Summary:
Some custom toolchains come with their own header files and compiler
drivers. Those compiler drivers implicitly know about include search path for
those headers. This patch aims to extract that information from drivers and add
it to the command line when invoking clang frontend.
Reviewers: sammccall
Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D62804
llvm-svn: 364389
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