linux-kernel - Re: [patch] perf build questions

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Date:	Tue, 6 Oct 2009 14:05:51 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	lkml <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch] perf build questions

On Tue, Oct 06, 2009 at 10:26:26AM -0700, Randy Dunlap wrote:
> $ make NO_64BIT=1 all
> $ file perf
> perf: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), for GNU/Linux 2.6.4, dynamically linked (uses shared libs), not stripped
> 
> 
> Shouldn't that be a 32-bit executable for i386?
> Am I confused?  (you don't have to answer that)
> 

Are you running a 32-bit userspace, with x86_64 kernel? Or running
x86_64 userspace as well and trying to crossbuild for i386? In the
latter case NO_64BIT won't do what you hope, it's to avoid trying to
build a 64-bit binary in the former case.

You could force -m32 into CFLAGS in the second case, but unless you have
the proper i386 bi-arch toolchain installed (glibc, etc.) it likely
won't build...

regards, Kyle
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