[libcxx-commits] [libcxx] [libc++][math] Add `constexpr` to `copysign`, `copysignf`, `copysignl` (PR #216285)

[Lucas Mellone via libcxx-commits]

lknknm wrote:

> Sure. FWIW I'm pretty sure the only thing we need is for Clang to accept the current math builtins during constant evaluation in C++20 and from there we can implement the papers.

I really don't understand what do you mean here. Check `__builtin_copysign` for example, they are already enabled for constant evaluation as far as I can tell...

https://github.com/llvm/llvm-project/pull/216285