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Date:	Tue, 30 Dec 2003 23:03:11 -0500
To:	Jani Tiainen <jani DOT tiainen AT keypro DOT fi>, cygwin AT cygwin DOT com
From:	Larry Hall <cygwin-lh AT cygwin DOT com>
Subject:	Re: DLL and external symbols
In-Reply-To:	<3FF1EFB3.5000509@keypro.fi>
References:	<3FF1EFB3 DOT 5000509 AT keypro DOT fi>
Mime-Version:	1.0

At 04:35 PM 12/30/2003, Jani Tiainen you wrote:
>Hi,
>
>I'm sure that this has been answered several times, but I'll ask again because couldn't find any solution by myself.
>
>I would like to build DLL (or any other sort of library) that refers to external symbols in main application.
>
>So far I have been able to build non-working constructs. =)
>
>Let's say that I've two files:
>
>main.c:
>
>#include <stdio.h>
>
>extern void funcInMyLib(int);
>
>void funcInMain(int i)
>{
>    printf("funcInMain(%ld)\n", i);
>}
>
>int main(int argc, char **argv)
>{
>    funcInMyLib(1);
>    return 0;
>}
>
>and second file (library)
>
>mylib.c:
>extern void funcInMain(int);
>
>void funcInMyLib(int i)
>{
>    printf("Calling back...");
>    funcInMain(i + 1);
>}
>
>--------
>
>Now how I can get this working, or is it possible at all?


It's possible but you have to move "funcInMain()" into the DLL with 
"funcInMyLib()" or into another DLL.  That's the straight-forward 
answer.


--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     


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