Added flag for Thread compatibility

CMakeLists.txt

@@ -29,13 +29,9 @@ else()
   set(time_impl_c src/time_unix.c)
 endif()
 
-if(RCUTILS_NO_FILESYSTEM)
-  add_compile_options(-DRCUTILS_NO_FILESYSTEM=1)
-endif()
-
-if(RCUTILS_AVOID_DYNAMIC_ALLOCATION)
-  add_compile_options(-DRCUTILS_AVOID_DYNAMIC_ALLOCATION=1)
-endif()
+target_compile_definitions(${PROJECT_NAME} PRIVATE "RCUTILS_NO_FILESYSTEM") 
+target_compile_definitions(${PROJECT_NAME} PRIVATE "RCUTILS_NO_THREAD_SUPPORT") 
+target_compile_definitions(${PROJECT_NAME} PRIVATE "RCUTILS_AVOID_DYNAMIC_ALLOCATION") 
 
 configure_file (
     "${PROJECT_SOURCE_DIR}/include/rcutils/error_handling.h.in"

include/rcutils/macros.h

@@ -28,7 +28,9 @@ extern "C"
 
 // Note: this block was migrated from rmw/macros.h
 // This block either sets RCUTILS_THREAD_LOCAL or RCUTILS_THREAD_LOCAL_PTHREAD.
-#if defined _WIN32 || defined __CYGWIN__
+#if RCUTILS_NO_THREAD_SUPPORT
+    #define RCUTILS_THREAD_LOCAL
+#elif defined _WIN32 || defined __CYGWIN__
 // Windows or Cygwin
   #define RCUTILS_THREAD_LOCAL __declspec(thread)
 #elif defined __APPLE__
@@ -57,7 +59,7 @@ extern "C"
   #endif
 #else
 // Some other non-Windows, non-cygwin, non-apple OS
-  #define RCUTILS_THREAD_LOCAL
+  #define RCUTILS_THREAD_LOCAL _Thread_local
 #endif
 
 #define RCUTILS_STRINGIFY_IMPL(x) #x