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Track the adoption of Swift 6 strict concurrency checks for data race safety. How many packages are Ready for Swift 6?

Build Information

Failed to build AsyncBluetooth, reference 6.0.0 (10c00f), with Swift 5.10 for macOS (SPM) on 5 Apr 2025 21:15:22 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.4.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
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Builder version: 4.60.1
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/manolofdez/AsyncBluetooth.git
Reference: 6.0.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/manolofdez/AsyncBluetooth
 * tag               6.0.0      -> FETCH_HEAD
HEAD is now at 10c00f6 [Feature] Cancel peripheral operations on disconnect (#78)
Cloned https://github.com/manolofdez/AsyncBluetooth.git
Revision (git rev-parse @):
10c00f6d7af8264bc9f4ce1c20a6544dbf6a2147
SUCCESS checkout https://github.com/manolofdez/AsyncBluetooth.git at 6.0.0
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $PWD
https://github.com/manolofdez/AsyncBluetooth.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.4.0.app xcrun swift build --arch arm64
Building for debugging...
[0/3] Write sources
[1/3] Copying PrivacyInfo.xcprivacy
[2/3] Write swift-version-33747A42983211AE.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[4/30] Emitting module AsyncBluetooth
/Users/admin/builder/spi-builder-workspace/Sources/Utils/Extensions/CBUUID+Sendable.swift:6:30: error: unknown attribute 'retroactive'
extension CBUUID: @unchecked @retroactive Sendable {}
                             ^
[5/32] Compiling AsyncBluetooth ThreadSafeArray.swift
[6/32] Compiling AsyncBluetooth resource_bundle_accessor.swift
[7/32] Compiling AsyncBluetooth AsyncBluetooth.swift
[8/32] Compiling AsyncBluetooth CentralManager.swift
[9/32] Compiling AsyncBluetooth CentralManagerContext.swift
[10/32] Compiling AsyncBluetooth Peripheral+ReadWrite.swift
[11/32] Compiling AsyncBluetooth Peripheral.swift
[12/32] Compiling AsyncBluetooth PeripheralContext.swift
[13/32] Compiling AsyncBluetooth Descriptor.swift
[14/32] Compiling AsyncBluetooth Characteristic+DataConversion.swift
[15/32] Compiling AsyncBluetooth CharacteristicValueUpdateData+DataConversion.swift
[16/32] Compiling AsyncBluetooth PeripheralDelegate.swift
[17/32] Compiling AsyncBluetooth Service.swift
[18/32] Compiling AsyncBluetooth AsyncBluetoothLogging.swift
[19/32] Compiling AsyncBluetooth CentralManagerEvent.swift
[20/32] Compiling AsyncBluetooth ScanData.swift
[21/32] Compiling AsyncBluetooth PeripheralDataConvertible.swift
[22/32] Compiling AsyncBluetooth BluetoothError.swift
[23/32] Compiling AsyncBluetooth Characteristic.swift
[24/32] Compiling AsyncBluetooth CharacteristicValueUpdateEventData.swift
[25/32] Compiling AsyncBluetooth AsyncExecutorMap.swift
[26/32] Compiling AsyncBluetooth AsyncSerialExecutor.swift
[27/32] Compiling AsyncBluetooth AsyncSerialExecutorConstants.swift
[28/32] Compiling AsyncBluetooth CallbackUtils.swift
[29/32] Compiling AsyncBluetooth CentralManagerUtils.swift
[30/32] Compiling AsyncBluetooth AsyncExecutor+Flushable.swift
[31/32] Compiling AsyncBluetooth CBUUID+Sendable.swift
/Users/admin/builder/spi-builder-workspace/Sources/Utils/Extensions/CBUUID+Sendable.swift:6:30: error: unknown attribute 'retroactive'
extension CBUUID: @unchecked @retroactive Sendable {}
                             ^
[32/32] Compiling AsyncBluetooth FlushableExecutor.swift
/Users/admin/builder/spi-builder-workspace/Sources/Utils/Extensions/CBUUID+Sendable.swift:6:30: error: unknown attribute 'retroactive'
extension CBUUID: @unchecked @retroactive Sendable {}
                             ^
error: fatalError
BUILD FAILURE 5.10 macosSpm