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/GR (Enable Run-Time Type Information)

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Adds code to check object types at run time.

/GR[-]

Remarks

When /GR is on, the compiler defines the _CPPRTTI preprocessor macro. By default, /GR is on in Visual C++ 2005. /GR- disables run-time type information.

Use /GR if the compiler cannot statically resolve an object type in your code. You usually need the /GR option when your code uses dynamic_cast Operator or typeid. However, /GR increases the size of the .rdata sections of your image. If your code does not use dynamic_cast or typeid, /GR- may produce a smaller image.

For more information about run-time type checking, see Run-Time Type Information in the C++ Language Reference.

To set this compiler option in the Visual Studio development environment

  1. Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.

  2. Click the C/C++ folder.

  3. Click the Language property page.

  4. Modify the Enable Run-Time Type Info property.

To set this compiler option programmatically

See Also

Reference

Compiler Options

Setting Compiler Options

Change History

Date

History

Reason

September 2008

Specified when an application needs this compiler option.

Content bug fix.