[libcxx-commits] [libcxx] [libc++] Enable availability based on the compiler instead of __has_extension (PR #84065)

[Nikolas Klauser via libcxx-commits]

philnik777 wrote:

I feel like we should fix this in Clang rather than in libc++. I think this behaviour is really surprising to people. CC @AaronBallman 

https://github.com/llvm/llvm-project/pull/84065