linux-kernel - Re: [PATCH] perf tools: Fix bison-related build failure on CentOS 6

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Message-ID: <20150429184754.GA2200@redhat.com>
Date:	Wed, 29 Apr 2015 15:47:54 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf tools: Fix bison-related build failure on CentOS 6

Em Wed, Apr 29, 2015 at 08:14:14PM +0200, Jiri Olsa escreveu:
> On Wed, Apr 29, 2015 at 07:57:05PM +0200, Jiri Olsa wrote:
> > On Wed, Apr 29, 2015 at 01:27:40PM -0300, Arnaldo Carvalho de Melo wrote:
> > > > The YYLTYPE_IS_TRIVIAL is defined in the Build file, but unlike
> > > > pmu-bison.c, gcc complained about it for parse-events-bison.c:
> > > > 
> > > >     CC       util/parse-events-bison.o
> > > >   In file included from util/parse-events.y:16:
> > > >   util/parse-events-bison.h:101:1: error: "YYLTYPE_IS_TRIVIAL" redefined
> > > >   <command-line>: error: this is the location of the previous definition
> > > >   make[3]: *** [util/parse-events-bison.o] Error 1
> > > > 
> > > > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > > 
> > > Ok, so this helps, it builds now on RHEL6.6, which was something I and
> > > Jiri were chasing, but why has it complained for one and not the other?
> > > Ideas?
> > 
> > looks like the RHEL6 gcc/cpp treats this as an error which
> > is not maskable by '-w' option
> > 
> > anyway I checked the git log history and I'm not sure
> > why we event have this define, it was added by Ingo
> > and carried by ever since:
> > 
> >   65f3e56e0c81 perf tools: Remove auto-generated bison/flex files
> > 
> > probably because of the fail I see if I remove it from pmu-bison.o build:
> > 
> >   util/pmu-bison.c:613:6: error: "YYLTYPE_IS_TRIVIAL" is not defined
> 
> ok, seem's the patch is right and the reason is the
> parse error handling that was added just recently
> 
> it adds YYLTYPE type (which is not present in pmu-bison.h),
> so YYLTYPE_IS_TRIVIAL gets redefined, which is ok in F20
> that handle the error via '-w' option, but it's not ok for RHEL6
> where the '-w' does not work for this kind of error

Ok, adding this comment to the changelog, together with your Acked-by,
ok?

- Arnaldo
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