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From: elric AT wheel DOT ucdavis DOT edu (Jeffrey Taylor)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: (none)
Date: 9 Jan 1996 20:07:39 GMT
Organization: Davis Community Network - Davis, California, USA
Lines: 39
Message-ID: <4cuhub$16o@mark.ucdavis.edu>
References: <Pine DOT LNX DOT 3 DOT 91 DOT 960108163815 DOT 29099B-100000 AT noether DOT nyongwa DOT montreal DOT qc DOT ca>
NNTP-Posting-Host: wheel.dcn.davis.ca.us
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

dunder (dunder AT nyongwa DOT montreal DOT qc DOT ca) wrote:

: We are currently making a relatively big program in C++. We wrote it in 
: Turbo C++. We arranged it so it could be compiled within GCC (dj's) (ie 
: arranging the random() pow(long, long) and itoa() [wich we had to redo 
: ;)] but it seems that GCC doesn't support it. It compiles well, without 
: warnings but the executable doesn't work (its NOT a renamed COFF file ;))
: It bugs 'at start'. Go32 v1.11.maint4 reports:
:  
: Segment violation in pointer 0x00000000 at d8:de81
: eax=00020008 ebx=0001d110 ecx=00000000 edx=00000000 esi=00000000 edi=00000000
: ebp=7ffffc88 esp=7ffffc4c cs=d8 ds=48 es=48 fs=48 gs=48 gs38 ss=48 
: cr2=00000000
: Call frame traceback EIPs:
:   0x0000de81
:   0x00003d45
:  
: It works fine compiled with TC... Is this error sent by a particular bug 
: en DJGPP or by some 'TC supported' functions or syntax that GCC handles 
: badly? Thanx

: < dunder AT nyongwa DOT montreal DOT qc DOT ca >


Many compilers allow you to dereference the NULL pointer, but this is not 
ANSI C standard.  this is one of many possiblities.  Bugs that were there 
all along showing up when you move to a new platform are common.  I had a 
bug that went undetetected thru Microsoft Visual C++, Borlnad C++, and 
DJGPP showed up when I moved to a Sun (I was deleting a statically 
allocated array of pointers to dynamic objects, instead of the dynamic 
objects).

Use the debugger to find out what's really going on.

 --
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Without my guitar, I am a poet without arms.
                        - Michael Bloomfield
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