
+// A formatting argument. It is a trivially copyable/constructible type to
+// allow storage in internal::MemoryBuffer.
+struct Arg : Value
+{
+    Type type;
+};
+
+template <typename Char>
+struct NamedArg;
+template <typename Char, typename T>
+struct NamedArgWithType;
+
+template <typename T = void>
+struct Null {};
+
+// A helper class template to enable or disable overloads taking wide
+// characters and strings in MakeValue.
+template <typename T, typename Char>
+struct WCharHelper
+{
+    typedef Null<T> Supported;
+    typedef T Unsupported;
+};
+
+template <typename T>
+struct WCharHelper<T, wchar_t>
+{
+    typedef T Supported;
+    typedef Null<T> Unsupported;
+};
+
+typedef char Yes[1];
+typedef char No[2];
+
+template <typename T>
+T &get();
+
+// These are non-members to workaround an overload resolution bug in bcc32.
+Yes &convert(fmt::ULongLong);
+No &convert(...);
+
+template<typename T, bool ENABLE_CONVERSION>
+struct ConvertToIntImpl
+{
+    enum { value = ENABLE_CONVERSION };
+};
+
+template<typename T, bool ENABLE_CONVERSION>
+struct ConvertToIntImpl2
+{
+    enum { value = false };
+};
+
+template<typename T>
+struct ConvertToIntImpl2<T, true>
+{
+    enum
+    {
+        // Don't convert numeric types.
+        value = ConvertToIntImpl<T, !std::numeric_limits<T>::is_specialized>::value
+    };
+};
+
+template<typename T>
+struct ConvertToInt
+{
+    enum
+    {
+        enable_conversion = sizeof(fmt::internal::convert(get<T>())) == sizeof(Yes)
+    };
+    enum { value = ConvertToIntImpl2<T, enable_conversion>::value };
+};
+
+#define FMT_DISABLE_CONVERSION_TO_INT(Type) \
+  template <> \
+  struct ConvertToInt<Type> {  enum { value = 0 }; }
+
+// Silence warnings about convering float to int.
+FMT_DISABLE_CONVERSION_TO_INT(float);
+FMT_DISABLE_CONVERSION_TO_INT(double);
+FMT_DISABLE_CONVERSION_TO_INT(long double);
+
+template<bool B, class T = void>
+struct EnableIf {};
+
+template<class T>
+struct EnableIf<true, T>
+{
+    typedef T type;
+};
+
+template<bool B, class T, class F>
+struct Conditional
+{
+    typedef T type;
+};
+
+template<class T, class F>
+struct Conditional<false, T, F>
+{
+    typedef F type;
+};
+
+// For bcc32 which doesn't understand ! in template arguments.
+template <bool>
+struct Not
+{
+    enum { value = 0 };
+};
+
+template <>
+struct Not<false>
+{
+    enum { value = 1 };
+};
+
+template <typename T>
+struct FalseType
+{
+    enum { value = 0 };
+};
+
+template <typename T, T> struct LConvCheck
+{
+    LConvCheck(int) {}
+};
+
+// Returns the thousands separator for the current locale.
+// We check if ``lconv`` contains ``thousands_sep`` because on Android
+// ``lconv`` is stubbed as an empty struct.
+template <typename LConv>
+inline StringRef thousands_sep(
+    LConv *lc, LConvCheck<char *LConv::*, &LConv::thousands_sep> = 0)
+{
+    return lc->thousands_sep;
+}
+
+inline fmt::StringRef thousands_sep(...)
+{
+    return "";
+}
+
+#define FMT_CONCAT(a, b) a##b
+
+#if FMT_GCC_VERSION >= 303
+# define FMT_UNUSED __attribute__((unused))
+#else
+# define FMT_UNUSED
+#endif
+
+#ifndef FMT_USE_STATIC_ASSERT
+# define FMT_USE_STATIC_ASSERT 0
+#endif
+
+#if FMT_USE_STATIC_ASSERT || FMT_HAS_FEATURE(cxx_static_assert) || \
+  (FMT_GCC_VERSION >= 403 && FMT_HAS_GXX_CXX11) || _MSC_VER >= 1600
+# define FMT_STATIC_ASSERT(cond, message) static_assert(cond, message)
+#else
+# define FMT_CONCAT_(a, b) FMT_CONCAT(a, b)
+# define FMT_STATIC_ASSERT(cond, message) \
+  typedef int FMT_CONCAT_(Assert, __LINE__)[(cond) ? 1 : -1] FMT_UNUSED
+#endif
+
+template <typename Formatter, typename Char, typename T>
+void format_arg(Formatter &, const Char *, const T &)
+{
+    FMT_STATIC_ASSERT(FalseType<T>::value,
+                      "Cannot format argument. To enable the use of ostream "
+                      "operator<< include fmt/ostream.h. Otherwise provide "
+                      "an overload of format_arg.");
+}
+
+// Makes an Arg object from any type.
+template <typename Formatter>
+class MakeValue : public Arg
+{
+public:
+    typedef typename Formatter::Char Char;
+
+private:
+    // The following two methods are private to disallow formatting of
+    // arbitrary pointers. If you want to output a pointer cast it to
+    // "void *" or "const void *". In particular, this forbids formatting
+    // of "[const] volatile char *" which is printed as bool by iostreams.
+    // Do not implement!
+    template <typename T>
+    MakeValue(const T *value);
+    template <typename T>
+    MakeValue(T *value);
+
+    // The following methods are private to disallow formatting of wide
+    // characters and strings into narrow strings as in
+    //   fmt::format("{}", L"test");
+    // To fix this, use a wide format string: fmt::format(L"{}", L"test").
+#if !FMT_MSC_VER || defined(_NATIVE_WCHAR_T_DEFINED)
+    MakeValue(typename WCharHelper<wchar_t, Char>::Unsupported);
+#endif
+    MakeValue(typename WCharHelper<wchar_t *, Char>::Unsupported);
+    MakeValue(typename WCharHelper<const wchar_t *, Char>::Unsupported);
+    MakeValue(typename WCharHelper<const std::wstring &, Char>::Unsupported);
+    MakeValue(typename WCharHelper<WStringRef, Char>::Unsupported);
+
+    void set_string(StringRef str)
+    {
+        string.value = str.data();
+        string.size = str.size();
+    }
+
+    void set_string(WStringRef str)
+    {
+        wstring.value = str.data();
+        wstring.size = str.size();
+    }
+
+    // Formats an argument of a custom type, such as a user-defined class.
+    template <typename T>
+    static void format_custom_arg(
+        void *formatter, const void *arg, void *format_str_ptr)
+    {
+        format_arg(*static_cast<Formatter*>(formatter),
+                   *static_cast<const Char**>(format_str_ptr),
+                   *static_cast<const T*>(arg));
+    }
+
+public:
+    MakeValue() {}
+
+#define FMT_MAKE_VALUE_(Type, field, TYPE, rhs) \
+  MakeValue(Type value) { field = rhs; } \
+  static uint64_t type(Type) { return Arg::TYPE; }
+
+#define FMT_MAKE_VALUE(Type, field, TYPE) \
+  FMT_MAKE_VALUE_(Type, field, TYPE, value)
+
+    FMT_MAKE_VALUE(bool, int_value, BOOL)
+    FMT_MAKE_VALUE(short, int_value, INT)
+    FMT_MAKE_VALUE(unsigned short, uint_value, UINT)
+    FMT_MAKE_VALUE(int, int_value, INT)
+    FMT_MAKE_VALUE(unsigned, uint_value, UINT)
+
+    MakeValue(long value)
+    {
+        // To minimize the number of types we need to deal with, long is
+        // translated either to int or to long long depending on its size.
+        if (const_check(sizeof(long) == sizeof(int)))
+            int_value = static_cast<int>(value);
+        else
+            long_long_value = value;
+    }
+    static uint64_t type(long)
+    {
+        return sizeof(long) == sizeof(int) ? Arg::INT : Arg::LONG_LONG;
+    }
+
+    MakeValue(unsigned long value)
+    {
+        if (const_check(sizeof(unsigned long) == sizeof(unsigned)))
+            uint_value = static_cast<unsigned>(value);
+        else
+            ulong_long_value = value;
+    }
+    static uint64_t type(unsigned long)
+    {
+        return sizeof(unsigned long) == sizeof(unsigned) ?
+               Arg::UINT : Arg::ULONG_LONG;
+    }
+
+    FMT_MAKE_VALUE(LongLong, long_long_value, LONG_LONG)
+    FMT_MAKE_VALUE(ULongLong, ulong_long_value, ULONG_LONG)
+    FMT_MAKE_VALUE(float, double_value, DOUBLE)
+    FMT_MAKE_VALUE(double, double_value, DOUBLE)
+    FMT_MAKE_VALUE(long double, long_double_value, LONG_DOUBLE)
+    FMT_MAKE_VALUE(signed char, int_value, INT)
+    FMT_MAKE_VALUE(unsigned char, uint_value, UINT)
+    FMT_MAKE_VALUE(char, int_value, CHAR)
+
+#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED)
+    MakeValue(typename WCharHelper<wchar_t, Char>::Supported value)
+    {
+        int_value = value;
+    }
+    static uint64_t type(wchar_t)
+    {
+        return Arg::CHAR;
+    }
+#endif
+
+#define FMT_MAKE_STR_VALUE(Type, TYPE) \
+  MakeValue(Type value) { set_string(value); } \
+  static uint64_t type(Type) { return Arg::TYPE; }
+
+    FMT_MAKE_VALUE(char *, string.value, CSTRING)
+    FMT_MAKE_VALUE(const char *, string.value, CSTRING)
+    FMT_MAKE_VALUE(signed char *, sstring.value, CSTRING)
+    FMT_MAKE_VALUE(const signed char *, sstring.value, CSTRING)
+    FMT_MAKE_VALUE(unsigned char *, ustring.value, CSTRING)
+    FMT_MAKE_VALUE(const unsigned char *, ustring.value, CSTRING)
+    FMT_MAKE_STR_VALUE(const std::string &, STRING)
+    FMT_MAKE_STR_VALUE(StringRef, STRING)
+    FMT_MAKE_VALUE_(CStringRef, string.value, CSTRING, value.c_str())
+
+#define FMT_MAKE_WSTR_VALUE(Type, TYPE) \
+  MakeValue(typename WCharHelper<Type, Char>::Supported value) { \
+    set_string(value); \
+  } \
+  static uint64_t type(Type) { return Arg::TYPE; }
+
+    FMT_MAKE_WSTR_VALUE(wchar_t *, WSTRING)
+    FMT_MAKE_WSTR_VALUE(const wchar_t *, WSTRING)
+    FMT_MAKE_WSTR_VALUE(const std::wstring &, WSTRING)
+    FMT_MAKE_WSTR_VALUE(WStringRef, WSTRING)
+
+    FMT_MAKE_VALUE(void *, pointer, POINTER)
+    FMT_MAKE_VALUE(const void *, pointer, POINTER)
+
+    template <typename T>
+    MakeValue(const T &value,
+              typename EnableIf<Not<
+              ConvertToInt<T>::value>::value, int>::type = 0)
+    {
+        custom.value = &value;
+        custom.format = &format_custom_arg<T>;
+    }
+
+    template <typename T>
+    static typename EnableIf<Not<ConvertToInt<T>::value>::value, uint64_t>::type
+    type(const T &)
+    {
+        return Arg::CUSTOM;
+    }
+
+    // Additional template param `Char_` is needed here because make_type always
+    // uses char.
+    template <typename Char_>
+    MakeValue(const NamedArg<Char_> &value)
+    {
+        pointer = &value;
+    }
+    template <typename Char_, typename T>
+    MakeValue(const NamedArgWithType<Char_, T> &value)
+    {
+        pointer = &value;
+    }
+
+    template <typename Char_>
+    static uint64_t type(const NamedArg<Char_> &)
+    {
+        return Arg::NAMED_ARG;
+    }
+    template <typename Char_, typename T>
+    static uint64_t type(const NamedArgWithType<Char_, T> &)
+    {
+        return Arg::NAMED_ARG;
+    }
+};
+
+template <typename Formatter>
+class MakeArg : public Arg
+{
+public:
+    MakeArg()
+    {
+        type = Arg::NONE;
+    }
+
+    template <typename T>
+    MakeArg(const T &value)
+        : Arg(MakeValue<Formatter>(value))
+    {
+        type = static_cast<Arg::Type>(MakeValue<Formatter>::type(value));
+    }
+};
+
+template <typename Char>
+struct NamedArg : Arg
+{
+    BasicStringRef<Char> name;
+
+    template <typename T>
+    NamedArg(BasicStringRef<Char> argname, const T &value)
+        : Arg(MakeArg< BasicFormatter<Char> >(value)), name(argname) {}
+};
+
+template <typename Char, typename T>
+struct NamedArgWithType : NamedArg<Char>
+{
+    NamedArgWithType(BasicStringRef<Char> argname, const T &value)
+        : NamedArg<Char>(argname, value) {}
+};
+
+class RuntimeError : public std::runtime_error
+{
+protected:
+    RuntimeError() : std::runtime_error("") {}
+    RuntimeError(const RuntimeError &rerr) : std::runtime_error(rerr) {}
+    FMT_API ~RuntimeError() FMT_DTOR_NOEXCEPT;
+};
+
+template <typename Char>
+class ArgMap;
+}  // namespace internal
+
+/** An argument list. */
+class ArgList
+{
+private:
+    // To reduce compiled code size per formatting function call, types of first
+    // MAX_PACKED_ARGS arguments are passed in the types_ field.
+    uint64_t types_;
+    union
+    {
+        // If the number of arguments is less than MAX_PACKED_ARGS, the argument
+        // values are stored in values_, otherwise they are stored in args_.
+        // This is done to reduce compiled code size as storing larger objects
+        // may require more code (at least on x86-64) even if the same amount of
+        // data is actually copied to stack. It saves ~10% on the bloat test.
+        const internal::Value *values_;
+        const internal::Arg *args_;
+    };
+
+    internal::Arg::Type type(unsigned index) const
+    {
+        return type(types_, index);
+    }
+
+    template <typename Char>
+    friend class internal::ArgMap;
+
+public:
+    // Maximum number of arguments with packed types.
+    enum { MAX_PACKED_ARGS = 16 };
+
+    ArgList() : types_(0) {}
+
+    ArgList(ULongLong types, const internal::Value *values)
+        : types_(types), values_(values) {}
+    ArgList(ULongLong types, const internal::Arg *args)
+        : types_(types), args_(args) {}
+
+    uint64_t types() const
+    {
+        return types_;
+    }
+
+    /** Returns the argument at specified index. */
+    internal::Arg operator[](unsigned index) const
+    {
+        using internal::Arg;
+        Arg arg;
+        bool use_values = type(MAX_PACKED_ARGS - 1) == Arg::NONE;
+        if (index < MAX_PACKED_ARGS)
+        {
+            Arg::Type arg_type = type(index);
+            internal::Value &val = arg;
+            if (arg_type != Arg::NONE)
+                val = use_values ? values_[index] : args_[index];
+            arg.type = arg_type;
+            return arg;
+        }
+        if (use_values)
+        {
+            // The index is greater than the number of arguments that can be stored
+            // in values, so return a "none" argument.
+            arg.type = Arg::NONE;
+            return arg;
+        }
+        for (unsigned i = MAX_PACKED_ARGS; i <= index; ++i)
+        {
+            if (args_[i].type == Arg::NONE)
+                return args_[i];
+        }
+        return args_[index];
+    }
+
+    static internal::Arg::Type type(uint64_t types, unsigned index)
+    {
+        unsigned shift = index * 4;
+        uint64_t mask = 0xf;
+        return static_cast<internal::Arg::Type>(
+                   (types & (mask << shift)) >> shift);
+    }
+};
+
+#define FMT_DISPATCH(call) static_cast<Impl*>(this)->call
+
+/**
+  \rst
+  An argument visitor based on the `curiously recurring template pattern
+  <http://en.wikipedia.org/wiki/Curiously_recurring_template_pattern>`_.
+
+  To use `~fmt::ArgVisitor` define a subclass that implements some or all of the
+  visit methods with the same signatures as the methods in `~fmt::ArgVisitor`,
+  for example, `~fmt::ArgVisitor::visit_int()`.
+  Pass the subclass as the *Impl* template parameter. Then calling
+  `~fmt::ArgVisitor::visit` for some argument will dispatch to a visit method
+  specific to the argument type. For example, if the argument type is
+  ``double`` then the `~fmt::ArgVisitor::visit_double()` method of a subclass
+  will be called. If the subclass doesn't contain a method with this signature,
+  then a corresponding method of `~fmt::ArgVisitor` will be called.
+
+  **Example**::
+
+    class MyArgVisitor : public fmt::ArgVisitor<MyArgVisitor, void> {
+     public:
+      void visit_int(int value) { fmt::print("{}", value); }
+      void visit_double(double value) { fmt::print("{}", value ); }
+    };
+  \endrst
+ */
+template <typename Impl, typename Result>
+class ArgVisitor
+{
+private:
+    typedef internal::Arg Arg;
+
+public:
+    void report_unhandled_arg() {}
+
+    Result visit_unhandled_arg()
+    {
+        FMT_DISPATCH(report_unhandled_arg());
+        return Result();
+    }
+
+    /** Visits an ``int`` argument. **/
+    Result visit_int(int value)
+    {
+        return FMT_DISPATCH(visit_any_int(value));
+    }
+
+    /** Visits a ``long long`` argument. **/
+    Result visit_long_long(LongLong value)
+    {
+        return FMT_DISPATCH(visit_any_int(value));
+    }
+
+    /** Visits an ``unsigned`` argument. **/
+    Result visit_uint(unsigned value)
+    {
+        return FMT_DISPATCH(visit_any_int(value));
+    }
+
+    /** Visits an ``unsigned long long`` argument. **/
+    Result visit_ulong_long(ULongLong value)
+    {
+        return FMT_DISPATCH(visit_any_int(value));
+    }
+
+    /** Visits a ``bool`` argument. **/
+    Result visit_bool(bool value)
+    {
+        return FMT_DISPATCH(visit_any_int(value));
+    }
+
+    /** Visits a ``char`` or ``wchar_t`` argument. **/
+    Result visit_char(int value)
+    {
+        return FMT_DISPATCH(visit_any_int(value));
+    }
+
+    /** Visits an argument of any integral type. **/
+    template <typename T>
+    Result visit_any_int(T)
+    {
+        return FMT_DISPATCH(visit_unhandled_arg());
+    }
+
+    /** Visits a ``double`` argument. **/
+    Result visit_double(double value)
+    {
+        return FMT_DISPATCH(visit_any_double(value));
+    }
+
+    /** Visits a ``long double`` argument. **/
+    Result visit_long_double(long double value)
+    {
+        return FMT_DISPATCH(visit_any_double(value));
+    }
+
+    /** Visits a ``double`` or ``long double`` argument. **/
+    template <typename T>
+    Result visit_any_double(T)
+    {
+        return FMT_DISPATCH(visit_unhandled_arg());
+    }
+
+    /** Visits a null-terminated C string (``const char *``) argument. **/
+    Result visit_cstring(const char *)
+    {
+        return FMT_DISPATCH(visit_unhandled_arg());
+    }
+
+    /** Visits a string argument. **/
+    Result visit_string(Arg::StringValue<char>)
+    {
+        return FMT_DISPATCH(visit_unhandled_arg());
+    }
+
+    /** Visits a wide string argument. **/
+    Result visit_wstring(Arg::StringValue<wchar_t>)
+    {
+        return FMT_DISPATCH(visit_unhandled_arg());
+    }
+
+    /** Visits a pointer argument. **/
+    Result visit_pointer(const void *)
+    {
+        return FMT_DISPATCH(visit_unhandled_arg());
+    }
+
+    /** Visits an argument of a custom (user-defined) type. **/
+    Result visit_custom(Arg::CustomValue)
+    {
+        return FMT_DISPATCH(visit_unhandled_arg());
+    }
+
+    /**
+      \rst
+      Visits an argument dispatching to the appropriate visit method based on
+      the argument type. For example, if the argument type is ``double`` then
+      the `~fmt::ArgVisitor::visit_double()` method of the *Impl* class will be
+      called.
+      \endrst
+     */
+    Result visit(const Arg &arg)
+    {
+        switch (arg.type)
+        {
+        case Arg::NONE:
+        case Arg::NAMED_ARG:
+            FMT_ASSERT(false, "invalid argument type");
+            break;
+        case Arg::INT:
+            return FMT_DISPATCH(visit_int(arg.int_value));
+        case Arg::UINT:
+            return FMT_DISPATCH(visit_uint(arg.uint_value));
+        case Arg::LONG_LONG:
+            return FMT_DISPATCH(visit_long_long(arg.long_long_value));
+        case Arg::ULONG_LONG:
+            return FMT_DISPATCH(visit_ulong_long(arg.ulong_long_value));
+        case Arg::BOOL:
+            return FMT_DISPATCH(visit_bool(arg.int_value != 0));
+        case Arg::CHAR:
+            return FMT_DISPATCH(visit_char(arg.int_value));
+        case Arg::DOUBLE:
+            return FMT_DISPATCH(visit_double(arg.double_value));
+        case Arg::LONG_DOUBLE:
+            return FMT_DISPATCH(visit_long_double(arg.long_double_value));
+        case Arg::CSTRING:
+            return FMT_DISPATCH(visit_cstring(arg.string.value));
+        case Arg::STRING:
+            return FMT_DISPATCH(visit_string(arg.string));
+        case Arg::WSTRING:
+            return FMT_DISPATCH(visit_wstring(arg.wstring));
+        case Arg::POINTER:
+            return FMT_DISPATCH(visit_pointer(arg.pointer));
+        case Arg::CUSTOM:
+            return FMT_DISPATCH(visit_custom(arg.custom));
+        }
+        return Result();
+    }
+};
+
+enum Alignment
+{
+    ALIGN_DEFAULT, ALIGN_LEFT, ALIGN_RIGHT, ALIGN_CENTER, ALIGN_NUMERIC
+};
+
+// Flags.
+enum
+{
+    SIGN_FLAG = 1, PLUS_FLAG = 2, MINUS_FLAG = 4, HASH_FLAG = 8,
+    CHAR_FLAG = 0x10  // Argument has char type - used in error reporting.
+};
+
+// An empty format specifier.
+struct EmptySpec {};
+
+// A type specifier.
+template <char TYPE>
+struct TypeSpec : EmptySpec
+{
+    Alignment align() const
+    {
+        return ALIGN_DEFAULT;
+    }
+    unsigned width() const
+    {
+        return 0;
+    }
+    int precision() const
+    {
+        return -1;
+    }
+    bool flag(unsigned) const
+    {
+        return false;
+    }
+    char type() const
+    {
+        return TYPE;
+    }
+    char type_prefix() const
+    {
+        return TYPE;
+    }
+    char fill() const
+    {
+        return ' ';
+    }
+};
+
+// A width specifier.
+struct WidthSpec
+{
+    unsigned width_;
+    // Fill is always wchar_t and cast to char if necessary to avoid having
+    // two specialization of WidthSpec and its subclasses.
+    wchar_t fill_;
+
+    WidthSpec(unsigned width, wchar_t fill) : width_(width), fill_(fill) {}
+
+    unsigned width() const
+    {
+        return width_;
+    }
+    wchar_t fill() const
+    {
+        return fill_;
+    }
+};
+
+// An alignment specifier.
+struct AlignSpec : WidthSpec
+{
+    Alignment align_;
+
+    AlignSpec(unsigned width, wchar_t fill, Alignment align = ALIGN_DEFAULT)
+        : WidthSpec(width, fill), align_(align) {}
+
+    Alignment align() const
+    {
+        return align_;
+    }
+
+    int precision() const
+    {
+        return -1;
+    }
+};
+
+// An alignment and type specifier.
+template <char TYPE>
+struct AlignTypeSpec : AlignSpec
+{
+    AlignTypeSpec(unsigned width, wchar_t fill) : AlignSpec(width, fill) {}
+
+    bool flag(unsigned) const
+    {
+        return false;
+    }
+    char type() const
+    {
+        return TYPE;
+    }
+    char type_prefix() const
+    {
+        return TYPE;
+    }
+};
+
+// A full format specifier.
+struct FormatSpec : AlignSpec
+{
+    unsigned flags_;
+    int precision_;
+    char type_;
+
+    FormatSpec(
+        unsigned width = 0, char type = 0, wchar_t fill = ' ')
+        : AlignSpec(width, fill), flags_(0), precision_(-1), type_(type) {}
+
+    bool flag(unsigned f) const
+    {
+        return (flags_ & f) != 0;
+    }
+    int precision() const
+    {
+        return precision_;
+    }
+    char type() const
+    {
+        return type_;
+    }
+    char type_prefix() const
+    {
+        return type_;
+    }
+};
+
+// An integer format specifier.
+template <typename T, typename SpecT = TypeSpec<0>, typename Char = char>
+class IntFormatSpec : public SpecT
+{
+private:
+    T value_;
+
+public:
+    IntFormatSpec(T val, const SpecT &spec = SpecT())
+        : SpecT(spec), value_(val) {}
+
+    T value() const
+    {
+        return value_;
+    }
+};
+
+// A string format specifier.
+template <typename Char>
+class StrFormatSpec : public AlignSpec
+{
+private:
+    const Char *str_;
+
+public:
+    template <typename FillChar>
+    StrFormatSpec(const Char *str, unsigned width, FillChar fill)
+        : AlignSpec(width, fill), str_(str)
+    {
+        internal::CharTraits<Char>::convert(FillChar());
+    }
+
+    const Char *str() const
+    {
+        return str_;
+    }
+};
+
+/**
+  Returns an integer format specifier to format the value in base 2.
+ */
+IntFormatSpec<int, TypeSpec<'b'> > bin(int value);
+
+/**
+  Returns an integer format specifier to format the value in base 8.
+ */
+IntFormatSpec<int, TypeSpec<'o'> > oct(int value);
+
+/**
+  Returns an integer format specifier to format the value in base 16 using
+  lower-case letters for the digits above 9.
+ */
+IntFormatSpec<int, TypeSpec<'x'> > hex(int value);
+
+/**
+  Returns an integer formatter format specifier to format in base 16 using
+  upper-case letters for the digits above 9.
+ */
+IntFormatSpec<int, TypeSpec<'X'> > hexu(int value);
+
+/**
+  \rst
+  Returns an integer format specifier to pad the formatted argument with the
+  fill character to the specified width using the default (right) numeric
+  alignment.
+
+  **Example**::
+
+    MemoryWriter out;
+    out << pad(hex(0xcafe), 8, '0');
+    // out.str() == "0000cafe"
+
+  \endrst
+ */
+template <char TYPE_CODE, typename Char>
+IntFormatSpec<int, AlignTypeSpec<TYPE_CODE>, Char> pad(
+    int value, unsigned width, Char fill = ' ');
+
+#define FMT_DEFINE_INT_FORMATTERS(TYPE) \
+inline IntFormatSpec<TYPE, TypeSpec<'b'> > bin(TYPE value) { \
+  return IntFormatSpec<TYPE, TypeSpec<'b'> >(value, TypeSpec<'b'>()); \
+} \
+ \
+inline IntFormatSpec<TYPE, TypeSpec<'o'> > oct(TYPE value) { \
+  return IntFormatSpec<TYPE, TypeSpec<'o'> >(value, TypeSpec<'o'>()); \
+} \
+ \
+inline IntFormatSpec<TYPE, TypeSpec<'x'> > hex(TYPE value) { \
+  return IntFormatSpec<TYPE, TypeSpec<'x'> >(value, TypeSpec<'x'>()); \
+} \
+ \
+inline IntFormatSpec<TYPE, TypeSpec<'X'> > hexu(TYPE value) { \
+  return IntFormatSpec<TYPE, TypeSpec<'X'> >(value, TypeSpec<'X'>()); \
+} \
+ \
+template <char TYPE_CODE> \
+inline IntFormatSpec<TYPE, AlignTypeSpec<TYPE_CODE> > pad( \
+    IntFormatSpec<TYPE, TypeSpec<TYPE_CODE> > f, unsigned width) { \
+  return IntFormatSpec<TYPE, AlignTypeSpec<TYPE_CODE> >( \
+      f.value(), AlignTypeSpec<TYPE_CODE>(width, ' ')); \
+} \
+ \
+/* For compatibility with older compilers we provide two overloads for pad, */ \
+/* one that takes a fill character and one that doesn't. In the future this */ \
+/* can be replaced with one overload making the template argument Char      */ \
+/* default to char (C++11). */ \
+template <char TYPE_CODE, typename Char> \
+inline IntFormatSpec<TYPE, AlignTypeSpec<TYPE_CODE>, Char> pad( \
+    IntFormatSpec<TYPE, TypeSpec<TYPE_CODE>, Char> f, \
+    unsigned width, Char fill) { \
+  return IntFormatSpec<TYPE, AlignTypeSpec<TYPE_CODE>, Char>( \
+      f.value(), AlignTypeSpec<TYPE_CODE>(width, fill)); \
+} \
+ \
+inline IntFormatSpec<TYPE, AlignTypeSpec<0> > pad( \
+    TYPE value, unsigned width) { \
+  return IntFormatSpec<TYPE, AlignTypeSpec<0> >( \
+      value, AlignTypeSpec<0>(width, ' ')); \
+} \
+ \
+template <typename Char> \
+inline IntFormatSpec<TYPE, AlignTypeSpec<0>, Char> pad( \
+   TYPE value, unsigned width, Char fill) { \
+ return IntFormatSpec<TYPE, AlignTypeSpec<0>, Char>( \
+     value, AlignTypeSpec<0>(width, fill)); \
+}
+
+FMT_DEFINE_INT_FORMATTERS(int)
+FMT_DEFINE_INT_FORMATTERS(long)
+FMT_DEFINE_INT_FORMATTERS(unsigned)
+FMT_DEFINE_INT_FORMATTERS(unsigned long)
+FMT_DEFINE_INT_FORMATTERS(LongLong)
+FMT_DEFINE_INT_FORMATTERS(ULongLong)
+
+/**
+  \rst
+  Returns a string formatter that pads the formatted argument with the fill
+  character to the specified width using the default (left) string alignment.
+
+  **Example**::
+
+    std::string s = str(MemoryWriter() << pad("abc", 8));
+    // s == "abc     "
+
+  \endrst
+ */
+template <typename Char>
+inline StrFormatSpec<Char> pad(
+    const Char *str, unsigned width, Char fill = ' ')
+{
+    return StrFormatSpec<Char>(str, width, fill);
+}
+
+inline StrFormatSpec<wchar_t> pad(
+    const wchar_t *str, unsigned width, char fill = ' ')
+{
+    return StrFormatSpec<wchar_t>(str, width, fill);
+}
+
+namespace internal
+{
+
+template <typename Char>
+class ArgMap
+{
+private:
+    typedef std::vector<
+    std::pair<fmt::BasicStringRef<Char>, internal::Arg> > MapType;
+    typedef typename MapType::value_type Pair;
+
+    MapType map_;
+
+public:
+    FMT_API void init(const ArgList &args);
+
+    const internal::Arg *find(const fmt::BasicStringRef<Char> &name) const
+    {
+        // The list is unsorted, so just return the first matching name.
+        for (typename MapType::const_iterator it = map_.begin(), end = map_.end();
+                it != end; ++it)
+        {
+            if (it->first == name)
+                return &it->second;
+        }
+        return FMT_NULL;
+    }
+};
+
+template <typename Impl, typename Char, typename Spec = fmt::FormatSpec>
+class ArgFormatterBase : public ArgVisitor<Impl, void>
+{
+private:
+    BasicWriter<Char> &writer_;
+    Spec &spec_;
+
+    FMT_DISALLOW_COPY_AND_ASSIGN(ArgFormatterBase);
+
+    void write_pointer(const void *p)
+    {
+        spec_.flags_ = HASH_FLAG;
+        spec_.type_ = 'x';
+        writer_.write_int(reinterpret_cast<uintptr_t>(p), spec_);
+    }
+
+    // workaround MSVC two-phase lookup issue
+    typedef internal::Arg Arg;
+
+protected:
+    BasicWriter<Char> &writer()
+    {
+        return writer_;
+    }
+    Spec &spec()
+    {
+        return spec_;
+    }
+
+    void write(bool value)
+    {
+        const char *str_value = value ? "true" : "false";
+        Arg::StringValue<char> str = { str_value, std::strlen(str_value) };
+        writer_.write_str(str, spec_);
+    }
+
+    void write(const char *value)
+    {
+        Arg::StringValue<char> str = {value, value ? std::strlen(value) : 0};
+        writer_.write_str(str, spec_);
+    }
+
+public:
+    typedef Spec SpecType;
+
+    ArgFormatterBase(BasicWriter<Char> &w, Spec &s)
+        : writer_(w), spec_(s) {}
+
+    template <typename T>
+    void visit_any_int(T value)
+    {
+        writer_.write_int(value, spec_);
+    }
+
+    template <typename T>
+    void visit_any_double(T value)
+    {
+        writer_.write_double(value, spec_);
+    }
+
+    void visit_bool(bool value)
+    {
+        if (spec_.type_)
+        {
+            visit_any_int(value);
+            return;
+        }
+        write(value);
+    }
+
+    void visit_char(int value)
+    {
+        if (spec_.type_ && spec_.type_ != 'c')
+        {
+            spec_.flags_ |= CHAR_FLAG;
+            writer_.write_int(value, spec_);
+            return;
+        }
+        if (spec_.align_ == ALIGN_NUMERIC || spec_.flags_ != 0)
+            FMT_THROW(FormatError("invalid format specifier for char"));
+        typedef typename BasicWriter<Char>::CharPtr CharPtr;
+        Char fill = internal::CharTraits<Char>::cast(spec_.fill());
+        CharPtr out = CharPtr();
+        const unsigned CHAR_SIZE = 1;
+        if (spec_.width_ > CHAR_SIZE)
+        {
+            out = writer_.grow_buffer(spec_.width_);
+            if (spec_.align_ == ALIGN_RIGHT)
+            {
+                std::uninitialized_fill_n(out, spec_.width_ - CHAR_SIZE, fill);
+                out += spec_.width_ - CHAR_SIZE;
+            }
+            else if (spec_.align_ == ALIGN_CENTER)
+            {
+                out = writer_.fill_padding(out, spec_.width_,
+                                           internal::const_check(CHAR_SIZE), fill);
+            }
+            else
+            {
+                std::uninitialized_fill_n(out + CHAR_SIZE,
+                                          spec_.width_ - CHAR_SIZE, fill);
+            }
+        }
+        else
+        {
+            out = writer_.grow_buffer(CHAR_SIZE);
+        }
+        *out = internal::CharTraits<Char>::cast(value);
+    }
+
+    void visit_cstring(const char *value)
+    {
+        if (spec_.type_ == 'p')
+            return write_pointer(value);
+        write(value);
+    }
+
+    // Qualification with "internal" here and below is a workaround for nvcc.
+    void visit_string(internal::Arg::StringValue<char> value)
+    {
+        writer_.write_str(value, spec_);
+    }
+
+    using ArgVisitor<Impl, void>::visit_wstring;
+
+    void visit_wstring(internal::Arg::StringValue<Char> value)
+    {
+        writer_.write_str(value, spec_);
+    }
+
+    void visit_pointer(const void *value)
+    {
+        if (spec_.type_ && spec_.type_ != 'p')
+            report_unknown_type(spec_.type_, "pointer");
+        write_pointer(value);
+    }
+};
+
+class FormatterBase
+{
+private:
+    ArgList args_;
+    int next_arg_index_;
+
+    // Returns the argument with specified index.
+    FMT_API Arg do_get_arg(unsigned arg_index, const char *&error);
+
+protected:
+    const ArgList &args() const
+    {
+        return args_;
+    }
+
+    explicit FormatterBase(const ArgList &args)
+    {
+        args_ = args;
+        next_arg_index_ = 0;
+    }
+
+    // Returns the next argument.
+    Arg next_arg(const char *&error)
+    {
+        if (next_arg_index_ >= 0)
+            return do_get_arg(internal::to_unsigned(next_arg_index_++), error);
+        error = "cannot switch from manual to automatic argument indexing";
+        return Arg();
+    }
+
+    // Checks if manual indexing is used and returns the argument with
+    // specified index.
+    Arg get_arg(unsigned arg_index, const char *&error)
+    {
+        return check_no_auto_index(error) ? do_get_arg(arg_index, error) : Arg();
+    }
+
+    bool check_no_auto_index(const char *&error)
+    {
+        if (next_arg_index_ > 0)
+        {
+            error = "cannot switch from automatic to manual argument indexing";
+            return false;
+        }
+        next_arg_index_ = -1;
+        return true;
+    }
+
+    template <typename Char>
+    void write(BasicWriter<Char> &w, const Char *start, const Char *end)
+    {
+        if (start != end)
+            w << BasicStringRef<Char>(start, internal::to_unsigned(end - start));
+    }
+};
+}  // namespace internal
+
+/**
+  \rst
+  An argument formatter based on the `curiously recurring template pattern
+  <http://en.wikipedia.org/wiki/Curiously_recurring_template_pattern>`_.
+
+  To use `~fmt::BasicArgFormatter` define a subclass that implements some or
+  all of the visit methods with the same signatures as the methods in
+  `~fmt::ArgVisitor`, for example, `~fmt::ArgVisitor::visit_int()`.
