nasm gcc command error with subprogram as seperate file

Question

testing subprograms as external files in nasm. After running :

nasm -f elf subprogram2.asm
nasm -f elf get_int.asm

I then run the gcc:

Answer 1

Quoting from the NASM manual:

GLOBAL is the other end of EXTERN: if one module declares a symbol as EXTERN and refers to it, then in order to prevent linker errors, some other module must actually define the symbol and declare it as GLOBAL.

So if get_int is defined in get_int.asm you should put the global get_int in get_int.asm, and declare it as extern in any other files that want to use get_int.