[Minor] Various improvements into the toolset detection scripts

cmake/Toolset.cmake

 if (COMPILER_GCC)
     # GCC flags
     set (COMPILER_DEBUG_FLAGS "-g -ggdb -g3 -ggdb3")
+    set (CXX_COMMON_FLAGS "-Weffc++")
     set (CMAKE_C_FLAGS_RELWITHDEBINFO      "${CMAKE_C_FLAGS_RELEASE} -O2 ${COMPILER_FAST_MATH} ${COMPILER_DEBUG_FLAGS}")
-    set (CMAKE_CXX_FLAGS_RELWITHDEBINFO    "${CMAKE_CXX_FLAGS_RELEASE} -O2 ${COMPILER_FAST_MATH} ${COMPILER_DEBUG_FLAGS}")
+    set (CMAKE_CXX_FLAGS_RELWITHDEBINFO    "${CMAKE_CXX_FLAGS_RELEASE} -O2 ${COMPILER_FAST_MATH} ${COMPILER_DEBUG_FLAGS} ${CXX_COMMON_FLAGS}")
 
     set (CMAKE_C_FLAGS_RELEASE         "${CMAKE_C_FLAGS_RELEASE} -O3 ${COMPILER_FAST_MATH} -fomit-frame-pointer")
-    set (CMAKE_CXX_FLAGS_RELEASE       "${CMAKE_CXX_FLAGS_RELEASE} -O3 ${COMPILER_FAST_MATH} -fomit-frame-pointer")
+    set (CMAKE_CXX_FLAGS_RELEASE       "${CMAKE_CXX_FLAGS_RELEASE} -O3 ${COMPILER_FAST_MATH} -fomit-frame-pointer  ${CXX_COMMON_FLAGS}")
 
     if (ENABLE_FULL_DEBUG MATCHES "ON")
         if (ENABLE_ANALYZER MATCHES "ON")
             endif()
         endif ()
         set (CMAKE_C_FLAGS_DEBUG           "${CMAKE_C_FLAGS_DEBUG} -O0 ${COMPILER_DEBUG_FLAGS}")
-        set (CMAKE_CXX_FLAGS_DEBUG         "${CMAKE_CXX_FLAGS_DEBUG} -O0 ${COMPILER_DEBUG_FLAGS}")
+        set (CMAKE_CXX_FLAGS_DEBUG         "${CMAKE_CXX_FLAGS_DEBUG} -O0 ${COMPILER_DEBUG_FLAGS} ${CXX_COMMON_FLAGS}")
     else()
         set (CMAKE_C_FLAGS_DEBUG           "${CMAKE_C_FLAGS_DEBUG} -Og  ${COMPILER_DEBUG_FLAGS}")
-        set (CMAKE_CXX_FLAGS_DEBUG         "${CMAKE_CXX_FLAGS_DEBUG} -Og ${COMPILER_DEBUG_FLAGS}")
+        set (CMAKE_CXX_FLAGS_DEBUG         "${CMAKE_CXX_FLAGS_DEBUG} -Og ${COMPILER_DEBUG_FLAGS} ${CXX_COMMON_FLAGS}")
     endif()
-else ()
+elseif (COMPILER_CLANG)
     # Clang flags
     set (COMPILER_DEBUG_FLAGS "-g -glldb -gdwarf-aranges -gdwarf-4")
+    set (CXX_COMMON_FLAGS "-Weffc++")
     set (CMAKE_C_FLAGS_RELEASE         "${CMAKE_C_FLAGS_RELEASE} -O2 -fomit-frame-pointer ${COMPILER_FAST_MATH}")
-    set (CMAKE_CXX_FLAGS_RELEASE       "${CMAKE_CXX_FLAGS_RELEASE} -O2 -fomit-frame-pointer ${COMPILER_FAST_MATH}")
+    set (CMAKE_CXX_FLAGS_RELEASE       "${CMAKE_CXX_FLAGS_RELEASE} -O2 -fomit-frame-pointer ${COMPILER_FAST_MATH} ${CXX_COMMON_FLAGS}")
 
     set (CMAKE_C_FLAGS_RELWITHDEBINFO      "${CMAKE_C_FLAGS_RELEASE} -O2 ${COMPILER_FAST_MATH} ${COMPILER_DEBUG_FLAGS}")
-    set (CMAKE_CXX_FLAGS_RELWITHDEBINFO    "${CMAKE_CXX_FLAGS_RELEASE} -O2 ${COMPILER_FAST_MATH} ${COMPILER_DEBUG_FLAGS}")
+    set (CMAKE_CXX_FLAGS_RELWITHDEBINFO    "${CMAKE_CXX_FLAGS_RELEASE} -O2 ${COMPILER_FAST_MATH} ${COMPILER_DEBUG_FLAGS} ${CXX_COMMON_FLAGS}")
 
     set (CMAKE_C_FLAGS_DEBUG           "${CMAKE_C_FLAGS_DEBUG} -O0 ${COMPILER_DEBUG_FLAGS}")
-    set (CMAKE_CXX_FLAGS_DEBUG         "${CMAKE_CXX_FLAGS_DEBUG} -O0 ${COMPILER_DEBUG_FLAGS}")
+    set (CMAKE_CXX_FLAGS_DEBUG         "${CMAKE_CXX_FLAGS_DEBUG} -O0 ${COMPILER_DEBUG_FLAGS} ${CXX_COMMON_FLAGS}")
 endif()
 
 
 endif()
 
 message (STATUS "Final CFLAGS: ${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UC}}")
-message (STATUS "Final CXXFLAGS: ${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_UC}}")
+message (STATUS "Final CXXFLAGS: ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE_UC}}")
 message (STATUS "Final link flags for shlib: ${CMAKE_SHARED_LINKER_FLAGS}")
 message (STATUS "Final link flags for exe: ${CMAKE_EXE_LINKER_FLAGS}")