[Paraview] How to change C++ compiler and keep cache?

[pratik]

When i try to change my compiler from g++ to mpic++, ccmake says the 
cache needs to be regenerated. Although, i can complete the 
configuration and get the makefiles for that seesion (and even build PV! 
But did that have my options enabled? i dunno..) when i open the cahce 
it has been reset to its default values. How can i prevent this?(i.e 
save the configuration?)
I was actually trying to check my CMakeCache.txt in response to another 
post of mine when i realised this....