From: Tom St Denis <stdenis AT compmore DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Nasm & Gcc. HELP!
Date: Fri, 05 Jan 2001 17:00:58 GMT
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References: <934tdg$oj0$1 AT nnrp1 DOT deja DOT com>
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In article <934tdg$oj0$1 AT nnrp1 DOT deja DOT com>,
  pixelpajas AT my-deja DOT com wrote:
>
>
> Hi .. I'm trying to learn how to use nasm
> assembler code with gcc but i get an error when i
> link the objects. Below are the source files and
> command compile/link entries.
>
> - 4k.c ----------------------------------------
>
> extern unsigned int keyget(unsigned int);
>
> void main(void)
> {
> 	keyget(1);
> }
>
> -----------------------------------------------
>
> - lib.asm -------------------------------------
>
> [BITS 32]
> [GLOBAL _key]
> [SECTION .text]
>
> _key:         MOV       CX,1
>
> keyloop:      MOV       AH,01h
>               INT       16h
>
>               JZ        keyloop
>               MOV       AH,00h
>               INT       16h
>
>               MOV       AH,0Ah
>               INT       10h
>
>               CMP       AL,0Dh
>               JNE       keyloop
>
>               MOV       AH,4Ch // clean exit
>               INT       21h    // ----------
>
> -----------------------------------------------
>
> first i build lib.asm -> nasm -f coff lib.asm
>
> then i compile 4k.c -> gxx -nostdlib -nostdinc -
> fno-builtin -fno-exceptions -c -O3 4k.c -r
>
> and at last i try to link -> ld -nostdlib -
> nostdinc -fno-builtin -fno-exceptions -e _main -
> oformat binary -o 4k.com 4k.o lib.o
>
> but in the last step i get -> " 4k.o
> (.text+0x6):4k.c: undefined reference to `_keyget
> (unsigned int)' "
>
> Is there anyone out there that can help me and
> tell me what im doing wrong???

My only suggsetion is to put the "global" declaration inside your
section .ie

[section .text]
[global _keyget]
...

perhaps?

Tom


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