linux-kernel - Re: perf build failure on Linus's tree

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Message-Id: <20120503.215020.954262287222794218.davem@davemloft.net>
Date:	Thu, 03 May 2012 21:50:20 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	namhyung.kim@....com
Cc:	gregkh@...uxfoundation.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, mingo@...hat.com, acme@...stprotocols.net,
	jolsa@...hat.com, lacombar@...il.com, linux-kernel@...r.kernel.org
Subject: Re: perf build failure on Linus's tree

From: Namhyung Kim <namhyung.kim@....com>
Date: Fri, 04 May 2012 10:37:24 +0900

> Hi,
> 
> On Thu, 3 May 2012 14:57:48 -0700, Greg KH wrote:
>> Linus's tree right now (3.4.rc5.67.gac001.dirty) gives me the following
>> build error when I try to build perf:
>>     CC util/parse-events-flex.o
>> <stdout>: In function ‘yy_get_next_buffer’:
>> <stdout>:1510:3: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
>> util/parse-events.l: In function ‘parse_events_lex’:
>> util/parse-events.l:122:1: error: ignoring return value of ‘fwrite’, declared with attribute warn_unused_result [-Werror=unused-result]
>> cc1: all warnings being treated as errors
>>
>> Do you really want to ensure that flex's build warnings fail the build?
>>
>> thanks,
>>
>> greg k-h
> 
> Can't reproduce it on my Fedora 17 box:

Because your glibc headers probably don't have the warn_unused_result attribute
in the extern declaration of fwrite() like Greg's do.