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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 DictionaryEncoder, reference master (87eef9), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 11:28:05 UTC.

Swift 6 data race errors: 3

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/adam-fowler/dictionary-encoder.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/adam-fowler/dictionary-encoder
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 87eef97 Travis config update
Cloned https://github.com/adam-fowler/dictionary-encoder.git
Revision (git rev-parse @):
87eef97292dc2f058e02a1d4b30c9419e1c99e72
SUCCESS checkout https://github.com/adam-fowler/dictionary-encoder.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": "dictionary-encoder",
      "name": "DictionaryEncoder",
      "url": "https://github.com/adam-fowler/dictionary-encoder.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/dictionary-encoder",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/adam-fowler/dictionary-encoder.git
[1/36] Fetching dictionary-encoder
Fetched https://github.com/adam-fowler/dictionary-encoder.git from cache (0.66s)
Creating working copy for https://github.com/adam-fowler/dictionary-encoder.git
Working copy of https://github.com/adam-fowler/dictionary-encoder.git resolved at master (87eef97)
warning: '.resolve-product-dependencies': dependency 'dictionary-encoder' 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/adam-fowler/dictionary-encoder.git
https://github.com/adam-fowler/dictionary-encoder.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DictionaryEncoder",
  "name" : "DictionaryEncoder",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "DictionaryEncoder",
      "targets" : [
        "DictionaryEncoder"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "DictionaryEncoderTests",
      "module_type" : "SwiftTarget",
      "name" : "DictionaryEncoderTests",
      "path" : "Tests/DictionaryEncoderTests",
      "sources" : [
        "DictionaryEncoderTests.swift"
      ],
      "target_dependencies" : [
        "DictionaryEncoder"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DictionaryEncoder",
      "module_type" : "SwiftTarget",
      "name" : "DictionaryEncoder",
      "path" : "Sources/DictionaryEncoder",
      "product_memberships" : [
        "DictionaryEncoder"
      ],
      "sources" : [
        "DictionaryEncoder.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
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
[3/4] Emitting module DictionaryEncoder
/Users/admin/builder/spi-builder-workspace/Sources/DictionaryEncoder/DictionaryEncoder.swift:75:27: warning: static property 'prettyPrinted' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
  63 |
  64 |     /// The formatting of the output dictionary data.
  65 |     public struct OutputFormatting : OptionSet {
     |                   `- note: consider making struct 'OutputFormatting' conform to the 'Sendable' protocol
  66 |         /// The format's default value.
  67 |         public let rawValue: UInt
     :
  73 |
  74 |         /// Produce human-readable text in dictionary with indented output.
  75 |         public static let prettyPrinted = OutputFormatting(rawValue: 1 << 0)
     |                           |- warning: static property 'prettyPrinted' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
     |                           |- note: add '@MainActor' to make static property 'prettyPrinted' part of global actor 'MainActor'
     |                           `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  76 |
  77 |         /// Produce JSON with dictionary keys sorted in lexicographic order.
/Users/admin/builder/spi-builder-workspace/Sources/DictionaryEncoder/DictionaryEncoder.swift:79:27: warning: static property 'sortedKeys' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
  63 |
  64 |     /// The formatting of the output dictionary data.
  65 |     public struct OutputFormatting : OptionSet {
     |                   `- note: consider making struct 'OutputFormatting' conform to the 'Sendable' protocol
  66 |         /// The format's default value.
  67 |         public let rawValue: UInt
     :
  77 |         /// Produce JSON with dictionary keys sorted in lexicographic order.
  78 |         @available(macOS 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *)
  79 |         public static let sortedKeys    = OutputFormatting(rawValue: 1 << 1)
     |                           |- warning: static property 'sortedKeys' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
     |                           |- note: add '@MainActor' to make static property 'sortedKeys' part of global actor 'MainActor'
     |                           `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  80 |     }
  81 |
/Users/admin/builder/spi-builder-workspace/Sources/DictionaryEncoder/DictionaryEncoder.swift:2545:17: warning: var '_iso8601Formatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
2543 | // NOTE: This value is implicitly lazy and _must_ be lazy. We're compiled against the latest SDK (w/ ISO8601DateFormatter), but linked against whichever Foundation the user has. ISO8601DateFormatter might not exist, so we better not hit this code path on an older OS.