+  Pass the subclass as the *Impl* template parameter. When a formatting
+  function processes an argument, it will dispatch to a visit method
+  specific to the argument type. For example, if the argument type is
+  ``double`` then the `~fmt::ArgVisitor::visit_double()` method of a subclass
+  will be called. If the subclass doesn't contain a method with this signature,
+  then a corresponding method of `~fmt::BasicArgFormatter` or its superclass
+  will be called.
+  \endrst
+ */
+template <typename Impl, typename Char, typename Spec = fmt::FormatSpec>
+class BasicArgFormatter : public internal::ArgFormatterBase<Impl, Char, Spec>
+{
+private:
+    BasicFormatter<Char, Impl> &formatter_;
+    const Char *format_;
+
+public:
+    /**
+      \rst
+      Constructs an argument formatter object.
+      *formatter* is a reference to the main formatter object, *spec* contains
+      format specifier information for standard argument types, and *fmt* points
+      to the part of the format string being parsed for custom argument types.
+      \endrst
+     */
+    BasicArgFormatter(BasicFormatter<Char, Impl> &formatter,
+                      Spec &spec, const Char *fmt)
+        : internal::ArgFormatterBase<Impl, Char, Spec>(formatter.writer(), spec),
+          formatter_(formatter), format_(fmt) {}
+
+    /** Formats an argument of a custom (user-defined) type. */
+    void visit_custom(internal::Arg::CustomValue c)
+    {
+        c.format(&formatter_, c.value, &format_);
+    }
+};
+
+/** The default argument formatter. */
+template <typename Char>
+class ArgFormatter :
+    public BasicArgFormatter<ArgFormatter<Char>, Char, FormatSpec>
+{
+public:
+    /** Constructs an argument formatter object. */
+    ArgFormatter(BasicFormatter<Char> &formatter,
+                 FormatSpec &spec, const Char *fmt)
+        : BasicArgFormatter<ArgFormatter<Char>,
+          Char, FormatSpec>(formatter, spec, fmt) {}
+};
+
+/** This template formats data and writes the output to a writer. */
+template <typename CharType, typename ArgFormatter>
+class BasicFormatter : private internal::FormatterBase
+{
+public:
+    /** The character type for the output. */
+    typedef CharType Char;
+
+private:
+    BasicWriter<Char> &writer_;
+    internal::ArgMap<Char> map_;
+
+    FMT_DISALLOW_COPY_AND_ASSIGN(BasicFormatter);
+
+    using internal::FormatterBase::get_arg;
+
+    // Checks if manual indexing is used and returns the argument with
+    // specified name.
+    internal::Arg get_arg(BasicStringRef<Char> arg_name, const char *&error);
+
+    // Parses argument index and returns corresponding argument.
+    internal::Arg parse_arg_index(const Char *&s);
+
+    // Parses argument name and returns corresponding argument.
+    internal::Arg parse_arg_name(const Char *&s);
+
+public:
+    /**
+     \rst
+     Constructs a ``BasicFormatter`` object. References to the arguments and
+     the writer are stored in the formatter object so make sure they have
+     appropriate lifetimes.
+     \endrst
+     */
+    BasicFormatter(const ArgList &args, BasicWriter<Char> &w)
+        : internal::FormatterBase(args), writer_(w) {}
+
+    /** Returns a reference to the writer associated with this formatter. */
+    BasicWriter<Char> &writer()
+    {
+        return writer_;
+    }
+
+    /** Formats stored arguments and writes the output to the writer. */
+    void format(BasicCStringRef<Char> format_str);
+
+    // Formats a single argument and advances format_str, a format string pointer.
+    const Char *format(const Char *&format_str, const internal::Arg &arg);
+};
+
+// Generates a comma-separated list with results of applying f to
+// numbers 0..n-1.
+# define FMT_GEN(n, f) FMT_GEN##n(f)
+# define FMT_GEN1(f)  f(0)
+# define FMT_GEN2(f)  FMT_GEN1(f),  f(1)
+# define FMT_GEN3(f)  FMT_GEN2(f),  f(2)
+# define FMT_GEN4(f)  FMT_GEN3(f),  f(3)
+# define FMT_GEN5(f)  FMT_GEN4(f),  f(4)
+# define FMT_GEN6(f)  FMT_GEN5(f),  f(5)
+# define FMT_GEN7(f)  FMT_GEN6(f),  f(6)
+# define FMT_GEN8(f)  FMT_GEN7(f),  f(7)
+# define FMT_GEN9(f)  FMT_GEN8(f),  f(8)
+# define FMT_GEN10(f) FMT_GEN9(f),  f(9)
+# define FMT_GEN11(f) FMT_GEN10(f), f(10)
+# define FMT_GEN12(f) FMT_GEN11(f), f(11)
+# define FMT_GEN13(f) FMT_GEN12(f), f(12)
+# define FMT_GEN14(f) FMT_GEN13(f), f(13)
+# define FMT_GEN15(f) FMT_GEN14(f), f(14)
+
+namespace internal
+{
+inline uint64_t make_type()
+{
+    return 0;
+}
+
+template <typename T>
+inline uint64_t make_type(const T &arg)
+{
+    return MakeValue< BasicFormatter<char> >::type(arg);
+}
+
+template <std::size_t N, bool/*IsPacked*/= (N < ArgList::MAX_PACKED_ARGS)>
+          struct ArgArray;
+
+template <std::size_t N>
+struct ArgArray<N, true/*IsPacked*/>
+{
+    typedef Value Type[N > 0 ? N : 1];
+
+template <typename Formatter, typename T>
+static Value make(const T &value)
+{
+#ifdef __clang__
+    Value result = MakeValue<Formatter>(value);
+    // Workaround a bug in Apple LLVM version 4.2 (clang-425.0.28) of clang:
+    // https://github.com/fmtlib/fmt/issues/276
+    (void)result.custom.format;
+    return result;
+#else
+    return MakeValue<Formatter>(value);
+#endif
+}
+         };
+
+template <std::size_t N>
+struct ArgArray<N, false/*IsPacked*/>
+{
+    typedef Arg Type[N + 1]; // +1 for the list end Arg::NONE
+
+    template <typename Formatter, typename T>
+    static Arg make(const T &value)
+    {
+        return MakeArg<Formatter>(value);
+    }
+};
+
+#if FMT_USE_VARIADIC_TEMPLATES
+template <typename Arg, typename... Args>
+inline uint64_t make_type(const Arg &first, const Args & ... tail)
+{
+    return make_type(first) | (make_type(tail...) << 4);
+}
+
+#else
+
+struct ArgType
+{
+    uint64_t type;
+
+    ArgType() : type(0) {}
+
+    template <typename T>
+    ArgType(const T &arg) : type(make_type(arg)) {}
+};
+
+# define FMT_ARG_TYPE_DEFAULT(n) ArgType t##n = ArgType()
+
+inline uint64_t make_type(FMT_GEN15(FMT_ARG_TYPE_DEFAULT))
+{
+    return t0.type | (t1.type << 4) | (t2.type << 8) | (t3.type << 12) |
+           (t4.type << 16) | (t5.type << 20) | (t6.type << 24) | (t7.type << 28) |
+           (t8.type << 32) | (t9.type << 36) | (t10.type << 40) | (t11.type << 44) |
+           (t12.type << 48) | (t13.type << 52) | (t14.type << 56);
+}
+#endif
+}  // namespace internal
+
+# define FMT_MAKE_TEMPLATE_ARG(n) typename T##n
+# define FMT_MAKE_ARG_TYPE(n) T##n
+# define FMT_MAKE_ARG(n) const T##n &v##n
+# define FMT_ASSIGN_char(n) \
+  arr[n] = fmt::internal::MakeValue< fmt::BasicFormatter<char> >(v##n)
+# define FMT_ASSIGN_wchar_t(n) \
+  arr[n] = fmt::internal::MakeValue< fmt::BasicFormatter<wchar_t> >(v##n)
+
+#if FMT_USE_VARIADIC_TEMPLATES
+// Defines a variadic function returning void.
+# define FMT_VARIADIC_VOID(func, arg_type) \
+  template <typename... Args> \
+  void func(arg_type arg0, const Args & ... args) { \
+    typedef fmt::internal::ArgArray<sizeof...(Args)> ArgArray; \
+    typename ArgArray::Type array{ \
+      ArgArray::template make<fmt::BasicFormatter<Char> >(args)...}; \
+    func(arg0, fmt::ArgList(fmt::internal::make_type(args...), array)); \
+  }
+
+// Defines a variadic constructor.
+# define FMT_VARIADIC_CTOR(ctor, func, arg0_type, arg1_type) \
+  template <typename... Args> \
+  ctor(arg0_type arg0, arg1_type arg1, const Args & ... args) { \
+    typedef fmt::internal::ArgArray<sizeof...(Args)> ArgArray; \
+    typename ArgArray::Type array{ \
+      ArgArray::template make<fmt::BasicFormatter<Char> >(args)...}; \
+    func(arg0, arg1, fmt::ArgList(fmt::internal::make_type(args...), array)); \
+  }
+
+#else
+
+# define FMT_MAKE_REF(n) \
+  fmt::internal::MakeValue< fmt::BasicFormatter<Char> >(v##n)
+# define FMT_MAKE_REF2(n) v##n
+
+// Defines a wrapper for a function taking one argument of type arg_type
+// and n additional arguments of arbitrary types.
+# define FMT_WRAP1(func, arg_type, n) \
+  template <FMT_GEN(n, FMT_MAKE_TEMPLATE_ARG)> \
+  inline void func(arg_type arg1, FMT_GEN(n, FMT_MAKE_ARG)) { \
+    const fmt::internal::ArgArray<n>::Type array = {FMT_GEN(n, FMT_MAKE_REF)}; \
+    func(arg1, fmt::ArgList( \
+      fmt::internal::make_type(FMT_GEN(n, FMT_MAKE_REF2)), array)); \
+  }
+
+// Emulates a variadic function returning void on a pre-C++11 compiler.
+# define FMT_VARIADIC_VOID(func, arg_type) \
+  inline void func(arg_type arg) { func(arg, fmt::ArgList()); } \
+  FMT_WRAP1(func, arg_type, 1) FMT_WRAP1(func, arg_type, 2) \
+  FMT_WRAP1(func, arg_type, 3) FMT_WRAP1(func, arg_type, 4) \
+  FMT_WRAP1(func, arg_type, 5) FMT_WRAP1(func, arg_type, 6) \
+  FMT_WRAP1(func, arg_type, 7) FMT_WRAP1(func, arg_type, 8) \
+  FMT_WRAP1(func, arg_type, 9) FMT_WRAP1(func, arg_type, 10)
+
+# define FMT_CTOR(ctor, func, arg0_type, arg1_type, n) \
+  template <FMT_GEN(n, FMT_MAKE_TEMPLATE_ARG)> \
+  ctor(arg0_type arg0, arg1_type arg1, FMT_GEN(n, FMT_MAKE_ARG)) { \
+    const fmt::internal::ArgArray<n>::Type array = {FMT_GEN(n, FMT_MAKE_REF)}; \
+    func(arg0, arg1, fmt::ArgList( \
+      fmt::internal::make_type(FMT_GEN(n, FMT_MAKE_REF2)), array)); \
+  }
+
+// Emulates a variadic constructor on a pre-C++11 compiler.
+# define FMT_VARIADIC_CTOR(ctor, func, arg0_type, arg1_type) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 1) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 2) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 3) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 4) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 5) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 6) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 7) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 8) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 9) \
+  FMT_CTOR(ctor, func, arg0_type, arg1_type, 10)
+#endif
+
+// Generates a comma-separated list with results of applying f to pairs
+// (argument, index).
+#define FMT_FOR_EACH1(f, x0) f(x0, 0)
+#define FMT_FOR_EACH2(f, x0, x1) \
+  FMT_FOR_EACH1(f, x0), f(x1, 1)
+#define FMT_FOR_EACH3(f, x0, x1, x2) \
+  FMT_FOR_EACH2(f, x0 ,x1), f(x2, 2)
+#define FMT_FOR_EACH4(f, x0, x1, x2, x3) \
+  FMT_FOR_EACH3(f, x0, x1, x2), f(x3, 3)
+#define FMT_FOR_EACH5(f, x0, x1, x2, x3, x4) \
+  FMT_FOR_EACH4(f, x0, x1, x2, x3), f(x4, 4)
+#define FMT_FOR_EACH6(f, x0, x1, x2, x3, x4, x5) \
+  FMT_FOR_EACH5(f, x0, x1, x2, x3, x4), f(x5, 5)
+#define FMT_FOR_EACH7(f, x0, x1, x2, x3, x4, x5, x6) \
+  FMT_FOR_EACH6(f, x0, x1, x2, x3, x4, x5), f(x6, 6)
+#define FMT_FOR_EACH8(f, x0, x1, x2, x3, x4, x5, x6, x7) \
+  FMT_FOR_EACH7(f, x0, x1, x2, x3, x4, x5, x6), f(x7, 7)
+#define FMT_FOR_EACH9(f, x0, x1, x2, x3, x4, x5, x6, x7, x8) \
+  FMT_FOR_EACH8(f, x0, x1, x2, x3, x4, x5, x6, x7), f(x8, 8)
+#define FMT_FOR_EACH10(f, x0, x1, x2, x3, x4, x5, x6, x7, x8, x9) \
+  FMT_FOR_EACH9(f, x0, x1, x2, x3, x4, x5, x6, x7, x8), f(x9, 9)
+
+/**
+ An error returned by an operating system or a language runtime,
+ for example a file opening error.
+*/
+class SystemError : public internal::RuntimeError
+{
+private:
+    FMT_API void init(int err_code, CStringRef format_str, ArgList args);
+
+protected:
+    int error_code_;
+
+    typedef char Char;  // For FMT_VARIADIC_CTOR.
+
+    SystemError() {}
+
+public:
+    /**
+     \rst
+     Constructs a :class:`fmt::SystemError` object with a description
+     formatted with `fmt::format_system_error`. *message* and additional
+     arguments passed into the constructor are formatted similarly to
+     `fmt::format`.
+
+     **Example**::
+
+       // This throws a SystemError with the description
+       //   cannot open file 'madeup': No such file or directory
+       // or similar (system message may vary).
+       const char *filename = "madeup";
+       std::FILE *file = std::fopen(filename, "r");
+       if (!file)
+         throw fmt::SystemError(errno, "cannot open file '{}'", filename);
+     \endrst
+    */
+    SystemError(int error_code, CStringRef message)
+    {
+        init(error_code, message, ArgList());
+    }
+    FMT_DEFAULTED_COPY_CTOR(SystemError)
+    FMT_VARIADIC_CTOR(SystemError, init, int, CStringRef)
+
+    FMT_API ~SystemError() FMT_DTOR_NOEXCEPT;
+
+    int error_code() const
+    {
+        return error_code_;
+    }
+};
+
+/**
+  \rst
+  Formats an error returned by an operating system or a language runtime,
+  for example a file opening error, and writes it to *out* in the following
+  form:
+
+  .. parsed-literal::
+     *<message>*: *<system-message>*
+
+  where *<message>* is the passed message and *<system-message>* is
+  the system message corresponding to the error code.
+  *error_code* is a system error code as given by ``errno``.
+  If *error_code* is not a valid error code such as -1, the system message
+  may look like "Unknown error -1" and is platform-dependent.
+  \endrst
+ */
+FMT_API void format_system_error(fmt::Writer &out, int error_code,
+                                 fmt::StringRef message) FMT_NOEXCEPT;
+
+/**
+  \rst
+  This template provides operations for formatting and writing data into
+  a character stream. The output is stored in a buffer provided by a subclass
+  such as :class:`fmt::BasicMemoryWriter`.
+
+  You can use one of the following typedefs for common character types:
+
+  +---------+----------------------+
+  | Type    | Definition           |
+  +=========+======================+
+  | Writer  | BasicWriter<char>    |
+  +---------+----------------------+
+  | WWriter | BasicWriter<wchar_t> |
+  +---------+----------------------+
+
+  \endrst
+ */
+template <typename Char>
+class BasicWriter
+{
+private:
+    // Output buffer.
+    Buffer<Char> &buffer_;
+
+    FMT_DISALLOW_COPY_AND_ASSIGN(BasicWriter);
+
+    typedef typename internal::CharTraits<Char>::CharPtr CharPtr;
+
+#if FMT_SECURE_SCL
+    // Returns pointer value.
+    static Char *get(CharPtr p)
+    {
+        return p.base();
+    }
+#else
+    static Char *get(Char *p)
+    {
+        return p;
+    }
+#endif
+
+    // Fills the padding around the content and returns the pointer to the
+    // content area.
+    static CharPtr fill_padding(CharPtr buffer,
+                                unsigned total_size, std::size_t content_size, wchar_t fill);
+
+    // Grows the buffer by n characters and returns a pointer to the newly
+    // allocated area.
+    CharPtr grow_buffer(std::size_t n)
+    {
+        std::size_t size = buffer_.size();
+        buffer_.resize(size + n);
+        return internal::make_ptr(&buffer_[size], n);
+    }
+
+    // Writes an unsigned decimal integer.
+    template <typename UInt>
+    Char *write_unsigned_decimal(UInt value, unsigned prefix_size = 0)
+    {
+        unsigned num_digits = internal::count_digits(value);
+        Char *ptr = get(grow_buffer(prefix_size + num_digits));
+        internal::format_decimal(ptr + prefix_size, value, num_digits);
+        return ptr;
+    }
+
+    // Writes a decimal integer.
+    template <typename Int>
+    void write_decimal(Int value)
+    {
+        typedef typename internal::IntTraits<Int>::MainType MainType;
+        MainType abs_value = static_cast<MainType>(value);
+        if (internal::is_negative(value))
+        {
+            abs_value = 0 - abs_value;
+            *write_unsigned_decimal(abs_value, 1) = '-';
+        }
+        else
+        {
+            write_unsigned_decimal(abs_value, 0);
+        }
+    }
+
+    // Prepare a buffer for integer formatting.
+    CharPtr prepare_int_buffer(unsigned num_digits,
+                               const EmptySpec &, const char *prefix, unsigned prefix_size)
+    {
+        unsigned size = prefix_size + num_digits;
+        CharPtr p = grow_buffer(size);
+        std::uninitialized_copy(prefix, prefix + prefix_size, p);
+        return p + size - 1;
+    }
+
+    template <typename Spec>
+    CharPtr prepare_int_buffer(unsigned num_digits,
+                               const Spec &spec, const char *prefix, unsigned prefix_size);
+
+    // Formats an integer.
+    template <typename T, typename Spec>
+    void write_int(T value, Spec spec);
+
+    // Formats a floating-point number (double or long double).
+    template <typename T, typename Spec>
+    void write_double(T value, const Spec &spec);
+
+    // Writes a formatted string.
+    template <typename StrChar>
+    CharPtr write_str(const StrChar *s, std::size_t size, const AlignSpec &spec);
+
+    template <typename StrChar, typename Spec>
+    void write_str(const internal::Arg::StringValue<StrChar> &str,
+                   const Spec &spec);
+
+    // This following methods are private to disallow writing wide characters
+    // and strings to a char stream. If you want to print a wide string as a
+    // pointer as std::ostream does, cast it to const void*.
+    // Do not implement!
+    void operator<<(typename internal::WCharHelper<wchar_t, Char>::Unsupported);
+    void operator<<(
+        typename internal::WCharHelper<const wchar_t *, Char>::Unsupported);
+
+    // Appends floating-point length specifier to the format string.
+    // The second argument is only used for overload resolution.
+    void append_float_length(Char *&format_ptr, long double)
+    {
+        *format_ptr++ = 'L';
+    }
+
+    template<typename T>
+    void append_float_length(Char *&, T) {}
+
+    template <typename Impl, typename Char_, typename Spec_>
+    friend class internal::ArgFormatterBase;
+
+    template <typename Impl, typename Char_, typename Spec_>
+    friend class BasicPrintfArgFormatter;
+
+protected:
+    /**
+      Constructs a ``BasicWriter`` object.
+     */
+    explicit BasicWriter(Buffer<Char> &b) : buffer_(b) {}
+
+public:
+    /**
+      \rst
+      Destroys a ``BasicWriter`` object.
+      \endrst
+     */
+    virtual ~BasicWriter() {}
+
+    /**
+      Returns the total number of characters written.
+     */
+    std::size_t size() const
+    {
+        return buffer_.size();
+    }
+
+    /**
+      Returns a pointer to the output buffer content. No terminating null
+      character is appended.
+     */
+    const Char *data() const FMT_NOEXCEPT
+    {
+        return &buffer_[0];
+    }
+
+    /**
+      Returns a pointer to the output buffer content with terminating null
+      character appended.
+     */
+    const Char *c_str() const
+    {
+        std::size_t size = buffer_.size();
+        buffer_.reserve(size + 1);
+        buffer_[size] = '\0';
+        return &buffer_[0];
+    }
+
+    /**
+      \rst
+      Returns the content of the output buffer as an `std::string`.
+      \endrst
+     */
+    std::basic_string<Char> str() const
+    {
+        return std::basic_string<Char>(&buffer_[0], buffer_.size());
+    }
+
+    /**
+      \rst
+      Writes formatted data.
+
+      *args* is an argument list representing arbitrary arguments.
+
+      **Example**::
+
+         MemoryWriter out;
+         out.write("Current point:\n");
+         out.write("({:+f}, {:+f})", -3.14, 3.14);
+
+      This will write the following output to the ``out`` object:
+
+      .. code-block:: none
+
+         Current point:
+         (-3.140000, +3.140000)
+
+      The output can be accessed using :func:`data()`, :func:`c_str` or
+      :func:`str` methods.
+
+      See also :ref:`syntax`.
+      \endrst
+     */
+    void write(BasicCStringRef<Char> format, ArgList args)
+    {
+        BasicFormatter<Char>(args, *this).format(format);
+    }
+    FMT_VARIADIC_VOID(write, BasicCStringRef<Char>)
+
+    BasicWriter &operator<<(int value)
+    {
+        write_decimal(value);
+        return *this;
+    }
+    BasicWriter &operator<<(unsigned value)
+    {
+        return *this << IntFormatSpec<unsigned>(value);
+    }
+    BasicWriter &operator<<(long value)
+    {
+        write_decimal(value);
+        return *this;
+    }
+    BasicWriter &operator<<(unsigned long value)
+    {
+        return *this << IntFormatSpec<unsigned long>(value);
+    }
+    BasicWriter &operator<<(LongLong value)
+    {
+        write_decimal(value);
+        return *this;
+    }
+
+    /**
+      \rst
+      Formats *value* and writes it to the stream.
+      \endrst
+     */
+    BasicWriter &operator<<(ULongLong value)
+    {
+        return *this << IntFormatSpec<ULongLong>(value);
+    }
+
+    BasicWriter &operator<<(double value)
+    {
+        write_double(value, FormatSpec());
+        return *this;
+    }
+
+    /**
+      \rst
+      Formats *value* using the general format for floating-point numbers
+      (``'g'``) and writes it to the stream.
+      \endrst
+     */
+    BasicWriter &operator<<(long double value)
+    {
+        write_double(value, FormatSpec());
+        return *this;
+    }
+
+    /**
+      Writes a character to the stream.
+     */
+    BasicWriter &operator<<(char value)
+    {
+        buffer_.push_back(value);
+        return *this;
+    }
+
+    BasicWriter &operator<<(
+        typename internal::WCharHelper<wchar_t, Char>::Supported value)
+    {
+        buffer_.push_back(value);
+        return *this;
+    }
+
+    /**
+      \rst
+      Writes *value* to the stream.
+      \endrst
+     */
+    BasicWriter &operator<<(fmt::BasicStringRef<Char> value)
+    {
+        const Char *str = value.data();
+        buffer_.append(str, str + value.size());
+        return *this;
+    }
+
+    BasicWriter &operator<<(
+        typename internal::WCharHelper<StringRef, Char>::Supported value)
+    {
+        const char *str = value.data();
+        buffer_.append(str, str + value.size());
+        return *this;
+    }
+
+    template <typename T, typename Spec, typename FillChar>
+    BasicWriter &operator<<(IntFormatSpec<T, Spec, FillChar> spec)
+    {
+        internal::CharTraits<Char>::convert(FillChar());
+        write_int(spec.value(), spec);
+        return *this;
+    }
+
+    template <typename StrChar>
+    BasicWriter &operator<<(const StrFormatSpec<StrChar> &spec)
+    {
+        const StrChar *s = spec.str();
+        write_str(s, std::char_traits<Char>::length(s), spec);
+        return *this;
+    }
+
+    void clear() FMT_NOEXCEPT { buffer_.clear(); }
+
+    Buffer<Char> &buffer() FMT_NOEXCEPT { return buffer_; }
+};
+
+template <typename Char>
+template <typename StrChar>
+typename BasicWriter<Char>::CharPtr BasicWriter<Char>::write_str(
+    const StrChar *s, std::size_t size, const AlignSpec &spec)
+{
+    CharPtr out = CharPtr();
+    if (spec.width() > size)
+    {
+        out = grow_buffer(spec.width());
+        Char fill = internal::CharTraits<Char>::cast(spec.fill());
+        if (spec.align() == ALIGN_RIGHT)
+        {
+            std::uninitialized_fill_n(out, spec.width() - size, fill);
+            out += spec.width() - size;
+        }
+        else if (spec.align() == ALIGN_CENTER)
+        {
+            out = fill_padding(out, spec.width(), size, fill);
+        }
+        else
+        {
+            std::uninitialized_fill_n(out + size, spec.width() - size, fill);
+        }
+    }
+    else
+    {
+        out = grow_buffer(size);
+    }
+    std::uninitialized_copy(s, s + size, out);
+    return out;
+}
+
+template <typename Char>
+template <typename StrChar, typename Spec>
+void BasicWriter<Char>::write_str(
+    const internal::Arg::StringValue<StrChar> &s, const Spec &spec)
+{
+    // Check if StrChar is convertible to Char.
+    internal::CharTraits<Char>::convert(StrChar());
+    if (spec.type_ && spec.type_ != 's')
+        internal::report_unknown_type(spec.type_, "string");
+    const StrChar *str_value = s.value;
+    std::size_t str_size = s.size;
+    if (str_size == 0)
+    {
+        if (!str_value)
+        {
+            FMT_THROW(FormatError("string pointer is null"));
+        }
+    }
+    std::size_t precision = static_cast<std::size_t>(spec.precision_);
+    if (spec.precision_ >= 0 && precision < str_size)
+        str_size = precision;
+    write_str(str_value, str_size, spec);
+}
+
+template <typename Char>
+typename BasicWriter<Char>::CharPtr
+BasicWriter<Char>::fill_padding(
+    CharPtr buffer, unsigned total_size,
+    std::size_t content_size, wchar_t fill)
+{
+    std::size_t padding = total_size - content_size;
+    std::size_t left_padding = padding / 2;
+    Char fill_char = internal::CharTraits<Char>::cast(fill);
+    std::uninitialized_fill_n(buffer, left_padding, fill_char);
+    buffer += left_padding;
+    CharPtr content = buffer;
+    std::uninitialized_fill_n(buffer + content_size,
+                              padding - left_padding, fill_char);
+    return content;
+}
+
+template <typename Char>
+template <typename Spec>
+typename BasicWriter<Char>::CharPtr
+BasicWriter<Char>::prepare_int_buffer(
+    unsigned num_digits, const Spec &spec,
+    const char *prefix, unsigned prefix_size)
+{
+    unsigned width = spec.width();
+    Alignment align = spec.align();
+    Char fill = internal::CharTraits<Char>::cast(spec.fill());
+    if (spec.precision() > static_cast<int>(num_digits))
+    {
+        // Octal prefix '0' is counted as a digit, so ignore it if precision
+        // is specified.
+        if (prefix_size > 0 && prefix[prefix_size - 1] == '0')
+            --prefix_size;
+        unsigned number_size =
+            prefix_size + internal::to_unsigned(spec.precision());
+        AlignSpec subspec(number_size, '0', ALIGN_NUMERIC);
+        if (number_size >= width)
+            return prepare_int_buffer(num_digits, subspec, prefix, prefix_size);
+        buffer_.reserve(width);
+        unsigned fill_size = width - number_size;
+        if (align != ALIGN_LEFT)
+        {
+            CharPtr p = grow_buffer(fill_size);
+            std::uninitialized_fill(p, p + fill_size, fill);
+        }
+        CharPtr result = prepare_int_buffer(
+                             num_digits, subspec, prefix, prefix_size);
+        if (align == ALIGN_LEFT)
+        {
+            CharPtr p = grow_buffer(fill_size);
+            std::uninitialized_fill(p, p + fill_size, fill);
+        }
+        return result;
+    }
+    unsigned size = prefix_size + num_digits;
+    if (width <= size)
+    {
+        CharPtr p = grow_buffer(size);
+        std::uninitialized_copy(prefix, prefix + prefix_size, p);
+        return p + size - 1;
+    }
+    CharPtr p = grow_buffer(width);
+    CharPtr end = p + width;
+    if (align == ALIGN_LEFT)
+    {
+        std::uninitialized_copy(prefix, prefix + prefix_size, p);
+        p += size;
+        std::uninitialized_fill(p, end, fill);
+    }
+    else if (align == ALIGN_CENTER)
+    {
+        p = fill_padding(p, width, size, fill);
+        std::uninitialized_copy(prefix, prefix + prefix_size, p);
+        p += size;
+    }
+    else
+    {
+        if (align == ALIGN_NUMERIC)
+        {
+            if (prefix_size != 0)
+            {
+                p = std::uninitialized_copy(prefix, prefix + prefix_size, p);
+                size -= prefix_size;
+            }
+        }
+        else
+        {
+            std::uninitialized_copy(prefix, prefix + prefix_size, end - size);
+        }
+        std::uninitialized_fill(p, end - size, fill);
+        p = end;
+    }
+    return p - 1;
+}
+
+template <typename Char>
+template <typename T, typename Spec>
+void BasicWriter<Char>::write_int(T value, Spec spec)
+{
+    unsigned prefix_size = 0;
+    typedef typename internal::IntTraits<T>::MainType UnsignedType;
+    UnsignedType abs_value = static_cast<UnsignedType>(value);
+    char prefix[4] = "";
+    if (internal::is_negative(value))
+    {
+        prefix[0] = '-';
+        ++prefix_size;
+        abs_value = 0 - abs_value;
+    }
+    else if (spec.flag(SIGN_FLAG))
+    {
+        prefix[0] = spec.flag(PLUS_FLAG) ? '+' : ' ';
+        ++prefix_size;
+    }
+    switch (spec.type())
+    {
+    case 0:
+    case 'd':
+    {
+        unsigned num_digits = internal::count_digits(abs_value);
+        CharPtr p = prepare_int_buffer(num_digits, spec, prefix, prefix_size) + 1;
+        internal::format_decimal(get(p), abs_value, 0);
+        break;
+    }
+    case 'x':
+    case 'X':
+    {
+        UnsignedType n = abs_value;
+        if (spec.flag(HASH_FLAG))
+        {
+            prefix[prefix_size++] = '0';
+            prefix[prefix_size++] = spec.type_prefix();
+        }
+        unsigned num_digits = 0;
+        do
+        {
+            ++num_digits;
+        }
+        while ((n >>= 4) != 0);
+        Char *p = get(prepare_int_buffer(
+                          num_digits, spec, prefix, prefix_size));
+        n = abs_value;
+        const char *digits = spec.type() == 'x' ?
+                             "0123456789abcdef" : "0123456789ABCDEF";
+        do
+        {
+            *p-- = digits[n & 0xf];
+        }
+        while ((n >>= 4) != 0);
+        break;
+    }
+    case 'b':
+    case 'B':
+    {
+        UnsignedType n = abs_value;
+        if (spec.flag(HASH_FLAG))
+        {
+            prefix[prefix_size++] = '0';
+            prefix[prefix_size++] = spec.type_prefix();
+        }
+        unsigned num_digits = 0;
+        do
+        {
+            ++num_digits;
+        }
+        while ((n >>= 1) != 0);
+        Char *p = get(prepare_int_buffer(num_digits, spec, prefix, prefix_size));
+        n = abs_value;
+        do
+        {
+            *p-- = static_cast<Char>('0' + (n & 1));
+        }
+        while ((n >>= 1) != 0);
+        break;
+    }
+    case 'o':
+    {
+        UnsignedType n = abs_value;
+        if (spec.flag(HASH_FLAG))
+            prefix[prefix_size++] = '0';
+        unsigned num_digits = 0;
+        do
+        {
+            ++num_digits;
+        }
+        while ((n >>= 3) != 0);
+        Char *p = get(prepare_int_buffer(num_digits, spec, prefix, prefix_size));
+        n = abs_value;
+        do
+        {
+            *p-- = static_cast<Char>('0' + (n & 7));
+        }
+        while ((n >>= 3) != 0);
+        break;
+    }
+    case 'n':
+    {
+        unsigned num_digits = internal::count_digits(abs_value);
+        fmt::StringRef sep = "";
+#if !(defined(ANDROID) || defined(__ANDROID__))
+        sep = internal::thousands_sep(std::localeconv());
+#endif
+        unsigned size = static_cast<unsigned>(
+                            num_digits + sep.size() * ((num_digits - 1) / 3));
+        CharPtr p = prepare_int_buffer(size, spec, prefix, prefix_size) + 1;
+        internal::format_decimal(get(p), abs_value, 0, internal::ThousandsSep(sep));
+        break;
+    }
+    default:
+        internal::report_unknown_type(
+            spec.type(), spec.flag(CHAR_FLAG) ? "char" : "integer");
+        break;
+    }
+}
+
+template <typename Char>
+template <typename T, typename Spec>
+void BasicWriter<Char>::write_double(T value, const Spec &spec)
+{
+    // Check type.
+    char type = spec.type();
+    bool upper = false;
+    switch (type)
+    {
+    case 0:
+        type = 'g';
+        break;
+    case 'e':
+    case 'f':
+    case 'g':
+    case 'a':
+        break;
+    case 'F':
+#if FMT_MSC_VER
+        // MSVC's printf doesn't support 'F'.
+        type = 'f';
+#endif
+    // Fall through.
+    case 'E':
+    case 'G':
+    case 'A':
+        upper = true;
+        break;
+    default:
+        internal::report_unknown_type(type, "double");
+        break;
+    }
+
+    char sign = 0;
+    // Use isnegative instead of value < 0 because the latter is always
+    // false for NaN.
+    if (internal::FPUtil::isnegative(static_cast<double>(value)))
+    {
+        sign = '-';
+        value = -value;
+    }
+    else if (spec.flag(SIGN_FLAG))
+    {
+        sign = spec.flag(PLUS_FLAG) ? '+' : ' ';
+    }
+
+    if (internal::FPUtil::isnotanumber(value))
+    {
+        // Format NaN ourselves because sprintf's output is not consistent
+        // across platforms.
+        std::size_t nan_size = 4;
+        const char *nan = upper ? " NAN" : " nan";
+        if (!sign)
+        {
+            --nan_size;
+            ++nan;
+        }
+        CharPtr out = write_str(nan, nan_size, spec);
+        if (sign)
+            *out = sign;
+        return;
+    }
+
+    if (internal::FPUtil::isinfinity(value))
+    {
+        // Format infinity ourselves because sprintf's output is not consistent
+        // across platforms.
+        std::size_t inf_size = 4;
+        const char *inf = upper ? " INF" : " inf";
+        if (!sign)
+        {
+            --inf_size;
+            ++inf;
+        }
+        CharPtr out = write_str(inf, inf_size, spec);
+        if (sign)
+            *out = sign;
+        return;
+    }
+
+    std::size_t offset = buffer_.size();
+    unsigned width = spec.width();
+    if (sign)
+    {
+        buffer_.reserve(buffer_.size() + (width > 1u ? width : 1u));
+        if (width > 0)
+            --width;
+        ++offset;
+    }
+
+    // Build format string.
+    enum { MAX_FORMAT_SIZE = 10}; // longest format: %#-*.*Lg
+    Char format[MAX_FORMAT_SIZE];
+    Char *format_ptr = format;
+    *format_ptr++ = '%';
+    unsigned width_for_sprintf = width;
+    if (spec.flag(HASH_FLAG))
+        *format_ptr++ = '#';
+    if (spec.align() == ALIGN_CENTER)
+    {
+        width_for_sprintf = 0;
