FIX: /Og Causes C1001 with Member Lookup in an Infinite Loop (173025)

The information in this article applies to:

Microsoft Visual C++, 32-bit Enterprise Edition 5.0
Microsoft Visual C++, 32-bit Professional Edition 5.0

This article was previously published under Q173025

SYMPTOMS

Compiling code similar to the code 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

This internal compiler error can be avoided by using the volatile keyword. In the example below, declaring the local variable, pB, as volatile B* pB instead of B* pb, will work around the problem.

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:

170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

MORE INFORMATION

Sample

   // compile options: /Og /c
   struct A {
      int i;
   };
   struct B {
      struct A * pA ;
      int j ;
   };
   void f()
   {
      //volatile //uncomment the volatile keyword for workaround
      B * pB =0;
      for (;;)
      {
         pB->j = pB->pA->i++ ;
      }
   }

Modification Type:	Minor	Last Reviewed:	7/5/2005
Keywords:	kbBug kbCompiler kberrmsg kbfix kbVS97sp2fix KB173025