x86 c++ exception handling

[Karel Gardas]

On 9/12/20 5:33 AM, Joel Sherrill wrote:
> I suspect if you want a common floor it is a Pentium II. That's where SMP
> appeared.
> 
> We can't sanity check the cpu model if we don't know the rules. And if we
> know the rules, we should just drop those low models. And error if someone
> runs on an older model.

Well, I think we may also change a perspective this way: RSB supports
pc.set which builds pc686 by default. So this is SMP safe BSP. I guess
that's what majority of user will use as it is very convenient.

Once someone would like to build variant of pc386 BSP by hand, we may
add clear error/warning about SMP being unsupported on the particular
old BSP.

Attached patch implements this (clear error). It basically allows
--enable-smp only for pc686 and pcp4 BSPs.

Comments welcome!

Thanks,
Karel
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