[CMake] How to force value to cache variable without retyping doc string?

[Robert Dailey]

There is a one-time operation I need CMake to perform the very first time a
user generates. This operation involves copying several files from a remote
server (third party libraries) and placing them in the binary dir.

Right now I'm attempting to do this via a cache variable:

set( COPY_DONE false CACHE BOOL "This is my documentation" )
if( NOT COPY_DONE )
    ....... do work ........
    set( COPY_DONE true )
endif()

I do not make this an INTERNAL cache variable because at any time the user
should be able to set COPY_DONE to false manually and it should recopy
everything, and then set it back to 'true'.

The code above does not work because I'm not using set( COPY_DONE true
............ FORCE ). But I have to resupply the docstring if I do it this
way.

Am I going about this the wrong way? Can anyone recommend a different
approach? If not, how can I do this without having to duplicate the doc
string?

---------
Robert Dailey
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