[libcxx-commits] [libcxx] [llvm] [libc++] Add support for picolibc and newlib in RUNTIMES_USE_LIBC (PR #147956)

[Alexander Richardson via libcxx-commits]

arichardson wrote:

> Thank you for the review @arichardson! There is a way to provide a warning like in this commit [a876988](https://github.com/llvm/llvm-project/commit/a8769880f65faf2abce6bee04b480efd5c0bf571) however I am not sure how many people are actually building with picolibc and will benefit from it.
> 
> I think this is up to maintainers to decide if the warning should be included or not.

Yeah I'm not sure how important this is. I am using the existing implicit support but I can easily update my build scripts.
I think it would be quite nice to detect this at CMake time and give a warning, but probably no need to add the checks in the headers themselves.
IMO this is a question for the libc++ maintainers

https://github.com/llvm/llvm-project/pull/147956