2544 | @available(macOS 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
2545 | fileprivate var _iso8601Formatter: ISO8601DateFormatter = {
     |                 |- warning: var '_iso8601Formatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
     |                 |- note: convert '_iso8601Formatter' to a 'let' constant to make 'Sendable' shared state immutable
     |                 |- note: add '@MainActor' to make var '_iso8601Formatter' part of global actor 'MainActor'
     |                 `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
2546 |     let formatter = ISO8601DateFormatter()
2547 |     formatter.formatOptions = .withInternetDateTime
[4/4] Compiling DictionaryEncoder DictionaryEncoder.swift
/Users/admin/builder/spi-builder-workspace/Sources/DictionaryEncoder/DictionaryEncoder.swift:75:27: warning: static property 'prettyPrinted' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
  63 |
  64 |     /// The formatting of the output dictionary data.
  65 |     public struct OutputFormatting : OptionSet {
     |                   `- note: consider making struct 'OutputFormatting' conform to the 'Sendable' protocol
  66 |         /// The format's default value.
  67 |         public let rawValue: UInt
     :
  73 |
  74 |         /// Produce human-readable text in dictionary with indented output.
  75 |         public static let prettyPrinted = OutputFormatting(rawValue: 1 << 0)
     |                           |- warning: static property 'prettyPrinted' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
     |                           |- note: add '@MainActor' to make static property 'prettyPrinted' part of global actor 'MainActor'
     |                           `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  76 |
  77 |         /// Produce JSON with dictionary keys sorted in lexicographic order.
/Users/admin/builder/spi-builder-workspace/Sources/DictionaryEncoder/DictionaryEncoder.swift:79:27: warning: static property 'sortedKeys' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
  63 |
  64 |     /// The formatting of the output dictionary data.
  65 |     public struct OutputFormatting : OptionSet {
     |                   `- note: consider making struct 'OutputFormatting' conform to the 'Sendable' protocol
  66 |         /// The format's default value.
  67 |         public let rawValue: UInt
     :
  77 |         /// Produce JSON with dictionary keys sorted in lexicographic order.
  78 |         @available(macOS 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *)
  79 |         public static let sortedKeys    = OutputFormatting(rawValue: 1 << 1)
     |                           |- warning: static property 'sortedKeys' is not concurrency-safe because non-'Sendable' type 'DictionaryEncoder.OutputFormatting' may have shared mutable state; this is an error in the Swift 6 language mode
     |                           |- note: add '@MainActor' to make static property 'sortedKeys' part of global actor 'MainActor'
     |                           `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  80 |     }
  81 |
/Users/admin/builder/spi-builder-workspace/Sources/DictionaryEncoder/DictionaryEncoder.swift:2545:17: warning: var '_iso8601Formatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
2543 | // NOTE: This value is implicitly lazy and _must_ be lazy. We're compiled against the latest SDK (w/ ISO8601DateFormatter), but linked against whichever Foundation the user has. ISO8601DateFormatter might not exist, so we better not hit this code path on an older OS.
2544 | @available(macOS 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
2545 | fileprivate var _iso8601Formatter: ISO8601DateFormatter = {
     |                 |- warning: var '_iso8601Formatter' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
     |                 |- note: convert '_iso8601Formatter' to a 'let' constant to make 'Sendable' shared state immutable
     |                 |- note: add '@MainActor' to make var '_iso8601Formatter' part of global actor 'MainActor'
     |                 `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
2546 |     let formatter = ISO8601DateFormatter()
2547 |     formatter.formatOptions = .withInternetDateTime
Build complete! (5.42s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DictionaryEncoder",
  "name" : "DictionaryEncoder",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "DictionaryEncoder",
      "targets" : [
        "DictionaryEncoder"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "DictionaryEncoderTests",
      "module_type" : "SwiftTarget",
      "name" : "DictionaryEncoderTests",
      "path" : "Tests/DictionaryEncoderTests",
      "sources" : [
        "DictionaryEncoderTests.swift"
      ],
      "target_dependencies" : [
        "DictionaryEncoder"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DictionaryEncoder",
      "module_type" : "SwiftTarget",
      "name" : "DictionaryEncoder",
      "path" : "Sources/DictionaryEncoder",
      "product_memberships" : [
        "DictionaryEncoder"
      ],
      "sources" : [
        "DictionaryEncoder.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.