gcc42 ... building for i386 _and_ ppc?

[William Gallafent]

Hi,

I've successfully installed gcc42 on this i386 machine, and it 
works fine for creating i386 binaries. Now I want to make a 
version which creates ppc binaries.

In an ideal world, I'd like one which works in the same way as 
Apple's gcc, allowing the "-arch ppc" and "-arch i386" flags, 
but I understand that this would be difficult to achieve from 
GCC mainline, so I'm happy to have two separate compiler 
builds, perhaps with a different prefix, if there is no smarter 
solution.

So, is there a straightforward way to have two versions of gcc42 
from macports installed on this same machine, one targetting 
i386 and one ppc? In a sense, one is a cross-compiler, with 
host=i386-apple-darwin8, target=powerpc-apple-darwin8.

What does the "universal" variant of gcc42 do? I'm not 
interested in having compiler binaries for ppc, just in 
creating ppc output from the compiler, so I suspect this is not 
for me.

Is there anything I need to consider when targetting Mac OS 
10.3.9 with a compiler built in this way? I'm aware 
of "MACOS_DEPLOYMENT_TARGET=10.3" ... do I also 
need --with-sysroot=/Developer/SDKs/MacOSX10.3.9.sdk or 
anything else similar? Isn't Mac OS X.3.9 
powerpc-apple-darwin7, rather than darwin8? Does this matter?

Pointers to relevant documentation would be welcome!

Thanks,

-- 
Bill Gallafent.