[PATCH] Mingw-w64 driver for clang

[Yaron Keren]

For interactive work I prefer to change path since typing gcc at the command line finds the same one clang would find.

Anyhow, no problem, here is the patch with --sysroot support. If --sysroot is provided it is the base directory for gcc root. If not, clang will look for gcc in the path as the previous version. The changes are in MinGW constructor.


http://reviews.llvm.org/D5268

Files:
  tools/clang/include/clang/Driver/Options.td
  tools/clang/lib/Driver/CMakeLists.txt
  tools/clang/lib/Driver/Driver.cpp
  tools/clang/lib/Driver/MinGWToolChain.cpp
  tools/clang/lib/Driver/ToolChains.h
  tools/clang/lib/Driver/Tools.cpp
  tools/clang/lib/Driver/Tools.h
  tools/clang/lib/Frontend/InitHeaderSearch.cpp

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