joerg added a subscriber: joerg.
joerg added a comment.

I've added functionality like that to NetBSD's GCC 
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47047> a long time ago. That 
functionality is useful for a variety of situations, cutting down file space or 
canonicalization are two uses.


http://reviews.llvm.org/D17741



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