[libcxx-commits] [libcxx] [libc++][math] Implement constexpr {round, roundl}. (PR #226377)

[Hristo Hristov via libcxx-commits]

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Zingam wrote:

_LIBCPP_HIDE_FROM_ABI will be removed in the future but it is out of scope here. Also the builtins have to be made constexpr in Clang before any changes to the library can be made.
Basically working on the constexpr  cmath papers requires compiler update first. AFAIK there is an ongoing discussion how to proceed.
You can complete the necessary changes to libc++ + tests but it might take a while before this PR can be landed.

https://github.com/llvm/llvm-project/pull/226377