https://github.com/apple/swift/pull/15738 build-script -x で生成した xcodeproj のグループ構成が変わったのは CMake のバージョンによるものでは無かったみたいです。 (edited)

[CMake] Improve Xcode project generation with folders by jrose-app...

Re-enable the use of folders with the USE_FOLDER setting. This got lost a while ago when we stopped including LLVM's top-level CMakeLists.txt. Put a bunch of new targets into folders. Shoul...