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SubjectRe: perf build failure on Linus's tree
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From: Namhyung Kim <namhyung.kim@lge.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.
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