RFC & patch: Rework MIPS command-line handling

[Eric Christopher]

> I hope you mean "via a --with-foo" or "via target name."
> 
> I thought we mostly agreed that having a given target triple imply a
> default ABI (via code in config*) was the right thing.  To me, that's
> "at configure time" too, but the ABI isn't directly selectable by the
> user.

Yes.

I'm not going to change the interfaces to have:

mips64n64-elf
mips64n32-elf
mips64eabi-elf
...

For every target, and a --with-foo option isn't good either. This is
what multilibs are for :)

-eric

-- 
I will not grease the monkey bars