I dropped the ball on getting things like this integrated last time, because
   I became swamped with personal things unexpectedly.  I will be looking at
   making this a bit more uniform--particularly, to do proper a.out/ELF
   detection when using config.guess for a native host--and getting those
   changes back to the gcc trunk.


FWIW, thorpej is in the middle of doing a large portion of this work.
you should talk to him about it.  he has been working from gcc-current.