FIX: C1001 Fatal Error in File Main.c, Line 413 for /O1 or /O2

The information in this article applies to:

• The Microsoft C/C++ Compiler (CL.EXE), included with:

      - Microsoft Visual C++ for Windows, versions 4.0, 4.1
  

SYMPTOMS

Using /O1 (minimize size) or /O2 (maximize speed) causes a C1001 error in a try block with the following error message:

   fatal error C1001: INTERNAL COMPILER ERROR
    (compiler file '\school.tp3\test\c10\src\P2\main.c', line 413)

CAUSE

The cause of the problem is having both /Og (global optimizations) and inline function expansion /Ob1 (Only __inline) or /Ob2 (Any Suitable) compiling. /O1 and /O2 are both compound switches, including /Og and /Ob1.

RESOLUTION

Disable either global optimizations (/Og-) or inline function expansion (/Ob1- or /Ob2-). Please see the More Information section below.

STATUS

Microsoft has confirmed this to be bug in the Microsoft products listed at the beginning of this article. This bug was corrected in Visual C++ 32-bit Edition version 4.2.

MORE INFORMATION

The following code reproduces the error when compiled:

   // Compile option needed are: /GX, /W4, and /O1(minimize size)
   // or /O2 (maximize speed)

   struct A
   {
           ~A(){}
   };

   struct B
   {
           A       a;
   };

   void main(void)
   {
           try                     // line 17
           {
               B       *pB = new B[4];
               delete [] pB;  // line 20, warning C4702: unreachable code
           }
           catch(...)
           {
           }
   }

   test.cpp(17) : fatal error C1001: INTERNAL COMPILER ERROR
     (compiler file '\school.tp3\test\c10\src\P2\main.c', line 413)

   cl  /Og /Ob1 /GX /W4 test.cpp

   cl  /Og /GX /W4 test.cpp

   - or -

   cl  /Ob1 /GX /W4 test.cpp