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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@fedoraproject.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com> Link: http://lkml.kernel.org/r/20150211162404.GA15522@hansolo.redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -49,7 +49,7 @@ test-hello.bin:
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$(BUILD)
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test-pthread-attr-setaffinity-np.bin:
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$(BUILD) -Werror -lpthread
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$(BUILD) -D_GNU_SOURCE -Werror -lpthread
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test-stackprotector-all.bin:
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$(BUILD) -Werror -fstack-protector-all
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