[libcxx-commits] [libcxx] [libc++] Allow the use of extensions in the implementation (PR #79532)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

We discussed it multiple times and this is the end goal we've been driving towards. I think this has the potential to greatly simplify our implementation in places.

However, let's be reasonable and only use these extensions when they are actually useful -- in particular we shouldn't start reimplementing stuff using extensions just because we can, we should only do it when there's a tangible benefit. Let's use our judgement.

https://github.com/llvm/llvm-project/pull/79532