Now that I have a working Mac OS X setup, added the initial groundwork for the OS X port. This C file works correctly on both amd64 and i386 with clang [-m32] runtimetest.c -lobjc -framework Foundation; it will be converted to Go now.
Ported the runtime test to Go. It works in both 32-bit and 64-bit!
Added a helper script for building 32-bit darwin binaries.