compile error : about declaration of ‘pthread_attr_setaffinity_np’

[taeung <treeze.taeung@gmail.com>]

Hi, Namhyung

After I pulled new changed source codes from 'perf/core' branch 
(https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git)
,when I compiled perf I've had a problem with error messages as below.

(I'm using as below
system : Ubuntu 14.04.2 LTS 64-bit
kernel version : 3.13.0-40-generic)

==================
taeung ~/git/tip/tools/perf
  :> make -j4

...(omitted)

In file included from bench/futex-hash.c:17:0:
bench/futex.h:73:19: error: conflicting types for 
‘pthread_attr_setaffinity_np’
  static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr,
                    ^
In file included from bench/futex.h:72:0,
                  from bench/futex-hash.c:17:
/usr/include/pthread.h:407:12: note: previous declaration of 
‘pthread_attr_setaffinity_np’ was here
  extern int pthread_attr_setaffinity_np (pthread_attr_t *__attr,
             ^
make[3]: *** [bench/futex-hash.o] Error 1
make[2]: *** [bench] Error 2
make[2]: *** Waiting for unfinished jobs....

...(omitted)

==================

But I modified 'tools/perf/config/feature-checks/Makefile' as Jirka said 
(https://lkml.org/lkml/2015/1/12/216)
so I was able to compile perf.


diff --git a/tools/perf/config/feature-checks/Makefile 
b/tools/perf/config/feature-checks/Makefile
index b32ff33..42ac05a 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) -D_GNU_SOURCE -Werror -lpthread
+       $(BUILD) -Werror -lpthread

  test-stackprotector-all.bin:
         $(BUILD) -Werror -fstack-protector-all


Is this patch right ?


Thanks,
Taeung