[PATCH] D23454: [Driver] Set the default clang driver mode based on the executable

[Zachary Turner via cfe-commits]

zturner created this revision.
zturner added a reviewer: rnk.
zturner added a subscriber: cfe-commits.

If `--driver-mode` is passed in one or more times, it will overwrite the default by this patch.  This patch only makes it so that if NO `--driver-mode` is passed in, we try to do better than saying "must be GCC".

This is one of two steps necessary to get clang-tidy working on Windows.  However, despite that, this change seems correct even in the general sense.  If a `--driver-mode` option is not passed in, we should make the most informed possible decision we can.

https://reviews.llvm.org/D23454

Files:
  include/clang/Driver/Driver.h
  lib/Driver/Driver.cpp
  unittests/Driver/ToolChainTest.cpp

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