Egor Zhdan f42609b7bd [cxx-interop][SwiftToCxx] Do not crash while trying to expose a macro to C++ ...

This fixes a compiler crash that happened when emitting a Clang header for a Swift module that declares multiple macros with the same base name and different argument names.

Swift macros are not currently designed to be exposed to C++. This teaches the compiler to explicitly mark them as unavailable in C++.

rdar://117969472 / resolves https://github.com/apple/swift/issues/69656

2024-05-08 16:08:02 +01:00

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