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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

Successful build of Bits, reference master (030794), with Swift 6.1 for macOS (SPM) on 28 Apr 2025 06:28:55 UTC.

Swift 6 data race errors: 2

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/vapor-community/bits.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/vapor-community/bits
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 0307947 Merge pull request #21 from vapor-community/warnings
Cloned https://github.com/vapor-community/bits.git
Revision (git rev-parse @):
03079476b04139a8b744ad96f975176df5ae12bc
SUCCESS checkout https://github.com/vapor-community/bits.git at master
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "bits",
      "name": "Bits",
      "url": "https://github.com/vapor-community/bits.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/bits",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/vapor-community/bits.git
[1/358] Fetching bits
Fetched https://github.com/vapor-community/bits.git from cache (0.57s)
Creating working copy for https://github.com/vapor-community/bits.git
Working copy of https://github.com/vapor-community/bits.git resolved at master (0307947)
warning: '.resolve-product-dependencies': dependency 'bits' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/vapor-community/bits.git
https://github.com/vapor-community/bits.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Bits",
  "name" : "Bits",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Bits",
      "targets" : [
        "Bits"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "BitsTests",
      "module_type" : "SwiftTarget",
      "name" : "BitsTests",
      "path" : "Tests/BitsTests",
      "sources" : [
        "AlphabetTests.swift",
        "ByteTests.swift",
        "BytesTests.swift",
        "ControlCharacterTests.swift",
        "PatternMatchingTests.swift",
        "UnsignedIntegerTests.swift"
      ],
      "target_dependencies" : [
        "Bits"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Bits",
      "module_type" : "SwiftTarget",
      "name" : "Bits",
      "path" : "Sources/Bits",
      "product_memberships" : [
        "Bits"
      ],
      "sources" : [
        "Aliases.swift",
        "Base64Encoder.swift",
        "Byte+Alphabet.swift",
        "Byte+ControlCharacters.swift",
        "Byte+Convenience.swift",
        "Byte+PatternMatching.swift",
        "Byte+Random.swift",
        "Byte+UTF8Numbers.swift",
        "ByteSequence+Conversions.swift",
        "Bytes+Base64.swift",
        "Bytes+Hex.swift",
        "Bytes+Percent.swift",
        "BytesConvertible.swift",
        "Data+BytesConvertible.swift",
        "HexEncoder.swift",
        "Operators.swift",
        "String+BytesConvertible.swift",
        "UnsignedInteger+BytesConvertible.swift",
        "UnsignedInteger+Shifting.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/21] Compiling Bits String+BytesConvertible.swift
[4/21] Compiling Bits UnsignedInteger+BytesConvertible.swift
[5/22] Compiling Bits UnsignedInteger+Shifting.swift
[6/22] Compiling Bits Byte+Random.swift
[7/22] Compiling Bits Byte+UTF8Numbers.swift
[8/22] Compiling Bits ByteSequence+Conversions.swift
[9/22] Compiling Bits Bytes+Base64.swift
[10/22] Compiling Bits Byte+Convenience.swift
[11/22] Compiling Bits Byte+PatternMatching.swift
[12/22] Compiling Bits HexEncoder.swift
/Users/admin/builder/spi-builder-workspace/Sources/Bits/HexEncoder.swift:26:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'HexEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
  3 | ///
  4 | /// https://en.wikipedia.org/wiki/Hexadecimal
  5 | public final class HexEncoder {
    |                    `- note: class 'HexEncoder' does not conform to the 'Sendable' protocol
  6 |     /// Maps binary format to hex encoding
  7 |     static let encodingTable: [Byte: Byte] = [
    :
 24 |
 25 |     /// Static shared instance
 26 |     public static let shared = HexEncoder()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'HexEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 27 |
 28 |     /// When true, the encoder will discard
[13/22] Compiling Bits Operators.swift
/Users/admin/builder/spi-builder-workspace/Sources/Bits/HexEncoder.swift:26:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'HexEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
  3 | ///
  4 | /// https://en.wikipedia.org/wiki/Hexadecimal
  5 | public final class HexEncoder {
    |                    `- note: class 'HexEncoder' does not conform to the 'Sendable' protocol
  6 |     /// Maps binary format to hex encoding
  7 |     static let encodingTable: [Byte: Byte] = [
    :
 24 |
 25 |     /// Static shared instance
 26 |     public static let shared = HexEncoder()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'HexEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 27 |
 28 |     /// When true, the encoder will discard
[14/22] Compiling Bits Aliases.swift
/Users/admin/builder/spi-builder-workspace/Sources/Bits/Base64Encoder.swift:8:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'Base64Encoder' may have shared mutable state; this is an error in the Swift 6 language mode
  3 | ///
  4 | /// https://en.wikipedia.org/wiki/Base64
  5 | public final class Base64Encoder {
    |                    `- note: class 'Base64Encoder' does not conform to the 'Sendable' protocol
  6 |
  7 |     /// Static shared instance
  8 |     public static let shared = Base64Encoder.regular
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'Base64Encoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  9 |
 10 |     /// Standard Base64Encoder
[15/22] Compiling Bits Base64Encoder.swift
/Users/admin/builder/spi-builder-workspace/Sources/Bits/Base64Encoder.swift:8:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'Base64Encoder' may have shared mutable state; this is an error in the Swift 6 language mode
  3 | ///
