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

[Ian Anderson via Phabricator via cfe-commits]

iana added a comment.

In D159483#4641231 <https://reviews.llvm.org/D159483#4641231>, @benlangmuir wrote:

>> but need to be repeatedly included when they're used in system modules
>
> How does this work today? Wouldn't the include guard prevent this?

Today they don't define their include guard when building with modules.


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https://reviews.llvm.org/D159483