Fix of using clang warn flag

Author: florianbecker

cmake/clang_warnings.cmake

@@ -40,7 +40,7 @@ set(WARNING_FLAGS
   -Wno-padded
 )
 
-set(WARNING_FLAGS_VERSION16
+set(WARNING_FLAGS_MACOS_VERSION16
 
   # Own parameter
   -Wno-unsafe-buffer-usage-in-container
@@ -50,8 +50,8 @@ foreach(WARNING_FLAG ${WARNING_FLAGS})
   set(WARNING_FLAGS_SPACED "${WARNING_FLAGS_SPACED} ${WARNING_FLAG}")
 endforeach()
 
-if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16)
-  foreach(WARNING_FLAG ${WARNING_FLAGS_VERSION16})
+if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16 AND CMAKE_CXX_COMPILER_ID MATCHES AppleClang)
+  foreach(WARNING_FLAG ${WARNING_FLAGS_MACOS_VERSION16})
     set(WARNING_FLAGS_SPACED "${WARNING_FLAGS_SPACED} ${WARNING_FLAG}")
   endforeach()
 endif()