[PATCH] D24933: Enable configuration files in clang

[Serge Pavlov via cfe-commits]

sepavloff updated this revision to Diff 78167.
sepavloff added a comment.

Limit the patch by named configuration files only

Follow advice of @mgorny and removed all features from the patch except
named config files. These are files specified explicitly by option
`--config` or encoded in executable name, such as `armv7l-clang`. This
kind of configuration files did not cause objections except that "this
functionality is already available with `@file`". In contrast to `@file`
configuration files have advantages:

- they is searched in well-known places rather than in current directory,
- they may contain comments,
- they may include other files by `@file` and these files are resolved relative to the including file.
- they may be encoded in executable name; such encoding is already used by clang to specify targets.

Also added section about config files to the user manual.


https://reviews.llvm.org/D24933

Files:
  docs/UsersManual.rst
  include/clang/Driver/Driver.h
  lib/Driver/Driver.cpp
  test/Driver/Inputs/config-1.cfg
  test/Driver/Inputs/config-2.cfg
  test/Driver/config-file.c
  tools/driver/driver.cpp

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