Compiling with GCC on Multiple Architectures (e.g., PPC and Intel)

Introduction

This type of compilation happens in two phases. The first phase is to compile separately for Intel and PPC architectures. The second phase is to create a binary that combines both architecture binaries.

Creating Binaries for Different Architectures

On Intel, I can compile with gcc like this:

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gcc -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk prog.c

For the Makefile, edit it and look for the following options to specify the architecture:

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-arch and -isysroot

Assembly

Once you have your two architecture binaries, you need to merge them:

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lipo -create ppc/prog i386/prog -output prog

Note: It seems that at the gcc compilation level, you can simply use the following options to avoid having to do the assembly step:

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-arch ppc -arch i386