+    }
+    else
+    {
+        if (spec.align() == ALIGN_LEFT)
+            *format_ptr++ = '-';
+        if (width != 0)
+            *format_ptr++ = '*';
+    }
+    if (spec.precision() >= 0)
+    {
+        *format_ptr++ = '.';
+        *format_ptr++ = '*';
+    }
+
+    append_float_length(format_ptr, value);
+    *format_ptr++ = type;
+    *format_ptr = '\0';
+
+    // Format using snprintf.
+    Char fill = internal::CharTraits<Char>::cast(spec.fill());
+    unsigned n = 0;
+    Char *start = FMT_NULL;
+    for (;;)
+    {
+        std::size_t buffer_size = buffer_.capacity() - offset;
+#if FMT_MSC_VER
+        // MSVC's vsnprintf_s doesn't work with zero size, so reserve
+        // space for at least one extra character to make the size non-zero.
+        // Note that the buffer's capacity will increase by more than 1.
+        if (buffer_size == 0)
+        {
+            buffer_.reserve(offset + 1);
+            buffer_size = buffer_.capacity() - offset;
+        }
+#endif
+        start = &buffer_[offset];
+        int result = internal::CharTraits<Char>::format_float(
+                         start, buffer_size, format, width_for_sprintf, spec.precision(), value);
+        if (result >= 0)
+        {
+            n = internal::to_unsigned(result);
+            if (offset + n < buffer_.capacity())
+                break;  // The buffer is large enough - continue with formatting.
+            buffer_.reserve(offset + n + 1);
+        }
+        else
+        {
+            // If result is negative we ask to increase the capacity by at least 1,
+            // but as std::vector, the buffer grows exponentially.
+            buffer_.reserve(buffer_.capacity() + 1);
+        }
+    }
+    if (sign)
+    {
+        if ((spec.align() != ALIGN_RIGHT && spec.align() != ALIGN_DEFAULT) ||
+                *start != ' ')
+        {
+            *(start - 1) = sign;
+            sign = 0;
+        }
+        else
+        {
+            *(start - 1) = fill;
+        }
+        ++n;
+    }
+    if (spec.align() == ALIGN_CENTER && spec.width() > n)
+    {
+        width = spec.width();
+        CharPtr p = grow_buffer(width);
+        std::memmove(get(p) + (width - n) / 2, get(p), n * sizeof(Char));
+        fill_padding(p, spec.width(), n, fill);
+        return;
+    }
+    if (spec.fill() != ' ' || sign)
+    {
+        while (*start == ' ')
+            *start++ = fill;
+        if (sign)
+            *(start - 1) = sign;
+    }
+    grow_buffer(n);
+}
+
+/**
+  \rst
+  This class template provides operations for formatting and writing data
+  into a character stream. The output is stored in a memory buffer that grows
+  dynamically.
+
+  You can use one of the following typedefs for common character types
+  and the standard allocator:
+
+  +---------------+-----------------------------------------------------+
+  | Type          | Definition                                          |
+  +===============+=====================================================+
+  | MemoryWriter  | BasicMemoryWriter<char, std::allocator<char>>       |
+  +---------------+-----------------------------------------------------+
+  | WMemoryWriter | BasicMemoryWriter<wchar_t, std::allocator<wchar_t>> |
+  +---------------+-----------------------------------------------------+
+
+  **Example**::
+
+     MemoryWriter out;
+     out << "The answer is " << 42 << "\n";
+     out.write("({:+f}, {:+f})", -3.14, 3.14);
+
+  This will write the following output to the ``out`` object:
+
+  .. code-block:: none
+
+     The answer is 42
+     (-3.140000, +3.140000)
+
+  The output can be converted to an ``std::string`` with ``out.str()`` or
+  accessed as a C string with ``out.c_str()``.
+  \endrst
+ */
+template <typename Char, typename Allocator = std::allocator<Char> >
+class BasicMemoryWriter : public BasicWriter<Char>
+{
+private:
+    internal::MemoryBuffer<Char, internal::INLINE_BUFFER_SIZE, Allocator> buffer_;
+
+public:
+    explicit BasicMemoryWriter(const Allocator& alloc = Allocator())
+        : BasicWriter<Char>(buffer_), buffer_(alloc) {}
+
+#if FMT_USE_RVALUE_REFERENCES
+    /**
+      \rst
+      Constructs a :class:`fmt::BasicMemoryWriter` object moving the content
+      of the other object to it.
+      \endrst
+     */
+    BasicMemoryWriter(BasicMemoryWriter &&other)
+        : BasicWriter<Char>(buffer_), buffer_(std::move(other.buffer_))
+    {
+    }
+
+    /**
+      \rst
+      Moves the content of the other ``BasicMemoryWriter`` object to this one.
+      \endrst
+     */
+    BasicMemoryWriter &operator=(BasicMemoryWriter &&other)
+    {
+        buffer_ = std::move(other.buffer_);
+        return *this;
+    }
+#endif
+};
+
+typedef BasicMemoryWriter<char> MemoryWriter;
+typedef BasicMemoryWriter<wchar_t> WMemoryWriter;
+
+/**
+  \rst
+  This class template provides operations for formatting and writing data
+  into a fixed-size array. For writing into a dynamically growing buffer
+  use :class:`fmt::BasicMemoryWriter`.
+
+  Any write method will throw ``std::runtime_error`` if the output doesn't fit
+  into the array.
+
+  You can use one of the following typedefs for common character types:
+
+  +--------------+---------------------------+
+  | Type         | Definition                |
+  +==============+===========================+
+  | ArrayWriter  | BasicArrayWriter<char>    |
+  +--------------+---------------------------+
+  | WArrayWriter | BasicArrayWriter<wchar_t> |
+  +--------------+---------------------------+
+  \endrst
+ */
+template <typename Char>
+class BasicArrayWriter : public BasicWriter<Char>
+{
+private:
+    internal::FixedBuffer<Char> buffer_;
+
+public:
+    /**
+     \rst
+     Constructs a :class:`fmt::BasicArrayWriter` object for *array* of the
+     given size.
+     \endrst
+     */
+    BasicArrayWriter(Char *array, std::size_t size)
+        : BasicWriter<Char>(buffer_), buffer_(array, size) {}
+
+    /**
+     \rst
+     Constructs a :class:`fmt::BasicArrayWriter` object for *array* of the
+     size known at compile time.
+     \endrst
+     */
+    template <std::size_t SIZE>
+    explicit BasicArrayWriter(Char (&array)[SIZE])
+        : BasicWriter<Char>(buffer_), buffer_(array, SIZE) {}
+};
+
+typedef BasicArrayWriter<char> ArrayWriter;
+typedef BasicArrayWriter<wchar_t> WArrayWriter;
+
+// Reports a system error without throwing an exception.
+// Can be used to report errors from destructors.
+FMT_API void report_system_error(int error_code,
+                                 StringRef message) FMT_NOEXCEPT;
+
+#if FMT_USE_WINDOWS_H
+
+/** A Windows error. */
+class WindowsError : public SystemError
+{
+private:
+    FMT_API void init(int error_code, CStringRef format_str, ArgList args);
+
+public:
+    /**
+     \rst
+     Constructs a :class:`fmt::WindowsError` object with the description
+     of the form
+
+     .. parsed-literal::
+       *<message>*: *<system-message>*
+
+     where *<message>* is the formatted message and *<system-message>* is the
+     system message corresponding to the error code.
+     *error_code* is a Windows error code as given by ``GetLastError``.
+     If *error_code* is not a valid error code such as -1, the system message
+     will look like "error -1".
+
+     **Example**::
+
+       // This throws a WindowsError with the description
+       //   cannot open file 'madeup': The system cannot find the file specified.
+       // or similar (system message may vary).
+       const char *filename = "madeup";
+       LPOFSTRUCT of = LPOFSTRUCT();
+       HFILE file = OpenFile(filename, &of, OF_READ);
+       if (file == HFILE_ERROR) {
+         throw fmt::WindowsError(GetLastError(),
+                                 "cannot open file '{}'", filename);
+       }
+     \endrst
+    */
+    WindowsError(int error_code, CStringRef message)
+    {
+        init(error_code, message, ArgList());
+    }
+    FMT_VARIADIC_CTOR(WindowsError, init, int, CStringRef)
+};
+
+// Reports a Windows error without throwing an exception.
+// Can be used to report errors from destructors.
+FMT_API void report_windows_error(int error_code,
+                                  StringRef message) FMT_NOEXCEPT;
+
+#endif
+
+enum Color { BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE };
+
+/**
+  Formats a string and prints it to stdout using ANSI escape sequences
+  to specify color (experimental).
+  Example:
+    print_colored(fmt::RED, "Elapsed time: {0:.2f} seconds", 1.23);
+ */
+FMT_API void print_colored(Color c, CStringRef format, ArgList args);
+
+/**
+  \rst
+  Formats arguments and returns the result as a string.
+
+  **Example**::
+
+    std::string message = format("The answer is {}", 42);
+  \endrst
+*/
+inline std::string format(CStringRef format_str, ArgList args)
+{
+    MemoryWriter w;
+    w.write(format_str, args);
+    return w.str();
+}
+
+inline std::wstring format(WCStringRef format_str, ArgList args)
+{
+    WMemoryWriter w;
+    w.write(format_str, args);
+    return w.str();
+}
+
+/**
+  \rst
+  Prints formatted data to the file *f*.
+
+  **Example**::
+
+    print(stderr, "Don't {}!", "panic");
+  \endrst
+ */
+FMT_API void print(std::FILE *f, CStringRef format_str, ArgList args);
+
+/**
+  \rst
+  Prints formatted data to ``stdout``.
+
+  **Example**::
+
+    print("Elapsed time: {0:.2f} seconds", 1.23);
+  \endrst
+ */
+FMT_API void print(CStringRef format_str, ArgList args);
+
+/**
+  Fast integer formatter.
+ */
+class FormatInt
+{
+private:
+    // Buffer should be large enough to hold all digits (digits10 + 1),
+    // a sign and a null character.
+    enum {BUFFER_SIZE = std::numeric_limits<ULongLong>::digits10 + 3};
+    mutable char buffer_[BUFFER_SIZE];
+    char *str_;
+
+    // Formats value in reverse and returns the number of digits.
+    char *format_decimal(ULongLong value)
+    {
+        char *buffer_end = buffer_ + BUFFER_SIZE - 1;
+        while (value >= 100)
+        {
+            // Integer division is slow so do it for a group of two digits instead
+            // of for every digit. The idea comes from the talk by Alexandrescu
+            // "Three Optimization Tips for C++". See speed-test for a comparison.
+            unsigned index = static_cast<unsigned>((value % 100) * 2);
+            value /= 100;
+            *--buffer_end = internal::Data::DIGITS[index + 1];
+            *--buffer_end = internal::Data::DIGITS[index];
+        }
+        if (value < 10)
+        {
+            *--buffer_end = static_cast<char>('0' + value);
+            return buffer_end;
+        }
+        unsigned index = static_cast<unsigned>(value * 2);
+        *--buffer_end = internal::Data::DIGITS[index + 1];
+        *--buffer_end = internal::Data::DIGITS[index];
+        return buffer_end;
+    }
+
+    void FormatSigned(LongLong value)
+    {
+        ULongLong abs_value = static_cast<ULongLong>(value);
+        bool negative = value < 0;
+        if (negative)
+            abs_value = 0 - abs_value;
+        str_ = format_decimal(abs_value);
+        if (negative)
+            *--str_ = '-';
+    }
+
+public:
+    explicit FormatInt(int value)
+    {
+        FormatSigned(value);
+    }
+    explicit FormatInt(long value)
+    {
+        FormatSigned(value);
+    }
+    explicit FormatInt(LongLong value)
+    {
+        FormatSigned(value);
+    }
+    explicit FormatInt(unsigned value) : str_(format_decimal(value)) {}
+    explicit FormatInt(unsigned long value) : str_(format_decimal(value)) {}
+    explicit FormatInt(ULongLong value) : str_(format_decimal(value)) {}
+
+    /** Returns the number of characters written to the output buffer. */
+    std::size_t size() const
+    {
+        return internal::to_unsigned(buffer_ - str_ + BUFFER_SIZE - 1);
+    }
+
+    /**
+      Returns a pointer to the output buffer content. No terminating null
+      character is appended.
+     */
+    const char *data() const
+    {
+        return str_;
+    }
+
+    /**
+      Returns a pointer to the output buffer content with terminating null
+      character appended.
+     */
+    const char *c_str() const
+    {
+        buffer_[BUFFER_SIZE - 1] = '\0';
+        return str_;
+    }
+
+    /**
+      \rst
+      Returns the content of the output buffer as an ``std::string``.
+      \endrst
+     */
+    std::string str() const
+    {
+        return std::string(str_, size());
+    }
+};
+
+// Formats a decimal integer value writing into buffer and returns
+// a pointer to the end of the formatted string. This function doesn't
+// write a terminating null character.
+template <typename T>
+inline void format_decimal(char *&buffer, T value)
+{
+    typedef typename internal::IntTraits<T>::MainType MainType;
+    MainType abs_value = static_cast<MainType>(value);
+    if (internal::is_negative(value))
+    {
+        *buffer++ = '-';
+        abs_value = 0 - abs_value;
+    }
+    if (abs_value < 100)
+    {
+        if (abs_value < 10)
+        {
+            *buffer++ = static_cast<char>('0' + abs_value);
+            return;
+        }
+        unsigned index = static_cast<unsigned>(abs_value * 2);
+        *buffer++ = internal::Data::DIGITS[index];
+        *buffer++ = internal::Data::DIGITS[index + 1];
+        return;
+    }
+    unsigned num_digits = internal::count_digits(abs_value);
+    internal::format_decimal(buffer, abs_value, num_digits);
+    buffer += num_digits;
+}
+
+/**
+  \rst
+  Returns a named argument for formatting functions.
+
+  **Example**::
+
+    print("Elapsed time: {s:.2f} seconds", arg("s", 1.23));
+
+  \endrst
+ */
+template <typename T>
+inline internal::NamedArgWithType<char, T> arg(StringRef name, const T &arg)
+{
+    return internal::NamedArgWithType<char, T>(name, arg);
+}
+
+template <typename T>
+inline internal::NamedArgWithType<wchar_t, T> arg(WStringRef name, const T &arg)
+{
+    return internal::NamedArgWithType<wchar_t, T>(name, arg);
+}
+
+// The following two functions are deleted intentionally to disable
+// nested named arguments as in ``format("{}", arg("a", arg("b", 42)))``.
+template <typename Char>
+void arg(StringRef, const internal::NamedArg<Char>&) FMT_DELETED_OR_UNDEFINED;
+template <typename Char>
+void arg(WStringRef, const internal::NamedArg<Char>&) FMT_DELETED_OR_UNDEFINED;
+}
+
+#if FMT_GCC_VERSION
+// Use the system_header pragma to suppress warnings about variadic macros
+// because suppressing -Wvariadic-macros with the diagnostic pragma doesn't
+// work. It is used at the end because we want to suppress as little warnings
+// as possible.
+# pragma GCC system_header
+#endif
+
+// This is used to work around VC++ bugs in handling variadic macros.
+#define FMT_EXPAND(args) args
+
+// Returns the number of arguments.
+// Based on https://groups.google.com/forum/#!topic/comp.std.c/d-6Mj5Lko_s.
+#define FMT_NARG(...) FMT_NARG_(__VA_ARGS__, FMT_RSEQ_N())
+#define FMT_NARG_(...) FMT_EXPAND(FMT_ARG_N(__VA_ARGS__))
+#define FMT_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, N, ...) N
+#define FMT_RSEQ_N() 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
+
+#define FMT_FOR_EACH_(N, f, ...) \
+  FMT_EXPAND(FMT_CONCAT(FMT_FOR_EACH, N)(f, __VA_ARGS__))
+#define FMT_FOR_EACH(f, ...) \
+  FMT_EXPAND(FMT_FOR_EACH_(FMT_NARG(__VA_ARGS__), f, __VA_ARGS__))
+
+#define FMT_ADD_ARG_NAME(type, index) type arg##index
+#define FMT_GET_ARG_NAME(type, index) arg##index
+
+#if FMT_USE_VARIADIC_TEMPLATES
+# define FMT_VARIADIC_(Char, ReturnType, func, call, ...) \
+  template <typename... Args> \
+  ReturnType func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
+      const Args & ... args) { \
+    typedef fmt::internal::ArgArray<sizeof...(Args)> ArgArray; \
+    typename ArgArray::Type array{ \
+      ArgArray::template make<fmt::BasicFormatter<Char> >(args)...}; \
+    call(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
+      fmt::ArgList(fmt::internal::make_type(args...), array)); \
+  }
+#else
+// Defines a wrapper for a function taking __VA_ARGS__ arguments
+// and n additional arguments of arbitrary types.
+# define FMT_WRAP(Char, ReturnType, func, call, n, ...) \
+  template <FMT_GEN(n, FMT_MAKE_TEMPLATE_ARG)> \
+  inline ReturnType func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
+      FMT_GEN(n, FMT_MAKE_ARG)) { \
+    fmt::internal::ArgArray<n>::Type arr; \
+    FMT_GEN(n, FMT_ASSIGN_##Char); \
+    call(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), fmt::ArgList( \
+      fmt::internal::make_type(FMT_GEN(n, FMT_MAKE_REF2)), arr)); \
+  }
+
+# define FMT_VARIADIC_(Char, ReturnType, func, call, ...) \
+  inline ReturnType func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__)) { \
+    call(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), fmt::ArgList()); \
+  } \
+  FMT_WRAP(Char, ReturnType, func, call, 1, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 2, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 3, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 4, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 5, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 6, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 7, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 8, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 9, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 10, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 11, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 12, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 13, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 14, __VA_ARGS__) \
+  FMT_WRAP(Char, ReturnType, func, call, 15, __VA_ARGS__)
+#endif  // FMT_USE_VARIADIC_TEMPLATES
+
+/**
+  \rst
+  Defines a variadic function with the specified return type, function name
+  and argument types passed as variable arguments to this macro.
+
+  **Example**::
+
+    void print_error(const char *file, int line, const char *format,
+                     fmt::ArgList args) {
+      fmt::print("{}: {}: ", file, line);
+      fmt::print(format, args);
+    }
+    FMT_VARIADIC(void, print_error, const char *, int, const char *)
+
+  ``FMT_VARIADIC`` is used for compatibility with legacy C++ compilers that
+  don't implement variadic templates. You don't have to use this macro if
+  you don't need legacy compiler support and can use variadic templates
+  directly::
+
+    template <typename... Args>
+    void print_error(const char *file, int line, const char *format,
+                     const Args & ... args) {
+      fmt::print("{}: {}: ", file, line);
+      fmt::print(format, args...);
+    }
+  \endrst
+ */
+#define FMT_VARIADIC(ReturnType, func, ...) \
+  FMT_VARIADIC_(char, ReturnType, func, return func, __VA_ARGS__)
+
+#define FMT_VARIADIC_W(ReturnType, func, ...) \
+  FMT_VARIADIC_(wchar_t, ReturnType, func, return func, __VA_ARGS__)
+
+#define FMT_CAPTURE_ARG_(id, index) ::fmt::arg(#id, id)
+
+#define FMT_CAPTURE_ARG_W_(id, index) ::fmt::arg(L###id, id)
+
+/**
+  \rst
+  Convenient macro to capture the arguments' names and values into several
+  ``fmt::arg(name, value)``.
+
+  **Example**::
+
+    int x = 1, y = 2;
+    print("point: ({x}, {y})", FMT_CAPTURE(x, y));
+    // same as:
+    // print("point: ({x}, {y})", arg("x", x), arg("y", y));
+
+  \endrst
+ */
+#define FMT_CAPTURE(...) FMT_FOR_EACH(FMT_CAPTURE_ARG_, __VA_ARGS__)
+
+#define FMT_CAPTURE_W(...) FMT_FOR_EACH(FMT_CAPTURE_ARG_W_, __VA_ARGS__)
+
+namespace fmt
+{
+FMT_VARIADIC(std::string, format, CStringRef)
+FMT_VARIADIC_W(std::wstring, format, WCStringRef)
+FMT_VARIADIC(void, print, CStringRef)
+FMT_VARIADIC(void, print, std::FILE *, CStringRef)
+FMT_VARIADIC(void, print_colored, Color, CStringRef)
+
+namespace internal
+{
+template <typename Char>
+inline bool is_name_start(Char c)
+{
+    return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || '_' == c;
+}
+
+// Parses an unsigned integer advancing s to the end of the parsed input.
+// This function assumes that the first character of s is a digit.
+template <typename Char>
+unsigned parse_nonnegative_int(const Char *&s)
+{
+    assert('0' <= *s && *s <= '9');
+    unsigned value = 0;
+    do
+    {
+        unsigned new_value = value * 10 + (*s++ - '0');
+        // Check if value wrapped around.
+        if (new_value < value)
+        {
+            value = (std::numeric_limits<unsigned>::max)();
+            break;
+        }
+        value = new_value;
+    }
+    while ('0' <= *s && *s <= '9');
+    // Convert to unsigned to prevent a warning.
+    unsigned max_int = (std::numeric_limits<int>::max)();
+    if (value > max_int)
+        FMT_THROW(FormatError("number is too big"));
+    return value;
+}
+
+inline void require_numeric_argument(const Arg &arg, char spec)
+{
+    if (arg.type > Arg::LAST_NUMERIC_TYPE)
+    {
+        std::string message =
+            fmt::format("format specifier '{}' requires numeric argument", spec);
+        FMT_THROW(fmt::FormatError(message));
+    }
+}
+
+template <typename Char>
+void check_sign(const Char *&s, const Arg &arg)
+{
+    char sign = static_cast<char>(*s);
+    require_numeric_argument(arg, sign);
+    if (arg.type == Arg::UINT || arg.type == Arg::ULONG_LONG)
+    {
+        FMT_THROW(FormatError(fmt::format(
+                                  "format specifier '{}' requires signed argument", sign)));
+    }
+    ++s;
+}
+}  // namespace internal
+
+template <typename Char, typename AF>
+inline internal::Arg BasicFormatter<Char, AF>::get_arg(
+    BasicStringRef<Char> arg_name, const char *&error)
+{
+    if (check_no_auto_index(error))
+    {
+        map_.init(args());
+        const internal::Arg *arg = map_.find(arg_name);
+        if (arg)
+            return *arg;
+        error = "argument not found";
+    }
+    return internal::Arg();
+}
+
+template <typename Char, typename AF>
+inline internal::Arg BasicFormatter<Char, AF>::parse_arg_index(const Char *&s)
+{
+    const char *error = FMT_NULL;
+    internal::Arg arg = *s < '0' || *s > '9' ?
+                        next_arg(error) : get_arg(internal::parse_nonnegative_int(s), error);
+    if (error)
+    {
+        FMT_THROW(FormatError(
+                      *s != '}' && *s != ':' ? "invalid format string" : error));
+    }
+    return arg;
+}
+
+template <typename Char, typename AF>
+inline internal::Arg BasicFormatter<Char, AF>::parse_arg_name(const Char *&s)
+{
+    assert(internal::is_name_start(*s));
+    const Char *start = s;
+    Char c;
+    do
+    {
+        c = *++s;
+    }
+    while (internal::is_name_start(c) || ('0' <= c && c <= '9'));
+    const char *error = FMT_NULL;
+    internal::Arg arg = get_arg(BasicStringRef<Char>(start, s - start), error);
+    if (error)
+        FMT_THROW(FormatError(error));
+    return arg;
+}
+
+template <typename Char, typename ArgFormatter>
+const Char *BasicFormatter<Char, ArgFormatter>::format(
+    const Char *&format_str, const internal::Arg &arg)
+{
+    using internal::Arg;
+    const Char *s = format_str;
+    typename ArgFormatter::SpecType spec;
+    if (*s == ':')
+    {
+        if (arg.type == Arg::CUSTOM)
+        {
+            arg.custom.format(this, arg.custom.value, &s);
+            return s;
+        }
+        ++s;
+        // Parse fill and alignment.
+        if (Char c = *s)
+        {
+            const Char *p = s + 1;
+            spec.align_ = ALIGN_DEFAULT;
+            do
+            {
+                switch (*p)
+                {
+                case '<':
+                    spec.align_ = ALIGN_LEFT;
+                    break;
+                case '>':
+                    spec.align_ = ALIGN_RIGHT;
+                    break;
+                case '=':
+                    spec.align_ = ALIGN_NUMERIC;
+                    break;
+                case '^':
+                    spec.align_ = ALIGN_CENTER;
+                    break;
+                }
+                if (spec.align_ != ALIGN_DEFAULT)
+                {
+                    if (p != s)
+                    {
+                        if (c == '}') break;
+                        if (c == '{')
+                            FMT_THROW(FormatError("invalid fill character '{'"));
+                        s += 2;
+                        spec.fill_ = c;
+                    }
+                    else ++s;
+                    if (spec.align_ == ALIGN_NUMERIC)
+                        require_numeric_argument(arg, '=');
+                    break;
+                }
+            }
+            while (--p >= s);
+        }
+
+        // Parse sign.
+        switch (*s)
+        {
+        case '+':
+            check_sign(s, arg);
+            spec.flags_ |= SIGN_FLAG | PLUS_FLAG;
+            break;
+        case '-':
+            check_sign(s, arg);
+            spec.flags_ |= MINUS_FLAG;
+            break;
+        case ' ':
+            check_sign(s, arg);
+            spec.flags_ |= SIGN_FLAG;
+            break;
+        }
+
+        if (*s == '#')
+        {
+            require_numeric_argument(arg, '#');
+            spec.flags_ |= HASH_FLAG;
+            ++s;
+        }
+
+        // Parse zero flag.
+        if (*s == '0')
+        {
+            require_numeric_argument(arg, '0');
+            spec.align_ = ALIGN_NUMERIC;
+            spec.fill_ = '0';
+            ++s;
+        }
+
+        // Parse width.
+        if ('0' <= *s && *s <= '9')
+        {
+            spec.width_ = internal::parse_nonnegative_int(s);
+        }
+        else if (*s == '{')
+        {
+            ++s;
+            Arg width_arg = internal::is_name_start(*s) ?
+                            parse_arg_name(s) : parse_arg_index(s);
+            if (*s++ != '}')
+                FMT_THROW(FormatError("invalid format string"));
+            ULongLong value = 0;
+            switch (width_arg.type)
+            {
+            case Arg::INT:
+                if (width_arg.int_value < 0)
+                    FMT_THROW(FormatError("negative width"));
+                value = width_arg.int_value;
+                break;
+            case Arg::UINT:
+                value = width_arg.uint_value;
+                break;
+            case Arg::LONG_LONG:
+                if (width_arg.long_long_value < 0)
+                    FMT_THROW(FormatError("negative width"));
+                value = width_arg.long_long_value;
+                break;
+            case Arg::ULONG_LONG:
+                value = width_arg.ulong_long_value;
+                break;
+            default:
+                FMT_THROW(FormatError("width is not integer"));
+            }
+            if (value > (std::numeric_limits<int>::max)())
+                FMT_THROW(FormatError("number is too big"));
+            spec.width_ = static_cast<int>(value);
+        }
+
+        // Parse precision.
+        if (*s == '.')
+        {
+            ++s;
+            spec.precision_ = 0;
+            if ('0' <= *s && *s <= '9')
+            {
+                spec.precision_ = internal::parse_nonnegative_int(s);
+            }
+            else if (*s == '{')
+            {
+                ++s;
+                Arg precision_arg = internal::is_name_start(*s) ?
+                                    parse_arg_name(s) : parse_arg_index(s);
+                if (*s++ != '}')
+                    FMT_THROW(FormatError("invalid format string"));
+                ULongLong value = 0;
+                switch (precision_arg.type)
+                {
+                case Arg::INT:
+                    if (precision_arg.int_value < 0)
+                        FMT_THROW(FormatError("negative precision"));
+                    value = precision_arg.int_value;
+                    break;
+                case Arg::UINT:
+                    value = precision_arg.uint_value;
+                    break;
+                case Arg::LONG_LONG:
+                    if (precision_arg.long_long_value < 0)
+                        FMT_THROW(FormatError("negative precision"));
+                    value = precision_arg.long_long_value;
+                    break;
+                case Arg::ULONG_LONG:
+                    value = precision_arg.ulong_long_value;
+                    break;
+                default:
+                    FMT_THROW(FormatError("precision is not integer"));
+                }
+                if (value > (std::numeric_limits<int>::max)())
+                    FMT_THROW(FormatError("number is too big"));
+                spec.precision_ = static_cast<int>(value);
+            }
+            else
+            {
+                FMT_THROW(FormatError("missing precision specifier"));
+            }
+            if (arg.type <= Arg::LAST_INTEGER_TYPE || arg.type == Arg::POINTER)
+            {
+                FMT_THROW(FormatError(
+                              fmt::format("precision not allowed in {} format specifier",
+                                          arg.type == Arg::POINTER ? "pointer" : "integer")));
+            }
+        }
+
+        // Parse type.
+        if (*s != '}' && *s)
+            spec.type_ = static_cast<char>(*s++);
+    }
+
+    if (*s++ != '}')
+        FMT_THROW(FormatError("missing '}' in format string"));
+
+    // Format argument.
+    ArgFormatter(*this, spec, s - 1).visit(arg);
+    return s;
+}
+
+template <typename Char, typename AF>
+void BasicFormatter<Char, AF>::format(BasicCStringRef<Char> format_str)
+{
+    const Char *s = format_str.c_str();
+    const Char *start = s;
+    while (*s)
+    {
+        Char c = *s++;
+        if (c != '{' && c != '}') continue;
+        if (*s == c)
+        {
+            write(writer_, start, s);
+            start = ++s;
+            continue;
+        }
+        if (c == '}')
+            FMT_THROW(FormatError("unmatched '}' in format string"));
+        write(writer_, start, s - 1);
+        internal::Arg arg = internal::is_name_start(*s) ?
+                            parse_arg_name(s) : parse_arg_index(s);
+        start = s = format(s, arg);
+    }
+    write(writer_, start, s);
+}
+
+template <typename Char, typename It>
+struct ArgJoin
+{
+    It first;
+    It last;
+    BasicCStringRef<Char> sep;
+
+    ArgJoin(It first, It last, const BasicCStringRef<Char>& sep) :
+        first(first),
+        last(last),
+        sep(sep) {}
+};
+
+template <typename It>
+ArgJoin<char, It> join(It first, It last, const BasicCStringRef<char>& sep)
+{
+    return ArgJoin<char, It>(first, last, sep);
+}
+
+template <typename It>
+ArgJoin<wchar_t, It> join(It first, It last, const BasicCStringRef<wchar_t>& sep)
+{
+    return ArgJoin<wchar_t, It>(first, last, sep);
+}
+
+#if FMT_HAS_GXX_CXX11
+template <typename Range>
+auto join(const Range& range, const BasicCStringRef<char>& sep)
+-> ArgJoin<char, decltype(std::begin(range))>
+{
+    return join(std::begin(range), std::end(range), sep);
+}
+
+template <typename Range>
+auto join(const Range& range, const BasicCStringRef<wchar_t>& sep)
+-> ArgJoin<wchar_t, decltype(std::begin(range))>
+{
+    return join(std::begin(range), std::end(range), sep);
+}
+#endif
+
+template <typename ArgFormatter, typename Char, typename It>
+void format_arg(fmt::BasicFormatter<Char, ArgFormatter> &f,
+                const Char *&format_str, const ArgJoin<Char, It>& e)
+{
+    const Char* end = format_str;
+    if (*end == ':')
+        ++end;
+    while (*end && *end != '}')
+        ++end;
+    if (*end != '}')
+        FMT_THROW(FormatError("missing '}' in format string"));
+
+    It it = e.first;
+    if (it != e.last)
+    {
+        const Char* save = format_str;
+        f.format(format_str, internal::MakeArg<fmt::BasicFormatter<Char, ArgFormatter> >(*it++));
+        while (it != e.last)
+        {
+            f.writer().write(e.sep);
+            format_str = save;
+            f.format(format_str, internal::MakeArg<fmt::BasicFormatter<Char, ArgFormatter> >(*it++));
+        }
+    }
+    format_str = end + 1;
+}
+}  // namespace fmt
+
+#if FMT_USE_USER_DEFINED_LITERALS
+namespace fmt
+{
+namespace internal
+{
+
+template <typename Char>
+struct UdlFormat
+{
+    const Char *str;
+
+    template <typename... Args>
+    auto operator()(Args && ... args) const
+    -> decltype(format(str, std::forward<Args>(args)...))
+    {
+        return format(str, std::forward<Args>(args)...);
+    }
+};
+
+template <typename Char>
+struct UdlArg
+{
+    const Char *str;
+
+    template <typename T>
+    NamedArgWithType<Char, T> operator=(T &&value) const
+    {
+        return {str, std::forward<T>(value)};
+    }
+};
+
+} // namespace internal
+
+inline namespace literals
+{
+
+/**
+  \rst
+  C++11 literal equivalent of :func:`fmt::format`.
+
+  **Example**::
+
+    using namespace fmt::literals;
+    std::string message = "The answer is {}"_format(42);
+  \endrst
+ */
+inline internal::UdlFormat<char>
+operator"" _format(const char *s, std::size_t)
+{
+    return {s};
+}
+inline internal::UdlFormat<wchar_t>
+operator"" _format(const wchar_t *s, std::size_t)
+{
+    return {s};
+}
+
+/**
+  \rst
+  C++11 literal equivalent of :func:`fmt::arg`.
