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