gcc and universal binaries

[Ryan Schmidt]

On Aug 24, 2013, at 07:29, Samuel Halliday wrote:

> I'm using the macports distro of gcc in order to get fortran support.
> 
> Could somebody please show me how to build universal binaries that work on the four targets: PPC/Intel 32/64?
> 
> I presume I'll need to get this fixed:
> 
> $ file /opt/local/lib/libgcc/libgfortran.3.dylib 
> /opt/local/lib/libgcc/libgfortran.3.dylib: Mach-O 64-bit x86_64 dynamically linked shared library

Edit /opt/local/etc/macports/macports.conf and set universal_archs to x86_64 i386 ppc64 ppc. Then reinstall libgcc with the universal variant. And maybe the gcc port you're using too. If you already had any ports installed using the universal variant they'll have to be rebuilt using the new set of architectures. Not sure if MacPorts will do that for you automatically or not.

I would expect that modern versions of OS X cannot build for PowerPC anymore, so you'll need to be running as sufficiently old version of OS X. Lion and later are too new. Snow Leopard is probably old enough. Leopard is definitely old enough. Tiger is too old to build 64-bit in some cases.