[libcxx-commits] [libcxxabi] [libunwind] [libcxxabi][libunwind] Support for using LLVM libc (PR #101688)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> @ldionne I'm starting to think that we should have a generic module in https://github.com/llvm/llvm-project/tree/main/cmake/Modules that would be controlled by `LLVM_USE_LIBC` and define `libc-headers`, `libc-static` and `libc-shared`. That way we could avoid duplicating this logic in every subproject. What do you think?

I agree, but I might put it in `runtimes/cmake/Modules` where we already have some stuff. I also wonder if we want to use  `LLVM_USE_LIBC` or `RUNTIMES_USE_LIBC` or something else. Historically, `LLVM_FOO` settings are mostly things that we've inherited from `<monorepo>/llvm/CMakeLists.txt` and tried to move away from.

https://github.com/llvm/llvm-project/pull/101688