Sparc64 support

[Adrian Chadd]

Hi,

What's missing is someone funding / finishing the push to external
toolchain support for all platforms.

What's also missing a little bit here is the tier-1-ness of the
external toolchain support by the people using/developing other
toolchains.

It's basically there. There are some rough edges, but since the
compiler-developer people aren't using it and the non-x86-building
people aren't being forced to use it, the development inches along
very slowly.

If you'd like to erm, "rush" this along, we should actively start the
"deorbit gcc-4.2 by freebsd-11" and "disconnect gcc-4.2 from the -head
build" movement now, get those bits done, and start arm-twisting to
get the last bits finished.

I've built and run MIPS and MIPS64 with gcc-4.9 - I'll try gcc-5.x
next week now that that's the compiler in the ports system. I'll try
to do the same for sparc64. We should do the same for PPC next up.

So, who's up for it? Let's just get this gcc-4.2 in base removed already.




-adrian