[PATCH] D24926: Added support of configuration files

[Serge Pavlov via llvm-commits]

sepavloff created this revision.
sepavloff added a reviewer: rnk.
sepavloff added a subscriber: llvm-commits.

Configuration files store set of options and allow to apply them
in a simple way, - by selection of particular configuration or
automatically.  The implementaion follows the discussion on the mail
list (http://lists.llvm.org/pipermail/cfe-dev/2016-September/050776.html).
This change adds functions for support of this feature into CommandLine
library. Description of the feature can be found in the file
docs/CommandLine.rst changed in this commit.

https://reviews.llvm.org/D24926

Files:
  docs/CommandLine.rst
  include/llvm/Support/CommandLine.h
  lib/Support/CommandLine.cpp
  unittests/Support/CommandLineTest.cpp

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