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- variable_requires
- -----------------
- Disallowed. See CMake Policy :policy:`CMP0035`.
- Use the :command:`if` command instead.
- Assert satisfaction of an option's required variables.
- ::
- variable_requires(TEST_VARIABLE RESULT_VARIABLE
- REQUIRED_VARIABLE1
- REQUIRED_VARIABLE2 ...)
- The first argument (``TEST_VARIABLE``) is the name of the variable to be
- tested, if that variable is false nothing else is done. If
- ``TEST_VARIABLE`` is true, then the next argument (``RESULT_VARIABLE``)
- is a variable that is set to true if all the required variables are set.
- The rest of the arguments are variables that must be true or not set
- to NOTFOUND to avoid an error. If any are not true, an error is
- reported.
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