The as(1) driver will remain, as a standard way to invoke Clang’s integrated assembler, as well as any assemblers installed by the developer. Using the as command with the -Q flag shows a warning that instructs you to transition to Clang’s integrated assembler and the -q flag.
The stand-alone system assemblers for i386, x86_64, and arm are deprecated and may be removed in a future Xcode release. Xcode 12 beta 4 requires Apple silicon running macOS Big Sur 11 beta or later, or an Intel-based Mac running macOS Catalina 10.15.4 or later. The Xcode 12 beta 4 release supports on-device debugging for iOS 9 and later, tvOS 9 and later, and watchOS 2 and later. Xcode 12 beta 4 includes SDKs for iOS 14, iPadOS 14, tvOS 14, watchOS 7, and macOS 11. 
Update your apps to use new features, and test your apps against API changes.
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