fixes

cmake/helpers.cmake

@@ -19,13 +19,6 @@ endfunction(copy_support_files)
 function(set_common_target_options name)
   target_compile_definitions(${name} PUBLIC ${REPERTORY_DEFINITIONS})
 
-  if (UNIX OR MINGW)
-    target_compile_options(${name} PRIVATE 
-        ${REPERTORY_GCC_CXX_FLAGS}
-        ${REPERTORY_GCC_FLAGS}
-    )
-  endif()
-
   target_precompile_headers(${name} PRIVATE include/common.hpp)
 
   if (MACOS)
@@ -34,9 +27,9 @@ function(set_common_target_options name)
   endif()
 
   if (UNIX OR MINGW)
-    target_compile_options(${name} PRIVATE 
-      ${REPERTORY_GCC_CXX_FLAGS}
-      ${REPERTORY_GCC_FLAGS}
+    target_compile_options(${name} PRIVATE
+      $<$<COMPILE_LANGUAGE:CXX>:${REPERTORY_GCC_CXX_FLAGS}>
+      $<$<COMPILE_LANGUAGE:C>:${REPERTORY_GCC_FLAGS}>
     )
   endif()
 endfunction(set_common_target_options)