powerpc*-*-gnu configuration support

[Aldy Hernandez]

>>>>> "Roland" == Roland McGrath <roland@gnu.org> writes:

 > table, and the table doesn't contain all the options actually supported by
 > config/rs6000/sysv4.h (missing are aixdesc, freebsd, i960-old).  The table
 > (though not the summary) lists -mcall-solaris, which AFAIK does not exist
 > at all.  Also, all the descriptions for -mcall-* options in the table seem
 > to be misleading.  That is, each says "On System V.4 and embedded PowerPC
 > systems compile code for the XXX system."  But in fact, these options are
 > supported by configurations that are neither "System V.4" nor "embedded".

Woah there.

We are trying to change -mcall-foo to -mabi=foo.  I have already added
the infrastructure in rs6000.c.  Please try to use this instead.  Once
I'm done my altivec hell, i will rewrite all -mcall* into -mabi=* for
ppc.

This way we will be able to do things like -mabi=aix,eabi,altivec
etc.  Plus, -mabi is prettier.

Aldy