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I have been refraining from upgrading Xcode until one specific project is out of the way, which is coming soon. I would like to be able to use ARC for future projects while keeping the ability to maintain and investigate issues with prior software products.
Question is can this be done with a single install of Xcode ? When I upgrade Xcode, will I be able to exclude ARC completely from some projects, and continue working without changing anything in those projects?
Yes. ARC is a build option for each project, or can even be enabled/disabled per-file.