Compiled libraries will work with ARC out of the box. All ARC automatically adds memory management. It will add save, releases, etc. If the code has already been compiled, it will contain the necessary memory management, regardless of whether it was compiled using ARC or not.
If you add third-party code directly to your application, you need to make sure that the code works with ARC, but you do not need to change anything for compiled libraries and frameworks.
Apple is pushing ARC as the way forward, so for a new project, I don't think there should be any problems with it.
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