What would it take to have this work merged in with regular Clang?

[mstewartgallus]

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[tpoechtrager]

Yes, the best would be indeed to have the header search logic merged into the clang driver code, but don't expect it to happen too soon.

It would probably also require to have this: http://llvm.org/bugs/show_bug.cgi?id=18546 merged first.