[CMake] variable_watch and cache variiables

[Dominik Bernhardt]

Hello,

during debugging CMake scripts of a large project I came across the  
very helpful variable_watch command. However it seems not to work for  
cache variables. Is this intended? If so, is there a workaround to  
make it work also for cache variables?

I'm using CMake 2.8.12 on Windows 7.

Dominik