Swift_LANGUAGE_VERSION
Added 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/latest/prop_tgt/Swift_LANGUAGE_VERSION.html
