kenji21/xcode-previous-older-sdks.md

## xcode-previous-older-sdks.md

      
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              xcode-previous-older-sdks.md
            
          
    Use previous/older SDKs with Xcode

Since monterey update does not allow us to use Xcode previous than 13, let's show how to "install previous SDKs"
Needed

Swift toolchains, from https://swift.org/download/
Previous Xcode.xip, from the https://developer.apple.com
Quit Xcode
Copying older SDKs into the latest Xcode

Note: sudo is only needed if you have installed Xcode from the Mac App Store
% sudo cp -a /Applications/Xcode_12.4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.4.sdk
% sudo cp -a /Applications/Xcode_12.4.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.4.sdk

% sudo cp -a /Applications/Xcode_12.5.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk
% sudo cp -a /Applications/Xcode_12.5.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.5.sdk

Then, let's list them :
% xcodebuild -showsdks
2021-10-26 14:52:25.564 xcodebuild[84599:187956] [MT] DVTSDK: Skipped SDK /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.4.sdk; its version (14.4) is below required minimum (15.0) for the iphonesimulator platform.
2021-10-26 14:52:25.564 xcodebuild[84599:187956] [MT] DVTSDK: Skipped SDK /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.5.sdk; its version (14.5) is below required minimum (15.0) for the iphonesimulator platform.

Ok, we need to lower the MinimumSDKVersion:
% /usr/libexec/PlistBuddy -c "Print :MinimumSDKVersion" /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Info.plist
15.0
% sudo /usr/libexec/PlistBuddy -c "Set :MinimumSDKVersion 14.4" /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Info.plist

Then :
% xcodebuild -version
Xcode 13.1
Build version 13A1030d
% xcodebuild -showsdks
DriverKit SDKs:
	DriverKit 21.0.1              	-sdk driverkit21.0.1

iOS SDKs:
	iOS 14.4                      	-sdk iphoneos14.4
	iOS 14.5                      	-sdk iphoneos14.5
	iOS 15.0                      	-sdk iphoneos15.0

iOS Simulator SDKs:
	Simulator - iOS 14.4          	-sdk iphonesimulator14.4
	Simulator - iOS 14.5          	-sdk iphonesimulator14.5
	Simulator - iOS 15.0          	-sdk iphonesimulator15.0

macOS SDKs:
	macOS 12.0                    	-sdk macosx12.0

tvOS SDKs:
	tvOS 15.0                     	-sdk appletvos15.0

tvOS Simulator SDKs:
	Simulator - tvOS 15.0         	-sdk appletvsimulator15.0

watchOS SDKs:
	watchOS 8.0                   	-sdk watchos8.0

watchOS Simulator SDKs:
	Simulator - watchOS 8.0       	-sdk watchsimulator8.0

And relaunch Xcode, and you will be able to choose in the "Base SDK" (akka SDKROOT) build setting of your project:

iOS (15, provided by Xcode, choose default toolchain in Xcode preferences, or Xcode menu -> Toolchains)
iOS 14.4 (choose swift 5.3.2 toolchain)
iOS 14.5 (choose swift 5.4.3 toolchain)

of course it also works for macOS SDKs
References

Thanks to :
https://developer.apple.com/forums/thread/43381
https://stackoverflow.com/questions/1480184/how-do-i-determine-which-ios-sdk-i-have/19377753#19377753