Message-ID: <3604E00D.4EE306EF@mailexcite.com>
Date: Sun, 20 Sep 1998 06:59:26 -0400
From: Doug Gale <dgale AT mailexcite DOT com>
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Newsgroups: comp.os.msdos.djgpp
Subject: Re: Tricks of the Game Programming Gurus -> DJGPP
References: <19980920032351 DOT 08728 DOT 00001580 AT ng-fc2 DOT aol DOT com>
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Aaron StJ wrote:

>      The problem:  When a ray is cast verticall, the program goes boom (see the
> error it gives me, postes at the end of this message)!  In LaMothe's code,
> there is something to correct for asymptotes, but it doesn't seem to work as
> comiled by gcc.  Any suggestions? (email if you want the source I came up with)
>
> The error it gives me:
>
> General Protection Fault at eip=00001f63
> eax=0129e005 ebx=00000219 ecx=00000006 edx=0129dfff esi=00000054 edi=0003b824
> ebp=0128df74 esp=0128def0 program=A:\RAY.EXE
> cs: sel=00a7  base=82c3e000  limit=0129dfff
> ds: sel=00af  base=82c3e000  limit=0129dfff
> es: sel=00af  base=82c3e000  limit=0129dfff
> fs: sel=00c7  base=00000000  limit=ffffffff
> gs: sel=00c7  base=00000000  limit=ffffffff
> ss: sel=00af  base=82c3e000  limit=0129dfff
>
> Call frame traceback EIPs:
>   0x00001f63
>   0x000029f9
>   0x00022bc2
>
> .---------------------------------------------------------------.
> | Aaron St.John - Atari 2600 Collector, djgpp newbie, pov-ray   |
> | fan, man with the most boring .sig, etc.                      |
> `---------------------------------------------------------------'

Run your program, make it print that crash dump quoted above, and type:
   symify ray.exe

This will print the name of all functions on top of the traceback, nested back to
your main() function. This will probably help you locate the error in your source.