+
+  **Example**::
+
+    using namespace fmt::literals;
+    print("Elapsed time: {s:.2f} seconds", "s"_a=1.23);
+  \endrst
+ */
+inline internal::UdlArg<char>
+operator"" _a(const char *s, std::size_t)
+{
+    return {s};
+}
+inline internal::UdlArg<wchar_t>
+operator"" _a(const wchar_t *s, std::size_t)
+{
+    return {s};
+}
+
+} // inline namespace literals
+} // namespace fmt
+#endif // FMT_USE_USER_DEFINED_LITERALS
+
+// Restore warnings.
+#if FMT_GCC_VERSION >= 406
+# pragma GCC diagnostic pop
+#endif
+
+#if defined(__clang__) && !defined(FMT_ICC_VERSION)
+# pragma clang diagnostic pop
+#endif
+
+#ifdef FMT_HEADER_ONLY
+# define FMT_FUNC inline
+# include "format.cc"
+#else
+# define FMT_FUNC
+#endif
+
+#endif  // FMT_FORMAT_H_
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/ostream.cc b/3d_party/spd_log/include/spdlog/fmt/bundled/ostream.cc
new file mode 100644
index 000000000..2d443f730
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/ostream.cc
@@ -0,0 +1,35 @@
+/*
+ Formatting library for C++ - std::ostream support
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#include "ostream.h"
+
+namespace fmt {
+
+namespace internal {
+FMT_FUNC void write(std::ostream &os, Writer &w) {
+  const char *data = w.data();
+  typedef internal::MakeUnsigned<std::streamsize>::Type UnsignedStreamSize;
+  UnsignedStreamSize size = w.size();
+  UnsignedStreamSize max_size =
+      internal::to_unsigned((std::numeric_limits<std::streamsize>::max)());
+  do {
+    UnsignedStreamSize n = size <= max_size ? size : max_size;
+    os.write(data, static_cast<std::streamsize>(n));
+    data += n;
+    size -= n;
+  } while (size != 0);
+}
+}
+
+FMT_FUNC void print(std::ostream &os, CStringRef format_str, ArgList args) {
+  MemoryWriter w;
+  w.write(format_str, args);
+  internal::write(os, w);
+}
+}  // namespace fmt
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/ostream.h b/3d_party/spd_log/include/spdlog/fmt/bundled/ostream.h
new file mode 100644
index 000000000..cfb8e0355
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/ostream.h
@@ -0,0 +1,114 @@
+/*
+ Formatting library for C++ - std::ostream support
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#ifndef FMT_OSTREAM_H_
+#define FMT_OSTREAM_H_
+
+#include "format.h"
+#include <ostream>
+
+namespace fmt
+{
+
+namespace internal
+{
+
+template <class Char>
+class FormatBuf : public std::basic_streambuf<Char>
+{
+private:
+    typedef typename std::basic_streambuf<Char>::int_type int_type;
+    typedef typename std::basic_streambuf<Char>::traits_type traits_type;
+
+    Buffer<Char> &buffer_;
+
+public:
+    FormatBuf(Buffer<Char> &buffer) : buffer_(buffer) {}
+
+protected:
+    // The put-area is actually always empty. This makes the implementation
+    // simpler and has the advantage that the streambuf and the buffer are always
+    // in sync and sputc never writes into uninitialized memory. The obvious
+    // disadvantage is that each call to sputc always results in a (virtual) call
+    // to overflow. There is no disadvantage here for sputn since this always
+    // results in a call to xsputn.
+
+    int_type overflow(int_type ch = traits_type::eof()) FMT_OVERRIDE
+    {
+        if (!traits_type::eq_int_type(ch, traits_type::eof()))
+            buffer_.push_back(static_cast<Char>(ch));
+        return ch;
+    }
+
+    std::streamsize xsputn(const Char *s, std::streamsize count) FMT_OVERRIDE
+    {
+        buffer_.append(s, s + count);
+        return count;
+    }
+};
+
+Yes &convert(std::ostream &);
+
+struct DummyStream : std::ostream
+{
+    DummyStream();  // Suppress a bogus warning in MSVC.
+    // Hide all operator<< overloads from std::ostream.
+    void operator<<(Null<>);
+};
+
+No &operator<<(std::ostream &, int);
+
+template<typename T>
+struct ConvertToIntImpl<T, true>
+{
+    // Convert to int only if T doesn't have an overloaded operator<<.
+    enum
+    {
+        value = sizeof(convert(get<DummyStream>() << get<T>())) == sizeof(No)
+    };
+};
+
+// Write the content of w to os.
+FMT_API void write(std::ostream &os, Writer &w);
+}  // namespace internal
+
+// Formats a value.
+template <typename Char, typename ArgFormatter_, typename T>
+void format_arg(BasicFormatter<Char, ArgFormatter_> &f,
+                const Char *&format_str, const T &value)
+{
+    internal::MemoryBuffer<Char, internal::INLINE_BUFFER_SIZE> buffer;
+
+    internal::FormatBuf<Char> format_buf(buffer);
+    std::basic_ostream<Char> output(&format_buf);
+    output << value;
+
+    BasicStringRef<Char> str(&buffer[0], buffer.size());
+    typedef internal::MakeArg< BasicFormatter<Char> > MakeArg;
+    format_str = f.format(format_str, MakeArg(str));
+}
+
+/**
+  \rst
+  Prints formatted data to the stream *os*.
+
+  **Example**::
+
+    print(cerr, "Don't {}!", "panic");
+  \endrst
+ */
+FMT_API void print(std::ostream &os, CStringRef format_str, ArgList args);
+FMT_VARIADIC(void, print, std::ostream &, CStringRef)
+}  // namespace fmt
+
+#ifdef FMT_HEADER_ONLY
+# include "ostream.cc"
+#endif
+
+#endif  // FMT_OSTREAM_H_
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/posix.cc b/3d_party/spd_log/include/spdlog/fmt/bundled/posix.cc
new file mode 100644
index 000000000..356668c13
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/posix.cc
@@ -0,0 +1,241 @@
+/*
+ A C++ interface to POSIX functions.
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+// Disable bogus MSVC warnings.
+#ifndef _CRT_SECURE_NO_WARNINGS
+# define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include "posix.h"
+
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#ifndef _WIN32
+# include <unistd.h>
+#else
+# ifndef WIN32_LEAN_AND_MEAN
+#  define WIN32_LEAN_AND_MEAN
+# endif
+# include <windows.h>
+# include <io.h>
+
+# define O_CREAT _O_CREAT
+# define O_TRUNC _O_TRUNC
+
+# ifndef S_IRUSR
+#  define S_IRUSR _S_IREAD
+# endif
+
+# ifndef S_IWUSR
+#  define S_IWUSR _S_IWRITE
+# endif
+
+# ifdef __MINGW32__
+#  define _SH_DENYNO 0x40
+# endif
+
+#endif  // _WIN32
+
+#ifdef fileno
+# undef fileno
+#endif
+
+namespace {
+#ifdef _WIN32
+// Return type of read and write functions.
+typedef int RWResult;
+
+// On Windows the count argument to read and write is unsigned, so convert
+// it from size_t preventing integer overflow.
+inline unsigned convert_rwcount(std::size_t count) {
+  return count <= UINT_MAX ? static_cast<unsigned>(count) : UINT_MAX;
+}
+#else
+// Return type of read and write functions.
+typedef ssize_t RWResult;
+
+inline std::size_t convert_rwcount(std::size_t count) { return count; }
+#endif
+}
+
+fmt::BufferedFile::~BufferedFile() FMT_NOEXCEPT {
+  if (file_ && FMT_SYSTEM(fclose(file_)) != 0)
+    fmt::report_system_error(errno, "cannot close file");
+}
+
+fmt::BufferedFile::BufferedFile(
+    fmt::CStringRef filename, fmt::CStringRef mode) {
+  FMT_RETRY_VAL(file_, FMT_SYSTEM(fopen(filename.c_str(), mode.c_str())), 0);
+  if (!file_)
+    FMT_THROW(SystemError(errno, "cannot open file {}", filename));
+}
+
+void fmt::BufferedFile::close() {
+  if (!file_)
+    return;
+  int result = FMT_SYSTEM(fclose(file_));
+  file_ = FMT_NULL;
+  if (result != 0)
+    FMT_THROW(SystemError(errno, "cannot close file"));
+}
+
+// A macro used to prevent expansion of fileno on broken versions of MinGW.
+#define FMT_ARGS
+
+int fmt::BufferedFile::fileno() const {
+  int fd = FMT_POSIX_CALL(fileno FMT_ARGS(file_));
+  if (fd == -1)
+    FMT_THROW(SystemError(errno, "cannot get file descriptor"));
+  return fd;
+}
+
+fmt::File::File(fmt::CStringRef path, int oflag) {
+  int mode = S_IRUSR | S_IWUSR;
+#if defined(_WIN32) && !defined(__MINGW32__)
+  fd_ = -1;
+  FMT_POSIX_CALL(sopen_s(&fd_, path.c_str(), oflag, _SH_DENYNO, mode));
+#else
+  FMT_RETRY(fd_, FMT_POSIX_CALL(open(path.c_str(), oflag, mode)));
+#endif
+  if (fd_ == -1)
+    FMT_THROW(SystemError(errno, "cannot open file {}", path));
+}
+
+fmt::File::~File() FMT_NOEXCEPT {
+  // Don't retry close in case of EINTR!
+  // See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
+  if (fd_ != -1 && FMT_POSIX_CALL(close(fd_)) != 0)
+    fmt::report_system_error(errno, "cannot close file");
+}
+
+void fmt::File::close() {
+  if (fd_ == -1)
+    return;
+  // Don't retry close in case of EINTR!
+  // See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
+  int result = FMT_POSIX_CALL(close(fd_));
+  fd_ = -1;
+  if (result != 0)
+    FMT_THROW(SystemError(errno, "cannot close file"));
+}
+
+fmt::LongLong fmt::File::size() const {
+#ifdef _WIN32
+  // Use GetFileSize instead of GetFileSizeEx for the case when _WIN32_WINNT
+  // is less than 0x0500 as is the case with some default MinGW builds.
+  // Both functions support large file sizes.
+  DWORD size_upper = 0;
+  HANDLE handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd_));
+  DWORD size_lower = FMT_SYSTEM(GetFileSize(handle, &size_upper));
+  if (size_lower == INVALID_FILE_SIZE) {
+    DWORD error = GetLastError();
+    if (error != NO_ERROR)
+      FMT_THROW(WindowsError(GetLastError(), "cannot get file size"));
+  }
+  fmt::ULongLong long_size = size_upper;
+  return (long_size << sizeof(DWORD) * CHAR_BIT) | size_lower;
+#else
+  typedef struct stat Stat;
+  Stat file_stat = Stat();
+  if (FMT_POSIX_CALL(fstat(fd_, &file_stat)) == -1)
+    FMT_THROW(SystemError(errno, "cannot get file attributes"));
+  FMT_STATIC_ASSERT(sizeof(fmt::LongLong) >= sizeof(file_stat.st_size),
+      "return type of File::size is not large enough");
+  return file_stat.st_size;
+#endif
+}
+
+std::size_t fmt::File::read(void *buffer, std::size_t count) {
+  RWResult result = 0;
+  FMT_RETRY(result, FMT_POSIX_CALL(read(fd_, buffer, convert_rwcount(count))));
+  if (result < 0)
+    FMT_THROW(SystemError(errno, "cannot read from file"));
+  return internal::to_unsigned(result);
+}
+
+std::size_t fmt::File::write(const void *buffer, std::size_t count) {
+  RWResult result = 0;
+  FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, convert_rwcount(count))));
+  if (result < 0)
+    FMT_THROW(SystemError(errno, "cannot write to file"));
+  return internal::to_unsigned(result);
+}
+
+fmt::File fmt::File::dup(int fd) {
+  // Don't retry as dup doesn't return EINTR.
+  // http://pubs.opengroup.org/onlinepubs/009695399/functions/dup.html
+  int new_fd = FMT_POSIX_CALL(dup(fd));
+  if (new_fd == -1)
+    FMT_THROW(SystemError(errno, "cannot duplicate file descriptor {}", fd));
+  return File(new_fd);
+}
+
+void fmt::File::dup2(int fd) {
+  int result = 0;
+  FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
+  if (result == -1) {
+    FMT_THROW(SystemError(errno,
+      "cannot duplicate file descriptor {} to {}", fd_, fd));
+  }
+}
+
+void fmt::File::dup2(int fd, ErrorCode &ec) FMT_NOEXCEPT {
+  int result = 0;
+  FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
+  if (result == -1)
+    ec = ErrorCode(errno);
+}
+
+void fmt::File::pipe(File &read_end, File &write_end) {
+  // Close the descriptors first to make sure that assignments don't throw
+  // and there are no leaks.
+  read_end.close();
+  write_end.close();
+  int fds[2] = {};
+#ifdef _WIN32
+  // Make the default pipe capacity same as on Linux 2.6.11+.
+  enum { DEFAULT_CAPACITY = 65536 };
+  int result = FMT_POSIX_CALL(pipe(fds, DEFAULT_CAPACITY, _O_BINARY));
+#else
+  // Don't retry as the pipe function doesn't return EINTR.
+  // http://pubs.opengroup.org/onlinepubs/009696799/functions/pipe.html
+  int result = FMT_POSIX_CALL(pipe(fds));
+#endif
+  if (result != 0)
+    FMT_THROW(SystemError(errno, "cannot create pipe"));
+  // The following assignments don't throw because read_fd and write_fd
+  // are closed.
+  read_end = File(fds[0]);
+  write_end = File(fds[1]);
+}
+
+fmt::BufferedFile fmt::File::fdopen(const char *mode) {
+  // Don't retry as fdopen doesn't return EINTR.
+  FILE *f = FMT_POSIX_CALL(fdopen(fd_, mode));
+  if (!f)
+    FMT_THROW(SystemError(errno, "cannot associate stream with file descriptor"));
+  BufferedFile file(f);
+  fd_ = -1;
+  return file;
+}
+
+long fmt::getpagesize() {
+#ifdef _WIN32
+  SYSTEM_INFO si;
+  GetSystemInfo(&si);
+  return si.dwPageSize;
+#else
+  long size = FMT_POSIX_CALL(sysconf(_SC_PAGESIZE));
+  if (size < 0)
+    FMT_THROW(SystemError(errno, "cannot get memory page size"));
+  return size;
+#endif
+}
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/posix.h b/3d_party/spd_log/include/spdlog/fmt/bundled/posix.h
new file mode 100644
index 000000000..693272500
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/posix.h
@@ -0,0 +1,424 @@
+/*
+ A C++ interface to POSIX functions.
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#ifndef FMT_POSIX_H_
+#define FMT_POSIX_H_
+
+#if defined(__MINGW32__) || defined(__CYGWIN__)
+// Workaround MinGW bug https://sourceforge.net/p/mingw/bugs/2024/.
+# undef __STRICT_ANSI__
+#endif
+
+#include <errno.h>
+#include <fcntl.h>   // for O_RDONLY
+#include <locale.h>  // for locale_t
+#include <stdio.h>
+#include <stdlib.h>  // for strtod_l
+
+#include <cstddef>
+
+#if defined __APPLE__ || defined(__FreeBSD__)
+# include <xlocale.h>  // for LC_NUMERIC_MASK on OS X
+#endif
+
+#include "format.h"
+
+#ifndef FMT_POSIX
+# if defined(_WIN32) && !defined(__MINGW32__)
+// Fix warnings about deprecated symbols.
+#  define FMT_POSIX(call) _##call
+# else
+#  define FMT_POSIX(call) call
+# endif
+#endif
+
+// Calls to system functions are wrapped in FMT_SYSTEM for testability.
+#ifdef FMT_SYSTEM
+# define FMT_POSIX_CALL(call) FMT_SYSTEM(call)
+#else
+# define FMT_SYSTEM(call) call
+# ifdef _WIN32
+// Fix warnings about deprecated symbols.
+#  define FMT_POSIX_CALL(call) ::_##call
+# else
+#  define FMT_POSIX_CALL(call) ::call
+# endif
+#endif
+
+// Retries the expression while it evaluates to error_result and errno
+// equals to EINTR.
+#ifndef _WIN32
+# define FMT_RETRY_VAL(result, expression, error_result) \
+  do { \
+    result = (expression); \
+  } while (result == error_result && errno == EINTR)
+#else
+# define FMT_RETRY_VAL(result, expression, error_result) result = (expression)
+#endif
+
+#define FMT_RETRY(result, expression) FMT_RETRY_VAL(result, expression, -1)
+
+namespace fmt
+{
+
+// An error code.
+class ErrorCode
+{
+private:
+    int value_;
+
+public:
+explicit ErrorCode(int value = 0) FMT_NOEXCEPT :
+    value_(value) {}
+
+    int get() const FMT_NOEXCEPT
+    {
+        return value_;
+    }
+};
+
+// A buffered file.
+class BufferedFile
+{
+private:
+    FILE *file_;
+
+    friend class File;
+
+    explicit BufferedFile(FILE *f) : file_(f) {}
+
+public:
+    // Constructs a BufferedFile object which doesn't represent any file.
+BufferedFile() FMT_NOEXCEPT :
+    file_(FMT_NULL) {}
+
+    // Destroys the object closing the file it represents if any.
+    FMT_API ~BufferedFile() FMT_NOEXCEPT;
+
+#if !FMT_USE_RVALUE_REFERENCES
+    // Emulate a move constructor and a move assignment operator if rvalue
+    // references are not supported.
+
+private:
+    // A proxy object to emulate a move constructor.
+    // It is private to make it impossible call operator Proxy directly.
+    struct Proxy
+    {
+        FILE *file;
+    };
+
+public:
+    // A "move constructor" for moving from a temporary.
+BufferedFile(Proxy p) FMT_NOEXCEPT :
+    file_(p.file) {}
+
+    // A "move constructor" for moving from an lvalue.
+BufferedFile(BufferedFile &f) FMT_NOEXCEPT :
+    file_(f.file_)
+    {
+        f.file_ = FMT_NULL;
+    }
+
+    // A "move assignment operator" for moving from a temporary.
+    BufferedFile &operator=(Proxy p)
+    {
+        close();
+        file_ = p.file;
+        return *this;
+    }
+
+    // A "move assignment operator" for moving from an lvalue.
+    BufferedFile &operator=(BufferedFile &other)
+    {
+        close();
+        file_ = other.file_;
+        other.file_ = FMT_NULL;
+        return *this;
+    }
+
+    // Returns a proxy object for moving from a temporary:
+    //   BufferedFile file = BufferedFile(...);
+    operator Proxy() FMT_NOEXCEPT
+    {
+        Proxy p = {file_};
+        file_ = FMT_NULL;
+        return p;
+    }
+
+#else
+private:
+    FMT_DISALLOW_COPY_AND_ASSIGN(BufferedFile);
+
+public:
+BufferedFile(BufferedFile &&other) FMT_NOEXCEPT :
+    file_(other.file_)
+    {
+        other.file_ = FMT_NULL;
+    }
+
+    BufferedFile& operator=(BufferedFile &&other)
+    {
+        close();
+        file_ = other.file_;
+        other.file_ = FMT_NULL;
+        return *this;
+    }
+#endif
+
+    // Opens a file.
+    FMT_API BufferedFile(CStringRef filename, CStringRef mode);
+
+    // Closes the file.
+    FMT_API void close();
+
+    // Returns the pointer to a FILE object representing this file.
+    FILE *get() const FMT_NOEXCEPT
+    {
+        return file_;
+    }
+
+    // We place parentheses around fileno to workaround a bug in some versions
+    // of MinGW that define fileno as a macro.
+    FMT_API int (fileno)() const;
+
+    void print(CStringRef format_str, const ArgList &args)
+    {
+        fmt::print(file_, format_str, args);
+    }
+    FMT_VARIADIC(void, print, CStringRef)
+};
+
+// A file. Closed file is represented by a File object with descriptor -1.
+// Methods that are not declared with FMT_NOEXCEPT may throw
+// fmt::SystemError in case of failure. Note that some errors such as
+// closing the file multiple times will cause a crash on Windows rather
+// than an exception. You can get standard behavior by overriding the
+// invalid parameter handler with _set_invalid_parameter_handler.
+class File
+{
+private:
+    int fd_;  // File descriptor.
+
+    // Constructs a File object with a given descriptor.
+    explicit File(int fd) : fd_(fd) {}
+
+public:
+    // Possible values for the oflag argument to the constructor.
+    enum
+    {
+        RDONLY = FMT_POSIX(O_RDONLY), // Open for reading only.
+        WRONLY = FMT_POSIX(O_WRONLY), // Open for writing only.
+        RDWR   = FMT_POSIX(O_RDWR)    // Open for reading and writing.
+    };
+
+    // Constructs a File object which doesn't represent any file.
+File() FMT_NOEXCEPT :
+    fd_(-1) {}
+
+    // Opens a file and constructs a File object representing this file.
+    FMT_API File(CStringRef path, int oflag);
+
+#if !FMT_USE_RVALUE_REFERENCES
+    // Emulate a move constructor and a move assignment operator if rvalue
+    // references are not supported.
+
+private:
+    // A proxy object to emulate a move constructor.
+    // It is private to make it impossible call operator Proxy directly.
+    struct Proxy
+    {
+        int fd;
+    };
+
+public:
+    // A "move constructor" for moving from a temporary.
+File(Proxy p) FMT_NOEXCEPT :
+    fd_(p.fd) {}
+
+    // A "move constructor" for moving from an lvalue.
+File(File &other) FMT_NOEXCEPT :
+    fd_(other.fd_)
+    {
+        other.fd_ = -1;
+    }
+
+    // A "move assignment operator" for moving from a temporary.
+    File &operator=(Proxy p)
+    {
+        close();
+        fd_ = p.fd;
+        return *this;
+    }
+
+    // A "move assignment operator" for moving from an lvalue.
+    File &operator=(File &other)
+    {
+        close();
+        fd_ = other.fd_;
+        other.fd_ = -1;
+        return *this;
+    }
+
+    // Returns a proxy object for moving from a temporary:
+    //   File file = File(...);
+    operator Proxy() FMT_NOEXCEPT
+    {
+        Proxy p = {fd_};
+        fd_ = -1;
+        return p;
+    }
+
+#else
+private:
+    FMT_DISALLOW_COPY_AND_ASSIGN(File);
+
+public:
+File(File &&other) FMT_NOEXCEPT :
+    fd_(other.fd_)
+    {
+        other.fd_ = -1;
+    }
+
+    File& operator=(File &&other)
+    {
+        close();
+        fd_ = other.fd_;
+        other.fd_ = -1;
+        return *this;
+    }
+#endif
+
+    // Destroys the object closing the file it represents if any.
+    FMT_API ~File() FMT_NOEXCEPT;
+
+    // Returns the file descriptor.
+    int descriptor() const FMT_NOEXCEPT
+    {
+        return fd_;
+    }
+
+    // Closes the file.
+    FMT_API void close();
+
+    // Returns the file size. The size has signed type for consistency with
+    // stat::st_size.
+    FMT_API LongLong size() const;
+
+    // Attempts to read count bytes from the file into the specified buffer.
+    FMT_API std::size_t read(void *buffer, std::size_t count);
+
+    // Attempts to write count bytes from the specified buffer to the file.
+    FMT_API std::size_t write(const void *buffer, std::size_t count);
+
+    // Duplicates a file descriptor with the dup function and returns
+    // the duplicate as a file object.
+    FMT_API static File dup(int fd);
+
+    // Makes fd be the copy of this file descriptor, closing fd first if
+    // necessary.
+    FMT_API void dup2(int fd);
+
+    // Makes fd be the copy of this file descriptor, closing fd first if
+    // necessary.
+    FMT_API void dup2(int fd, ErrorCode &ec) FMT_NOEXCEPT;
+
+    // Creates a pipe setting up read_end and write_end file objects for reading
+    // and writing respectively.
+    FMT_API static void pipe(File &read_end, File &write_end);
+
+    // Creates a BufferedFile object associated with this file and detaches
+    // this File object from the file.
+    FMT_API BufferedFile fdopen(const char *mode);
+};
+
+// Returns the memory page size.
+long getpagesize();
+
+#if (defined(LC_NUMERIC_MASK) || defined(_MSC_VER)) && \
+    !defined(__ANDROID__) && !defined(__CYGWIN__)
+# define FMT_LOCALE
+#endif
+
+#ifdef FMT_LOCALE
+// A "C" numeric locale.
+class Locale
+{
+private:
+# ifdef _MSC_VER
+    typedef _locale_t locale_t;
+
+    enum { LC_NUMERIC_MASK = LC_NUMERIC };
+
+    static locale_t newlocale(int category_mask, const char *locale, locale_t)
+    {
+        return _create_locale(category_mask, locale);
+    }
+
+    static void freelocale(locale_t locale)
+    {
+        _free_locale(locale);
+    }
+
+    static double strtod_l(const char *nptr, char **endptr, _locale_t locale)
+    {
+        return _strtod_l(nptr, endptr, locale);
+    }
+# endif
+
+    locale_t locale_;
+
+    FMT_DISALLOW_COPY_AND_ASSIGN(Locale);
+
+public:
+    typedef locale_t Type;
+
+    Locale() : locale_(newlocale(LC_NUMERIC_MASK, "C", FMT_NULL))
+    {
+        if (!locale_)
+            FMT_THROW(fmt::SystemError(errno, "cannot create locale"));
+    }
+    ~Locale()
+    {
+        freelocale(locale_);
+    }
+
+    Type get() const
+    {
+        return locale_;
+    }
+
+    // Converts string to floating-point number and advances str past the end
+    // of the parsed input.
+    double strtod(const char *&str) const
+    {
+        char *end = FMT_NULL;
+        double result = strtod_l(str, &end, locale_);
+        str = end;
+        return result;
+    }
+};
+#endif  // FMT_LOCALE
+}  // namespace fmt
+
+#if !FMT_USE_RVALUE_REFERENCES
+namespace std
+{
+// For compatibility with C++98.
+inline fmt::BufferedFile &move(fmt::BufferedFile &f)
+{
+    return f;
+}
+inline fmt::File &move(fmt::File &f)
+{
+    return f;
+}
+}
+#endif
+
+#endif  // FMT_POSIX_H_
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/printf.cc b/3d_party/spd_log/include/spdlog/fmt/bundled/printf.cc
new file mode 100644
index 000000000..95d7a36ab
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/printf.cc
@@ -0,0 +1,32 @@
+/*
+ Formatting library for C++
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#include "format.h"
+#include "printf.h"
+
+namespace fmt {
+
+template <typename Char>
+void printf(BasicWriter<Char> &w, BasicCStringRef<Char> format, ArgList args);
+
+FMT_FUNC int fprintf(std::FILE *f, CStringRef format, ArgList args) {
+  MemoryWriter w;
+  printf(w, format, args);
+  std::size_t size = w.size();
+  return std::fwrite(w.data(), 1, size, f) < size ? -1 : static_cast<int>(size);
+}
+
+#ifndef FMT_HEADER_ONLY
+
+template void PrintfFormatter<char>::format(CStringRef format);
+template void PrintfFormatter<wchar_t>::format(WCStringRef format);
+
+#endif  // FMT_HEADER_ONLY
+
+}  // namespace fmt
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/printf.h b/3d_party/spd_log/include/spdlog/fmt/bundled/printf.h
new file mode 100644
index 000000000..7861b460e
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/printf.h
@@ -0,0 +1,712 @@
+/*
+ Formatting library for C++
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#ifndef FMT_PRINTF_H_
+#define FMT_PRINTF_H_
+
+#include <algorithm>  // std::fill_n
+#include <limits>     // std::numeric_limits
+
+#include "ostream.h"
+
+namespace fmt
+{
+namespace internal
+{
+
+// Checks if a value fits in int - used to avoid warnings about comparing
+// signed and unsigned integers.
+template <bool IsSigned>
+struct IntChecker
+{
+    template <typename T>
+    static bool fits_in_int(T value)
+    {
+        unsigned max = std::numeric_limits<int>::max();
+        return value <= max;
+    }
+    static bool fits_in_int(bool)
+    {
+        return true;
+    }
+};
+
+template <>
+struct IntChecker<true>
+{
+    template <typename T>
+    static bool fits_in_int(T value)
+    {
+        return value >= std::numeric_limits<int>::min() &&
+               value <= std::numeric_limits<int>::max();
+    }
+    static bool fits_in_int(int)
+    {
+        return true;
+    }
+};
+
+class PrecisionHandler : public ArgVisitor<PrecisionHandler, int>
+{
+public:
+    void report_unhandled_arg()
+    {
+        FMT_THROW(FormatError("precision is not integer"));
+    }
+
+    template <typename T>
+    int visit_any_int(T value)
+    {
+        if (!IntChecker<std::numeric_limits<T>::is_signed>::fits_in_int(value))
+            FMT_THROW(FormatError("number is too big"));
+        return static_cast<int>(value);
+    }
+};
+
+// IsZeroInt::visit(arg) returns true iff arg is a zero integer.
+class IsZeroInt : public ArgVisitor<IsZeroInt, bool>
+{
+public:
+    template <typename T>
+    bool visit_any_int(T value)
+    {
+        return value == 0;
+    }
+};
+
+// returns the default type for format specific "%s"
+class DefaultType : public ArgVisitor<DefaultType, char>
+{
+public:
+    char visit_char(int)
+    {
+        return 'c';
+    }
+
+    char visit_bool(bool)
+    {
+        return 's';
+    }
+
+    char visit_pointer(const void *)
+    {
+        return 'p';
+    }
+
+    template <typename T>
+    char visit_any_int(T)
+    {
+        return 'd';
+    }
+
+    template <typename T>
+    char visit_any_double(T)
+    {
+        return 'g';
+    }
+
+    char visit_unhandled_arg()
+    {
+        return 's';
+    }
+};
+
+template <typename T, typename U>
+struct is_same
+{
+    enum { value = 0 };
+};
+
+template <typename T>
+struct is_same<T, T>
+{
+    enum { value = 1 };
+};
+
+// An argument visitor that converts an integer argument to T for printf,
+// if T is an integral type. If T is void, the argument is converted to
+// corresponding signed or unsigned type depending on the type specifier:
+// 'd' and 'i' - signed, other - unsigned)
+template <typename T = void>
+class ArgConverter : public ArgVisitor<ArgConverter<T>, void>
+{
+private:
+    internal::Arg &arg_;
+    wchar_t type_;
+
+    FMT_DISALLOW_COPY_AND_ASSIGN(ArgConverter);
+
+public:
+    ArgConverter(internal::Arg &arg, wchar_t type)
+        : arg_(arg), type_(type) {}
+
+    void visit_bool(bool value)
+    {
+        if (type_ != 's')
+            visit_any_int(value);
+    }
+
+    void visit_char(char value)
+    {
+        if (type_ != 's')
+            visit_any_int(value);
+    }
+
+    template <typename U>
+    void visit_any_int(U value)
+    {
+        bool is_signed = type_ == 'd' || type_ == 'i';
+        if (type_ == 's')
+        {
+            is_signed = std::numeric_limits<U>::is_signed;
+        }
+
+        using internal::Arg;
+        typedef typename internal::Conditional<
+        is_same<T, void>::value, U, T>::type TargetType;
+        if (sizeof(TargetType) <= sizeof(int))
+        {
+            // Extra casts are used to silence warnings.
+            if (is_signed)
+            {
+                arg_.type = Arg::INT;
+                arg_.int_value = static_cast<int>(static_cast<TargetType>(value));
+            }
+            else
+            {
+                arg_.type = Arg::UINT;
+                typedef typename internal::MakeUnsigned<TargetType>::Type Unsigned;
+                arg_.uint_value = static_cast<unsigned>(static_cast<Unsigned>(value));
+            }
+        }
+        else
+        {
+            if (is_signed)
+            {
+                arg_.type = Arg::LONG_LONG;
+                // glibc's printf doesn't sign extend arguments of smaller types:
+                //   std::printf("%lld", -42);  // prints "4294967254"
+                // but we don't have to do the same because it's a UB.
+                arg_.long_long_value = static_cast<LongLong>(value);
+            }
+            else
+            {
+                arg_.type = Arg::ULONG_LONG;
+                arg_.ulong_long_value =
+                    static_cast<typename internal::MakeUnsigned<U>::Type>(value);
+            }
+        }
+    }
+};
+
+// Converts an integer argument to char for printf.
+class CharConverter : public ArgVisitor<CharConverter, void>
+{
+private:
+    internal::Arg &arg_;
+
+    FMT_DISALLOW_COPY_AND_ASSIGN(CharConverter);
+
+public:
+    explicit CharConverter(internal::Arg &arg) : arg_(arg) {}
+
+    template <typename T>
+    void visit_any_int(T value)
+    {
+        arg_.type = internal::Arg::CHAR;
+        arg_.int_value = static_cast<char>(value);
+    }
+};
+
+// Checks if an argument is a valid printf width specifier and sets
+// left alignment if it is negative.
+class WidthHandler : public ArgVisitor<WidthHandler, unsigned>
+{
+private:
+    FormatSpec &spec_;
+
+    FMT_DISALLOW_COPY_AND_ASSIGN(WidthHandler);
+
+public:
+    explicit WidthHandler(FormatSpec &spec) : spec_(spec) {}
+
+    void report_unhandled_arg()
+    {
+        FMT_THROW(FormatError("width is not integer"));
+    }
+
+    template <typename T>
+    unsigned visit_any_int(T value)
+    {
+        typedef typename internal::IntTraits<T>::MainType UnsignedType;
+        UnsignedType width = static_cast<UnsignedType>(value);
+        if (internal::is_negative(value))
+        {
+            spec_.align_ = ALIGN_LEFT;
+            width = 0 - width;
+        }
+        unsigned int_max = std::numeric_limits<int>::max();
+        if (width > int_max)
+            FMT_THROW(FormatError("number is too big"));
+        return static_cast<unsigned>(width);
+    }
+};
+}  // namespace internal
+
+/**
+  \rst
+  A ``printf`` argument formatter based on the `curiously recurring template
+  pattern <http://en.wikipedia.org/wiki/Curiously_recurring_template_pattern>`_.
+
+  To use `~fmt::BasicPrintfArgFormatter` define a subclass that implements some
+  or all of the visit methods with the same signatures as the methods in
+  `~fmt::ArgVisitor`, for example, `~fmt::ArgVisitor::visit_int()`.
+  Pass the subclass as the *Impl* template parameter. When a formatting
+  function processes an argument, it will dispatch to a visit method
+  specific to the argument type. For example, if the argument type is
+  ``double`` then the `~fmt::ArgVisitor::visit_double()` method of a subclass
+  will be called. If the subclass doesn't contain a method with this signature,
+  then a corresponding method of `~fmt::BasicPrintfArgFormatter` or its
+  superclass will be called.
+  \endrst
+ */
+template <typename Impl, typename Char, typename Spec>
+class BasicPrintfArgFormatter :
+    public internal::ArgFormatterBase<Impl, Char, Spec>
+{
+private:
+    void write_null_pointer()
+    {
+        this->spec().type_ = 0;
+        this->write("(nil)");
+    }
+
+    typedef internal::ArgFormatterBase<Impl, Char, Spec> Base;
+
+public:
+    /**
+      \rst
+      Constructs an argument formatter object.
+      *writer* is a reference to the output writer and *spec* contains format
+      specifier information for standard argument types.
+      \endrst
+     */
+    BasicPrintfArgFormatter(BasicWriter<Char> &w, Spec &s)
+        : internal::ArgFormatterBase<Impl, Char, Spec>(w, s) {}
+
+    /** Formats an argument of type ``bool``. */
+    void visit_bool(bool value)
+    {
+        Spec &fmt_spec = this->spec();
+        if (fmt_spec.type_ != 's')
+            return this->visit_any_int(value);
+        fmt_spec.type_ = 0;
+        this->write(value);
+    }
+
+    /** Formats a character. */
+    void visit_char(int value)
+    {
+        const Spec &fmt_spec = this->spec();
+        BasicWriter<Char> &w = this->writer();
+        if (fmt_spec.type_ && fmt_spec.type_ != 'c')
+            w.write_int(value, fmt_spec);
+        typedef typename BasicWriter<Char>::CharPtr CharPtr;
+        CharPtr out = CharPtr();
+        if (fmt_spec.width_ > 1)
+        {
+            Char fill = ' ';
+            out = w.grow_buffer(fmt_spec.width_);
+            if (fmt_spec.align_ != ALIGN_LEFT)
+            {
+                std::fill_n(out, fmt_spec.width_ - 1, fill);
+                out += fmt_spec.width_ - 1;
+            }
