[CMake] Is it possible to define a custom help message?

[Cedric Doucet]

Hello, 

when one types 'cmake -help', one gets a message containing a summary of all available options to the cmake command. 
Is it possible to customize this message, so as to print a description of all useful variables and all options defined by the option command? 

Thank you for your help! 

Cédric 
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