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option
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------
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Provides an option that the user can optionally select.
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::
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option(<option_variable> "help string describing option"
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[initial value])
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Provide an option for the user to select as ``ON`` or ``OFF``. If no
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initial value is provided, ``OFF`` is used. If the option is already
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set as a normal variable then the command does nothing
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(see policy :policy:`CMP0077`).
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If you have options that depend on the values of other options, see
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the module help for :module:`CMakeDependentOption`.
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