fat binaries for FSF gcc on Darwin?

[Jack Howarth]

   I noticed that Apple's gcc compiler in MacOS X 10.4
creates fat binaries in /usr/lib rather than using a 
ppc64 or x86_64 subdirectory like FSF gcc. Do the Darwin
gcc developers ever intend to replicate the use of fat
binaries for FSF gcc (in gcc 4.3 perhaps) or will
we always use separate subdirectories for 32-bit and
64-bit shared libraries?
                  Jack