[CMake] [Insight-developers] 64 bit build detection

[Bill Hoffman]

Michael Jackson wrote:
> And what if you are on a system like OS X where the default build is 32 
> bit but you can have a 64 bit binary built? Then CMAKE_SIZEOF_VOID_P is 
> going to be invalid.
> 
> 
No, it is done with a try compile based on the current compiler settings.

-Bill