endfunction

Ends a list of commands in a function block.

endfunction([<name>])

See the function() command.

The optional <name> argument is supported for backward compatibility only. If used it must be a verbatim repeat of the <name> argument of the opening function command.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.17/command/endfunction.html