/Wp64 is off by default in the Visual C++ 32-bit compiler and on by default in the Visual C++ 64-bit compiler.
Variables of the following types are tested on a 32-bit operating system as if they were being used on a 64-bit operating system:
If you regularly compile your application with a 64-bit compiler, you may want to disable /Wp64 in your 32-bit compilations, as the 64-bit compiler will detect all issues. For more information about targeting a Windows 64-bit operating system, see 64-Bit Programming with Visual C++.
To set this compiler option in the Visual Studio development environment
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Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.
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Click the C/C++ folder.
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Click the General property page.
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Modify the Detect 64-bit Portability Issues property.
To set this compiler option programmatically