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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 Swdifft, reference master (e92c79), with Swift 6.0 for macOS (SPM) on 31 Oct 2024 16:02:01 UTC.

Swift 6 data race errors: 4

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.56.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/bannzai/swdifft.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/bannzai/swdifft
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at e92c79b Merge pull request #5 from bannzai/enhancement/performance/index
Cloned https://github.com/bannzai/swdifft.git
Revision (git rev-parse @):
e92c79b9da9d2f87b3bfc6411eccf936b72db51e
SUCCESS checkout https://github.com/bannzai/swdifft.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": "swdifft",
      "name": "Swdifft",
      "url": "https://github.com/bannzai/swdifft.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swdifft",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/bannzai/swdifft.git
[1/140] Fetching swdifft
Fetched https://github.com/bannzai/swdifft.git from cache (0.65s)
Creating working copy for https://github.com/bannzai/swdifft.git
Working copy of https://github.com/bannzai/swdifft.git resolved at master (e92c79b)
warning: '.resolve-product-dependencies': dependency 'swdifft' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/bannzai/swdifft.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--7754E27361AE5C74.txt
[3/9] Compiling Swdifft Swdifft.swift
[4/9] Compiling Swdifft StringExtension.swift
[5/9] Compiling Swdifft longestCommonSubsequence.swift
[6/9] Emitting module Swdifft
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:10:12: warning: var 'beginLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public var beginLHSMark = "`"
   |            |- warning: var 'beginLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'beginLHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'beginLHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
11 | public var endLHSMark = "`"
12 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:11:12: warning: var 'endLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 9 |
10 | public var beginLHSMark = "`"
11 | public var endLHSMark = "`"
   |            |- warning: var 'endLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'endLHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'endLHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
12 |
13 | public var beginRHSMark = "*"
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:13:12: warning: var 'beginRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
11 | public var endLHSMark = "`"
12 |
13 | public var beginRHSMark = "*"
   |            |- warning: var 'beginRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'beginRHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'beginRHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
14 | public var endRHSMark = "*"
15 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:14:12: warning: var 'endRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
12 |
13 | public var beginRHSMark = "*"
14 | public var endRHSMark = "*"
   |            |- warning: var 'endRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'endRHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'endRHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |
16 |
[7/9] Compiling Swdifft Marks.swift
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:10:12: warning: var 'beginLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public var beginLHSMark = "`"
   |            |- warning: var 'beginLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'beginLHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'beginLHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
11 | public var endLHSMark = "`"
12 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:11:12: warning: var 'endLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 9 |
10 | public var beginLHSMark = "`"
11 | public var endLHSMark = "`"
   |            |- warning: var 'endLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'endLHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'endLHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
12 |
13 | public var beginRHSMark = "*"
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:13:12: warning: var 'beginRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
11 | public var endLHSMark = "`"
12 |
13 | public var beginRHSMark = "*"
   |            |- warning: var 'beginRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'beginRHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'beginRHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
14 | public var endRHSMark = "*"
15 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:14:12: warning: var 'endRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
12 |
13 | public var beginRHSMark = "*"
14 | public var endRHSMark = "*"
   |            |- warning: var 'endRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'endRHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'endRHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |
16 |
[8/9] Compiling Swdifft InternalDiffFunction.swift
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/InternalDiffFunction.swift:56:33: warning: capture of 'extract(target:commonCharacter:diffWords:beginIndex:)' with non-sendable type '(Content, Character, (begin: String, end: String), inout Int) -> Result' (aka '(String, Character, (begin: String, end: String), inout Int) -> Result') in a `@Sendable` closure; this is an error in the Swift 6 language mode
54 |         DispatchQueue.global().async {
55 |             let r = lcs.reduce("") { (result, commonCharacter) in
56 |                 return result + extract(target: target, commonCharacter: commonCharacter, diffWords: (begin: diffWords.begin, end: diffWords.end), beginIndex: &beginIndex).stack
   |                                 |- warning: capture of 'extract(target:commonCharacter:diffWords:beginIndex:)' with non-sendable type '(Content, Character, (begin: String, end: String), inout Int) -> Result' (aka '(String, Character, (begin: String, end: String), inout Int) -> Result') in a `@Sendable` closure; this is an error in the Swift 6 language mode
