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FIX: "C2371," "C2556," or "C2511" error message when you compile a Visual C++ 2010 project

Consider the following scenario:
  • You have a Microsoft Visual C++ project that contains a C++\CLI source file in Microsoft Visual Studio 2010. The source file runs the #import directive against a large type library (.tlb) file.
  • The .tlb file stores information for a COM object that includes a method that contains an enum parameter or an enum return value. For example, the COM object contains the following method:
    void function (enum eType)
  • You enable the /CLR switch for the C++\CLI source file.
  • You try to compile the project in Visual Studio 2010 or by using the command prompt.
In this scenario, the method signature that is generated in a .tli file does not match the method signature that is generated in a .tlh file. Specifically, one of the generated method signatures contains an extraneous "m" character.

For example, the void function (enum eType) method is generated as void function (enum meType) in the .tli file.

Note The .tli file and the .tlh file are generated automatically when you compile the project.

Additionally, you receive one of the following error messages when this issue occurs:
error C2371: '<identifier>' : redefinition; different basic types

error C2556: '<identifier1>' : overloaded function differs only by return type from '<identifier2>'

error C2511: '<identifier>' : overloaded member function not found in '<class>'
This issue is triggered by a problem that occurs when spaces are parsed in large .tlb files.

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

To resolve this problem immediately, 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:Note 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.


To apply this hotfix, you must have Visual Studio Team Foundation Server 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 being used. We recommend that you close all Visual Studio 2010-related components before you install the hotfix.

Hotfix replacement information

This hotfix does not replace a previously released 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 nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Article ID: 2711525 - Last Review: 06/27/2012 09:07:00 - Revision: 2.0

Microsoft Visual Studio 2010 Service Pack 1

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