Message-Id: <199705091807.UAA03813@zeus.hu.bonus.com>
From: "Abonyi Gyorgy" <loop AT hu DOT bonus DOT com>
To: <djgpp AT delorie DOT com>
Subject: Re: Global Variables
Date: Fri, 9 May 1997 20:07:44 +0200
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Andrew wrote:
> In your header file, on top put something like this:
> #ifndef _MY_HEADER_FILE
> #define _MY_HEADER_FILE
> ...
> your header stuff
> ...
> #endif /* at the end of header file */
> 
> that should solve your problem.
> 
> 
> On 8 May 1997, rellwood wrote:
> 
> > How in the world do I get global variables to be global in several
files
> > that have been linked together?  As my code is now, I have the
> > declarations of the variables in a header file, but when I try to
include
> > it in more then one .c file the linker complians of multiple
> > declairations.  This, of course, makes perfect sense, so I tried making
> > them each extern in the header file, but that didn't work either.
> > 
> > What am I suppose to do here?
> > 
> > Muchos thanks,
> > Richard Ellwood
> >

This will not solve the problem, 'cos the different modules will process
the include file either with the #ifdef... and without it....
 
Never define a variable in a header file !!!!! Header files (or anything
included with the #include directive) are just "included", the compiler
actualy doesn't know, that they are included so they will processed in
every module....

To define global variables place the varibale definition in a (and just in
one) module, and put an extern definition in da header file, for example:

globvars.c:

int dummy;

globvars.h:

extern int dummy;

Gyorgy Abonyi Jr.
loop AT hu DOT bonus DOT com
http://www.hu.bonus.com/~loop