已知 cmake 编译的情况有鸿蒙平台的预定义宏 __OHOS__，gn 编译有类似的HarmonyOS的预定义宏吗？

+is_ohos = current_os == “ohos”
is_android = current_os == “android”
is_chromeos = current_os == “chromeos”
is_fuchsia = current_os == “fuchsia”
@@ -373,6 +376,10 @@ if (is_android) {
[ “//build/config/android:default_orderfile_instrumentation” ]
}
+if (is_ohos) {
default_compiler_configs += [ “//build/config/ohos:compiler” ]
+}