[libcxx-commits] [libcxx] [llvm] [libc++] Optionally support filecheck and split-file (PR #165769)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> Quick question: what is the recommended workflow to update/generate such tests in libcxx? Can I use update_cc_test_checks.py in the same way that I would use in the CodeGen/CodeGenCXX tests?

I'm not familiar with `update_cc_test_checks.py`. At the moment the intent is that these tests are pretty rare and they are only used to check things that are very difficult to test otherwise, such as some optimizations. For everything else, we'd still use normal runtime tests.

I'll merge this since it's blocking other work and reviewers were fine with the previous version, which was strictly worse.

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