How do I turn on multi-CPU/Core C++ compiles in the Visual Studio IDE (2008)?

Question

I have a Visual Studio 2008 C++ project that has support for using multiple CPUs/cores when compiling. In the VCPROJ file I see this:

Answer 1

To enable /MP option you could add it to Project Settings->C/C++->Command Line|Additional options. This is the only way to switch it on in vcproj.