linux-kernel - Re: [PATCH] perf tools: Fix pthread_attr_setaffinity

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Date:	Tue, 24 Feb 2015 09:31:24 -0500
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf tools: Fix pthread_attr_setaffinity_np build error

On Tue, Feb 24, 2015 at 8:52 AM, Adrian Hunter <adrian.hunter@...el.com> wrote:
> On 24/02/15 15:32, Josh Boyer wrote:
>> On Tue, Feb 24, 2015 at 5:46 AM, Adrian Hunter <adrian.hunter@...el.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.

josh
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