[libcxx-commits] [libcxx] [libc++] stddef.h needs to #include_next for the new clang __need_ macros (PR #86252)

[Ian Anderson via libcxx-commits]

ian-twilightcoder wrote:

> These macros are obscure. I would, in fact, much rather remove any knowledge of `__need_` macros from our headers.

I guess we could try removing the macros and the header guard and just always include_next. That feels like a riskier change for llvm 18 though.

https://github.com/llvm/llvm-project/pull/86252