option

Provide a boolean option that the user can optionally select.

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 CMP0077).

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.

See Also

• The CMakeDependentOption module to specify boolean options that depend on the values of other options or a set of conditions.