[cfe-commits] [PATCH] Warn is -isysroot is given an invalid path

[Chad Rosier]

All,
The attached patch emits a warning in the frontend if the -isysroot flag is given an invalid directory.  I've implemented this using llvm::sys:fs::exists(), but please let me know if FileManager::getStatValue() (or another option) is preferred; I'll modify the patch accordingly.  I'll also add a test case before pushing the final commit.

 Chad

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