Arnold Schwaighofer 086bc944f0 IRGen: Only use clang protocol emission on newer deployment targets ...

We started using clang to emit the _OBJC_PROTOCOL_ definition.

But we would use a different name for the proto_list definition than clang.

"OBJC_LABEL_PROTOCOL$" (objc)
|--> OBJC_PROTOCOL
"\01l_OBJC_LABEL_PROTOCOL$_" (swift)
|--> OBJC_PROTOCOL

If an Objective C object also emitted the same protocol definition you could
end up in a situation where both clang's and swift's proto_list definitions
point to the same protocol definition.

Older linkers don't like that.

rdar://108505376

2023-05-01 13:49:17 -07:00

1.1 KiB

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