[PATCH] Add clang-format config to contrib folder

[Markus Trippelsdorf]

On 2015.11.18 at 15:10 +0100, Martin Liška wrote:
> Hello.
> 
> Following patch adds a clang-format config file that should respect the GNU coding standards.
> As the file is not part of build process, I hope the patch can be applied even though
> we've just skipped to stage3? The patch adds a hunk to Makefile which can create symlink
> to the root directory of the GCC compiler. The clang-format automatically loads style from
> the configuration file. 
> 
> clang-format (version 3.8) provides rich variety of configuration options that can
> ensure the GNU coding style.
> 
> Limitations:
> + placement of opening brace of an initializer can't be requested
> + sometimes, '(' is the trailing symbol at the end of a line, which can look weird
> 
> As we've been continuously converting our source base to C++, the clang-format should
> provide better results than a collection of regular expressions (check_GNU_style.sh).
> 
> As a reference file I attach gcc/tree-ssa-uninit.c file.
> Feel free to comment the suggested configuration file.

Thanks for doing this. It works fine except one problem: You should
delete "SortIncludes: false" from the contrib/clang-format file, because
it is the default for custom styles and doesn't work in .clang-format
(it is a command line option instead):

markus@x4 gcc % clang-format -style=file gcc-main.c
YAML:47:15: error: unknown key 'SortIncludes'

Otherwise it looks good to me.

-- 
Markus