[CMake] need help with modified helloworld

[Andy Dingfelder]

I'm wondering if someone could help me with a simple change to the
helloworld example

I have gotten the helloworld to work with either windows output or
linux output, by changing the base CMakeLists.txt file but am struggling
on how to build both

the current example is set up as follows:

CMakeExample/Hello
CMakeExample/Demo
CMakeExample/Build
CMakeExample/CmakeLists.txt

My goal is to set up my system something like this:

CMakeExample/src/Hello
CMakeExample/src/Demo
CMakeExample/lib     <-- not sure if I need this?
CMakeExample/linuxBuild/CmakeLists.txt
CMakeExample/windowsBuild/CmakeLists.txt

It seems that the only difference between the CmakeLists.txt file for
linux and windows is that the windows one has 
SET(CMAKE_C_COMPILER i686-mingw32-gcc)
SET(CMAKE_CXX_COMPILER i686-mingw32-g++)
while the linux one uses the default

basically I want the helloworld example but running "out of source
directory" 

thoughts?
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