AFAIK Xcode still ships with gcc, even though llvm-gcc is default. I regularly use "brew install --use-gcc" for things that don't work with llvm-gcc.
I believe rake should allow you to specify a C compiler on the command line. Even if it doesn't, you can temporarily change your CC environment variable to point to the gcc binary instead of llvm-gcc and things will probably work. Probably.
I thought the same thing and while it should work like that it doesn't. I've gone through specifying the compiler, making a symbolic link to GCC, messing with my bash_profile... there's just a lot of problems. I'm probably going to have to do a clean install of Lion as getting things to all work involves a fragile, and very specific
Procedure I think I've found.
I believe rake should allow you to specify a C compiler on the command line. Even if it doesn't, you can temporarily change your CC environment variable to point to the gcc binary instead of llvm-gcc and things will probably work. Probably.