[CMake] Removing unused variables from the cache

[Peter Soetens]

Quoting Brad King <brad.king at kitware.com>:
>
> If BUILD_X is on and SOME_OPTION is set by the user, then BUILD_X is
> turned off, and then back on the user may expect SOME_OPTION to have
> retained its value.  You can convert it to an INTERNAL cache entry so
> that it does not show up in the GUI when it is not needed and then use
> FORCE to change its type back later.  Here is an example macro to do
> that for on/off sub-options:
>
> http://www.vtk.org/cgi-bin/viewcvs.cgi/CMake/vtkDependentOption.cmake?rev=1.5&view=markup

Thank you very much for this link ! It is this kind of 'high level' 
macro's that I'm missing most in 'standard' cmake.

Peter

-- 
www.fmtc.be


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