Symptoms

Consider the following scenario:

  • You develop a Microsoft Visual C++ 2010 application in Microsoft Visual Studio 2010.

  • You enable an optimization compiler option for the application, and then you build the application. For example, you enable the Maximize Speed (/O2) optimization compiler option.

  • You run the application.

In this scenario, incorrect machine code is generated. Specifically, some valid instructions may be removed unexpectedly during optimization by the compiler.

Resolution

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

To apply this hotfix, you must have Visual Studio 2010 Service Pack 1 (SP1) installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix if the affected files are not being used. We recommend that you close Visual Studio 2010-related components before you apply this hotfix.

File information

The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

File name

File version

File size

Date

Time

Platform

C2.dll

16.0.40219.419

2,607,184

10-Sep-2012

22:04

x86

C2.dll

16.0.40219.419

2,493,520

11-Sep-2012

21:00

x86

C2.dll

16.0.40219.419

2,959,952

11-Sep-2012

21:00

x64

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Workaround

To work around this issue, use the /Od optimization compiler option to turn off optimization.

More Information

For more information about compiler options, go to the following MSDN website:

General information about compiler options

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