From owner-freebsd-ppc@FreeBSD.ORG  Mon Dec  8 17:35:42 2008
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Date: Mon, 08 Dec 2008 11:35:33 -0600
From: Nathan Whitehorn <nwhitehorn@freebsd.org>
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Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org>
Subject: Re: Sane CFLAGS.
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Horst Günther Burkhardt III wrote:
> On Mon, 2008-12-08 at 10:13 -0500, Justin Hibbits wrote:
>   
>> Your problem is Altivec - there is no altivec support in the kernel yet, so
>> you'll get SIGILL whenever it hits an altivec instruction.
>>
>> - Justin
>>     
>
> Wow, thanks. Dealt with. 
>
> So... considering I've built most things with those broken CFLAGS, how
> do I go about rebuilding everything I have installed ? :\
>
> (Also, how far along the line is Altivec support expected to be?) :\
>
> Thanks kindly,
> --Horst.
>   
Assuming these are only ports, I would suggest rebuilding ruby by hand, 
then doing a portupgrade -fa, which will force rebuild all ports. If you 
rebuilt critical system components (gcc for instance) with these CFLAGS, 
you might have no option but to reinstall world from CD.

Altivec support shouldn't be too very complicated to add to the kernel 
(a matter of saving/restoring vector registers and parsing VRSAVE), and 
is on my todo list when I have free time again and G5 support is imported.
-Nathan