[CMake] Removing unused variables from the cache

[Peter Soetens]

Hi,

Is it possible to remove variables from the cache ? For example:

OPTION( BUILD_X "Descr" OFF )

IF ( BUILD_X )
    SET( SOME_OPTION "Hello world" CACHE)
ELSEIF (BUILD_X)
    UNSET( SOME_OPTION )
ENDIF ( BUILD_X )

Peter
-- 
Peter Soetens -- FMTC -- <http://www.fmtc.be>