I don’t know if this question is specific to Foundation command line tools, but this is the scenario I need help on.
EDIT
Sorry, I really meant to ask: How do you get XCode 4 to generate a command line tool that is portable between 32 bit and 64 bit Macs?
Check your Build Settings value — it sounds like you want it to be set to “Standard (32/64-bit Intel)”.
Or you can paste this into the build settings directly:
ARCHS = $(ARCHS_STANDARD_32_64_BIT)