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

[walt]

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
> https://bugs.launchpad.net/gcc-linaro/+bug/714921
> 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.