How to compile Xcode for device with newer iOS version

I always forget how to compile and run my apps on a device with a high OS version than the supported OS of my Xcode - here’s how.

Download

Download the version of Xcode which will compile to the device - I like to use xcversion to manage my Xcodes.
Link (or copy) the iPhoneOS device support file from the download Xcode directory to the current Xcode directory
Restart Xcode

Example

Compile for an 11.1 device on Xcode 10.1

ls -s /Applications/Xcode-13.1.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/13.1 /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/13.1

Note: To save up disk space copy cp rather than link ln the support files. Then delete the entire Xcode-13.3.app folder.