romac · December 22, 2015 01:39
diff --git a/foo.s b/foo.s
 BITS 64

 global _foo

 _foo:
    mov rax, 42
    ret
diff --git a/main.c b/main.c
 #include <stdio.h>

 int foo( void );

 int main( void )
 {
    printf( "%d\n", foo() );

    return 0;
 }
diff --git a/Makefile b/Makefile
 foo: main.o foo.o
 	clang -o $@ $^

 %.o: %.c
 	clang -o $@ -c $^

 %.o: %.s
 	yasm -f macho64 -o $@ $^

 clean:
 	rm foo
 	rm ./*.o

 .PHONY: clean