FIX: /GX May Cause C1001 When Using Base Class' Operator Delete (172609)

SYMPTOMS

When attempting to use a base class' operator delete, and using the /GX switch to enable Visual C++ Exception Handling, the following error may be generated:

   fatal error C1001: INTERNAL COMPILER ERROR
       (compiler file 'msc1.cpp', line 1188)

CAUSE

This error will be generated if the base class has a virtual function, the derived class uses the base class operator delete via a using declaration or an access declaration, and the derived class has a function prototyped to return a pointer to a base class, but actually returns a pointer to the derived class. An example can be found in the sample code below.

RESOLUTION

Do not use the /GX switch when attempting to use the base class operator delete.

-or-

Implement an operator delete in the derived class that calls the base class operator delete.

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

The following two samples cause an internal compiler error when built with the compiler's /GX switch. The second sample shows how this can occur when using MFC.

Sample 1

   // compile options: /GX /c
   class A
   {
   public:
       virtual MyFunction();
       void operator delete(void* p);
   };
   class B : public A
   {
   public:
       A::operator delete;
       // using A::operator delete;
       A* func();
   };
   A* B::func()
   {
       return new B;
   }

Sample 2

   // compile options: /GX /c
   #include "afxcoll.h"
   class C : public CObArray
   {
   public:
        CObArray::operator delete;
        // using CObArray::operator delete;
        DECLARE_SERIAL( C );
   };
   IMPLEMENT_SERIAL ( C, CObArray, 1 )