Используется при сборке XCode (iPhone) или Eclipse (Android) проектов.
On iOS, this setting will append an existing Xcode project. Existing Xcode project setting changes will be preserved. With the IL2CPP scripting backend, this setting will also allow incremental builds of the generated C++ code to work in Xcode.
On Android, this setting will create a new Eclipse project. Existing Eclipse project setting changes will be discarded.
See Also: BuildPipeline.BuildPlayer.