Symptoms
Assume that you compile a C or C++ source code file to an x64-based binary file by using the Visual C/C++ compiler (Cl.exe) in Microsoft Visual Studio 2010. The source code file contains a function that uses a switch statement. In this situation, incorrect machine code may be generated for the switch statement if the following conditions are true:
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The /Ob1 (Only_inline) compiler option is enabled.
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The /O1 (Minimize Size), /O2 (Maximize Speed), /Ox (Full Optimization), or /Og (Global Optimizations) optimization compiler option is enabled.
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The /GL (Whole Program Optimization) compiler option is disabled.
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.