+            else
+            {
+                std::fill_n(out + 1, fmt_spec.width_ - 1, fill);
+            }
+        }
+        else
+        {
+            out = w.grow_buffer(1);
+        }
+        *out = static_cast<Char>(value);
+    }
+
+    /** Formats a null-terminated C string. */
+    void visit_cstring(const char *value)
+    {
+        if (value)
+            Base::visit_cstring(value);
+        else if (this->spec().type_ == 'p')
+            write_null_pointer();
+        else
+            this->write("(null)");
+    }
+
+    /** Formats a pointer. */
+    void visit_pointer(const void *value)
+    {
+        if (value)
+            return Base::visit_pointer(value);
+        this->spec().type_ = 0;
+        write_null_pointer();
+    }
+
+    /** Formats an argument of a custom (user-defined) type. */
+    void visit_custom(internal::Arg::CustomValue c)
+    {
+        BasicFormatter<Char> formatter(ArgList(), this->writer());
+        const Char format_str[] = {'}', 0};
+        const Char *format = format_str;
+        c.format(&formatter, c.value, &format);
+    }
+};
+
+/** The default printf argument formatter. */
+template <typename Char>
+class PrintfArgFormatter :
+    public BasicPrintfArgFormatter<PrintfArgFormatter<Char>, Char, FormatSpec>
+{
+public:
+    /** Constructs an argument formatter object. */
+    PrintfArgFormatter(BasicWriter<Char> &w, FormatSpec &s)
+        : BasicPrintfArgFormatter<PrintfArgFormatter<Char>, Char, FormatSpec>(w, s) {}
+};
+
+/** This template formats data and writes the output to a writer. */
+template <typename Char, typename ArgFormatter = PrintfArgFormatter<Char> >
+class PrintfFormatter : private internal::FormatterBase
+{
+private:
+    BasicWriter<Char> &writer_;
+
+    void parse_flags(FormatSpec &spec, const Char *&s);
+
+    // Returns the argument with specified index or, if arg_index is equal
+    // to the maximum unsigned value, the next argument.
+    internal::Arg get_arg(
+        const Char *s,
+        unsigned arg_index = (std::numeric_limits<unsigned>::max)());
+
+    // Parses argument index, flags and width and returns the argument index.
+    unsigned parse_header(const Char *&s, FormatSpec &spec);
+
+public:
+    /**
+     \rst
+     Constructs a ``PrintfFormatter`` object. References to the arguments and
+     the writer are stored in the formatter object so make sure they have
+     appropriate lifetimes.
+     \endrst
+     */
+    explicit PrintfFormatter(const ArgList &al, BasicWriter<Char> &w)
+        : FormatterBase(al), writer_(w) {}
+
+    /** Formats stored arguments and writes the output to the writer. */
+    void format(BasicCStringRef<Char> format_str);
+};
+
+template <typename Char, typename AF>
+void PrintfFormatter<Char, AF>::parse_flags(FormatSpec &spec, const Char *&s)
+{
+    for (;;)
+    {
+        switch (*s++)
+        {
+        case '-':
+            spec.align_ = ALIGN_LEFT;
+            break;
+        case '+':
+            spec.flags_ |= SIGN_FLAG | PLUS_FLAG;
+            break;
+        case '0':
+            spec.fill_ = '0';
+            break;
+        case ' ':
+            spec.flags_ |= SIGN_FLAG;
+            break;
+        case '#':
+            spec.flags_ |= HASH_FLAG;
+            break;
+        default:
+            --s;
+            return;
+        }
+    }
+}
+
+template <typename Char, typename AF>
+internal::Arg PrintfFormatter<Char, AF>::get_arg(const Char *s,
+        unsigned arg_index)
+{
+    (void)s;
+    const char *error = FMT_NULL;
+    internal::Arg arg = arg_index == std::numeric_limits<unsigned>::max() ?
+                        next_arg(error) : FormatterBase::get_arg(arg_index - 1, error);
+    if (error)
+        FMT_THROW(FormatError(!*s ? "invalid format string" : error));
+    return arg;
+}
+
+template <typename Char, typename AF>
+unsigned PrintfFormatter<Char, AF>::parse_header(
+    const Char *&s, FormatSpec &spec)
+{
+    unsigned arg_index = std::numeric_limits<unsigned>::max();
+    Char c = *s;
+    if (c >= '0' && c <= '9')
+    {
+        // Parse an argument index (if followed by '$') or a width possibly
+        // preceded with '0' flag(s).
+        unsigned value = internal::parse_nonnegative_int(s);
+        if (*s == '$')    // value is an argument index
+        {
+            ++s;
+            arg_index = value;
+        }
+        else
+        {
+            if (c == '0')
+                spec.fill_ = '0';
+            if (value != 0)
+            {
+                // Nonzero value means that we parsed width and don't need to
+                // parse it or flags again, so return now.
+                spec.width_ = value;
+                return arg_index;
+            }
+        }
+    }
+    parse_flags(spec, s);
+    // Parse width.
+    if (*s >= '0' && *s <= '9')
+    {
+        spec.width_ = internal::parse_nonnegative_int(s);
+    }
+    else if (*s == '*')
+    {
+        ++s;
+        spec.width_ = internal::WidthHandler(spec).visit(get_arg(s));
+    }
+    return arg_index;
+}
+
+template <typename Char, typename AF>
+void PrintfFormatter<Char, AF>::format(BasicCStringRef<Char> format_str)
+{
+    const Char *start = format_str.c_str();
+    const Char *s = start;
+    while (*s)
+    {
+        Char c = *s++;
+        if (c != '%') continue;
+        if (*s == c)
+        {
+            write(writer_, start, s);
+            start = ++s;
+            continue;
+        }
+        write(writer_, start, s - 1);
+
+        FormatSpec spec;
+        spec.align_ = ALIGN_RIGHT;
+
+        // Parse argument index, flags and width.
+        unsigned arg_index = parse_header(s, spec);
+
+        // Parse precision.
+        if (*s == '.')
+        {
+            ++s;
+            if ('0' <= *s && *s <= '9')
+            {
+                spec.precision_ = static_cast<int>(internal::parse_nonnegative_int(s));
+            }
+            else if (*s == '*')
+            {
+                ++s;
+                spec.precision_ = internal::PrecisionHandler().visit(get_arg(s));
+            }
+            else
+            {
+                spec.precision_ = 0;
+            }
+        }
+
+        using internal::Arg;
+        Arg arg = get_arg(s, arg_index);
+        if (spec.flag(HASH_FLAG) && internal::IsZeroInt().visit(arg))
+            spec.flags_ &= ~internal::to_unsigned<int>(HASH_FLAG);
+        if (spec.fill_ == '0')
+        {
+            if (arg.type <= Arg::LAST_NUMERIC_TYPE)
+                spec.align_ = ALIGN_NUMERIC;
+            else
+                spec.fill_ = ' ';  // Ignore '0' flag for non-numeric types.
+        }
+
+        // Parse length and convert the argument to the required type.
+        using internal::ArgConverter;
+        switch (*s++)
+        {
+        case 'h':
+            if (*s == 'h')
+                ArgConverter<signed char>(arg, *++s).visit(arg);
+            else
+                ArgConverter<short>(arg, *s).visit(arg);
+            break;
+        case 'l':
+            if (*s == 'l')
+                ArgConverter<fmt::LongLong>(arg, *++s).visit(arg);
+            else
+                ArgConverter<long>(arg, *s).visit(arg);
+            break;
+        case 'j':
+            ArgConverter<intmax_t>(arg, *s).visit(arg);
+            break;
+        case 'z':
+            ArgConverter<std::size_t>(arg, *s).visit(arg);
+            break;
+        case 't':
+            ArgConverter<std::ptrdiff_t>(arg, *s).visit(arg);
+            break;
+        case 'L':
+            // printf produces garbage when 'L' is omitted for long double, no
+            // need to do the same.
+            break;
+        default:
+            --s;
+            ArgConverter<void>(arg, *s).visit(arg);
+        }
+
+        // Parse type.
+        if (!*s)
+            FMT_THROW(FormatError("invalid format string"));
+        spec.type_ = static_cast<char>(*s++);
+
+        if (spec.type_ == 's')
+        {
+            // set the format type to the default if 's' is specified
+            spec.type_ = internal::DefaultType().visit(arg);
+        }
+
+        if (arg.type <= Arg::LAST_INTEGER_TYPE)
+        {
+            // Normalize type.
+            switch (spec.type_)
+            {
+            case 'i':
+            case 'u':
+                spec.type_ = 'd';
+                break;
+            case 'c':
+                // TODO: handle wchar_t
+                internal::CharConverter(arg).visit(arg);
+                break;
+            }
+        }
+
+        start = s;
+
+        // Format argument.
+        AF(writer_, spec).visit(arg);
+    }
+    write(writer_, start, s);
+}
+
+inline void printf(Writer &w, CStringRef format, ArgList args)
+{
+    PrintfFormatter<char>(args, w).format(format);
+}
+FMT_VARIADIC(void, printf, Writer &, CStringRef)
+
+inline void printf(WWriter &w, WCStringRef format, ArgList args)
+{
+    PrintfFormatter<wchar_t>(args, w).format(format);
+}
+FMT_VARIADIC(void, printf, WWriter &, WCStringRef)
+
+/**
+  \rst
+  Formats arguments and returns the result as a string.
+
+  **Example**::
+
+    std::string message = fmt::sprintf("The answer is %d", 42);
+  \endrst
+*/
+inline std::string sprintf(CStringRef format, ArgList args)
+{
+    MemoryWriter w;
+    printf(w, format, args);
+    return w.str();
+}
+FMT_VARIADIC(std::string, sprintf, CStringRef)
+
+inline std::wstring sprintf(WCStringRef format, ArgList args)
+{
+    WMemoryWriter w;
+    printf(w, format, args);
+    return w.str();
+}
+FMT_VARIADIC_W(std::wstring, sprintf, WCStringRef)
+
+/**
+  \rst
+  Prints formatted data to the file *f*.
+
+  **Example**::
+
+    fmt::fprintf(stderr, "Don't %s!", "panic");
+  \endrst
+ */
+FMT_API int fprintf(std::FILE *f, CStringRef format, ArgList args);
+FMT_VARIADIC(int, fprintf, std::FILE *, CStringRef)
+
+/**
+  \rst
+  Prints formatted data to ``stdout``.
+
+  **Example**::
+
+    fmt::printf("Elapsed time: %.2f seconds", 1.23);
+  \endrst
+ */
+inline int printf(CStringRef format, ArgList args)
+{
+    return fprintf(stdout, format, args);
+}
+FMT_VARIADIC(int, printf, CStringRef)
+
+/**
+  \rst
+  Prints formatted data to the stream *os*.
+
+  **Example**::
+
+    fprintf(cerr, "Don't %s!", "panic");
+  \endrst
+ */
+inline int fprintf(std::ostream &os, CStringRef format_str, ArgList args)
+{
+    MemoryWriter w;
+    printf(w, format_str, args);
+    internal::write(os, w);
+    return static_cast<int>(w.size());
+}
+FMT_VARIADIC(int, fprintf, std::ostream &, CStringRef)
+}  // namespace fmt
+
+#ifdef FMT_HEADER_ONLY
+# include "printf.cc"
+#endif
+
+#endif  // FMT_PRINTF_H_
diff --git a/3d_party/spd_log/include/spdlog/fmt/bundled/time.h b/3d_party/spd_log/include/spdlog/fmt/bundled/time.h
new file mode 100644
index 000000000..206d09209
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/bundled/time.h
@@ -0,0 +1,183 @@
+/*
+ Formatting library for C++ - time formatting
+
+ Copyright (c) 2012 - 2016, Victor Zverovich
+ All rights reserved.
+
+ For the license information refer to format.h.
+ */
+
+#ifndef FMT_TIME_H_
+#define FMT_TIME_H_
+
+#include "format.h"
+#include <ctime>
+
+#ifdef _MSC_VER
+# pragma warning(push)
+# pragma warning(disable: 4702)  // unreachable code
+# pragma warning(disable: 4996)  // "deprecated" functions
+#endif
+
+namespace fmt
+{
+template <typename ArgFormatter>
+void format_arg(BasicFormatter<char, ArgFormatter> &f,
+                const char *&format_str, const std::tm &tm)
+{
+    if (*format_str == ':')
+        ++format_str;
+    const char *end = format_str;
+    while (*end && *end != '}')
+        ++end;
+    if (*end != '}')
+        FMT_THROW(FormatError("missing '}' in format string"));
+    internal::MemoryBuffer<char, internal::INLINE_BUFFER_SIZE> format;
+    format.append(format_str, end + 1);
+    format[format.size() - 1] = '\0';
+    Buffer<char> &buffer = f.writer().buffer();
+    std::size_t start = buffer.size();
+    for (;;)
+    {
+        std::size_t size = buffer.capacity() - start;
+        std::size_t count = std::strftime(&buffer[start], size, &format[0], &tm);
+        if (count != 0)
+        {
+            buffer.resize(start + count);
+            break;
+        }
+        if (size >= format.size() * 256)
+        {
+            // If the buffer is 256 times larger than the format string, assume
+            // that `strftime` gives an empty result. There doesn't seem to be a
+            // better way to distinguish the two cases:
+            // https://github.com/fmtlib/fmt/issues/367
+            break;
+        }
+        const std::size_t MIN_GROWTH = 10;
+        buffer.reserve(buffer.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
+    }
+    format_str = end + 1;
+}
+
+namespace internal
+{
+inline Null<> localtime_r(...)
+{
+    return Null<>();
+}
+inline Null<> localtime_s(...)
+{
+    return Null<>();
+}
+inline Null<> gmtime_r(...)
+{
+    return Null<>();
+}
+inline Null<> gmtime_s(...)
+{
+    return Null<>();
+}
+}
+
+// Thread-safe replacement for std::localtime
+inline std::tm localtime(std::time_t time)
+{
+    struct LocalTime
+    {
+        std::time_t time_;
+        std::tm tm_;
+
+        LocalTime(std::time_t t): time_(t) {}
+
+        bool run()
+        {
+            using namespace fmt::internal;
+            return handle(localtime_r(&time_, &tm_));
+        }
+
+        bool handle(std::tm *tm)
+        {
+            return tm != FMT_NULL;
+        }
+
+        bool handle(internal::Null<>)
+        {
+            using namespace fmt::internal;
+            return fallback(localtime_s(&tm_, &time_));
+        }
+
+        bool fallback(int res)
+        {
+            return res == 0;
+        }
+
+        bool fallback(internal::Null<>)
+        {
+            using namespace fmt::internal;
+            std::tm *tm = std::localtime(&time_);
+            if (tm) tm_ = *tm;
+            return tm != FMT_NULL;
+        }
+    };
+    LocalTime lt(time);
+    if (lt.run())
+        return lt.tm_;
+    // Too big time values may be unsupported.
+    FMT_THROW(fmt::FormatError("time_t value out of range"));
+    return std::tm();
+}
+
+// Thread-safe replacement for std::gmtime
+inline std::tm gmtime(std::time_t time)
+{
+    struct GMTime
+    {
+        std::time_t time_;
+        std::tm tm_;
+
+        GMTime(std::time_t t): time_(t) {}
+
+        bool run()
+        {
+            using namespace fmt::internal;
+            return handle(gmtime_r(&time_, &tm_));
+        }
+
+        bool handle(std::tm *tm)
+        {
+            return tm != FMT_NULL;
+        }
+
+        bool handle(internal::Null<>)
+        {
+            using namespace fmt::internal;
+            return fallback(gmtime_s(&tm_, &time_));
+        }
+
+        bool fallback(int res)
+        {
+            return res == 0;
+        }
+
+        bool fallback(internal::Null<>)
+        {
+            std::tm *tm = std::gmtime(&time_);
+            if (tm != FMT_NULL) tm_ = *tm;
+            return tm != FMT_NULL;
+        }
+    };
+    GMTime gt(time);
+    if (gt.run())
+        return gt.tm_;
+    // Too big time values may be unsupported.
+    FMT_THROW(fmt::FormatError("time_t value out of range"));
+    return std::tm();
+}
+} //namespace fmt
+
+#ifdef _MSC_VER
+# pragma warning(pop)
+#endif
+
+#endif  // FMT_TIME_H_
diff --git a/3d_party/spd_log/include/spdlog/fmt/fmt.h b/3d_party/spd_log/include/spdlog/fmt/fmt.h
new file mode 100644
index 000000000..92ca4e50f
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/fmt.h
@@ -0,0 +1,34 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+//
+// Include a bundled header-only copy of fmtlib or an external one.
+// By default spdlog include its own copy.
+//
+
+#if !defined(SPDLOG_FMT_EXTERNAL)
+
+#ifndef FMT_HEADER_ONLY
+#define FMT_HEADER_ONLY
+#endif
+#ifndef FMT_USE_WINDOWS_H
+#define FMT_USE_WINDOWS_H 0
+#endif
+#include "bundled/format.h"
+#if defined(SPDLOG_FMT_PRINTF)
+#include "bundled/printf.h"
+#endif
+
+#else //external fmtlib
+
+#include <fmt/format.h>
+#if defined(SPDLOG_FMT_PRINTF)
+#include <fmt/printf.h>
+#endif
+
+#endif
+
diff --git a/3d_party/spd_log/include/spdlog/fmt/ostr.h b/3d_party/spd_log/include/spdlog/fmt/ostr.h
new file mode 100644
index 000000000..5cdd5cd00
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/fmt/ostr.h
@@ -0,0 +1,17 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// include external or bundled copy of fmtlib's ostream support
+//
+#if !defined(SPDLOG_FMT_EXTERNAL)
+#include "fmt.h"
+#include "bundled/ostream.h"
+#else
+#include <fmt/ostream.h>
+#endif
+
+
diff --git a/3d_party/spd_log/include/spdlog/formatter.h b/3d_party/spd_log/include/spdlog/formatter.h
new file mode 100644
index 000000000..8bf0f43f8
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/formatter.h
@@ -0,0 +1,47 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "details/log_msg.h"
+
+#include <vector>
+#include <string>
+#include <memory>
+
+namespace spdlog
+{
+namespace details
+{
+class flag_formatter;
+}
+
+class formatter
+{
+public:
+    virtual ~formatter() {}
+    virtual void format(details::log_msg& msg) = 0;
+};
+
+class pattern_formatter SPDLOG_FINAL : public formatter
+{
+
+public:
+    explicit pattern_formatter(const std::string& pattern, pattern_time_type pattern_time = pattern_time_type::local);
+    pattern_formatter(const pattern_formatter&) = delete;
+    pattern_formatter& operator=(const pattern_formatter&) = delete;
+    void format(details::log_msg& msg) override;
+private:
+    const std::string _pattern;
+    const pattern_time_type _pattern_time;
+    std::vector<std::unique_ptr<details::flag_formatter>> _formatters;
+    std::tm get_time(details::log_msg& msg);
+    void handle_flag(char flag);
+    void compile_pattern(const std::string& pattern);
+};
+}
+
+#include "details/pattern_formatter_impl.h"
+
diff --git a/3d_party/spd_log/include/spdlog/logger.h b/3d_party/spd_log/include/spdlog/logger.h
new file mode 100644
index 000000000..742f667f1
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/logger.h
@@ -0,0 +1,110 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Thread safe logger (except for set_pattern(..), set_formatter(..) and set_error_handler())
+// Has name, log level, vector of std::shared sink pointers and formatter
+// Upon each log write the logger:
+// 1. Checks if its log level is enough to log the message
+// 2. Format the message using the formatter function
+// 3. Pass the formatted message to its sinks to performa the actual logging
+
+#include "sinks/base_sink.h"
+#include "common.h"
+
+#include <vector>
+#include <memory>
+#include <string>
+
+namespace spdlog
+{
+
+class logger
+{
+public:
+    logger(const std::string& logger_name, sink_ptr single_sink);
+    logger(const std::string& name, sinks_init_list);
+    template<class It>
+    logger(const std::string& name, const It& begin, const It& end);
+
+    virtual ~logger();
+    logger(const logger&) = delete;
+    logger& operator=(const logger&) = delete;
+
+
+    template <typename... Args> void log(level::level_enum lvl, const char* fmt, const Args&... args);
+    template <typename... Args> void log(level::level_enum lvl, const char* msg);
+    template <typename Arg1, typename... Args> void trace(const char* fmt, const Arg1&, const Args&... args);
+    template <typename Arg1, typename... Args> void debug(const char* fmt, const Arg1&, const Args&... args);
+    template <typename Arg1, typename... Args> void info(const char* fmt, const Arg1&, const Args&... args);
+    template <typename Arg1, typename... Args> void warn(const char* fmt, const Arg1&, const Args&... args);
+    template <typename Arg1, typename... Args> void error(const char* fmt, const Arg1&, const Args&... args);
+    template <typename Arg1, typename... Args> void critical(const char* fmt, const Arg1&, const Args&... args);
+
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    template <typename... Args> void log(level::level_enum lvl, const wchar_t* msg);
+    template <typename... Args> void log(level::level_enum lvl, const wchar_t* fmt, const Args&... args);
+    template <typename... Args> void trace(const wchar_t* fmt, const Args&... args);
+    template <typename... Args> void debug(const wchar_t* fmt, const Args&... args);
+    template <typename... Args> void info(const wchar_t* fmt, const Args&... args);
+    template <typename... Args> void warn(const wchar_t* fmt, const Args&... args);
+    template <typename... Args> void error(const wchar_t* fmt, const Args&... args);
+    template <typename... Args> void critical(const wchar_t* fmt, const Args&... args);
+#endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT
+
+    template <typename T> void log(level::level_enum lvl, const T&);
+    template <typename T> void trace(const T&);
+    template <typename T> void debug(const T&);
+    template <typename T> void info(const T&);
+    template <typename T> void warn(const T&);
+    template <typename T> void error(const T&);
+    template <typename T> void critical(const T&);
+
+    bool should_log(level::level_enum) const;
+    void set_level(level::level_enum);
+    level::level_enum level() const;
+    const std::string& name() const;
+    void set_pattern(const std::string&, pattern_time_type = pattern_time_type::local);
+    void set_formatter(formatter_ptr);
+
+    // automatically call flush() if message level >= log_level
+    void flush_on(level::level_enum log_level);
+
+    virtual void flush();
+
+    const std::vector<sink_ptr>& sinks() const;
+
+    // error handler
+    virtual void set_error_handler(log_err_handler);
+    virtual log_err_handler error_handler();
+
+protected:
+    virtual void _sink_it(details::log_msg&);
+    virtual void _set_pattern(const std::string&, pattern_time_type);
+    virtual void _set_formatter(formatter_ptr);
+
+    // default error handler: print the error to stderr with the max rate of 1 message/minute
+    virtual void _default_err_handler(const std::string &msg);
+
+    // return true if the given message level should trigger a flush
+    bool _should_flush_on(const details::log_msg&);
+
+    // increment the message count (only if defined(SPDLOG_ENABLE_MESSAGE_COUNTER))
+    void _incr_msg_counter(details::log_msg &msg);
+
+    const std::string _name;
+    std::vector<sink_ptr> _sinks;
+    formatter_ptr _formatter;
+    spdlog::level_t _level;
+    spdlog::level_t _flush_level;
+    log_err_handler _err_handler;
+    std::atomic<time_t> _last_err_time;
+    std::atomic<size_t> _msg_counter;
+};
+}
+
+#include "details/logger_impl.h"
diff --git a/3d_party/spd_log/include/spdlog/sinks/android_sink.h b/3d_party/spd_log/include/spdlog/sinks/android_sink.h
new file mode 100644
index 000000000..e37667558
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/android_sink.h
@@ -0,0 +1,91 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#if defined(__ANDROID__)
+
+#include "sink.h"
+#include "../details/os.h"
+
+#include <mutex>
+#include <string>
+#include <android/log.h>
+#include <thread>
+#include <chrono>
+
+#if !defined(SPDLOG_ANDROID_RETRIES)
+#define SPDLOG_ANDROID_RETRIES 2
+#endif
+
+namespace spdlog
+{
+namespace sinks
+{
+
+/*
+* Android sink (logging using __android_log_write)
+* __android_log_write is thread-safe. No lock is needed.
+*/
+class android_sink : public sink
+{
+public:
+    explicit android_sink(const std::string& tag = "spdlog", bool use_raw_msg = false): _tag(tag), _use_raw_msg(use_raw_msg) {}
+
+    void log(const details::log_msg& msg) override
+    {
+        const android_LogPriority priority = convert_to_android(msg.level);
+        const char *msg_output = (_use_raw_msg ? msg.raw.c_str() : msg.formatted.c_str());
+
+        // See system/core/liblog/logger_write.c for explanation of return value
+        int ret = __android_log_write(priority, _tag.c_str(), msg_output);
+        int retry_count = 0;
+        while ((ret == -11/*EAGAIN*/) && (retry_count < SPDLOG_ANDROID_RETRIES))
+        {
+            details::os::sleep_for_millis(5);
+            ret = __android_log_write(priority, _tag.c_str(), msg_output);
+            retry_count++;
+        }
+
+        if (ret < 0)
+        {
+            throw spdlog_ex("__android_log_write() failed", ret);
+        }
+    }
+
+    void flush() override
+    {
+    }
+
+private:
+    static android_LogPriority convert_to_android(spdlog::level::level_enum level)
+    {
+        switch(level)
+        {
+        case spdlog::level::trace:
+            return ANDROID_LOG_VERBOSE;
+        case spdlog::level::debug:
+            return ANDROID_LOG_DEBUG;
+        case spdlog::level::info:
+            return ANDROID_LOG_INFO;
+        case spdlog::level::warn:
+            return ANDROID_LOG_WARN;
+        case spdlog::level::err:
+            return ANDROID_LOG_ERROR;
+        case spdlog::level::critical:
+            return ANDROID_LOG_FATAL;
+        default:
+            return ANDROID_LOG_DEFAULT;
+        }
+    }
+
+    std::string _tag;
+    bool _use_raw_msg;
+};
+
+}
+}
+
+#endif
diff --git a/3d_party/spd_log/include/spdlog/sinks/ansicolor_sink.h b/3d_party/spd_log/include/spdlog/sinks/ansicolor_sink.h
new file mode 100644
index 000000000..290973133
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/ansicolor_sink.h
@@ -0,0 +1,133 @@
+//
+// Copyright(c) 2017 spdlog authors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "base_sink.h"
+#include "../common.h"
+#include "../details/os.h"
+
+#include <string>
+#include <map>
+
+namespace spdlog
+{
+namespace sinks
+{
+
+/**
+ * This sink prefixes the output with an ANSI escape sequence color code depending on the severity
+ * of the message.
+ * If no color terminal detected, omit the escape codes.
+ */
+template <class Mutex>
+class ansicolor_sink: public base_sink<Mutex>
+{
+public:
+    ansicolor_sink(FILE* file): target_file_(file)
+    {
+        should_do_colors_ = details::os::in_terminal(file) && details::os::is_color_terminal();
+        colors_[level::trace] = cyan;
+        colors_[level::debug] = cyan;
+        colors_[level::info] = reset;
+        colors_[level::warn] = yellow + bold;
+        colors_[level::err] = red + bold;
+        colors_[level::critical] = bold + on_red;
+        colors_[level::off] = reset;
+    }
+    virtual ~ansicolor_sink()
+    {
+        _flush();
+    }
+
+    void set_color(level::level_enum color_level, const std::string& color)
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::_mutex);
+        colors_[color_level] = color;
+    }
+
+    /// Formatting codes
+    const std::string reset = "\033[00m";
+    const std::string bold = "\033[1m";
+    const std::string dark = "\033[2m";
+    const std::string underline = "\033[4m";
+    const std::string blink = "\033[5m";
+    const std::string reverse = "\033[7m";
+    const std::string concealed = "\033[8m";
+
+    // Foreground colors
+    const std::string grey = "\033[30m";
+    const std::string red = "\033[31m";
+    const std::string green = "\033[32m";
+    const std::string yellow = "\033[33m";
+    const std::string blue = "\033[34m";
+    const std::string magenta = "\033[35m";
+    const std::string cyan = "\033[36m";
+    const std::string white = "\033[37m";
+
+    /// Background colors
+    const std::string on_grey = "\033[40m";
+    const std::string on_red = "\033[41m";
+    const std::string on_green = "\033[42m";
+    const std::string on_yellow = "\033[43m";
+    const std::string on_blue = "\033[44m";
+    const std::string on_magenta = "\033[45m";
+    const std::string on_cyan = "\033[46m";
+    const std::string on_white = "\033[47m";
+
+protected:
+    virtual void _sink_it(const details::log_msg& msg) override
+    {
+        // Wrap the originally formatted message in color codes.
+        // If color is not supported in the terminal, log as is instead.
+        if (should_do_colors_)
+        {
+            const std::string& prefix = colors_[msg.level];
+            fwrite(prefix.data(), sizeof(char), prefix.size(), target_file_);
+            fwrite(msg.formatted.data(), sizeof(char), msg.formatted.size(), target_file_);
+            fwrite(reset.data(), sizeof(char), reset.size(), target_file_);
+        }
+        else
+        {
+            fwrite(msg.formatted.data(), sizeof(char), msg.formatted.size(), target_file_);
+        }
+        _flush();
+    }
+
+    void _flush() override
+    {
+        fflush(target_file_);
+    }
+    FILE* target_file_;
+    bool should_do_colors_;
+    std::map<level::level_enum, std::string> colors_;
+};
+
+
+template<class Mutex>
+class ansicolor_stdout_sink: public ansicolor_sink<Mutex>
+{
+public:
+    ansicolor_stdout_sink(): ansicolor_sink<Mutex>(stdout)
+    {}
+};
+
+template<class Mutex>
+class ansicolor_stderr_sink: public ansicolor_sink<Mutex>
+{
+public:
+    ansicolor_stderr_sink(): ansicolor_sink<Mutex>(stderr)
+    {}
+};
+
+typedef ansicolor_stdout_sink<std::mutex> ansicolor_stdout_sink_mt;
+typedef ansicolor_stdout_sink<details::null_mutex> ansicolor_stdout_sink_st;
+
+typedef ansicolor_stderr_sink<std::mutex> ansicolor_stderr_sink_mt;
+typedef ansicolor_stderr_sink<details::null_mutex> ansicolor_stderr_sink_st;
+
+} // namespace sinks
+} // namespace spdlog
+
diff --git a/3d_party/spd_log/include/spdlog/sinks/base_sink.h b/3d_party/spd_log/include/spdlog/sinks/base_sink.h
new file mode 100644
index 000000000..23c856530
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/base_sink.h
@@ -0,0 +1,51 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// base sink templated over a mutex (either dummy or real)
+// concrete implementation should only override the _sink_it method.
+// all locking is taken care of here so no locking needed by the implementers..
+//
+
+#include "sink.h"
+#include "../formatter.h"
+#include "../common.h"
+#include "../details/log_msg.h"
+
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+template<class Mutex>
+class base_sink:public sink
+{
+public:
+    base_sink():_mutex() {}
+    virtual ~base_sink() = default;
+
+    base_sink(const base_sink&) = delete;
+    base_sink& operator=(const base_sink&) = delete;
+
+    void log(const details::log_msg& msg) SPDLOG_FINAL override
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _sink_it(msg);
+    }
+    void flush() SPDLOG_FINAL override
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _flush();
+    }
+
+protected:
+    virtual void _sink_it(const details::log_msg& msg) = 0;
+    virtual void _flush() = 0;
+    Mutex _mutex;
+};
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/sinks/dist_sink.h b/3d_party/spd_log/include/spdlog/sinks/dist_sink.h
new file mode 100644
index 000000000..537efe1d1
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/dist_sink.h
@@ -0,0 +1,72 @@
+//
+// Copyright (c) 2015 David Schury, Gabi Melman
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "../details/log_msg.h"
+#include "../details/null_mutex.h"
+#include "base_sink.h"
+#include "sink.h"
+
+#include <algorithm>
+#include <mutex>
+#include <memory>
+#include <vector>
+
+// Distribution sink (mux). Stores a vector of sinks which get called when log is called
+
+namespace spdlog
+{
+namespace sinks
+{
+template<class Mutex>
+class dist_sink: public base_sink<Mutex>
+{
+public:
+    explicit dist_sink() :_sinks() {}
+    dist_sink(const dist_sink&) = delete;
+    dist_sink& operator=(const dist_sink&) = delete;
+    virtual ~dist_sink() = default;
+
+protected:
+    std::vector<std::shared_ptr<sink>> _sinks;
+
+    void _sink_it(const details::log_msg& msg) override
+    {
+        for (auto &sink : _sinks)
+        {
+            if( sink->should_log( msg.level))
+            {
+                sink->log(msg);
+            }
+        }
+    }
+
+    void _flush() override
+    {
+        for (auto &sink : _sinks)
+            sink->flush();
+    }
+
+public:
+
+
+    void add_sink(std::shared_ptr<sink> sink)
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::_mutex);
+        _sinks.push_back(sink);
+    }
+
+    void remove_sink(std::shared_ptr<sink> sink)
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::_mutex);
+        _sinks.erase(std::remove(_sinks.begin(), _sinks.end(), sink), _sinks.end());
+    }
+};
+
+typedef dist_sink<std::mutex> dist_sink_mt;
+typedef dist_sink<details::null_mutex> dist_sink_st;
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/sinks/file_sinks.h b/3d_party/spd_log/include/spdlog/sinks/file_sinks.h
new file mode 100644
index 000000000..e78561722
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/file_sinks.h
@@ -0,0 +1,253 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "base_sink.h"
+#include "../details/null_mutex.h"
+#include "../details/file_helper.h"
+#include "../fmt/fmt.h"
+
+#include <algorithm>
+#include <chrono>
+#include <cstdio>
+#include <ctime>
+#include <mutex>
+#include <string>
+#include <cerrno>
+
+namespace spdlog
+{
+namespace sinks
+{
+/*
+ * Trivial file sink with single file as target
+ */
+template<class Mutex>
