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

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Message-Id: <1BA58C04-16BE-4EEA-AD24-20C4089DA0BF@kernel.crashing.org>
Date:	Sun, 12 Nov 2006 12:17:55 +0100
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Bernhard Rosenkraenzer <bero@...linux.org>
Cc:	Avi Kivity <avi@...ranet.com>, linux-kernel@...r.kernel.org,
	akpm@...l.org
Subject: Re: 2.6.19-rc5-mm1 fails to compile with gcc 4.2

>>> 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').

Just the function containing those lines (please mark which
lines they are) would do probably.

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

PR29808 is not a GCC bug, but invalid code.


Segher

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