linux-kernel - Re: 2.6.19-rc5-mm1 fails to compile with gcc 4.2

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Message-Id: <200611121005.58939.bero@arklinux.org>
Date:	Sun, 12 Nov 2006 10:05:58 +0100
From:	Bernhard Rosenkraenzer <bero@...linux.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: 2.6.19-rc5-mm1 fails to compile with gcc 4.2

On Sunday, 12. November 2006 09:22, Avi Kivity wrote:
> Bernhard Rosenkraenzer wrote:
> > drivers/kvm/kvm_main.c: In function 'kvm_dev_ioctl_run':
> > drivers/kvm/kvm_main.c:153: error: 'asm' operand has impossible
> > constraints drivers/kvm/kvm_main.c:158: error: 'asm' operand has
> > impossible constraints
>
> Smells like a gcc regression.  Can you send .config?
>
> Or better yet, preprocessed source and full gcc command line (as seen on
> 'make V=1').

It does look like a gcc bug -- -O0 makes it go away.
Details at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29808
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