CMAKE_PROJECT_VERSION_MAJOR

New in version 3.12.

The major version of the top level project.

This variable holds the major version of the project as specified in the top level CMakeLists.txt file by a project() command. Please see CMAKE_PROJECT_VERSION documentation for the behavior when multiple project() commands are used in the sources.

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https://cmake.org/cmake/help/v3.19/variable/CMAKE_PROJECT_VERSION_MAJOR.html