Cross platform compilation CMake - Toolchain? Multiple run configurations?

Hello

I am interested in cross-platform compilation of my project. I am on a Mac, and would like to produce dylib, so, and dll .

I know this can be done with CMake, but I wanted to reach out to the community and see if anyone has already tackled this. Anybody have a toolchain for this? A way to do it with multiple run configurations?

Thanks very much in advance.