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

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Date:	Thu, 3 May 2012 18:41:20 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Namhyung Kim <namhyung.kim@....com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jiri Olsa <jolsa@...hat.com>,
	Arnaud Lacombe <lacombar@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: perf build failure on Linus's tree

On Fri, May 04, 2012 at 10:37:24AM +0900, Namhyung Kim wrote:
> 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:
> 
> namhyung@...ong:perf$ make
> PERF_VERSION = 3.4.rc5.67.gac001
>     GEN common-cmds.h
>     * new build flags or prefix
>     CC perf.o
>     CC builtin-annotate.o
>     CC builtin-bench.o
>     CC bench/sched-messaging.o
>     CC bench/sched-pipe.o
> [SNIP]
>     CC util/trace-event-parse.o
>     CC util/parse-events-flex.o
>     CC util/parse-events-bison.o
>     CC util/pmu-flex.o
>     CC util/pmu-bison.o
> [SNIP]
>     CC util/scripting-engines/trace-event-python.o
>     CC scripts/python/Perf-Trace-Util/Context.o
>     AR libperf.a
>     LINK perf
>     GEN perf-archive
>     GEN python/perf.so
> 
> 
> What are versions of tools you are using?

gcc 4.6.2 from openSUSE 12.1.
Any other tools you want to know the version of?

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