+class simple_file_sink SPDLOG_FINAL : public base_sink < Mutex >
+{
+public:
+    explicit simple_file_sink(const filename_t &filename, bool truncate = false):_force_flush(false)
+    {
+        _file_helper.open(filename, truncate);
+    }
+
+    void set_force_flush(bool force_flush)
+    {
+        _force_flush = force_flush;
+    }
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        _file_helper.write(msg);
+        if(_force_flush)
+            _file_helper.flush();
+    }
+    void _flush() override
+    {
+        _file_helper.flush();
+    }
+private:
+    details::file_helper _file_helper;
+    bool _force_flush;
+};
+
+typedef simple_file_sink<std::mutex> simple_file_sink_mt;
+typedef simple_file_sink<details::null_mutex> simple_file_sink_st;
+
+/*
+ * Rotating file sink based on size
+ */
+template<class Mutex>
+class rotating_file_sink SPDLOG_FINAL : public base_sink < Mutex >
+{
+public:
+    rotating_file_sink(const filename_t &base_filename,
+                       std::size_t max_size, std::size_t max_files) :
+        _base_filename(base_filename),
+        _max_size(max_size),
+        _max_files(max_files),
+        _current_size(0),
+        _file_helper()
+    {
+        _file_helper.open(calc_filename(_base_filename, 0));
+        _current_size = _file_helper.size(); //expensive. called only once
+    }
+
+    // calc filename according to index and file extension if exists.
+    // e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.3.txt".
+    static filename_t calc_filename(const filename_t& filename, std::size_t index)
+    {
+        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+        if (index)
+        {
+            filename_t basename, ext;
+            std::tie(basename, ext) = details::file_helper::split_by_extenstion(filename);
+            w.write(SPDLOG_FILENAME_T("{}.{}{}"), basename, index, ext);
+        }
+        else
+        {
+            w.write(SPDLOG_FILENAME_T("{}"), filename);
+        }
+        return w.str();
+    }
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        _current_size += msg.formatted.size();
+        if (_current_size > _max_size)
+        {
+            _rotate();
+            _current_size = msg.formatted.size();
+        }
+        _file_helper.write(msg);
+    }
+
+    void _flush() override
+    {
+        _file_helper.flush();
+    }
+
+
+private:
+    // Rotate files:
+    // log.txt -> log.1.txt
+    // log.1.txt -> log.2.txt
+    // log.2.txt -> log.3.txt
+    // log.3.txt -> delete
+    void _rotate()
+    {
+        using details::os::filename_to_str;
+        _file_helper.close();
+        for (auto i = _max_files; i > 0; --i)
+        {
+            filename_t src = calc_filename(_base_filename, i - 1);
+            filename_t target = calc_filename(_base_filename, i);
+
+            if (details::file_helper::file_exists(target))
+            {
+                if (details::os::remove(target) != 0)
+                {
+                    throw spdlog_ex("rotating_file_sink: failed removing " + filename_to_str(target), errno);
+                }
+            }
+            if (details::file_helper::file_exists(src) && details::os::rename(src, target))
+            {
+                throw spdlog_ex("rotating_file_sink: failed renaming " + filename_to_str(src) + " to " + filename_to_str(target), errno);
+            }
+        }
+        _file_helper.reopen(true);
+    }
+    filename_t _base_filename;
+    std::size_t _max_size;
+    std::size_t _max_files;
+    std::size_t _current_size;
+    details::file_helper _file_helper;
+};
+
+typedef rotating_file_sink<std::mutex> rotating_file_sink_mt;
+typedef rotating_file_sink<details::null_mutex>rotating_file_sink_st;
+
+/*
+ * Default generator of daily log file names.
+ */
+struct default_daily_file_name_calculator
+{
+    // Create filename for the form filename.YYYY-MM-DD_hh-mm.ext
+    static filename_t calc_filename(const filename_t& filename)
+    {
+        std::tm tm = spdlog::details::os::localtime();
+        filename_t basename, ext;
+        std::tie(basename, ext) = details::file_helper::split_by_extenstion(filename);
+        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}_{:02d}-{:02d}{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, ext);
+        return w.str();
+    }
+};
+
+/*
+ * Generator of daily log file names in format basename.YYYY-MM-DD.ext
+ */
+struct dateonly_daily_file_name_calculator
+{
+    // Create filename for the form basename.YYYY-MM-DD
+    static filename_t calc_filename(const filename_t& filename)
+    {
+        std::tm tm = spdlog::details::os::localtime();
+        filename_t basename, ext;
+        std::tie(basename, ext) = details::file_helper::split_by_extenstion(filename);
+        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, ext);
+        return w.str();
+    }
+};
+
+/*
+ * Rotating file sink based on date. rotates at midnight
+ */
+template<class Mutex, class FileNameCalc = default_daily_file_name_calculator>
+class daily_file_sink SPDLOG_FINAL :public base_sink < Mutex >
+{
+public:
+    //create daily file sink which rotates on given time
+    daily_file_sink(
+        const filename_t& base_filename,
+        int rotation_hour,
+        int rotation_minute) : _base_filename(base_filename),
+        _rotation_h(rotation_hour),
+        _rotation_m(rotation_minute)
+    {
+        if (rotation_hour < 0 || rotation_hour > 23 || rotation_minute < 0 || rotation_minute > 59)
+            throw spdlog_ex("daily_file_sink: Invalid rotation time in ctor");
+        _rotation_tp = _next_rotation_tp();
+        _file_helper.open(FileNameCalc::calc_filename(_base_filename));
+    }
+
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        if (std::chrono::system_clock::now() >= _rotation_tp)
+        {
+            _file_helper.open(FileNameCalc::calc_filename(_base_filename));
+            _rotation_tp = _next_rotation_tp();
+        }
+        _file_helper.write(msg);
+    }
+
+    void _flush() override
+    {
+        _file_helper.flush();
+    }
+
+private:
+    std::chrono::system_clock::time_point _next_rotation_tp()
+    {
+        auto now = std::chrono::system_clock::now();
+        time_t tnow = std::chrono::system_clock::to_time_t(now);
+        tm date = spdlog::details::os::localtime(tnow);
+        date.tm_hour = _rotation_h;
+        date.tm_min = _rotation_m;
+        date.tm_sec = 0;
+        auto rotation_time = std::chrono::system_clock::from_time_t(std::mktime(&date));
+        if (rotation_time > now)
+            return rotation_time;
+        else
+            return std::chrono::system_clock::time_point(rotation_time + std::chrono::hours(24));
+    }
+
+    filename_t _base_filename;
+    int _rotation_h;
+    int _rotation_m;
+    std::chrono::system_clock::time_point _rotation_tp;
+    details::file_helper _file_helper;
+};
+
+typedef daily_file_sink<std::mutex> daily_file_sink_mt;
+typedef daily_file_sink<details::null_mutex> daily_file_sink_st;
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/sinks/msvc_sink.h b/3d_party/spd_log/include/spdlog/sinks/msvc_sink.h
new file mode 100644
index 000000000..22b52c8fe
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/msvc_sink.h
@@ -0,0 +1,51 @@
+//
+// Copyright(c) 2016 Alexander Dalshov.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#if defined(_WIN32)
+
+#include "base_sink.h"
+#include "../details/null_mutex.h"
+
+#include <winbase.h>
+
+#include <mutex>
+#include <string>
+
+namespace spdlog
+{
+namespace sinks
+{
+/*
+* MSVC sink (logging using OutputDebugStringA)
+*/
+template<class Mutex>
+class msvc_sink : public base_sink < Mutex >
+{
+public:
+    explicit msvc_sink()
+    {
+    }
+
+
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        OutputDebugStringA(msg.formatted.c_str());
+    }
+
+    void _flush() override
+    {}
+};
+
+typedef msvc_sink<std::mutex> msvc_sink_mt;
+typedef msvc_sink<details::null_mutex> msvc_sink_st;
+
+}
+}
+
+#endif
diff --git a/3d_party/spd_log/include/spdlog/sinks/null_sink.h b/3d_party/spd_log/include/spdlog/sinks/null_sink.h
new file mode 100644
index 000000000..7605ac68c
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/null_sink.h
@@ -0,0 +1,34 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "base_sink.h"
+#include "../details/null_mutex.h"
+
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+
+template <class Mutex>
+class null_sink : public base_sink < Mutex >
+{
+protected:
+    void _sink_it(const details::log_msg&) override
+    {}
+
+    void _flush() override
+    {}
+
+};
+typedef null_sink<details::null_mutex> null_sink_st;
+typedef null_sink<details::null_mutex> null_sink_mt;
+
+}
+}
+
diff --git a/3d_party/spd_log/include/spdlog/sinks/ostream_sink.h b/3d_party/spd_log/include/spdlog/sinks/ostream_sink.h
new file mode 100644
index 000000000..1e5b261c0
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/ostream_sink.h
@@ -0,0 +1,47 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "../details/null_mutex.h"
+#include "base_sink.h"
+
+#include <ostream>
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+template<class Mutex>
+class ostream_sink: public base_sink<Mutex>
+{
+public:
+    explicit ostream_sink(std::ostream& os, bool force_flush=false) :_ostream(os), _force_flush(force_flush) {}
+    ostream_sink(const ostream_sink&) = delete;
+    ostream_sink& operator=(const ostream_sink&) = delete;
+    virtual ~ostream_sink() = default;
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        _ostream.write(msg.formatted.data(), msg.formatted.size());
+        if (_force_flush)
+            _ostream.flush();
+    }
+
+    void _flush() override
+    {
+        _ostream.flush();
+    }
+
+    std::ostream& _ostream;
+    bool _force_flush;
+};
+
+typedef ostream_sink<std::mutex> ostream_sink_mt;
+typedef ostream_sink<details::null_mutex> ostream_sink_st;
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/sinks/sink.h b/3d_party/spd_log/include/spdlog/sinks/sink.h
new file mode 100644
index 000000000..af61b54c6
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/sink.h
@@ -0,0 +1,53 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+
+#pragma once
+
+#include "../details/log_msg.h"
+
+namespace spdlog
+{
+namespace sinks
+{
+class sink
+{
+public:
+    sink()
+    {
+        _level = level::trace;
+    }
+
+    virtual ~sink() {}
+    virtual void log(const details::log_msg& msg) = 0;
+    virtual void flush() = 0;
+
+    bool should_log(level::level_enum msg_level) const;
+    void set_level(level::level_enum log_level);
+    level::level_enum level() const;
+
+private:
+    level_t _level;
+
+};
+
+inline bool sink::should_log(level::level_enum msg_level) const
+{
+    return msg_level >= _level.load(std::memory_order_relaxed);
+}
+
+inline void sink::set_level(level::level_enum log_level)
+{
+    _level.store(log_level);
+}
+
+inline level::level_enum sink::level() const
+{
+    return static_cast<spdlog::level::level_enum>(_level.load(std::memory_order_relaxed));
+}
+
+}
+}
+
diff --git a/3d_party/spd_log/include/spdlog/sinks/stdout_sinks.h b/3d_party/spd_log/include/spdlog/sinks/stdout_sinks.h
new file mode 100644
index 000000000..dfbfccd51
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/stdout_sinks.h
@@ -0,0 +1,77 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "../details/null_mutex.h"
+#include "base_sink.h"
+
+#include <cstdio>
+#include <memory>
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+
+template <class Mutex>
+class stdout_sink SPDLOG_FINAL : public base_sink<Mutex>
+{
+    using MyType = stdout_sink<Mutex>;
+public:
+    stdout_sink()
+    {}
+    static std::shared_ptr<MyType> instance()
+    {
+        static std::shared_ptr<MyType> instance = std::make_shared<MyType>();
+        return instance;
+    }
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        fwrite(msg.formatted.data(), sizeof(char), msg.formatted.size(), stdout);
+        _flush();
+    }
+
+    void _flush() override
+    {
+        fflush(stdout);
+    }
+};
+
+typedef stdout_sink<details::null_mutex> stdout_sink_st;
+typedef stdout_sink<std::mutex> stdout_sink_mt;
+
+
+template <class Mutex>
+class stderr_sink SPDLOG_FINAL : public base_sink<Mutex>
+{
+    using MyType = stderr_sink<Mutex>;
+public:
+    stderr_sink()
+    {}
+    static std::shared_ptr<MyType> instance()
+    {
+        static std::shared_ptr<MyType> instance = std::make_shared<MyType>();
+        return instance;
+    }
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        fwrite(msg.formatted.data(), sizeof(char), msg.formatted.size(), stderr);
+        _flush();
+    }
+
+    void _flush() override
+    {
+        fflush(stderr);
+    }
+};
+
+typedef stderr_sink<std::mutex> stderr_sink_mt;
+typedef stderr_sink<details::null_mutex> stderr_sink_st;
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/sinks/syslog_sink.h b/3d_party/spd_log/include/spdlog/sinks/syslog_sink.h
new file mode 100644
index 000000000..c4a726a8f
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/syslog_sink.h
@@ -0,0 +1,81 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "../common.h"
+
+#ifdef SPDLOG_ENABLE_SYSLOG
+
+#include "sink.h"
+#include "../details/log_msg.h"
+
+#include <array>
+#include <string>
+#include <syslog.h>
+
+
+namespace spdlog
+{
+namespace sinks
+{
+/**
+ * Sink that write to syslog using the `syscall()` library call.
+ *
+ * Locking is not needed, as `syslog()` itself is thread-safe.
+ */
+class syslog_sink : public sink
+{
+public:
+    //
+    syslog_sink(const std::string& ident = "", int syslog_option=0, int syslog_facility=LOG_USER):
+        _ident(ident)
+    {
+        _priorities[static_cast<int>(level::trace)] = LOG_DEBUG;
+        _priorities[static_cast<int>(level::debug)] = LOG_DEBUG;
+        _priorities[static_cast<int>(level::info)] = LOG_INFO;
+        _priorities[static_cast<int>(level::warn)] = LOG_WARNING;
+        _priorities[static_cast<int>(level::err)] = LOG_ERR;
+        _priorities[static_cast<int>(level::critical)] = LOG_CRIT;
+        _priorities[static_cast<int>(level::off)] = LOG_INFO;
+
+        //set ident to be program name if empty
+        ::openlog(_ident.empty()? nullptr:_ident.c_str(), syslog_option, syslog_facility);
+    }
+    ~syslog_sink()
+    {
+        ::closelog();
+    }
+
+    syslog_sink(const syslog_sink&) = delete;
+    syslog_sink& operator=(const syslog_sink&) = delete;
+
+    void log(const details::log_msg &msg) override
+    {
+        ::syslog(syslog_prio_from_level(msg), "%s", msg.raw.str().c_str());
+    }
+
+    void flush() override
+    {
+    }
+
+
+private:
+    std::array<int, 7> _priorities;
+    //must store the ident because the man says openlog might use the pointer as is and not a string copy
+    const std::string _ident;
+
+    //
+    // Simply maps spdlog's log level to syslog priority level.
+    //
+    int syslog_prio_from_level(const details::log_msg &msg) const
+    {
+        return _priorities[static_cast<int>(msg.level)];
+    }
+};
+}
+}
+
+#endif
diff --git a/3d_party/spd_log/include/spdlog/sinks/wincolor_sink.h b/3d_party/spd_log/include/spdlog/sinks/wincolor_sink.h
new file mode 100644
index 000000000..8ee3d894c
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/wincolor_sink.h
@@ -0,0 +1,121 @@
+//
+// Copyright(c) 2016 spdlog
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "base_sink.h"
+#include "../details/null_mutex.h"
+#include "../common.h"
+
+#include <mutex>
+#include <string>
+#include <map>
+#include <wincon.h>
+
+namespace spdlog
+{
+namespace sinks
+{
+/*
+ * Windows color console sink. Uses WriteConsoleA to write to the console with colors
+ */
+template<class Mutex>
+class wincolor_sink: public  base_sink<Mutex>
+{
+public:
+    const WORD BOLD = FOREGROUND_INTENSITY;
+    const WORD RED = FOREGROUND_RED;
+    const WORD CYAN = FOREGROUND_GREEN | FOREGROUND_BLUE;
+    const WORD WHITE = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
+    const WORD YELLOW = FOREGROUND_RED | FOREGROUND_GREEN;
+
+    wincolor_sink(HANDLE std_handle): out_handle_(std_handle)
+    {
+        colors_[level::trace] = CYAN;
+        colors_[level::debug] = CYAN;
+        colors_[level::info] = WHITE | BOLD;
+        colors_[level::warn] = YELLOW | BOLD;
+        colors_[level::err] = RED | BOLD; // red bold
+        colors_[level::critical] = BACKGROUND_RED | WHITE | BOLD; // white bold on red background
+        colors_[level::off] = 0;
+    }
+
+    virtual ~wincolor_sink()
+    {
+        this->flush();
+    }
+
+    wincolor_sink(const wincolor_sink& other) = delete;
+    wincolor_sink& operator=(const wincolor_sink& other) = delete;
+
+protected:
+    virtual void _sink_it(const details::log_msg& msg) override
+    {
+        auto color = colors_[msg.level];
+        auto orig_attribs = set_console_attribs(color);
+        WriteConsoleA(out_handle_, msg.formatted.data(), static_cast<DWORD>(msg.formatted.size()), nullptr, nullptr);
+        SetConsoleTextAttribute(out_handle_, orig_attribs); //reset to orig colors
+    }
+
+    virtual void _flush() override
+    {
+        // windows console always flushed?
+    }
+
+    // change the  color for the given level
+    void set_color(level::level_enum level, WORD color)
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::_mutex);
+        colors_[level] = color;
+    }
+
+private:
+    HANDLE out_handle_;
+    std::map<level::level_enum, WORD> colors_;
+
+    // set color and return the orig console attributes (for resetting later)
+    WORD set_console_attribs(WORD attribs)
+    {
+        CONSOLE_SCREEN_BUFFER_INFO orig_buffer_info;
+        GetConsoleScreenBufferInfo(out_handle_, &orig_buffer_info);
+        WORD back_color = orig_buffer_info.wAttributes;
+        // retrieve the current background color
+        back_color &= static_cast<WORD>(~(FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY));
+        // keep the background color unchanged
+        SetConsoleTextAttribute(out_handle_, attribs | back_color);
+        return  orig_buffer_info.wAttributes; //return orig attribs
+    }
+};
+
+//
+// windows color console to stdout
+//
+template<class Mutex>
+class wincolor_stdout_sink: public wincolor_sink<Mutex>
+{
+public:
+    wincolor_stdout_sink() : wincolor_sink<Mutex>(GetStdHandle(STD_OUTPUT_HANDLE))
+    {}
+};
+
+typedef wincolor_stdout_sink<std::mutex> wincolor_stdout_sink_mt;
+typedef wincolor_stdout_sink<details::null_mutex> wincolor_stdout_sink_st;
+
+//
+// windows color console to stderr
+//
+template<class Mutex>
+class wincolor_stderr_sink: public wincolor_sink<Mutex>
+{
+public:
+    wincolor_stderr_sink() : wincolor_sink<Mutex>(GetStdHandle(STD_ERROR_HANDLE))
+    {}
+};
+
+typedef wincolor_stderr_sink<std::mutex> wincolor_stderr_sink_mt;
+typedef wincolor_stderr_sink<details::null_mutex> wincolor_stderr_sink_st;
+
+}
+}
diff --git a/3d_party/spd_log/include/spdlog/sinks/windebug_sink.h b/3d_party/spd_log/include/spdlog/sinks/windebug_sink.h
new file mode 100644
index 000000000..c22e9522e
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/sinks/windebug_sink.h
@@ -0,0 +1,29 @@
+//
+// Copyright(c) 2017 Alexander Dalshov.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#if defined(_WIN32)
+
+#include "msvc_sink.h"
+
+namespace spdlog
+{
+namespace sinks
+{
+
+/*
+* Windows debug sink (logging using OutputDebugStringA, synonym for msvc_sink)
+*/
+template<class Mutex>
+using windebug_sink = msvc_sink<Mutex>;
+
+typedef msvc_sink_mt windebug_sink_mt;
+typedef msvc_sink_st windebug_sink_st;
+
+}
+}
+
+#endif
diff --git a/3d_party/spd_log/include/spdlog/spdlog.h b/3d_party/spd_log/include/spdlog/spdlog.h
new file mode 100644
index 000000000..ff79ef6e2
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/spdlog.h
@@ -0,0 +1,192 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+// spdlog main header file.
+// see example.cpp for usage example
+
+#pragma once
+
+#define SPDLOG_VERSION "0.16.3"
+
+#include "tweakme.h"
+#include "common.h"
+#include "logger.h"
+
+#include <memory>
+#include <functional>
+#include <chrono>
+#include <string>
+
+namespace spdlog
+{
+
+//
+// Return an existing logger or nullptr if a logger with such name doesn't exist.
+// example: spdlog::get("my_logger")->info("hello {}", "world");
+//
+std::shared_ptr<logger> get(const std::string& name);
+
+
+//
+// Set global formatting
+// example: spdlog::set_pattern("%Y-%m-%d %H:%M:%S.%e %l : %v");
+//
+void set_pattern(const std::string& format_string);
+void set_formatter(formatter_ptr f);
+
+//
+// Set global logging level
+//
+void set_level(level::level_enum log_level);
+
+//
+// Set global flush level
+//
+void flush_on(level::level_enum log_level);
+
+//
+// Set global error handler
+//
+void set_error_handler(log_err_handler);
+
+//
+// Turn on async mode (off by default) and set the queue size for each async_logger.
+// effective only for loggers created after this call.
+// queue_size: size of queue (must be power of 2):
+//    Each logger will pre-allocate a dedicated queue with queue_size entries upon construction.
+//
+// async_overflow_policy (optional, block_retry by default):
+//    async_overflow_policy::block_retry - if queue is full, block until queue has room for the new log entry.
+//    async_overflow_policy::discard_log_msg - never block and discard any new messages when queue  overflows.
+//
+// worker_warmup_cb (optional):
+//     callback function that will be called in worker thread upon start (can be used to init stuff like thread affinity)
+//
+// worker_teardown_cb (optional):
+//     callback function that will be called in worker thread upon exit
+//
+void set_async_mode(size_t queue_size, const async_overflow_policy overflow_policy = async_overflow_policy::block_retry, const std::function<void()>& worker_warmup_cb = nullptr, const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(), const std::function<void()>& worker_teardown_cb = nullptr);
+
+// Turn off async mode
+void set_sync_mode();
+
+
+//
+// Create and register multi/single threaded basic file logger.
+// Basic logger simply writes to given file without any limitations or rotations.
+//
+std::shared_ptr<logger> basic_logger_mt(const std::string& logger_name, const filename_t& filename, bool truncate = false);
+std::shared_ptr<logger> basic_logger_st(const std::string& logger_name, const filename_t& filename, bool truncate = false);
+
+//
+// Create and register multi/single threaded rotating file logger
+//
+std::shared_ptr<logger> rotating_logger_mt(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files);
+std::shared_ptr<logger> rotating_logger_st(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files);
+
+//
+// Create file logger which creates new file on the given time (default in  midnight):
+//
+std::shared_ptr<logger> daily_logger_mt(const std::string& logger_name, const filename_t& filename, int hour=0, int minute=0);
+std::shared_ptr<logger> daily_logger_st(const std::string& logger_name, const filename_t& filename, int hour=0, int minute=0);
+
+//
+// Create and register stdout/stderr loggers
+//
+std::shared_ptr<logger> stdout_logger_mt(const std::string& logger_name);
+std::shared_ptr<logger> stdout_logger_st(const std::string& logger_name);
+std::shared_ptr<logger> stderr_logger_mt(const std::string& logger_name);
+std::shared_ptr<logger> stderr_logger_st(const std::string& logger_name);
+//
+// Create and register colored stdout/stderr loggers
+//
+std::shared_ptr<logger> stdout_color_mt(const std::string& logger_name);
+std::shared_ptr<logger> stdout_color_st(const std::string& logger_name);
+std::shared_ptr<logger> stderr_color_mt(const std::string& logger_name);
+std::shared_ptr<logger> stderr_color_st(const std::string& logger_name);
+
+
+//
+// Create and register a syslog logger
+//
+#ifdef SPDLOG_ENABLE_SYSLOG
+std::shared_ptr<logger> syslog_logger(const std::string& logger_name, const std::string& ident = "", int syslog_option = 0, int syslog_facilty = (1<<3));
+#endif
+
+#if defined(__ANDROID__)
+std::shared_ptr<logger> android_logger(const std::string& logger_name, const std::string& tag = "spdlog");
+#endif
+
+// Create and register a logger with a single sink
+std::shared_ptr<logger> create(const std::string& logger_name, const sink_ptr& sink);
+
+// Create and register a logger with multiple sinks
+std::shared_ptr<logger> create(const std::string& logger_name, sinks_init_list sinks);
+template<class It>
+std::shared_ptr<logger> create(const std::string& logger_name, const It& sinks_begin, const It& sinks_end);
+
+
+// Create and register a logger with templated sink type
+// Example:
+// spdlog::create<daily_file_sink_st>("mylog", "dailylog_filename");
+template <typename Sink, typename... Args>
+std::shared_ptr<spdlog::logger> create(const std::string& logger_name, Args...);
+
+// Create and register an async logger with a single sink
+std::shared_ptr<logger> create_async(const std::string& logger_name, const sink_ptr& sink, size_t queue_size, const async_overflow_policy overflow_policy = async_overflow_policy::block_retry, const std::function<void()>& worker_warmup_cb = nullptr, const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(), const std::function<void()>& worker_teardown_cb = nullptr);
+
+// Create and register an async logger with multiple sinks
+std::shared_ptr<logger> create_async(const std::string& logger_name, sinks_init_list sinks, size_t queue_size, const async_overflow_policy overflow_policy = async_overflow_policy::block_retry, const std::function<void()>& worker_warmup_cb = nullptr, const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(), const std::function<void()>& worker_teardown_cb = nullptr);
+template<class It>
+std::shared_ptr<logger> create_async(const std::string& logger_name, const It& sinks_begin, const It& sinks_end, size_t queue_size, const async_overflow_policy overflow_policy = async_overflow_policy::block_retry, const std::function<void()>& worker_warmup_cb = nullptr, const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds::zero(), const std::function<void()>& worker_teardown_cb = nullptr);
+
+// Register the given logger with the given name
+void register_logger(std::shared_ptr<logger> logger);
+
+// Apply a user defined function on all registered loggers
+// Example:
+// spdlog::apply_all([&](std::shared_ptr<spdlog::logger> l) {l->flush();});
+void apply_all(std::function<void(std::shared_ptr<logger>)> fun);
+
+// Drop the reference to the given logger
+void drop(const std::string &name);
+
+// Drop all references from the registry
+void drop_all();
+
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// Trace & Debug can be switched on/off at compile time for zero cost debug statements.
+// Uncomment SPDLOG_DEBUG_ON/SPDLOG_TRACE_ON in tweakme.h to enable.
+// SPDLOG_TRACE(..) will also print current file and line.
+//
+// Example:
+// spdlog::set_level(spdlog::level::trace);
+// SPDLOG_TRACE(my_logger, "some trace message");
+// SPDLOG_TRACE(my_logger, "another trace message {} {}", 1, 2);
+// SPDLOG_DEBUG(my_logger, "some debug message {} {}", 3, 4);
+///////////////////////////////////////////////////////////////////////////////
+
+#ifdef SPDLOG_TRACE_ON
+#  define SPDLOG_STR_H(x) #x
+#  define SPDLOG_STR_HELPER(x) SPDLOG_STR_H(x)
+#  ifdef _MSC_VER
+#    define SPDLOG_TRACE(logger, ...) logger->trace("[ " __FILE__ "(" SPDLOG_STR_HELPER(__LINE__) ") ] " __VA_ARGS__)
+#  else
+#    define SPDLOG_TRACE(logger, ...) logger->trace("[ " __FILE__ ":" SPDLOG_STR_HELPER(__LINE__) " ] " __VA_ARGS__)
+#  endif
+#else
+#  define SPDLOG_TRACE(logger, ...) (void)0
+#endif
+
+#ifdef SPDLOG_DEBUG_ON
+#  define SPDLOG_DEBUG(logger, ...) logger->debug(__VA_ARGS__)
+#else
+#  define SPDLOG_DEBUG(logger, ...) (void)0
+#endif
+
+}
+
+#include "details/spdlog_impl.h"
diff --git a/3d_party/spd_log/include/spdlog/tweakme.h b/3d_party/spd_log/include/spdlog/tweakme.h
new file mode 100644
index 000000000..ad01a09c0
--- /dev/null
+++ b/3d_party/spd_log/include/spdlog/tweakme.h
@@ -0,0 +1,160 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// Edit this file to squeeze more performance, and to customize supported features
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Under Linux, the much faster CLOCK_REALTIME_COARSE clock can be used.
+// This clock is less accurate - can be off by dozens of millis - depending on the kernel HZ.
+// Uncomment to use it instead of the regular clock.
+//
+// #define SPDLOG_CLOCK_COARSE
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment if date/time logging is not needed and never appear in the log pattern.
+// This will prevent spdlog from querying the clock on each log call.
+//
+// WARNING: If the log pattern contains any date/time while this flag is on, the result is undefined.
+//          You must set new pattern(spdlog::set_pattern(..") without any date/time in it
+//
+// #define SPDLOG_NO_DATETIME
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment if thread id logging is not needed (i.e. no %t in the log pattern).
+// This will prevent spdlog from querying the thread id on each log call.
+//
+// WARNING: If the log pattern contains thread id (i.e, %t) while this flag is on, the result is undefined.
+//
+// #define SPDLOG_NO_THREAD_ID
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to prevent spdlog from caching thread ids in thread local storage.
+// By default spdlog saves thread ids in tls to gain a few micros for each call.
+//
+// WARNING: if your program forks, UNCOMMENT this flag to prevent undefined thread ids in the children logs.
+//
+// #define SPDLOG_DISABLE_TID_CACHING
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment if logger name logging is not needed.
+// This will prevent spdlog from copying the logger name  on each log call.
+//
+// #define SPDLOG_NO_NAME
+///////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable the SPDLOG_DEBUG/SPDLOG_TRACE macros.
+//
+// #define SPDLOG_DEBUG_ON
+// #define SPDLOG_TRACE_ON
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to avoid locking in the registry operations (spdlog::get(), spdlog::drop() spdlog::register()).
+// Use only if your code never modifies concurrently the registry.
+// Note that upon creating a logger the registry is modified by spdlog..
+//
+// #define SPDLOG_NO_REGISTRY_MUTEX
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to avoid spdlog's usage of atomic log levels
+// Use only if your code never modifies a logger's log levels concurrently by different threads.
+//
+// #define SPDLOG_NO_ATOMIC_LEVELS
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable usage of wchar_t for file names on Windows.
+//
+// #define SPDLOG_WCHAR_FILENAMES
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to override default eol ("\n" or "\r\n" under Linux/Windows)
+//
+// #define SPDLOG_EOL ";-)\n"
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to use your own copy of the fmt library instead of spdlog's copy.
+// In this case spdlog will try to include <fmt/format.h> so set your -I flag accordingly.
+//
+// #define SPDLOG_FMT_EXTERNAL
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to use printf-style messages in your logs instead of the usual
+// format-style used by default.
+//
+// #define SPDLOG_FMT_PRINTF
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable syslog (disabled by default)
+//
+// #define SPDLOG_ENABLE_SYSLOG
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable wchar_t support (convert to utf8)
+//
+// #define SPDLOG_WCHAR_TO_UTF8_SUPPORT
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to prevent child processes from inheriting log file descriptors
+//
+// #define SPDLOG_PREVENT_CHILD_FD
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment if your compiler doesn't support the "final" keyword.
+// The final keyword allows more optimizations in release
+// mode with recent compilers. See GCC's documentation for -Wsuggest-final-types
+// for instance.
+//
+// #define SPDLOG_NO_FINAL
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable message counting feature.
+// Use the %i in the logger pattern to display log message sequence id.
+//
+// #define SPDLOG_ENABLE_MESSAGE_COUNTER
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to customize level names (e.g. "MT TRACE")
+//
+// #define SPDLOG_LEVEL_NAMES  { "MY TRACE", "MY DEBUG", "MY INFO", "MY WARNING", "MY ERROR", "MY CRITICAL", "OFF" }
+///////////////////////////////////////////////////////////////////////////////
diff --git a/3d_party/spd_log/readme b/3d_party/spd_log/readme
new file mode 100644
index 000000000..c77cda24b
--- /dev/null
+++ b/3d_party/spd_log/readme
@@ -0,0 +1 @@
+https://github.com/gabime/spdlog/archive/v0.16.3.tar.gz
diff --git a/common/cpp/CMakeLists.txt b/common/cpp/CMakeLists.txt
index 981bb1f44..e56f7e57a 100644
--- a/common/cpp/CMakeLists.txt
+++ b/common/cpp/CMakeLists.txt
@@ -8,6 +8,9 @@ add_subdirectory(src/data_structs)
 
