[libcxx-commits] [libcxx] [libc++] Simplify the __libcpp_refstring implementation (PR #166344)

[Nikolas Klauser via libcxx-commits]

philnik777 wrote:

> On macOS, we don't support building new code against libstdc++ anymore. However, for backwards compatibility with apps that have already been built a long time ago, we do provide `libstdc++.dylib` in the dyld shared cache.
> 
> I aslo did a search and I did find some applications available for download on the App Store which reference some symbols from libstdc++. Hence, I think we need to keep this old code, sadly 🙁

Is this available on intel based systems only, or is it also available on the arm versions of macOS? Is it still required for iOS? I'd really like to constrain this as much as possible, so we know if/when we can drop this.

https://github.com/llvm/llvm-project/pull/166344