文件操作 - option.rst
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文件: /usr/share/cmake3/Help/command/option.rst
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option ------ Provide an option that the user can optionally select. .. code-block:: cmake option(<variable> "<help_text>" [value]) Provides an option for the user to select as ``ON`` or ``OFF``. If no initial ``<value>`` is provided, ``OFF`` is used. If ``<variable>`` is already set as a normal variable then the command does nothing (see policy :policy:`CMP0077`). If you have options that depend on the values of other options, see the module help for :module:`CMakeDependentOption`.
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