Sender:	nate AT cartsys DOT com
Message-ID:	<365F1F5C.4C2B9436@cartsys.com>
Date:	Fri, 27 Nov 1998 13:53:32 -0800
From:	Nate Eldredge <nate AT cartsys DOT com>
X-Mailer:	Mozilla 4.05 [en] (X11; I; Linux 2.0.35 i486)
MIME-Version:	1.0
To:	djgpp AT delorie DOT com
Subject:	Re: odd behaviour.
References:	<73i719$bmd$1 AT clam DOT niwa DOT cri DOT nz>
Reply-To:	djgpp AT delorie DOT com

Richard Pett wrote:
> 
> I have noticed the following odd behaviour in a program which I just wrote
> using DJGPP and Allegro:
> 
> I declared a bitmap, (BITMAP *buffer2;) but then never got around to using
> this variable for anything.  The program compiles OK but when I execute it,
> it immediately terminates, apparantly due do allegro_exit() being called.
> 
> Although I have fixed this problem by simply removing the declaration, I was
> curious to know if anyone can tell me why this problem occured in the first
> place - nothing bad happens if an integer is declared and then not defined.
> Is this a BITMAP thing?  An Allegro thing? A DJGPP thing?
> 
> All though this is not important, I would like to know if anyone is able to
> explain this very odd behaviour.   Thanks :-)

No, it shouldn't cause a problem.  The fact that it did seems to imply
that something else is wrong.  In particular, memory overrun crashes are
often very sensitive to memory layout, and removing or adding a single
variable can change things considerably.  So most likely, you have a
bug.  If you can't find it, you may want to post your source if it's
short.
-- 

Nate Eldredge
nate AT cartsys DOT com

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