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Re: [Qemu-devel] [PATCH 1.3] build: compile translate.o at -O1 optimizat


From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH 1.3] build: compile translate.o at -O1 optimization
Date: Tue, 27 Nov 2012 14:45:07 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.11) Gecko/20121116 Thunderbird/10.0.11

On 11/27/12 14:24, Peter Maydell wrote:
> On 27 November 2012 08:34, Paolo Bonzini <address@hidden> wrote:
>> Some versions of GCC require insane (>2GB) amounts of memory
>> to compile translate.o.  As a countermeasure, compile it
>> with -O1.  This should fix the buildbot failure for
>> default_x86_64_fedora16.
> 
> This is a well known bug in old gcc (ie fixed in 4.5, 4.6 and
> trunk a year ago). Use a newer gcc, or a 64 bit build system
> with a reasonable amount of RAM, or as a workaround apply some
> suitable compiler flags by passing configure
> '--extra-cflags=-fno-var-tracking'. This patch definitely
> shouldn't be applied as we shouldn't be hampering the majority
> for the benefit of old broken systems.

It isn't that simple.  It's Fedora 17 with gcc 4.7.2 which runs oom
while compiling translate.c

cheers,
  Gerd




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