Re: [PATCH] perf tools: Fix pthread_attr_setaffinity_np build error

[Adrian Hunter <adrian.hunter@intel.com>]

On 24/02/2015 4:31 p.m., Josh Boyer wrote:
> On Tue, Feb 24, 2015 at 8:52 AM, Adrian Hunter <adrian.hunter@intel.com> wrote:
>> On 24/02/15 15:32, Josh Boyer wrote:
>>> On Tue, Feb 24, 2015 at 5:46 AM, Adrian Hunter <adrian.hunter@intel.com> wrote:
>>>> Feature detection for pthread_attr_setaffinity_np was failing,
>>>> producing this error:
>>>>
>>>> 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....
>>>>
>>>> This was because compiling test-pthread-attr-setaffinity-np.c
>>>> failed due to the function arguments:
>>>>
>>>> test-pthread-attr-setaffinity-np.c: In function 'main':
>>>> test-pthread-attr-setaffinity-np.c:11:2: warning: null argument where non-null required (argument 3) [-Wnonnull]
>>>>    ret = pthread_attr_setaffinity_np(&thread_attr, 0, NULL);
>>>>    ^
>>>> So fix the arguments.
>>>
>>> Erm, I sent a different fix for this a while ago.  It's queued in some
>>> -tip tree.  The feature test wasn't defining _GNU_SOURCE, which is
>>> required for pthread_attr_setaffinity_np.  Once that was set (passed
>>> via -D in the Makefile), the feature test worked fine.
>>>
>>> Did you have to use your patch on top of the fix already queued?
>>
>> Yes.
>>
>> The error (warning + Werror) I got definitely seemed to be about the use of
>> NULL as an argument.
>
> Hm, ok.  Which compiler/glibc are you using?  Curious that I'm not
> seeing that issue.

4.8.2

You could also see if you have the __nonnull attribute in the header e.g.

extern int pthread_attr_setaffinity_np (pthread_attr_t *__attr,
                                         size_t __cpusetsize,
                                         const cpu_set_t *__cpuset)
      __THROW __nonnull ((1, 3));