Yep, you can compile it on 64 bit OS X with clang's -m32 option and it should work: ➜ c4 git:(master) ✗ clang -m32 c4.c ... ➜ c4 git:(master) ✗ .

Yep, you can compile it on 64 bit OS X with clang's -m32 option and it should work: ➜ c4 git:(master) ✗ clang -m32 c4.c ... ➜ c4 git:(master) ✗ ./a.out hello.c hello, world exit(0) cycle = 9