How to build Swift Package as XCFramework

[johnno1962 (John Holdsworth)]

There was a useful comment on how to do this using a combination of xcodebuild and scripting to extract the ..swiftinterface files:

Compilation extremely slow since macros adoption

Yes, it can be copied over: name="SwiftSyntaxMacros" platform="macos" xcodebuild archive -scheme ${name} -quiet -configuration Release -destination 'generic/platform=macOS' -archivePath /private/tmp/swift-syntax/${name}-${platform}.xcarchive -derivedDataPath /private/tmp/swift-syntax/${name}-${platform}.derived SKIP_INSTALL=NO BUILD_LIBRARY_FOR_DISTRIBUTION=YES SWIFT_SERIALIZE_DEBUGGING_OPTIONS=NO mkdir -p /private/tmp/swift-syntax/${name}-${platform}.xcarchive/Products/usr/local/lib/${name}.…