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/Od (Disable (Debug))
Turns off all optimizations in the program and speeds compilation.
This option is the default. Because /Od suppresses code movement, it simplifies the debugging process. For more information about compiler options for debugging, see /Z7, /Zi, /ZI (Debug Information Format).
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.
Click the C/C++ folder.
Click the Optimization property page.
Modify the Optimization property.
To set this compiler option programmatically