How to setup project for multiple platforms - iOS, OSX, Win

[petrocket]

I'd like to make a simple Ogre based game that I can run on iOS, OSX and windows (sorry linux) and I'd like some input on the fastest way to get setup.

I was thinking:

• 1 .Download the SDKs for each platform
  2. Create 3 separate folders for each platform
  3. Create "shared" folder for my game code
  4. Modify the sample project for each SDK to use my "shared" folder code.

Is there a better, cleaner, faster way? Any advice?