linux-kernel - Re: [tip:perf/urgent] perf tools: Fix the NO

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Date:	Wed, 14 Oct 2009 08:20:52 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Randy Dunlap <randy.dunlap@...CLE.COM>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	paulus@...ba.org, acme@...hat.com, a.p.zijlstra@...llo.nl,
	efault@....de, fweisbec@...il.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf tools: Fix the NO_64BIT build on pure
	64-bit systems


* Randy Dunlap <randy.dunlap@...CLE.COM> wrote:

> On Mon, 12 Oct 2009 08:34:16 GMT tip-bot for Ingo Molnar wrote:
> 
> > Commit-ID:  55621ccf2b7a8afe39df8c80f55b28424fd07d13
> > Gitweb:     http://git.kernel.org/tip/55621ccf2b7a8afe39df8c80f55b28424fd07d13
> > Author:     Ingo Molnar <mingo@...e.hu>
> > AuthorDate: Mon, 12 Oct 2009 09:57:25 +0200
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Mon, 12 Oct 2009 10:00:27 +0200
> > 
> > perf tools: Fix the NO_64BIT build on pure 64-bit systems
> > 
> > Randy Dunlap reported that 'make NO_64BIT=1' fails to build
> > a pure 32-b it binary on 64-bit/64-bit x86 systems.
> > 
> > The reason is that we dont pass in the -m32 and GCC defaults
> > to -m64.
> > 
> > So pass it in - and also extend the warning message about libelf
> > dependencies - glibc-dev[el] is needed as well beyond the libelf
> > library.
> 
> Ingo, thanks, I finally got this working, after installing more 32-bit
> libs etc., like Kyle said that I would need to do.
> 
> The error message is still a little misleading/confusing:
> Makefile:426: *** No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel and glibc-dev[el].  Stop.
> 
> when elfutils-libelf-devel.i586 is installed but glibc-devel.i[56]86 is not
> installed.  gcc failed with:
> In file included from /usr/include/features.h:376,
>                  from /usr/include/sys/types.h:27,
>                  from /usr/include/libelf.h:53,
>                  from elfdeveltest.c:1:
> /usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h: No such file or directory

Why is it misleading? It says it very clearly that you need to install 
both:

  please install libelf-dev/elfutils-libelf-devel and glibc-dev[el].  Stop.

	Ingo
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