Could you help me out?

[Ken Tan <ken at pythonvideo dot com>]

Dear Sir/Madam,

I am facing a problem described as followed, could you tell me how to fix it?
I am not sure whether or not it is bug.

Thanks in advance,

Ken Tan

1)
`gcc -- version` = 2.95
`g++ -- version` = 2.95
System type = Solaris 7 / SPARC

2)
Source code is follwed as below named (e.g. test.cc)
Compiling command `gcc test.cc` or `g++ test.cc`
The core is dumped when a.out is running "sum += *(unsigned int*)(ptr + i) ;"
The runing on Linux/X86 is OK.

3)
Source code:
/* srouce code starting ....
  The core is dumped when the sentence "sum += *(unsigned int*)(ptr + i) ;" of
  this program is excuting.
  But it is ok when the sentence "sum += *(unsigned int*)(ptr + i / 4 * 4) ;" of
  this program is excuting.

  Is this a bug for g++/gcc version 2.95 / Solaris 7 / SPARC ?
  Or should I use some options in the compiler command line?
**/

#include        <stdio.h>
#include        <unistd.h>
#include        <string.h>
#include        <memory.h>
#include        <malloc.h>

int main(int argc, char* argv[])
{
  char*         ptr ;
  unsigned int  len ;
  unsigned int  i ;
  unsigned int  sum ;

  if(argc != 2){
    printf("Usage: %s argument.\n", argv[0]) ;
    return -1 ;
  } ;

  if((ptr = (char*) malloc(len = strlen(argv[1]) * 8)) == (char*)NULL){
    printf("Not enough virtual memory\n") ;
    return -1 ;
  } ;

  memset(ptr, (int)NULL, len) ;
  strcpy(ptr, argv[1]) ;

  sum = 0 ;
  for(i = 0 ; i < strlen(ptr) - sizeof(unsigned int) + 1 ; i ++){
    printf("(%u)before plus sum\n", i) ;
#   if defined(ALIGN)
      sum += *(unsigned int*)(ptr + i / 4 * 4) ;/* OK */
#   else
      sum += *(unsigned int*)(ptr + i) ;        /* Bus Error - core dumped */
#   endif
    printf("(%u)after plus sum\n", i) ;
  } ;

  return 0 ;
}
/* source code end. */