Upgrading Xcode 12 caused Carthage to build cartfile containing only rxswift to fail

Hand owe upgrade Xcode12 Lead to carthage Build only contains RxSwift Of Cartfile Failure

2020 year 9 month 16 Japan Apple Released Xcode12, The previous version was 11.7, We have inherited Apple The consistent tradition of the new version of entrapment , Sure enough, all kinds of collapse after installation , The minimum reproduction code after deletion is as follows .

https://github.com/huzhenghui/swift-awesome/blob/master/carthage/RxSwift/justfile

https://github.com/huzhenghui/swift-awesome/blob/master/carthage/RxSwift/Cartfile

Cartfile Contains only one package

github "ReactiveX/RxSwift" ~> 5.0

Initialize to macOS platform

carthage bootstrap --no-build --verbose --platform macOS --no-use-binaries

Compiled into macOS platform

carthage build --platform macOS --no-use-binaries --verbose

Check the compilation results after the compilation is successful

ls -1 ./Carthage/Build/Mac

Output is

RxBlocking.framework
RxBlocking.framework.dSYM
RxCocoa.framework
RxCocoa.framework.dSYM
RxRelay.framework
RxRelay.framework.dSYM
RxSwift.framework
RxSwift.framework.dSYM
RxTest.framework
RxTest.framework.dSYM

If initialized to iOS platform

carthage bootstrap --no-build --verbose --platform iOS --no-use-binaries

Compiled into iOS platform

carthage build --platform iOS --no-use-binaries --verbose

False report

/usr/bin/xcrun lipo -create ~/Library/Caches/org.carthage.CarthageKit/DerivedData/12.0_12A7209/RxSwift/5.1.1/Build/Intermediates.noindex/ArchiveIntermediates/RxBlocking/IntermediateBuildFilesPath/UninstalledProducts/iphoneos/RxBlocking.framework/RxBlocking ~/Library/Caches/org.carthage.CarthageKit/DerivedData/12.0_12A7209/RxSwift/5.1.1/Build/Products/Release-iphonesimulator/RxBlocking.framework/RxBlocking -output ./Carthage/Build/iOS/RxBlocking.framework/RxBlocking

Blood and tears lesson to remind you ,Apple Products should form the habit of carefully reading the upgrade instructions , The more you upgrade, the more you have to hide .

Xcode 12 includes Swift 5.3 and SDKs for iOS 14, iPadOS 14, tvOS 14, watchOS 7, and macOS Catalina

Platform features
• App Clips are a small part of your app that’s discoverable at the moment it’s needed, loads in seconds, and launches quickly
• WidgetKit uses SwiftUI to build beautiful new widgets that users can install directly on their iPhone home screen
• StoreKit testing framework and transaction manager make it easy to test and debug in-app purchases

Refined user interface
• Document tabs open any type of document in a lightweight editor tab, including logs, asset catalogs, and UI files
• Navigator fonts are now resizable based on the system setting, or can be manually configured
• Code completion has a new, simplified interface that is faster, and makes it easier to choose the correct code
• Organizer is completely redesigned, and reports new app metrics such as hitches in animation and scrolling

Swift and SwiftUI
• Performance for SwiftUI has been improved throughout, and new Lazy views can efficiently handle enormous data sets
• SwiftUI Views can be turned into reusable components that appear in the Xcode library and in code completions
• Swift Package Manager supports resources and localizations, making it great for sharing SwiftUI components
• Swift compiler’s improved diagnostics make it much easier to understand coding mistakes, especially in SwiftUI code