[CMake] getting all the function names

[Andrea Crotti]

I'm starting to use cmake and I will have to rely on it pretty much in 
the future.

I'm a bit overwhelmed by the quantity of variables / functions, is there 
a way
to get an automatic list of all of them?

It would be nice to improve the cmake-mode.el (for emacs) to recognise 
as much as possible,
and propose some completion possibly.

Also a nasty grep of the source code that generates some static list 
might be fine...