[libcxx] [llvm] [libc++] Optionally support filecheck-based tests (PR #165769)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> If a user wants to set up FileCheck locally to work on libc++, they shouldn't have to configure LLVM and build it. It's a fragile and complicated process.

Can you elaborate on why this process is fragile? I don't think configuring LLVM/building FileCheck should be more fragile than building libc++.

> If we productized FileCheck into something standalone that can be installed with e.g. Homebrew, I'd much prefer use the LLVM version. But since I don't see that happening, I think it makes more sense to use an easily installable equivalent of it.

I don't think this would be too difficult to do. We could even make it installable via pip.

https://github.com/llvm/llvm-project/pull/165769