FIX: Namespace and Typedef Cause C1001:'msc1.cpp',line 1090

• The Microsoft C/C++ Compiler (CL.EXE) included with: - Microsoft Visual C++, 32-bit Edition, versions 4.0, 4.1, 4.2

SYMPTOMS

A program that uses a namespace including a typedef name for the base class name may cause the compiler to generate the following error message:

   fatal error C1001: INTERNAL COMPILER ERROR

  (compiler file 'msc1.cpp', line 899)  <if using version 4.0>
  (compiler file 'msc1.cpp', line 1090) <if using version 4.1>
  (compiler file 'msc1.cpp', line 1089) <if using version 4.2>
  Please choose the Technical Support command on the Visual C++
  Help menu, or open the Technical Support help file for more information
  Error executing cl.exe.

RESOLUTION

Avoid a typedef name for the base class within a different derived class namespace.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug was corrected in Visual C++ version 5.0.

MORE INFORMATION

Sample Code

   /* Compile options needed:
   */
   //messages.cpp

   namespace X {
       class A{};
       typedef A B;
   }
   namespace Y{
       class C: public X::B{};
   //  Work around:  replace the above line with  the following:
   //  class C : public X::A{};

   }