Q150884: FIX: C1001 Fatal Error in File Main.c, Line 413 for /O1 or /O2

Article: Q150884
Product(s): Microsoft C Compiler
Version(s): 4.00 4.10
Operating System(s): 
Keyword(s): kbCompiler kbCPPonly kbVC
Last Modified: 30-JUL-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- The C/C++ Compiler (CL.EXE), included with:
   - Microsoft Visual C++, 32-bit Editions, 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)

Additionally, C++ exception handling must be enabled (/GX). If the warning level
is set to 4 (/W4), C4702 (unreachable code) warnings are issued before the C1001
fatal error.

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(...)
             {
             }
     }

The following error message is generated:

  

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

Compiling from command line with both /Og (global optimizations) and in-line
function expansion, /Ob1(Only __inline) or /Ob2 (Any Suitable), reproduces the
error. For instance, using:

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

Compiling with the following switch settings in command line does not produce
errors:

  cl  /Og /GX /W4 test.cpp

- or -

  cl  /Ob1 /GX /W4 test.cpp

One workaround when using /O1 or /O2 in Developer Studio is to disable In-line
function expansion (Build:Settings, C++ Tab, Optimizations category). Another
workaround is to disable global optimizations. To accomplish this, choose Custom
for the type of optimization (Build:Settings, C++ Tab, Optimizations category).
Check all categories that apply, but do not check global optimizations. This
behavior is similar to using the components of /O1 or /O2 and eliminating /Og).
An additional method is to leave /O1 or /O2 intact and manually add /Og- to the
Project Options.

Additional query words: kbVC400bug 4.00 4.10 4.20 vcfixlist420 CPPIss

======================================================================
Keywords          : kbCompiler kbCPPonly kbVC 
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : 4.00 4.10
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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