[cfe-commits] [PATCH] Make ClangTool chdir into the compilation directory

[Manuel Klimek]

As -working-directory only affects the build inputs, not the include
files, we need to chdir into the correct directory to resolve relative
paths.

Main non-obvious point for review: is chdir() portable enough, or do I
need a different way? I looked through llvm's Support directory but
didn't find anything.

Cheers,
/Manuel
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