Swift_LANGUAGE_VERSION

New in version 3.16.

This property sets the language version for the Swift sources in the target. If one is not specified, it will default to <CMAKE_Swift_LANGUAGE_VERSION> if specified, otherwise it is the latest version supported by the compiler.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/prop_tgt/Swift_LANGUAGE_VERSION.html