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I think the title explains my question pretty well, I’m currently working on a small framework for my personal needs, and thought about building it with ARC (if thats possible at all?), and use it in old projects that were built before ARC?
Yes, with one caveat: if you have iOS 4.x as a deployment target, a supplemental library is necessary to deal with ARC-compiled code on the older runtime. For an application built using ARC, this is packaged in with the application. This is not included if you are using an ARC-compiled library in a non-ARC application.
You can manually link this library into your non-ARC application to avoid runtime problems on the older OS versions by adding
-fobjc-arcto your Other Linker Flags for the application.See this Apple Developer Forums thread for some more discussion on this.