configure crossplattform workspace/project

[MoonKid]

I want to know what is the smartes way to create a Code::Blocks project that can compile on different systems.
I found a way but didn't know if it is ok.

There are four build targets configured.

Debug Dynamic (Win32)
Release Static (Win32)
Debug Dynamic (Unix)
Release Static (Unix)

Of course I set the "plattform" value in the properties of the project to Win32 or to Unix.

Is this ok?