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I’ve removed a function from my Objective-C source code and now the linker complains that there’s an undefined symbol referenced in CacheMgrViewController.o. I’ve tried cleaning the project. I’ve tried deleting the derived data. Nothing works. What else do I need to do???
It sounds like you have deleted the definition of the C function, but you’re still actually calling it from something in or included by CacheMgrViewController.m (or CacheMgrViewController.mm).
A declaration of the definition you had deleted may still exist, or you may have not seen the warning about calling an implicit function (assuming that warning is enabled).
Resolution: Just do a project search for the function name that the linker cannot find and delete any uses of the function (that was your intent by deleting it, yes?).