[libc-commits] [libc] [libc] Update libc_errno to work correctly in both overlay and full build modes. (PR #80177)

[Joseph Huber via libc-commits]

https://github.com/jhuber6 approved this pull request.

This has the effect of making the GPU `errno` externally visible. I remember some discussions with Siva about that. I don't think it will be a huge issue, at least not righ right now. Though most of the GPU implementations of `stdio` stuff intentionally ignored errno so it won't be consistent in any case. FWIW I think a global config to ignore errno might be valuable, even if it's against the standard.

https://github.com/llvm/llvm-project/pull/80177