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I'm trying to run a basic assembly file using 64 Bit Mac OS X Lion, using nasm and ld which are installed by default with Xcode. I've written an assembly file, which prints a character, and I got it to build using nasm. nasm -f elf -o program.o main.asm However, when I go to link it with ld, it fails with quite a few errors/warnings: ld -o program program.o ld: warning: -arch not specified ld: warning: -macosx_version_min not specificed, assuming 10.7 ld: warning: ignoring file program.o, file was built for unsupported file format which is not the architecture being linked (x86_64) ld: warning: symbol dyld_stub_binder not found, normally in libSystem.dylib ld: entry point (start) undefined. Usually in crt1.o for inferred architecture x86_64 So, I tried to rectify a few of these issues, and got nowhere. Here's one of things I've tried: ld -arch i386 -e _start -o program program.o Which I thought would work, but I was wrong. How do you make the object file a compatible architecture that nasm and ld will agree with? Also, how would you define the entry point in the program (right now I'm using global _start in .section text , which is above _start , which doesn't seem to do much good.) I'm a bit confused as to how you would successfully link an object file to a binary file using ld, and I think I'm just missing some code (or argument to nasm or ld) that will make them agree. Any help appreciated.

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