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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

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

Full logs at:

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) -Werror -lpthread
+ $(BUILD) -D_GNU_SOURCE -Werror -lpthread

$(BUILD) -Werror -fstack-protector-all

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