OSDev.org

I am just wanting to combine a Nasm obj with C obj to create an .exe

But the only compile options I run across are for kernels not aps..

Does any one here know what options are needed?

Nasm -f obj file.asm
GCC ???
how would I link with into a gcc linked exe
Under XP -

nasm gcc

I really don't know, I'm not good at C with OS development, but I think you might need an extern somewhere.

Sorry I can't help much,
Troy

I've never tried this in Windows before, but this link appears useful.

Thanks : stephenj
It worked!

also no extern was needed.. :Troy Martin
but thanks anyway!

you just need to define the funtion in the c app like below:
nasm:
_function:

ret

gcc:
void function();
int main()
{
funtion();
return 0;
}

For what i know it might have worked, but the correct way to deal with it is with an extern.
When you do You are telling the compiler that function() will be defined later in the same translation unit (the way C calls a file, so to say). What, obviously is not the case.
This might have worked with ld (what gcc calls to link everything), but is not guaranteed to work in other compilers.

You should do To say that function() is in a extern translation unit (file). And then everything should be ok

Cheers,
KM

Khaoticmind wrote: This might have worked with ld (what gcc calls to link everything), but is not guaranteed to work in other compilers.

Actually, extern with function declaration should be no-op, see http://c-faq.com/decl/extern.html.

Ztane wrote:

Khaoticmind wrote: This might have worked with ld (what gcc calls to link everything), but is not guaranteed to work in other compilers.

Actually, extern with function declaration should be no-op, see http://c-faq.com/decl/extern.html.

Good point! Otherwise no linking would ever work with my code
My mistake!