Setting gcc3opt should be done as a commandline arguments to Scons. 
For myself, I have a simple build.sh file that just calls scons with
the commandline flags I use, i.e.:

#!/bin/sh
scons gcc3opt=pentium3 noDebug=1 ...

(I'm not on my linux computer at the moment so can't recall what args I use)

I use my build.sh whenever I build and if I experiment with flags I
edit it there, not the Sconstruct file or custom.py.

You can see the commandline options for the build system by running:

scons -h

Hope that helps!
steven


On 4/9/06, Iain Duncan <iainduncan@telus.net> wrote:
>
> >>>So, do you mean the code works OK without optimization, but crashes if
> >>>compiled with optimization ? That sounds like a possible compiler bug;
> >>>what compiler version is used in your current distribution ? You could
> >>>also experiment with various compiler flags to see when the crash occurs
> >>>and when it does not (example customCCFLAGS settings: "-O", "-O2",
> >>>"-O2 -fno-strict-aliasing").
> >>
> >>Can you tell me what I should be using for the gcc3opt flags?
> >
> >
> > For debugging, gcc3opt should not be used. Otherwise, the gcc manual
> > documents these CPU types for -march:
> >
> >     _k8, opteron, athlon64, athlon-fx_
> >           AMD K8 core based CPUs with x86-64 instruction set support.
> >           (This supersets MMX, SSE, SSE2, 3dNOW!, enhanced 3dNOW! and
> >           64-bit instruction set extensions.)
> >
> > Try using one of the above (for example, gcc3opt=k8), and see if that
> > works. Or, if these all fail, just add buildRelease=1 or use customCCFLAGS.
>
> Sorry, I'm still confused. Where do I set that option? ( gcc3opt=k8 ) I
> assume I set it to 1 in SConstruct, and then in one of the custom.py
> options?
>
> Thanks
> Iain
>
>
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