ARC Flags?

So I have an app template that does not use ARC, and I have to add classes that do.

I heard you can flag those particular files in build phases with " -fno-objc-arc" which I did.

However, XCode will still allow me to write "release" methods and other non-ARC actions to my pro-ARC classes. I'm worryied the compiler is not catching these flags.

Is there a way I can be sure these flags are working?