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From:	Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: strange error
Date:	23 Jul 2004 10:31:50 GMT
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Message-ID:	<2mc7omFl9vr1U1@uni-berlin.de>
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Sterten <sterten AT aol DOT com> wrote:
> >m55:r--;if(R[r]!=1)goto m55;

> I think this is the problem.
> r might become smaller 0.
> I should have included a 
> if(r==0)goto m57;

> I'm still puzzled why then the program runs with -g and without -O2
> and with small dummy changes.

Essentially: because that bug causes what the wizards call "undefined
behaviour".  And that means literally _anything_ may happen.  It may
crash only on the 5th Tuesday after Halloween, or send a nasty hate
mail to your boss on Valentine's day.  Whatever you can imagine can
happen, and then some.

-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.

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