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Asked: 2026-05-15T05:53:25+00:00

i have some problems with linking nasm program for macos: GLOBAL _start SEGMENT .text

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i have some problems with linking nasm program for macos:

GLOBAL _start
SEGMENT .text
_start:
    mov ax, 5
    mov bx, ax
    mov [a], ebx
SEGMENT .data
a   DW 0
t2  DW 0

fry$ nasm -f elf  test.asm
fry$ ld -o test test.o -arch i386
ld: warning: in test.o, file was built for unsupported file format which is not the architecture being linked (i386)
ld: could not find entry point "start" (perhaps missing crt1.

fry$ nasm -f macho  test.asm
fry$ ld -o test test.o -arch i386
ld: could not find entry point "start" (perhaps missing crt1.o)

can anyone help me?

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1 Answer

  1. Editorial Team

    The Mac OS X linker can’t link ELF objects. It works only with the Mach-O executable format. Unless you want to figure out how to translate the object files, you’ll probably be better off writing code that works with the Mac OS X assembler.

    Edit: As @Fry mentions in the comment below, you can make nasm put out Mach-O objects. In that case, the problem is simple – take the _ off of _start in both places in your source file. The result links fine.

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