Are Xcode build settings exposed as pre-processor variables? I know
they're available when pre-processing Info.plists, but can't find a
way to use them in source code files (.m).
I ask because it could be great if you could do something like this:
#ifdef OBJC_GC
#error This code doesn't support garbage collection
#endif
on a per-file basis. For example, you might have an app designed as GC-
only, but have a few files you've updated from r/r. Then attempting to
compile as GC-supported should throw an error for the GC-only code.
Jonathon Mah
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