In my case the binary turned out to be much larger than I would have expected. I was expecting a couple hundred bytes tops, but 8k? osx-box:dev esa$ nasm -f

In my case the binary turned out to be much larger than I would have expected. I was expecting a couple hundred bytes tops, but 8k? osx-box:dev esa$ nasm -f macho hello.asm && ld -e _start -o hello hello.o osx-box:dev esa$ ls -lh hello* -rwxr-xr-x 1 esa staff 8.1K Sep 5 22:43 hello -rw-r--r-- 1 esa staff 721B Sep 5 22:39 hello.asm -rw-r--r-- 1 esa staff 389B Sep 5 22:43 hello.o