From: Ingo Molnar <mingo@kernel.org>
Date: Mon, 30 Sep 2013 11:51:28 +0000 (+0200)
Subject: tools/perf/build: Add 'autodep' functionality, generate feature test dependencies... 
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~41^2~28^2~158
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b6eb56a9570001634df1d2c7f38e7179a357362;p=pandora-kernel.git

tools/perf/build: Add 'autodep' functionality, generate feature test dependencies automatically

Use GCC's -MD feature to generate a dependency file for each feature test .c file,
and include that .d file in the config/feature-checks/Makefile.

This allows us to do two things:

 - speed up feature tests
 - detect removal or changes in build dependencies - including system libraries/headers

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-Jfma8pmPnnqzpxjbs3hpgmsj@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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