ci: Try to fix macOS runner

[emilio]

Now seems to run on arm64 out of the blue...

[pvdrz]

It seems we're both trying to fix it: #2820 🤣

i believe this happens because llvm was built with a different xcode version or something. However, I think we're just being affected by this: actions/runner#3256.

I also considered installing LLVM 9 on apple's arm but it seems the only prebuilt version can be installed via macports.

I think there's not much we can do regarding LLVM 9 on macos to be honest, specially if apple decides to drop x86 support eventually

[emilio]

I think there's not much we can do regarding LLVM 9 on macos to be honest, specially if apple decides to drop x86 support eventually

Yeah, that's why I approached this by trying to test in a new-ish llvm version... I think part of the issue is that somehow quote and co are using cc as a linker, rather than the LLVM we just downloaded...

[emilio]

But even with that fixed it fails so nvm...

[leighmcculloch]

Now seems to run on arm64 out of the blue...

According to this post by GitHub in January the macos-14 runner is exclusively arm64 and macos-latest was slated to update to 14 in April+:

• https://github.blog/changelog/2024-01-30-github-actions-macos-14-sonoma-is-now-available/

This definitely landed in a way that was surprising though.

[emilio]

@pvdrz apparently macos-latest was macos-12, not macos-13, so downgrading to that fixes CI.