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Q173092: FIX: /Og Causes C1001 Traversing Non-Trivial List of Pointers

Article: Q173092
Product(s): Microsoft C Compiler
Version(s): WINNT:5.0
Operating System(s): 
Keyword(s): kberrmsg kbCompiler kbCPPonly kbVC kbVC500bug kbVS97sp2fix
Last Modified: 17-JUL-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- The C/C++ Compiler (CL.EXE), included with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 5.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

Compiling code similar to that in the sample below may cause the following error
to be generated:

  fatal error C1001: INTERNAL COMPILER ERROR (compiler file
  'E:\utc\src\\P2\main.c', line 379)

RESOLUTION
==========

In the sample below, initializing all the local integers to known values,
instead of leaving them uninitialized, will allow the code below to compile
without generating the C1001 error.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug has been fixed in Visual Studio 97 Service
Pack 3.

For more information, please see the following article in the Microsoft Knowledge
Base:

  Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

MORE INFORMATION
================

Sample
------

     // compile options: /Og /c
     struct B;
     struct A {
        B * pB;
     };
     struct B {
        A * pA;
        B * pBnext;
        B * pBb;
     } ;
     void f() {
        int i;    // initialize for workaround
        int j;    // initialize for workaround
        int k = 0;
        B * pB1;
        B * pB2 = 0;
        B * pB3;
        B * rgpB[2];
        int rgi[2];
        while(1)
        {
           rgi[i] = k++;
           pB2 = pB2->pBb;
           rgpB[k] = pB2;
           j = k++;
           pB3 = rgpB[j];
           pB1 = pB3->pA->pB;
           while (pB1)
              pB1 = pB1->pBnext;
        }
     }

Additional query words: ICE

======================================================================
Keywords          : kberrmsg kbCompiler kbCPPonly kbVC kbVC500bug kbVS97sp2fix 
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : WINNT:5.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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