how do I build a universal binary with xcode 3.2.6?

I am using XCode 3.2.6 on an Intel Mac running OS X 10.6, to build a fairly simple app that needs to be able to run under OS 10.4 on a PPC-based Mac, in addition to modern Intel-based Macs.

Under the project settings, I only see options for 32-bit Intel, 64-bit Intel, and Standard (32/64 Intel). Should I be seeing a "Universal Binary" entry here?

I don't have any problem running it under 10.4 on an Intel Mac. I was careful not to use feature开发者_JAVA技巧s that don't work under 10.4, and I think I set the project settings correctly to allow it to be backward-compatible to 10.4. It's just that I can't figure out how to get it to compile for PPC.

I'm flailing around, trying to figure out how to build a universal binary, and I think I'm probably just missing something obvious. Any help would be greatly appreciated.

You don't have to choose one of the predefined settings for the Architectures build setting. You can choose "Other..." and then explicitly enter a list of architectures like ppc, i386, x86_64.

By the way, there are extra tricks if you need to run on G3s: You must use GCC 4.0 and the 10.4 SDK.