iana added a comment.

A big assumption this patch makes is that `ModuleMap::isBuiltinHeader` is 
primarily to support Apple's unfortunate module needs. Thus this patch turns 
that behavior off by default, which makes things work the way one would expect. 
That is, when usr/include/module.modulemap references stdint.h, that just means 
usr/include/stdint.h and it doesn't also pull in the clang builtin stdint.h, it 
doesn't transform usr/include/stdint.h into a textual header, etc. I'm hoping 
that's acceptable behavior on non-Apple platforms, but if someone knows 
otherwise please let me know and we can rethink how the option should be 
defined and set.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D159483/new/

https://reviews.llvm.org/D159483

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