_DESCRIPTION

From Get docs
Cmake/docs/3.21/variable/project-name description


_DESCRIPTION

New in version 3.12.


Value given to the DESCRIPTION option of the most recent call to the project() command with project name <PROJECT-NAME>, if any.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/variable/PROJECT-NAME_DESCRIPTION.html