[libcxx-commits] [libcxx] [libc++] Improve the output of the generated-output CI job (PR #68903)

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EricWF wrote:

Thanks for this. That said, we should be checking the diff, not the entire tree. 

I think that until we can get this to stop spuriously failing, it needs to stop breaking the CI. Can we also turn this to not block the remainder of the checks?

It's not clear to me that this should even be a blocking check (it certainly didn't block the broken change from getting checked in.

https://github.com/llvm/llvm-project/pull/68903