Q319797: BUG: An Access Violation Occurs When You Use the /Og Switch for

Article: Q319797
Product(s): Microsoft C Compiler
Version(s): 3.0,4.0
Operating System(s): 
Keyword(s): 
Last Modified: 08-APR-2002

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The information in this article applies to:

- Microsoft Windows CE eMbedded Visual C++, version 3.0, on platform(s):
   - x86 
- Microsoft Windows CE Platform Builder, versions 3.0, 4.0, on platform(s):
   - x86 
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SYMPTOMS
========

When an application makes a call and uses a parameter that is the result of a
static member function, or uses a parameter that is a result of a non-member
function that is returning an object, the application may generate an access
violation.

CAUSE
=====

Global optimization may push an incorrect pointer for the object parameter in
the call. Subsequent use of this object pointer in the callee may result in
corrupted memory.

RESOLUTION
==========

Turn off global optimization for the module or function that encounters these
problems.

To turn off global optimization, use one of the following methods:

- Use the /Og- switch.

- Do not include /Og or switches that use it, such as /Ox.

- Use the IDE compiler optimization project settings.

- Use #pragma optimize.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

  struct ClassA
  {
  	virtual ~ClassA()
  	{
  	}

  	static ClassA CreateObject() 
  	{ 
  		return ClassA(); 
  	}
  };

  void fn2( ClassA a , int* pi )
  {
  	*pi = -1;
  }

  void main()
  {
  	int i;

  	fn2( ClassA::CreateObject(), &i);
  }

Additional query words:

======================================================================
Keywords          :  
Technology        : kbVCsearch kbAudDeveloper kbWinCEETKSearch kbWinCESearch
Version           : :3.0,4.0
Issue type        : kbbug
Solution Type     : kbpending

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