1CMAKE_Swift_LANGUAGE_VERSION 2---------------------------- 3 4.. versionadded:: 3.7 5 6Set to the Swift language version number. If not set, the oldest legacy 7version known to be available in the host Xcode version is assumed: 8 9* Swift ``4.0`` for Xcode 10.2 and above. 10* Swift ``3.0`` for Xcode 8.3 and above. 11* Swift ``2.3`` for Xcode 8.2 and below. 12