From: Klaus Petzold <califax AT wupperonline DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Why GPF?
Date: Sun, 27 Sep 1998 16:24:57 +0100
Organization: Customer of SpaceNet GmbH
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Message-ID: <360E58C8.1F87EAD1@wupperonline.de>
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To: djgpp AT delorie DOT com
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Hi,

I get a General Protection Fault when I run the following
program under DJGPP. But why is "t" not allowed to access
"a" via "*t"? Is there a way to get around this problem?

tia
  Klaus

->filename "test.cc"
#include "ttt.h"

unsigned char a = 123, b;

int main()
{
   b = readchar(&a);
}

->filename "ttt.h"
#include "ttt.h"

unsigned char *t;

unsigned char readchar(unsigned char *ptr)
{
   unsigned char a;

   a = (*t);

   return(a);
}

->filename "ttt.cc"
#ifndef ttt_h
#define ttt_h ttt_h

extern unsigned char *t;

unsigned char readchar(unsigned char *ptr);

#endif