   |                                 `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
57 |             }
58 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/InternalDiffFunction.swift:59:13: warning: capture of 'closure' with non-sendable type '(Content) -> ()' (aka '(String) -> ()') in a `@Sendable` closure; this is an error in the Swift 6 language mode
57 |             }
58 |
59 |             closure(r)
   |             |- warning: capture of 'closure' with non-sendable type '(Content) -> ()' (aka '(String) -> ()') in a `@Sendable` closure; this is an error in the Swift 6 language mode
   |             `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
60 |         }
61 |     }
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/InternalDiffFunction.swift:56:33: warning: capture of 'extract(target:commonCharacter:diffWords:beginIndex:)' with non-sendable type '(Content, Character, (begin: String, end: String), inout Int) -> Result' (aka '(String, Character, (begin: String, end: String), inout Int) -> Result') in an isolated closure; this is an error in the Swift 6 language mode
54 |         DispatchQueue.global().async {
55 |             let r = lcs.reduce("") { (result, commonCharacter) in
56 |                 return result + extract(target: target, commonCharacter: commonCharacter, diffWords: (begin: diffWords.begin, end: diffWords.end), beginIndex: &beginIndex).stack
   |                                 |- warning: capture of 'extract(target:commonCharacter:diffWords:beginIndex:)' with non-sendable type '(Content, Character, (begin: String, end: String), inout Int) -> Result' (aka '(String, Character, (begin: String, end: String), inout Int) -> Result') in an isolated closure; this is an error in the Swift 6 language mode
   |                                 `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
57 |             }
58 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/InternalDiffFunction.swift:20:10: warning: concurrently-executed local function 'extract(target:commonCharacter:diffWords:beginIndex:)' must be marked as '@Sendable'; this is an error in the Swift 6 language mode
18 |     }
19 |
20 |     func extract(target: Content, commonCharacter: Character, diffWords: (begin: String, end: String), beginIndex step: inout Int) -> Result {
   |          `- warning: concurrently-executed local function 'extract(target:commonCharacter:diffWords:beginIndex:)' must be marked as '@Sendable'; this is an error in the Swift 6 language mode
21 |         var result = Result()
22 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/InternalDiffFunction.swift:56:161: warning: mutation of captured var 'beginIndex' in concurrently-executing code; this is an error in the Swift 6 language mode
54 |         DispatchQueue.global().async {
55 |             let r = lcs.reduce("") { (result, commonCharacter) in
56 |                 return result + extract(target: target, commonCharacter: commonCharacter, diffWords: (begin: diffWords.begin, end: diffWords.end), beginIndex: &beginIndex).stack
   |                                                                                                                                                                 `- warning: mutation of captured var 'beginIndex' in concurrently-executing code; this is an error in the Swift 6 language mode
57 |             }
58 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:10:12: warning: var 'beginLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 8 | import Foundation
 9 |
10 | public var beginLHSMark = "`"
   |            |- warning: var 'beginLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'beginLHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'beginLHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
11 | public var endLHSMark = "`"
12 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:11:12: warning: var 'endLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 9 |
10 | public var beginLHSMark = "`"
11 | public var endLHSMark = "`"
   |            |- warning: var 'endLHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'endLHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'endLHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
12 |
13 | public var beginRHSMark = "*"
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:13:12: warning: var 'beginRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
11 | public var endLHSMark = "`"
12 |
13 | public var beginRHSMark = "*"
   |            |- warning: var 'beginRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'beginRHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'beginRHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
14 | public var endRHSMark = "*"
15 |
/Users/admin/builder/spi-builder-workspace/Sources/Swdifft/Marks.swift:14:12: warning: var 'endRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
12 |
13 | public var beginRHSMark = "*"
14 | public var endRHSMark = "*"
   |            |- warning: var 'endRHSMark' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: convert 'endRHSMark' to a 'let' constant to make 'Sendable' shared state immutable
   |            |- note: annotate 'endRHSMark' with '@MainActor' if property should only be accessed from the main actor
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
15 |
16 |
[9/9] Compiling Swdifft Formatter.swift
Build complete! (8.06s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Swdifft",
  "name" : "Swdifft",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Swdifft",
      "targets" : [
        "Swdifft"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwdifftTests",
      "module_type" : "SwiftTarget",
      "name" : "SwdifftTests",
      "path" : "Tests/SwdifftTests",
      "sources" : [
        "SwdifftTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Swdifft"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Swdifft",
      "module_type" : "SwiftTarget",
      "name" : "Swdifft",
      "path" : "Sources/Swdifft",
      "product_memberships" : [
        "Swdifft"
      ],
      "sources" : [
        "Formatter.swift",
        "InternalDiffFunction.swift",
        "Marks.swift",
        "StringExtension.swift",
        "Swdifft.swift",
        "longestCommonSubsequence.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.