Set a name, version, and enable languages for the entire project.

project(<PROJECT-NAME> [LANGUAGES] [<language-name>...])
        [VERSION <major>[.<minor>[.<patch>[.<tweak>]]]]
        [LANGUAGES <language-name>...])

Sets the name of the project and stores the name in the PROJECT_NAME variable. Additionally this sets variables

If VERSION is specified, given components must be non-negative integers. If VERSION is not specified, the default version is the empty string. The VERSION option may not be used unless policy CMP0048 is set to NEW.

The project() command stores the version number and its components in variables

Variables corresponding to unspecified versions are set to the empty string (if policy CMP0048 is set to NEW).

Optionally you can specify which languages your project supports. Example languages are C, CXX (i.e. C++), Fortran, etc. By default C and CXX are enabled if no language options are given. Specify language NONE, or use the LANGUAGES keyword and list no languages, to skip enabling any languages.

If a variable exists called CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE, the file pointed to by that variable will be included as the last step of the project command.

The top-level CMakeLists.txt file for a project must contain a literal, direct call to the project() command; loading one through the include() command is not sufficient. If no such call exists CMake will implicitly add one to the top that enables the default languages (C and CXX).