FIX: C4713: Internal Compiler Error, reg86.c, Line 2934

The information in this article applies to:

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

      - Microsoft Visual C++ for Windows, version 1.0
  

SYMPTOMS

The compiler generates the following internal compiler error message when the sample program below is compiled with /Oe or /Ox:

   warning C4713: func: internal compiler error; restarting
      (compiler file '@(#)reg86.c:1.26', line 2934)

RESOLUTION

The C4713 message is just a warning. The compiler realizes a problem has occurred due to the global register allocation optimization and restarts the compile without the optimization.

There are two ways to eliminate this warning message:

• Use the fast compiler option (/f) instead of the optimizing compiler.

  -or-

• Disable global register allocation optimization by either not using /Oe or /Ox, or use #pragma optimize to disable optimization during the function where the error occurs. The example below shows how to do this.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed above. This problem was corrected in Visual C++ version 1.5.

Sample Code

/* Compile options needed: /c /f- /Oe
*/

#include <ctype.h>

    {
    char * pcItem1;
    char * pcItem2;
    char * pcItem3;
    int nItem4;
    } * PTABLE;

// Uncomment for workaround:
// #pragma optimize ("e", off)

int func (PTABLE ptParam)

    for (;;)
    {
     if (nStatic == '/')
     {
         ptParam->nItem4 = 2;
         ptParam->pcItem3 = ptParam->pcItem2;
         return 7;
     }

     if (nStatic == '\\')
     {
         nStatic = (++(ptParam->pcItem2) < ptParam->pcItem1
          ? *ptParam->pcItem2
          : -1);
     }
    }

// Uncomment for workaround:
// #pragma optimize ("", on)