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option
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------
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Provide a boolean option that the user can optionally select.
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.. code-block:: cmake
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option(<variable> "<help_text>" [value])
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If no initial ``<value>`` is provided, boolean ``OFF`` is the default value.
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If ``<variable>`` is already set as a normal or cache variable,
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then the command does nothing (see policy :policy:`CMP0077`).
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For options that depend on the values of other options, see
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the module help for :module:`CMakeDependentOption`.
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In CMake project mode, a boolean cache variable is created with the option
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value. In CMake script mode, a boolean variable is set with the option value.
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