From: "John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Help with libraries?
Date: Sat, 09 May 1998 08:37:52 -0400
Organization: Two pounds of chaos and a pinch of salt.
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Lennart Marien wrote:
> 
> So, what I want to do is to write several include files(BTW what are they
> called, couldnīt figure this out, yet!?!) and then write one which links
> them all to itself through
> #include<allmyfiles.h>...
> So that my main file only inludes this one and has access to all those
> functions in the
> other files.If I try to compile something like the above code I only get
> undefined reference for
> blah(1,2);.What can I do?

This is not a DJGPP problem, it's a basic C question.  However, I'll
answer anyway because it's fun.  :-)  What you are talking about are
called "header" files, or "headers."  They are supposed to contain
_declarations_ for code defined in other source modules or libraries. 
You should never put actual code into a header, unless it's inlined. 
Try this instead (and get a good C textbook to help you understand what
a header file is):

------- file1.h:

void blah(int x,int y);

------- file2.h:

void rababer(int z,short f,char r);

------- file1.c:

#include "file1.h"

void blah(int x,int y)
{
[...]
};

------- file2.c:

#include <file2.h>

void rababer(int z,short f,char r)
{
[...]
};

------- Main File:

#include <file1.h>
#include <file2.h>

int main(void)
{
    rababer(1,2,3);
    blah(1,2);
    return 0;
};

----------

You would compile this as:

gcc -Wall -O -g -c file1.c
gcc -Wall -O -g -c file2.c
gcc -Wall -O -g -c main.c    (whatever you call your main file)
gcc -o prog.exe main.o file1.o file2.o

hth!

-- 
John M. Aldrich <fighteer AT cs DOT com> - ICQ UIN# 7406319

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* Anything that, in happening, causes something else to happen,
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