linux-kernel - Re: tools/perf compile error: ignoring return value of 'read', declared with attribute warn_unused

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Date:	Thu, 02 Jul 2009 20:49:35 -0300
From:	Kevin Winchester <kjwinchester@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frédéric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: tools/perf compile error: ignoring return value of 'read', declared
 with attribute warn_unused_result

Ingo Molnar wrote:
> * Kevin Winchester <kjwinchester@...il.com> wrote:
> 
>>     CC builtin-stat.o
>> cc1: warnings being treated as errors
>> builtin-stat.c: In function 'run_perf_stat':
>> builtin-stat.c:243: error: ignoring return value of 'read', declared with attribute warn_unused_result
>> builtin-stat.c:256: error: ignoring return value of 'read', declared with attribute warn_unused_result
>> make: *** [builtin-stat.o] Error 1
>>
>> Apparently my version of gcc and/or glibc do not agree with -Werror.  Would the fix be as simple as:
>>
>>     if *read(go_pipe[0], &buf, 1) < 0) {
>>             perror("Failed to read go_pipe.");
>>             exit(1);
>>     }
>>
>> ?
> 
> Yeah, that's Ubuntu doing some must-check-warnings via headers, 
> right?
> 
> Frederic fixed a bug there yesterday - mind checking the latest 
> perfcounters code at:
> 
>   http://people.redhat.com/mingo/tip.git/README
> 
> ?
> 

It's Gentoo, actually, but likely the same issue.  I checked tip/master and it does not show the problem.

Thanks for taking the time to look into it,

-- 
Kevin Winchester
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