Slava Pestov 8ecb83e29a Sema: Diagnose unsupported '@objc' on classes and members of extensions of classes with resilient ancestry ...

Unless -enable-resilient-objc-class-stubs is passed in, these cases
are not supported, so now we diagnose them instead of asserting or
failing to link.

Note the behavior change here; classes with resilient ancestry were
previously isObjC(). However this is wrong since isObjC() means
"statically visible to Objective-C via the generated header".

After this patch, isObjC() only returns true for a class with resilient
ancestry if -enable-resilient-objc-class-stubs is passed in.

2019-03-26 18:58:12 -04:00

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