This would be rather unfortunate as that would also leave out all 32-bit only AMD processors (Athlon XP & co) as well according to Wikipedia where it's said Athlon 64 was the first one to add SSE2 and it can already run the 64-bit CentOS anyway.

I'm hoping there is more people that could +1 having support for pre-SSE2 CPUs so it would be seriously considered even though it might need massive rebuild of the multilib packages. EPEL doesn't have multilib yet (right?) so they can still adapt to whatever is going to be done. The packages would run on upstream as well anyway.

Taking into account the actual computing power of CPUs, I don't think it's unreasonable to run CentOS 7 on Pentium III or Athlon XP.

Thanks for considering.

On Fri, Jun 5, 2015 at 9:44 PM, Johnny Hughes <johnny@centos.org> wrote:

On 06/05/2015 05:46 AM, Vladimir Stackov wrote:
> Greetings,
>
> currently we are maintaining own CentOS 7 i686 rebuild and I would like
> to kindly ask you to replace following macros from gcc.spec:
>
> %if 0%{?rhel} >= 7
> %ifarch %{ix86}
> --with-arch=x86-64 \
> %endif
> %ifarch x86_64
> --with-arch_32=x86-64 \
> %endif
>
> with that:
>
> %if 0%{?rhel} >= 7
> %ifarch %{ix86}
> --with-arch=i686 \
> %endif
> %ifarch x86_64
> --with-arch_32=i686 \
> %endif
>
> x86-64 causes gcc to use extended instruction set for produced code and
> it's impossible to run CentOS 7 i686 on older systems without SSE2
> instruction because of SIGILL.
> This affects Pentium 3, old VIA CPUs, old Xeons and some others.
>
> Is that possible?
> Thanks!
>

<snip>

I don't think we can do this as I also use the RPMs produced for the
multilib portion of CentOS-7 x86_64 and we want our RPMs to be like
those from upstream for that purpose.

Thanks,
Johnny Hughes

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