CMAKE_Swift_LANGUAGE_VERSIONΒΆ
Added in version 3.7.
Set to the Swift language version number. If not set, the oldest legacy version known to be available in the host Xcode version is assumed:
Swift
4.0
for Xcode 10.2 and above.Swift
3.0
for Xcode 8.3 and above.Swift
2.3
for Xcode 8.2 and below.