[PATCH] D23816: clang-cl: Add support for /FC: absolute paths in diagnostics and __FILE__

[Hans Wennborg via cfe-commits]

hans created this revision.
hans added reviewers: thakis, rsmith.
hans added a subscriber: cfe-commits.

 It turns out several Chromium developers rely on this on Windows.

I'm not sure about the internal flag name. And do we want to expose this in non-cl mode too?

https://reviews.llvm.org/D23816

Files:
  include/clang/Basic/FileSystemOptions.h
  include/clang/Driver/CC1Options.td
  include/clang/Driver/CLCompatOptions.td
  lib/Basic/FileManager.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Driver/cl-options.c
  test/Frontend/Inputs/absolute-paths.h
  test/Frontend/absolute-paths.c

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