[libcxx-commits] [libcxx] [libc++][modules] Modularize <cstddef> (PR #107254)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> Is there a reason we wouldn't instead just include `<stddef.h>` instread of `<cstddef>`?

Because that defines `::size_t`, not `std::size_t`. We still need a canonical place to define `std::size_t` and that's also a problem that `__cstddef/size_t.h` solves. Additionally, this patch provides a path towards defining `std::size_t` in libc++ itself without relying on `stddef.h` in the future, which could be nice to reduce our dependency on a base C standard library.

https://github.com/llvm/llvm-project/pull/107254