Added -Wno-unused-function to necessary scheduler files when gcc>=7

scheduler/CMakeLists.txt

@@ -43,6 +43,15 @@ add_library (ctaschedulerunittests SHARED
 set_property(TARGET ctaschedulerunittests PROPERTY SOVERSION "${CTA_SOVERSION}")
 set_property(TARGET ctaschedulerunittests PROPERTY   VERSION "${CTA_LIBVERSION}")
 
+if(CMAKE_COMPILER_IS_GNUCC)
+  # Add -Wno-unused-function compiler flag if using gcc version 7 or greater
+  if (GCC_VERSION VERSION_EQUAL 7 OR GCC_VERSION VERSION_GREATER 7)
+    set_property(SOURCE OStoreDB/OStoreDBTest.cpp APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-unused-function")
+    set_property(SOURCE SchedulerDatabaseTest.cpp APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-unused-function")
+    set_property(SOURCE SchedulerTest.cpp APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-unused-function")
+  endif (GCC_VERSION VERSION_EQUAL 7 OR GCC_VERSION VERSION_GREATER 7)
+endif(CMAKE_COMPILER_IS_GNUCC)
+
 target_link_libraries (ctaschedulerunittests 
   ctascheduler)