[PATCH] D159483: [Modules] Add a flag to control builtin headers being in system modules

[Ben Langmuir via Phabricator via cfe-commits]

benlangmuir added a comment.

>> How does this work today? Wouldn't the include guard prevent this?
>
> Today they don't define their include guard when building with modules.

Thanks - I can see some headers behave that way, or in other cases there are other sorts of has_feature(modules) checks that I can see you're modifying, but what about all the *va_* headers that currently just seem to have normal header guards?


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https://reviews.llvm.org/D159483