[CMake] Cmake and Visual Studio platforms

[John Drescher]

> There are multiple posts in multiple forums asking this question, so
> naturally there is public need for this feature. How come CMake never aimed
> at creating a solution for this? I suspect there is some great design issue
> that prevents implementing it in CMake. There are several platform and
> generator specific options already inside CMake, why can't this be another
> one?
>
I believe the current method of forcing the developer to use different
build trees for 64bit and 32bit works very well. I have used this for
almost 5 years now of development under Visual Studio 2005 to 2012.

John