 add_subdirectory(src/http_client)
 
+add_subdirectory(src/logger)
+
+
 if(BUILD_MONGODB_CLIENTLIB)
     add_subdirectory(src/database)
 endif()
diff --git a/common/cpp/include/http_client/http_client.h b/common/cpp/include/http_client/http_client.h
index 92a929961..fe913b582 100644
--- a/common/cpp/include/http_client/http_client.h
+++ b/common/cpp/include/http_client/http_client.h
@@ -16,6 +16,8 @@ class HttpClient {
 
 };
 
+std::unique_ptr<HttpClient> DefaultHttpClient();
+
 enum class HttpCode : int {
     Continue           = 100,
     SwitchingProtocols = 101,
diff --git a/common/cpp/include/logger/logger.h b/common/cpp/include/logger/logger.h
new file mode 100644
index 000000000..7e2bd50e4
--- /dev/null
+++ b/common/cpp/include/logger/logger.h
@@ -0,0 +1,34 @@
+#ifndef HIDRA2_LOGGER_H
+#define HIDRA2_LOGGER_H
+
+#include <memory>
+#include <string>
+
+namespace hidra2 {
+
+enum class LogLevel {
+    None,
+    Error,
+    Info,
+    Debug,
+    Warning
+};
+
+class AbstractLogger {
+ public:
+    virtual void SetLogLevel(LogLevel level) = 0;
+    virtual void Info(const std::string& text) = 0;
+    virtual void Error(const std::string& text) = 0;
+    virtual void Debug(const std::string& text) = 0;
+    virtual void Warning(const std::string& text) = 0;
+
+};
+
+using Logger = std::unique_ptr<AbstractLogger>;
+
+Logger CreateDefaultLoggerBin(const std::string& name);
+Logger CreateDefaultLoggerApi(const std::string& name,const std::string& endpoint_uri);
+
+}
+
+#endif //HIDRA2_LOGGER_H
diff --git a/common/cpp/src/http_client/CMakeLists.txt b/common/cpp/src/http_client/CMakeLists.txt
index 42e3f0659..0ba039896 100644
--- a/common/cpp/src/http_client/CMakeLists.txt
+++ b/common/cpp/src/http_client/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(TARGET_NAME curl_http_client)
 set(SOURCE_FILES
         curl_http_client.cpp
-        ../../include/unittests/MockDatabase.h)
+        http_client_factory.cpp)
 
