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

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Date:	Fri, 04 May 2012 10:37:24 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Greg KH <gregkh@...uxfoundation.org>
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

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?

Thanks,
Namhyung
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