linux-kernel - [PATCH] perf tools: Define _GNU_SOURCE on pthread_attr_setaffinity

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Date:	Wed, 11 Feb 2015 11:24:05 -0500
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] perf tools: Define _GNU_SOURCE on
 pthread_attr_setaffinity_np feature check

The man page for pthread_attr_set_affinity_np states that _GNU_SOURCE must
be defined before pthread.h is included in order to get the proper function
declaration.  Define this in the Makefile.

Without this defined, the feature check fails on a Fedora system with gcc5
and then the perf build later fails with conflicting prototypes for the
function.

Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>
---
 tools/perf/config/feature-checks/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Full logs at:
http://koji.fedoraproject.org/koji/getfile?taskID=8895543&name=build.log

diff --git a/tools/perf/config/feature-checks/Makefile b/tools/perf/config/feature-checks/Makefile
index 42ac05aaf8ac..b32ff3372514 100644
--- a/tools/perf/config/feature-checks/Makefile
+++ b/tools/perf/config/feature-checks/Makefile
@@ -49,7 +49,7 @@ test-hello.bin:
 	$(BUILD)
 
 test-pthread-attr-setaffinity-np.bin:
-	$(BUILD) -Werror -lpthread
+	$(BUILD) -D_GNU_SOURCE -Werror -lpthread
 
 test-stackprotector-all.bin:
 	$(BUILD) -Werror -fstack-protector-all
-- 
2.1.0

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