 
 ################################
diff --git a/common/cpp/src/http_client/curl_http_client.cpp b/common/cpp/src/http_client/curl_http_client.cpp
index a6c98fa13..752e4a58e 100644
--- a/common/cpp/src/http_client/curl_http_client.cpp
+++ b/common/cpp/src/http_client/curl_http_client.cpp
@@ -1,4 +1,4 @@
-#include "http_client/curl_http_client.h"
+#include "curl_http_client.h"
 
 #include <cstring>
 
diff --git a/common/cpp/include/http_client/curl_http_client.h b/common/cpp/src/http_client/curl_http_client.h
similarity index 95%
rename from common/cpp/include/http_client/curl_http_client.h
rename to common/cpp/src/http_client/curl_http_client.h
index 9b65491aa..aab0b740c 100644
--- a/common/cpp/include/http_client/curl_http_client.h
+++ b/common/cpp/src/http_client/curl_http_client.h
@@ -4,7 +4,7 @@
 #include <string>
 #include <mutex>
 
-#include "http_client.h"
+#include "http_client/http_client.h"
 #include "curl/curl.h"
 
 namespace hidra2 {
diff --git a/common/cpp/src/http_client/http_client_factory.cpp b/common/cpp/src/http_client/http_client_factory.cpp
new file mode 100644
index 000000000..dabaea7e8
--- /dev/null
+++ b/common/cpp/src/http_client/http_client_factory.cpp
@@ -0,0 +1,10 @@
+#include "curl_http_client.h"
+
+namespace hidra2 {
+
+std::unique_ptr<HttpClient> DefaultHttpClient() {
+    return std::unique_ptr<HttpClient>{new CurlHttpClient};
+}
+
+
+}
diff --git a/common/cpp/src/logger/CMakeLists.txt b/common/cpp/src/logger/CMakeLists.txt
new file mode 100644
index 000000000..17873877d
--- /dev/null
+++ b/common/cpp/src/logger/CMakeLists.txt
@@ -0,0 +1,23 @@
+set(TARGET_NAME logger)
+set(SOURCE_FILES
+        spd_logger.cpp spd_logger.h logger_factory.cpp fluentd_sink.cpp fluentd_sink.h)
+
+################################
+# Library
+################################
+
+add_library(${TARGET_NAME} OBJECT ${SOURCE_FILES})
+
+target_include_directories(${TARGET_NAME} PUBLIC ${HIDRA2_CXX_COMMON_INCLUDE_DIR}
+        ${CMAKE_SOURCE_DIR}/3d_party/spd_log/include)
+
+################################
+# Testing
+################################
+
+
+set(TEST_SOURCE_FILES ../../unittests/logger/test_logger.cpp)
+
+set(TEST_LIBRARIES "${TARGET_NAME};curl_http_client;${CURL_LIBRARIES}")
+include_directories(${HIDRA2_CXX_COMMON_INCLUDE_DIR} ${CMAKE_SOURCE_DIR}/3d_party/spd_log/include)
+gtest(${TARGET_NAME} "${TEST_SOURCE_FILES}" "${TEST_LIBRARIES}")
diff --git a/common/cpp/src/logger/fluentd_sink.cpp b/common/cpp/src/logger/fluentd_sink.cpp
new file mode 100644
index 000000000..62012a82d
--- /dev/null
+++ b/common/cpp/src/logger/fluentd_sink.cpp
@@ -0,0 +1,24 @@
+#include "fluentd_sink.h"
+
+#include <iostream>
+
+namespace hidra2 {
+
+void FluentdSink::_sink_it(const spdlog::details::log_msg &msg) {
+    std::string log_str = msg.formatted.str();
+    HttpCode code;
+    Error err;
+    log_str.erase(log_str.find_last_not_of("\n\r\t")+1);
+    std::string string_to_send = "json={\"message\":\""+log_str+"\"}";
+    httpclient__->Post(endpoint_uri_,string_to_send,&code,&err);
+    if (err){
+        std::cerr<<err->Explain();
+    }
+}
+
+FluentdSink::FluentdSink(const std::string& endpoint_uri):httpclient__{DefaultHttpClient()},endpoint_uri_{endpoint_uri} {
+
+};
+
+
+}
diff --git a/common/cpp/src/logger/fluentd_sink.h b/common/cpp/src/logger/fluentd_sink.h
new file mode 100644
index 000000000..cf59c4a02
--- /dev/null
+++ b/common/cpp/src/logger/fluentd_sink.h
@@ -0,0 +1,26 @@
+#ifndef HIDRA2_FLUENTD_SINK_H
+#define HIDRA2_FLUENTD_SINK_H
+
+#include "spdlog/spdlog.h"
+#include "spdlog/sinks/sink.h"
+#include "spdlog/sinks/base_sink.h"
+#include "http_client/http_client.h"
+
+namespace hidra2 {
+
+class FluentdSink : public spdlog::sinks::base_sink<std::mutex>
+{
+ public:
+    FluentdSink(const std::string& endpoint_uri);
+    std::unique_ptr<HttpClient> httpclient__;
+ protected:
+    void _sink_it(const spdlog::details::log_msg& msg) override;
+    void _flush() override{};
+ private:
+    std::string endpoint_uri_;
+};
+
+}
+
+
+#endif //HIDRA2_FLUENTD_SINK_H
diff --git a/common/cpp/src/logger/logger_factory.cpp b/common/cpp/src/logger/logger_factory.cpp
new file mode 100644
index 000000000..be5058749
--- /dev/null
+++ b/common/cpp/src/logger/logger_factory.cpp
@@ -0,0 +1,28 @@
+#include "spd_logger.h"
+
+namespace hidra2 {
+
+Logger CreateLogger(std::string name,bool console,bool centralized_log,const std::string& endpoint_uri) {
+    auto logger = new SpdLogger{name,endpoint_uri};
+    logger->SetLogLevel(LogLevel::Error);
+    if (console) {
+        logger->EnableConsoleLog(true);
+    }
+    if (centralized_log) {
+        logger->EnableCentralizedLog(true);
+    }
+
+    return Logger{logger};
+}
+
+
+Logger CreateDefaultLoggerBin(const std::string& name) {
+    return CreateLogger(name,true,false,"");
+}
+
+Logger CreateDefaultLoggerApi(const std::string& name,const std::string& endpoint_uri) {
+    return CreateLogger(name,false,true,endpoint_uri);
+}
+
+
+};
\ No newline at end of file
diff --git a/common/cpp/src/logger/spd_logger.cpp b/common/cpp/src/logger/spd_logger.cpp
new file mode 100644
index 000000000..e857bcf08
--- /dev/null
+++ b/common/cpp/src/logger/spd_logger.cpp
@@ -0,0 +1,83 @@
+#include "spd_logger.h"
+
+#include "fluentd_sink.h"
+
+namespace hidra2 {
+
+void SpdLogger::SetLogLevel(LogLevel level) {
+    if (log_) {
+        switch (level){
+            case LogLevel::None:
+                log_->set_level(spdlog::level::off);
+                break;
+            case LogLevel::Debug:
+                log_->set_level(spdlog::level::debug);
+                break;
+            case LogLevel::Error:
+                log_->set_level(spdlog::level::err);
+                break;
+            case LogLevel::Warning:
+                log_->set_level(spdlog::level::warn);
+                break;
+            case LogLevel::Info:
+                log_->set_level(spdlog::level::info);
+                break;
+            default:
+                log_->set_level(spdlog::level::err);
+        }
+    }
+}
+
+void SpdLogger::Info(const std::string &text) {
+    if (log_) {
+        log_->info(text);
+    }
+}
+
+void SpdLogger::EnableConsoleLog(bool enable) {
+    console_log_ = enable;
+    UpdateLoggerSinks();
+}
+
+void SpdLogger::UpdateLoggerSinks() {
+    sinks_.clear();
+    if (console_log_) {
+    sinks_.push_back(std::make_shared<spdlog::sinks::stdout_sink_mt>());
+    }
+
+    if (centralized_log_) {
+        sinks_.push_back(std::make_shared<FluentdSink>(endpoint_uri_));
+    }
+
+    log_ = std::make_shared<spdlog::logger>(name_, std::begin(sinks_), std::end(sinks_));
+}
+
+SpdLogger::SpdLogger(const std::string& name,const std::string& endpoint_uri): name_{name},endpoint_uri_{endpoint_uri}
+{
+
+}
+void SpdLogger::Error(const std::string &text) {
+    if (log_) {
+        log_->error(text);
+    }
+
+}
+void SpdLogger::Debug(const std::string &text) {
+    if (log_) {
+        log_->debug(text);
+    }
+
+}
+
+void SpdLogger::Warning(const std::string &text) {
+    if (log_) {
+        log_->warn(text);
+    }
+}
+
+void SpdLogger::EnableCentralizedLog(bool enable) {
+    centralized_log_ = enable;
+    UpdateLoggerSinks();
+}
+
+}
\ No newline at end of file
diff --git a/common/cpp/src/logger/spd_logger.h b/common/cpp/src/logger/spd_logger.h
new file mode 100644
index 000000000..c37fe52f6
--- /dev/null
+++ b/common/cpp/src/logger/spd_logger.h
@@ -0,0 +1,31 @@
+#ifndef HIDRA2_SPDLOGGER_H
+#define HIDRA2_SPDLOGGER_H
+
+#include "logger/logger.h"
+#include "spdlog/spdlog.h"
+
+namespace hidra2 {
+
+class SpdLogger : public AbstractLogger {
+ public:
+    explicit SpdLogger(const std::string& name,const std::string& endpoint_uri);
+    void SetLogLevel(LogLevel level) override;
+    void Info(const std::string &text) override;
+    void Error(const std::string &text) override;
+    void Debug(const std::string &text) override;
+    void Warning(const std::string &text) override;
+    void EnableConsoleLog(bool enable);
+    void EnableCentralizedLog(bool enable);
+ private:
+    std::string name_;
+    std::string endpoint_uri_;
+    std::vector<spdlog::sink_ptr> sinks_;
+    bool console_log_ = false;
+    bool centralized_log_ = false;
+    void UpdateLoggerSinks();
+    std::shared_ptr<spdlog::logger> log_;
+
+};
+}
+
+#endif //HIDRA2_SPDLOGGER_H
diff --git a/common/cpp/unittests/logger/test_logger.cpp b/common/cpp/unittests/logger/test_logger.cpp
new file mode 100644
index 000000000..8134e61f5
--- /dev/null
+++ b/common/cpp/unittests/logger/test_logger.cpp
@@ -0,0 +1,33 @@
+#include <gmock/gmock.h>
+#include "gtest/gtest.h"
+
+//#include "json_parser/json_parser.h"
+
+#include "../../src/logger/spd_logger.h"
+
+using ::testing::AtLeast;
+using ::testing::Eq;
+using ::testing::Ne;
+using ::testing::Test;
+using ::testing::_;
+using ::testing::Mock;
+using ::testing::NiceMock;
+using ::testing::Return;
+using ::testing::SetArgPointee;
+using ::testing::HasSubstr;
+using ::testing::ElementsAre;
+
+
+namespace {
+
+TEST(DefaultLogger, BinLogger) {
+    auto logger = hidra2::CreateDefaultLoggerBin("test");
+    ASSERT_THAT(dynamic_cast<hidra2::SpdLogger*>(logger.get()), Ne(nullptr));
+}
+
+TEST(DefaultLogger, ApiLogger) {
+    auto logger = hidra2::CreateDefaultLoggerApi("test","endpoint");
+    ASSERT_THAT(dynamic_cast<hidra2::SpdLogger*>(logger.get()), Ne(nullptr));
+}
+
+}
diff --git a/config/fluentd/fluentd.conf b/config/fluentd/fluentd.conf
new file mode 100644
index 000000000..d7346cb66
--- /dev/null
+++ b/config/fluentd/fluentd.conf
@@ -0,0 +1,13 @@
+<source>
+ @type http
+ port 9880
+ bind 0.0.0.0
+</source>
+<match asapo>
+  @type file
+  buffer_type memory
+  flush_interval 1s
+  path fluentd/etc/asapo
+  time_slice_format %Y%m%d
+  format single_value
+</match>
diff --git a/examples/worker/getnext_broker/CMakeLists.txt b/examples/worker/getnext_broker/CMakeLists.txt
index 03483d371..3d9f18bf7 100644
--- a/examples/worker/getnext_broker/CMakeLists.txt
+++ b/examples/worker/getnext_broker/CMakeLists.txt
@@ -10,6 +10,9 @@ set_target_properties(${TARGET_NAME} PROPERTIES RUNTIME_OUTPUT_DIRECTORY
         )
 
 get_target_property(VAR ${TARGET_NAME} RUNTIME_OUTPUT_DIRECTORY)
+add_dependencies(${TARGET_NAME} hidra2-broker)
+
+
 
 configure_file(${CMAKE_SOURCE_DIR}/tests/automatic/settings/broker_settings.json settings.json COPYONLY)
 add_script_test("${TARGET_NAME}" "${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME} $<TARGET_PROPERTY:hidra2-broker,EXENAME>")
diff --git a/receiver/CMakeLists.txt b/receiver/CMakeLists.txt
index a5d795a7c..3b188cff5 100644
--- a/receiver/CMakeLists.txt
+++ b/receiver/CMakeLists.txt
@@ -19,7 +19,7 @@ set(SOURCE_FILES
 add_library(${TARGET_NAME} STATIC ${SOURCE_FILES} $<TARGET_OBJECTS:system_io> $<TARGET_OBJECTS:curl_http_client>
          $<TARGET_OBJECTS:json_parser>)
 set_target_properties(${TARGET_NAME} PROPERTIES LINKER_LANGUAGE CXX)
-target_include_directories(${TARGET_NAME} PUBLIC ${HIDRA2_CXX_COMMON_INCLUDE_DIR} ${CURL_INCLUDE_DIRS})
+target_include_directories(${TARGET_NAME} PUBLIC ${HIDRA2_CXX_COMMON_INCLUDE_DIR})
 target_link_libraries(${TARGET_NAME} ${CURL_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} database)
 
 
diff --git a/receiver/src/statistics_sender_influx_db.cpp b/receiver/src/statistics_sender_influx_db.cpp
index 84f8b07d4..8e43792ac 100644
--- a/receiver/src/statistics_sender_influx_db.cpp
+++ b/receiver/src/statistics_sender_influx_db.cpp
@@ -3,7 +3,6 @@
 #include <iostream>
 
 #include "statistics.h"
-#include "http_client/curl_http_client.h"
 #include "receiver_config.h"
 
 namespace hidra2 {
@@ -45,7 +44,7 @@ std::string StatisticsSenderInfluxDb::StatisticsToString(const StatisticsToSend&
     return str;
 }
 
-StatisticsSenderInfluxDb::StatisticsSenderInfluxDb(): httpclient__{new CurlHttpClient} {
+StatisticsSenderInfluxDb::StatisticsSenderInfluxDb(): httpclient__{DefaultHttpClient()} {
 };
 
 
diff --git a/receiver/unittests/test_statistics_sender_influx_db.cpp b/receiver/unittests/test_statistics_sender_influx_db.cpp
index 0324253dd..f12c4aff2 100644
--- a/receiver/unittests/test_statistics_sender_influx_db.cpp
+++ b/receiver/unittests/test_statistics_sender_influx_db.cpp
@@ -4,7 +4,7 @@
 
 #include "../src/statistics_sender_influx_db.h"
 #include "../src/statistics_sender.h"
-#include "http_client/curl_http_client.h"
+#include "../../common/cpp/src/http_client/curl_http_client.h"
 #include "unittests/MockHttpClient.h"
 #include "../src/statistics.h"
 
diff --git a/tests/automatic/CMakeLists.txt b/tests/automatic/CMakeLists.txt
index f041b5fe8..bc93ec01b 100644
--- a/tests/automatic/CMakeLists.txt
+++ b/tests/automatic/CMakeLists.txt
@@ -22,4 +22,6 @@ add_subdirectory(curl_http_client)
 
 add_subdirectory(producer_receiver)
 
-add_subdirectory(full_chain)
\ No newline at end of file
+add_subdirectory(full_chain)
+
+add_subdirectory(spd_logger)
diff --git a/tests/automatic/spd_logger/CMakeLists.txt b/tests/automatic/spd_logger/CMakeLists.txt
new file mode 100644
index 000000000..5c2f5162c
--- /dev/null
+++ b/tests/automatic/spd_logger/CMakeLists.txt
@@ -0,0 +1,4 @@
+CMAKE_MINIMUM_REQUIRED(VERSION 3.7) # needed for fixtures
+
+add_subdirectory(console)
+add_subdirectory(fluentd)
diff --git a/tests/automatic/spd_logger/console/CMakeLists.txt b/tests/automatic/spd_logger/console/CMakeLists.txt
new file mode 100644
index 000000000..6926abb08
--- /dev/null
+++ b/tests/automatic/spd_logger/console/CMakeLists.txt
@@ -0,0 +1,16 @@
+set(TARGET_NAME spd_logger_console)
+
+set(SOURCE_FILES spd_logger_console.cpp)
+
+################################
+# Executable and link
+################################
+add_executable(${TARGET_NAME} ${SOURCE_FILES} $<TARGET_OBJECTS:logger> $<TARGET_OBJECTS:curl_http_client>)
+target_link_libraries(${TARGET_NAME} ${CURL_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+target_include_directories(${TARGET_NAME} PUBLIC ${HIDRA2_CXX_COMMON_INCLUDE_DIR})
+
+
+################################
+# Testing
+################################
+add_script_test("${TARGET_NAME}" "$<TARGET_FILE:${TARGET_NAME}>")
diff --git a/tests/automatic/spd_logger/console/check_linux.sh b/tests/automatic/spd_logger/console/check_linux.sh
new file mode 100644
index 000000000..c79439107
--- /dev/null
+++ b/tests/automatic/spd_logger/console/check_linux.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -e
+
+res=`$1`
+
+echo $res | grep "\[info\] test_info"
+echo $res | grep "\[error\] test_error"
+echo $res | grep "\[debug\] test_debug"
+echo $res | grep "\[warning\] test_warning"
+echo $res | grep "test_info_mt_0"
+echo $res | grep "test_info_mt_1"
+echo $res | grep "test_info_mt_2"
+echo $res | grep "test_info_mt_3"
+echo $res | grep "test_logger"
+
+
+#error_lev
+echo $res | grep "test_error_errorlev"
+! echo $res | grep "test_debug_errorlev"
+! echo $res | grep "test_info_errorlev"
+! echo $res | grep "test_warning_errorlev"
+
+
+#warning_lev
+echo $res | grep "test_error_warninglev"
+! echo $res | grep "test_debug_warninglev"
+! echo $res | grep "test_info_warninglev"
+echo $res | grep "test_warning_warninglev"
+
+
+#info_lev
+echo $res | grep "test_error_infolev"
+! echo $res | grep "test_debug_infolev"
+echo $res | grep "test_info_infolev"
+echo $res | grep "test_warning_infolev"
+
+
+#none_lev
+! echo $res | grep "nonelev"
diff --git a/tests/automatic/spd_logger/console/check_windows.bat b/tests/automatic/spd_logger/console/check_windows.bat
new file mode 100644
index 000000000..8a470b403
--- /dev/null
+++ b/tests/automatic/spd_logger/console/check_windows.bat
@@ -0,0 +1,31 @@
+set full_recv_name="%2"
+set short_recv_name="%~nx2"
+
+start /B "" "%full_recv_name%" receiver.json
+
+ping 1.0.0.0 -n 1 -w 100 > nul
+
+mkdir files
+
+%1 localhost:4200 100 1
+
+ping 1.0.0.0 -n 1 -w 100 > nul
+
+FOR /F "usebackq" %%A IN ('files\1.bin') DO set size=%%~zA
+
+if %size% NEQ 102400 goto :error
+
+goto :clean
+
+:error
+call :clean
+exit /b 1
+
+:clean
+Taskkill /IM "%short_recv_name%" /F
+rmdir /S /Q files
+SET database_name=test_run
+SET mongo_exe="c:\Program Files\MongoDB\Server\3.6\bin\mongo.exe"
+echo db.dropDatabase() | %mongo_exe% %database_name%
+
+
diff --git a/tests/automatic/spd_logger/console/spd_logger_console.cpp b/tests/automatic/spd_logger/console/spd_logger_console.cpp
new file mode 100644
index 000000000..9a04abfa6
--- /dev/null
+++ b/tests/automatic/spd_logger/console/spd_logger_console.cpp
@@ -0,0 +1,60 @@
+#include <thread>
+#include <vector>
+
+#include "logger/logger.h"
+
+using namespace hidra2;
+
+int main(int argc, char* argv[]) {
+
+    auto logger = CreateDefaultLoggerBin("test_logger");
+
+    logger->SetLogLevel(LogLevel::Debug);
+
+    auto exec = [&](const std::string& i) {
+        logger->Info("test_info_mt_" + i);
+    };
+
+    std::vector<std::thread> threads;
+    for (int i = 0; i < 4; i++) {
+        threads.emplace_back(std::thread(exec, std::to_string(i)));
+    }
+
+    for (auto& thread : threads) {
+        thread.join();
+    }
+
+    logger->Info("test_info");
+    logger->Error("test_error");
+    logger->Warning("test_warning");
+    logger->Debug("test_debug");
+
+
+    logger->SetLogLevel(LogLevel::Error);
+    logger->Info("test_info_errorlev");
+    logger->Error("test_error_errorlev");
+    logger->Warning("test_warning_errorlev");
+    logger->Debug("test_debug_errorlev");
+
+
+    logger->SetLogLevel(LogLevel::Warning);
+    logger->Info("test_info_warninglev");
+    logger->Error("test_error_warninglev");
+    logger->Warning("test_warning_warninglev");
+    logger->Debug("test_debug_warninglev");
+
+    logger->SetLogLevel(LogLevel::Info);
+    logger->Info("test_info_infolev");
+    logger->Error("test_error_infolev");
+    logger->Warning("test_warning_infolev");
+    logger->Debug("test_debug_infolev");
+
+    logger->SetLogLevel(LogLevel::None);
+    logger->Info("test_info_nonelev");
+    logger->Error("test_error_nonelev");
+    logger->Warning("test_warning_nonelev");
+    logger->Debug("test_debug_nonelev");
+
+
+    return 0;
+}
diff --git a/tests/automatic/spd_logger/fluentd/CMakeLists.txt b/tests/automatic/spd_logger/fluentd/CMakeLists.txt
new file mode 100644
index 000000000..b5fd46924
--- /dev/null
+++ b/tests/automatic/spd_logger/fluentd/CMakeLists.txt
@@ -0,0 +1,15 @@
+set(TARGET_NAME spd_logger_fluentd)
+
+set(SOURCE_FILES spd_logger_fluentd.cpp)
+
+################################
+# Executable and link
+################################
+add_executable(${TARGET_NAME} ${SOURCE_FILES} $<TARGET_OBJECTS:logger> $<TARGET_OBJECTS:curl_http_client>)
+target_include_directories(${TARGET_NAME} PUBLIC ${HIDRA2_CXX_COMMON_INCLUDE_DIR})
+target_link_libraries(${TARGET_NAME} ${CURL_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+
+################################
+# Testing
+################################
+add_script_test("${TARGET_NAME}" "$<TARGET_FILE:${TARGET_NAME}>")
diff --git a/tests/automatic/spd_logger/fluentd/check_linux.sh b/tests/automatic/spd_logger/fluentd/check_linux.sh
new file mode 100644
index 000000000..03ebe0750
--- /dev/null
+++ b/tests/automatic/spd_logger/fluentd/check_linux.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+set -e
+
+
+rm -f $HOME/fluentd/asapo.*.log
+
+$1
+
+sleep 2
+
+cat $HOME/fluentd/asapo.*.log
+
+res=`cat $HOME/fluentd/asapo.*.log`
+
+echo $res | grep "test_info"
+echo $res | grep "test_error"
+echo $res | grep "test_debug"
+echo $res | grep "test_warning"
+
diff --git a/tests/automatic/spd_logger/fluentd/check_windows.bat b/tests/automatic/spd_logger/fluentd/check_windows.bat
new file mode 100644
index 000000000..8a470b403
--- /dev/null
+++ b/tests/automatic/spd_logger/fluentd/check_windows.bat
@@ -0,0 +1,31 @@
+set full_recv_name="%2"
+set short_recv_name="%~nx2"
+
+start /B "" "%full_recv_name%" receiver.json
+
+ping 1.0.0.0 -n 1 -w 100 > nul
+
+mkdir files
+
+%1 localhost:4200 100 1
+
+ping 1.0.0.0 -n 1 -w 100 > nul
+
+FOR /F "usebackq" %%A IN ('files\1.bin') DO set size=%%~zA
+
+if %size% NEQ 102400 goto :error
+
+goto :clean
+
+:error
+call :clean
+exit /b 1
+
+:clean
+Taskkill /IM "%short_recv_name%" /F
+rmdir /S /Q files
+SET database_name=test_run
+SET mongo_exe="c:\Program Files\MongoDB\Server\3.6\bin\mongo.exe"
+echo db.dropDatabase() | %mongo_exe% %database_name%
+
+
diff --git a/tests/automatic/spd_logger/fluentd/spd_logger_fluentd.cpp b/tests/automatic/spd_logger/fluentd/spd_logger_fluentd.cpp
new file mode 100644
index 000000000..82a893aef
--- /dev/null
+++ b/tests/automatic/spd_logger/fluentd/spd_logger_fluentd.cpp
@@ -0,0 +1,20 @@
+#include <thread>
+#include <vector>
+
+#include "logger/logger.h"
+
+using namespace hidra2;
+
+int main(int argc, char* argv[]) {
+
+    auto logger = CreateDefaultLoggerApi("test_central","http://localhost:9880/asapo");
+
+    logger->SetLogLevel(LogLevel::Debug);
+
+    logger->Info("test_info");
+    logger->Error("test_error");
+    logger->Warning("test_warning");
+    logger->Debug("test_debug");
+
+    return 0;
+}
diff --git a/tests/automatic/worker/next_multithread_broker/next_multithread_broker.cpp b/tests/automatic/worker/next_multithread_broker/next_multithread_broker.cpp
index dcbbede48..9640d6098 100644
--- a/tests/automatic/worker/next_multithread_broker/next_multithread_broker.cpp
+++ b/tests/automatic/worker/next_multithread_broker/next_multithread_broker.cpp
@@ -58,7 +58,6 @@ void GetAllFromBroker(const Args& args) {
 
     std::vector<std::thread> threads;
     for (int i = 0; i < args.nthreads; i++) {
-        exec_next(i);
         threads.emplace_back(std::thread(exec_next, i));
     }
 
diff --git a/worker/api/cpp/CMakeLists.txt b/worker/api/cpp/CMakeLists.txt
index f60a32686..f1e94bf53 100644
--- a/worker/api/cpp/CMakeLists.txt
+++ b/worker/api/cpp/CMakeLists.txt
@@ -13,8 +13,7 @@ set(SOURCE_FILES
 add_library(${TARGET_NAME} STATIC ${SOURCE_FILES} $<TARGET_OBJECTS:system_io>
             $<TARGET_OBJECTS:json_parser> $<TARGET_OBJECTS:data_structs> $<TARGET_OBJECTS:curl_http_client> )
 
-target_include_directories(${TARGET_NAME} PUBLIC include ${HIDRA2_CXX_COMMON_INCLUDE_DIR}
-        ${CURL_INCLUDE_DIRS})
+target_include_directories(${TARGET_NAME} PUBLIC include ${HIDRA2_CXX_COMMON_INCLUDE_DIR})
 
 IF(CMAKE_C_COMPILER_ID STREQUAL "GNU")
     SET( CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} -static-libgcc -static-libstdc++")
diff --git a/worker/api/cpp/src/server_data_broker.cpp b/worker/api/cpp/src/server_data_broker.cpp
index fcbd1d449..37ef745d6 100644
--- a/worker/api/cpp/src/server_data_broker.cpp
+++ b/worker/api/cpp/src/server_data_broker.cpp
@@ -1,13 +1,10 @@
 #include "server_data_broker.h"
 
-
 #include <chrono>
 
-
 #include "io/io_factory.h"
-#include "http_client/curl_http_client.h"
-#include "http_client/http_error.h"
 
+#include "http_client/http_error.h"
 
 using std::chrono::high_resolution_clock;
 
@@ -42,7 +39,7 @@ Error HttpCodeToWorkerError(const HttpCode& code) {
 
 ServerDataBroker::ServerDataBroker(const std::string& server_uri,
                                    const std::string& source_name):
-    io__{GenerateDefaultIO()}, httpclient__{new CurlHttpClient},
+    io__{GenerateDefaultIO()}, httpclient__{DefaultHttpClient()},
 server_uri_{server_uri}, source_name_{source_name} {
 }
 
diff --git a/worker/api/cpp/unittests/test_server_broker.cpp b/worker/api/cpp/unittests/test_server_broker.cpp
index 13d85ba3e..a72f47cc4 100644
--- a/worker/api/cpp/unittests/test_server_broker.cpp
+++ b/worker/api/cpp/unittests/test_server_broker.cpp
@@ -5,7 +5,7 @@
 #include "io/io.h"
 #include "../../../../common/cpp/src/system_io/system_io.h"
 #include "../src/server_data_broker.h"
-#include "http_client/curl_http_client.h"
+#include "../../../../common/cpp/src/http_client/curl_http_client.h"
 #include "unittests/MockIO.h"
 #include "unittests/MockHttpClient.h"
 #include "http_client/http_error.h"
-- 
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