# variable_requires

Disallowed since version 3.0. See CMake Policy `CMP0035`.

Use the `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.