add_to warn_flags -Wexpansion-to-defined
add_to warn_flags -Wimplicit-fallthrough=2
add_to warn_flags -Wmissing-format-attribute
-add_to warn_flags -Wthread-safety
+
+if test "$targetos" != "darwin"; then
+ add_to warn_flags -Wthread-safety
+fi
nowarn_flags=
add_to nowarn_flags -Wno-initializer-overrides