linux-kernel - [tip:perf/core] tools/perf/build: Add 'autodep' functionality, generate feature test dependencies automatically

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Message-ID: <tip-8b6eb56a9570001634df1d2c7f38e7179a357362@git.kernel.org>
Date:	Mon, 14 Oct 2013 22:12:50 -0700
From:	tip-bot for Ingo Molnar <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, namhyung@...nel.org,
	jolsa@...hat.com, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] tools/perf/build: Add 'autodep' functionality,
  generate feature test dependencies automatically

Commit-ID:  8b6eb56a9570001634df1d2c7f38e7179a357362
Gitweb:     http://git.kernel.org/tip/8b6eb56a9570001634df1d2c7f38e7179a357362
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Mon, 30 Sep 2013 13:51:28 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 9 Oct 2013 08:48:29 +0200

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@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/n/tip-Jfma8pmPnnqzpxjbs3hpgmsj@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/perf/config/feature-checks/Makefile | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index b3f6372..4708cca 100644
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -1,16 +1,20 @@
 
 FILES=test-hello
 
+CC := $(CC) -MD
+
 all: $(FILES)
 
 BUILD = $(CC) -o $(OUTPUT)$@ $@.c
 
 ###############################
 
-test-hello: test-hello.c
+test-hello:
 	$(BUILD)
 
+-include *.d */*.d
+
 ###############################
 
 clean:
-	rm -f $(FILES)
+	rm -f $(FILES) *.d
--
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