  4 | /// https://en.wikipedia.org/wiki/Base64
  5 | public final class Base64Encoder {
    |                    `- note: class 'Base64Encoder' does not conform to the 'Sendable' protocol
  6 |
  7 |     /// Static shared instance
  8 |     public static let shared = Base64Encoder.regular
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'Base64Encoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  9 |
 10 |     /// Standard Base64Encoder
[16/22] Compiling Bits BytesConvertible.swift
/Users/admin/builder/spi-builder-workspace/Sources/Bits/Data+BytesConvertible.swift:6:22: warning: initialization of 'UnsafeMutableBufferPointer<Byte>' (aka 'UnsafeMutableBufferPointer<UInt8>') results in a dangling buffer pointer
 4 |     public func makeBytes() -> Bytes {
 5 |         var array = Bytes(repeating: 0, count: count)
 6 |         let buffer = UnsafeMutableBufferPointer(start: &array, count: count)
   |                      |                                 |- note: implicit argument conversion from 'Bytes' (aka 'Array<UInt8>') to 'UnsafeMutablePointer<Byte>?' (aka 'Optional<UnsafeMutablePointer<UInt8>>') produces a pointer valid only for the duration of the call to 'init(start:count:)'
   |                      |                                 `- note: use the 'withUnsafeMutableBufferPointer' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
   |                      `- warning: initialization of 'UnsafeMutableBufferPointer<Byte>' (aka 'UnsafeMutableBufferPointer<UInt8>') results in a dangling buffer pointer
 7 |         _ = copyBytes(to: buffer)
 8 |         return array
[17/22] Compiling Bits Data+BytesConvertible.swift
/Users/admin/builder/spi-builder-workspace/Sources/Bits/Data+BytesConvertible.swift:6:22: warning: initialization of 'UnsafeMutableBufferPointer<Byte>' (aka 'UnsafeMutableBufferPointer<UInt8>') results in a dangling buffer pointer
 4 |     public func makeBytes() -> Bytes {
 5 |         var array = Bytes(repeating: 0, count: count)
 6 |         let buffer = UnsafeMutableBufferPointer(start: &array, count: count)
   |                      |                                 |- note: implicit argument conversion from 'Bytes' (aka 'Array<UInt8>') to 'UnsafeMutablePointer<Byte>?' (aka 'Optional<UnsafeMutablePointer<UInt8>>') produces a pointer valid only for the duration of the call to 'init(start:count:)'
   |                      |                                 `- note: use the 'withUnsafeMutableBufferPointer' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
   |                      `- warning: initialization of 'UnsafeMutableBufferPointer<Byte>' (aka 'UnsafeMutableBufferPointer<UInt8>') results in a dangling buffer pointer
 7 |         _ = copyBytes(to: buffer)
 8 |         return array
[18/22] Compiling Bits Byte+Alphabet.swift
[19/22] Compiling Bits Byte+ControlCharacters.swift
[20/22] Emitting module Bits
/Users/admin/builder/spi-builder-workspace/Sources/Bits/Base64Encoder.swift:8:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'Base64Encoder' may have shared mutable state; this is an error in the Swift 6 language mode
  3 | ///
  4 | /// https://en.wikipedia.org/wiki/Base64
  5 | public final class Base64Encoder {
    |                    `- note: class 'Base64Encoder' does not conform to the 'Sendable' protocol
  6 |
  7 |     /// Static shared instance
  8 |     public static let shared = Base64Encoder.regular
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'Base64Encoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  9 |
 10 |     /// Standard Base64Encoder
/Users/admin/builder/spi-builder-workspace/Sources/Bits/HexEncoder.swift:26:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'HexEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
  3 | ///
  4 | /// https://en.wikipedia.org/wiki/Hexadecimal
  5 | public final class HexEncoder {
    |                    `- note: class 'HexEncoder' does not conform to the 'Sendable' protocol
  6 |     /// Maps binary format to hex encoding
  7 |     static let encodingTable: [Byte: Byte] = [
    :
 24 |
 25 |     /// Static shared instance
 26 |     public static let shared = HexEncoder()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'HexEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 27 |
 28 |     /// When true, the encoder will discard
[21/22] Compiling Bits Bytes+Hex.swift
[22/22] Compiling Bits Bytes+Percent.swift
Build complete! (4.46s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Bits",
  "name" : "Bits",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Bits",
      "targets" : [
        "Bits"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "BitsTests",
      "module_type" : "SwiftTarget",
      "name" : "BitsTests",
      "path" : "Tests/BitsTests",
      "sources" : [
        "AlphabetTests.swift",
        "ByteTests.swift",
        "BytesTests.swift",
        "ControlCharacterTests.swift",
        "PatternMatchingTests.swift",
        "UnsignedIntegerTests.swift"
      ],
      "target_dependencies" : [
        "Bits"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Bits",
      "module_type" : "SwiftTarget",
      "name" : "Bits",
      "path" : "Sources/Bits",
      "product_memberships" : [
        "Bits"
      ],
      "sources" : [
        "Aliases.swift",
        "Base64Encoder.swift",
        "Byte+Alphabet.swift",
        "Byte+ControlCharacters.swift",
        "Byte+Convenience.swift",
        "Byte+PatternMatching.swift",
        "Byte+Random.swift",
        "Byte+UTF8Numbers.swift",
        "ByteSequence+Conversions.swift",
        "Bytes+Base64.swift",
        "Bytes+Hex.swift",
        "Bytes+Percent.swift",
        "BytesConvertible.swift",
        "Data+BytesConvertible.swift",
        "HexEncoder.swift",
        "Operators.swift",
        "String+BytesConvertible.swift",
        "UnsignedInteger+BytesConvertible.swift",
        "UnsignedInteger+Shifting.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Done.