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[Qemu-devel] Re: git commit c832e3de chokes gcc-4.5.2 (out of memory err

From: walt
Subject: [Qemu-devel] Re: git commit c832e3de chokes gcc-4.5.2 (out of memory error)
Date: Sat, 19 Mar 2011 09:06:31 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:2.0b13pre) Gecko/20110317 Thunderbird/3.3a3

On 03/18/2011 03:44 PM, Peter Maydell wrote:
On 18 March 2011 23:31, walt<address@hidden>  wrote:
The following commit has a strange side-effect on gcc-4.5.2:
The new code in 'target-i386/translate.c' compiles just fine with gcc-4.4.4,
using less than 1GB of RAM, but gcc-4.5.2 uses the whole GB and then fills
up 2GB of swap space in addition while the machine grinds slowly to a halt.

I'm wondering whether this is
again (an upstream gcc bug, fix in-progress).

I'm hoping someone here might know how to find the source of the problem
so I can add some helpful details to my bug report.

1. If you compile with -fno-var-tracking does it still use lots
of memory?

That flag fixes the memory problem, so my bug must be the same, I think.

2. (for the ludicrously enthusiastic only) build a gcc with the patches
listed in that bug report and see if the problem goes away...

I fetched the patch and found that it doesn't apply cleanly to the heavily
patched gentoo sources :(

Many thanks for the excellent clue.

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