> Well, if ${_var} is already a cache variable, you can retrieve it's
> HELPSTRING property to see what was set as the original doc string. But if
> it's not, then there won't be one, and you'll be adding an undocumented
> option...
>
>
> http://cmake.org/cmake/help/v2.8.9/cmake.html#section_PropertiesonCacheEntries
Thanks Dave, that'll work:
get_property(currentHelpString CACHE "${_var}" PROPERTY HELPSTRING)
set(${_var} OFF CACHE BOOL ${currentHelpString} FORCE)
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