[libcxx-commits] [libcxx] [libc++] Add a utility for checking the output of commands (PR #65917)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> I'm not OK importing our own version of an LLVM tool that we should just use if we need it. Also, reading the tests you added with the change look like they won't last more than one version before they start failing.

One challenge with using `FileCheck` is that it depends on the rest of LLVM, so we need to basically build it first. This has been a major blocker for us to do this in the past. Perhaps we could investigate shipping `FileCheck` with LLVM such that we can use the apt-get installed version in the Docker image.


https://github.com/llvm/llvm-project/pull/65917