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Message-ID: <3FF26A27.7090301@keypro.fi>
Date: Wed, 31 Dec 2003 08:18:15 +0200
From: Jani Tiainen <jani DOT tiainen AT keypro DOT fi>
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To: Cygwin List <cygwin AT cygwin DOT com>
Subject: Re: DLL and external symbols
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Larry Hall wrote:
> 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. =)
>>

[snipsnip]

>>
>>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.

Yes, that one I knew already. Problem isn't actually function, in my 
real case it's more like having some globals that libraries should be 
able to read.

So let's extend this main.c a little bit:

#include <stdio.h>

/* Global that is set here and printed from DLL */
int anotherValue = 0;

/* Function in DLL */
extern void funcInMyLib(int);

void funcInMain(int i)
{
     printf("funcInMain(%ld) (anotherValue=%d)\n", i, anotherValue);
}

int main(int argc, char **argv)
{
     antoherValue = 123;
     funcInMyLib(1);
     return 0;
}

--------

Now, that's what I really want to do, or at least something equivalent, 
more portable solution. (I'm really trying to port bigger application 
that has plugin modules built like this.)

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