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From: "John Hanley" <jdhanley AT telusplanet DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: errors when linking
Date: Thu, 26 Aug 2004 20:43:13 -0600
Organization: University of Alberta
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com


"DJ Delorie" <dj AT delorie DOT com> wrote in message
news:200408262337 DOT i7QNbXEt031947 AT envy DOT delorie DOT com...
>
> > I was under the impression that if you #include your .h file, the
> > declaration is included at compile time in your .c file.  I am not
> > quite sure I understand why I would need to declare them twice.
>
> This isn't djgpp-specific, but to summarize:
>
> --- foo.h ---
> extern int i;
> extern int f();
>
> --- a.c ---
> #include "foo.h"
>
> int v()
> {
>   i = f();
> }
>
> --- b.c ---
> #include "foo.h"
>
> int i;
>
> int f()
> {
> }

That's great DJ!  I didn't know this about global variables.  Doing this
took care of my "undefined references" errors just great!

Do you have any idea what might be the problem with my "multiple
definitions" error?  I just have a .h file with 3 structs and a bunch of
function prototypes.  I #include them in my main.c and program.c files.  I
am not sure why I am getting these errors.

I realize this may not be a DJGPP specific question, but I really do
appreciate all your help.

Thanks again DJ!

Best regards,
John