The Winner Takes It All

There are four possible solutions:

1. Recompile the C-Runtime by yourself and change the code to:
  (but then you have to use own names instead of MSVCRT!)

        /* break into debugger at specific memory allocation */
        if (_crtBreakAlloc != -1L && lRequest == _crtBreakAlloc)
            _CrtDbgBreak();

2. Update to VC7

3. Register your own hook for allocation, and set the _crtBreakAlloc to a
valid value...:

int __cdecl MyAllocHook(
   int      nAllocType,
   void   * pvData,
   size_t   nSize,
   int      nBlockUse,
   long     lRequest,
   const unsigned char * szFileName,
   int      nLine
   )
{
  switch(nAllocType)
  {
  case _HOOK_ALLOC:
  case _HOOK_REALLOC:
    _crtBreakAlloc = lRequest-1;
    break;
  }
  return 1;

  char *pTest = NULL;
  // do arround 0x10 * 0x100000000 allocs (the lRequest-value wraps 0x10
times....)
  for (int a = 0; a < 10; a++)
  {
    for(int b = 0; b <= 0xffffffff; b++)
    {
      pTest = (char*) malloc(10);
      strcpy(pTest, "sodelle");
      free(pTest);
    }
    printf("\nWrap %d", b+1);
  }

--
Greetings
  Jochen