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

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Message-ID: <20120504031614.GA12048@kroah.com>
Date:	Thu, 3 May 2012 20:16:14 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	David Miller <davem@...emloft.net>, namhyung.kim@....com,
	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...stprotocols.net, jolsa@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: perf build failure on Linus's tree

On Thu, May 03, 2012 at 11:01:54PM -0400, Arnaud Lacombe wrote:
> Hi,
> 
> On Thu, May 3, 2012 at 10:47 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> > On Thu, May 03, 2012 at 10:35:02PM -0400, Arnaud Lacombe wrote:
> >> Hi,
> >>
> >> On Thu, May 3, 2012 at 10:29 PM, Arnaud Lacombe <lacombar@...il.com> wrote:
> >> > [...]
> >> > [0]: http://pkgs.fedoraproject.org/gitweb/?p=flex.git;a=blob;f=flex-2.5.35-hardening.patch;h=7d608ea2371fa3295bdb8eb97c15eeb03029c02b;hb=HEAD
> >> >
> >> as a side note, this patch sounds more being about "silencing" than
> >> "hardening"...
> >
> > That's nice, but I can build the perf version in 3.3 just fine, so
> > something broke here (hint, build regression.)  Do I have to bisect it
> > down to find the problem?
> >
> there is most likely nothing to bisect, `perf' seems to have never
> required any parser before 3.4. The way the rest of the tools
> (especially `kconfig', `genksyms' and `dtc') manage parsers is via
> pre-generated .[ch]_shipped version of the lexer/tokenizer. It's been
> working well for a long time as such. `perf' will certainly have to
> follow the same path.

Well, it can allow bison to run, but just don't break the build if the
generated code it creates happens to contain warnings.

I'm using bison 2.5 and flex 2.5.35, and my phone number is...

Like this really matters?  This needs to work for everyone, if not, you
better put the specific version numbers you need to require in the
Documentation/Changes file.

So, how do I fix this?

greg k-h
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