ldionne added a comment.

In D91311#2417293 <https://reviews.llvm.org/D91311#2417293>, @rsmith wrote:

> In D91311#2416940 <https://reviews.llvm.org/D91311#2416940>, @ldionne wrote:
>
>> LGTM from the libc++ point of view. The CI is passing -- those failures are 
>> flaky modules tests that we need to fix.
>
> Perhaps we need to specify `-fmodules-validate-system-headers` in the test so 
> Clang doesn't assume that system headers are unchanged?

Oh, would that be it? We're not including libc++ headers as system headers when 
running the tests, though (and we're disabling the system header pragma). Do 
you think that might still be the issue?

I tried a dumb workaround with D92131 <https://reviews.llvm.org/D92131>, but 
it's arguably not great. I'd love to have your thoughts on that. We've been 
seeing these issues for a while when we make some types of changes in the 
`__config_site`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91311/new/

https://reviews.llvm.org/D91311

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