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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 CommandLine, reference master (9b5611), with Swift 6.1 for macOS (SPM) on 26 Apr 2025 09:44:35 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/davidskrundz/commandline.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/davidskrundz/commandline
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 9b56116 Swift 5 update
Cloned https://github.com/davidskrundz/commandline.git
Revision (git rev-parse @):
9b56116871b5cbd9f81455ab639fa1705efb5ac8
SUCCESS checkout https://github.com/davidskrundz/commandline.git at master
Fetching https://github.com/DavidSkrundz/Collections.git
[1/203] Fetching collections
Fetched https://github.com/DavidSkrundz/Collections.git from cache (0.57s)
Computing version for https://github.com/DavidSkrundz/Collections.git
Computed https://github.com/DavidSkrundz/Collections.git at 2.0.0 (1.17s)
Creating working copy for https://github.com/DavidSkrundz/Collections.git
Working copy of https://github.com/DavidSkrundz/Collections.git resolved at 2.0.0
========================================
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": "commandline",
      "name": "CommandLine",
      "url": "https://github.com/davidskrundz/commandline.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/commandline",
      "dependencies": [
        {
          "identity": "collections",
          "name": "Collections",
          "url": "https://github.com/DavidSkrundz/Collections.git",
          "version": "2.0.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Collections",
          "dependencies": [
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/davidskrundz/commandline.git
[4/178] Fetching commandline
Fetched https://github.com/davidskrundz/commandline.git from cache (0.57s)
Fetching https://github.com/DavidSkrundz/Collections.git from cache
Fetched https://github.com/DavidSkrundz/Collections.git from cache (0.39s)
Computing version for https://github.com/DavidSkrundz/Collections.git
Computed https://github.com/DavidSkrundz/Collections.git at 2.0.0 (0.44s)
Creating working copy for https://github.com/DavidSkrundz/Collections.git
Working copy of https://github.com/DavidSkrundz/Collections.git resolved at 2.0.0
Creating working copy for https://github.com/davidskrundz/commandline.git
Working copy of https://github.com/davidskrundz/commandline.git resolved at master (9b56116)
warning: '.resolve-product-dependencies': dependency 'commandline' is not used by any target
Found 1 product dependencies
  - Collections
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/davidskrundz/commandline.git
https://github.com/davidskrundz/commandline.git
{
  "dependencies" : [
    {
      "identity" : "collections",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "2.1.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/DavidSkrundz/Collections.git"
    }
  ],
  "manifest_display_name" : "CommandLine",
  "name" : "CommandLine",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "CommandLine",
      "targets" : [
        "CommandLine"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "sCommandLine",
      "targets" : [
        "CommandLine"
      ],
      "type" : {
        "library" : [
          "static"
        ]
      }
    },
    {
      "name" : "dCommandLine",
      "targets" : [
        "CommandLine"
      ],
      "type" : {
        "library" : [
          "dynamic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "CommandLineTests",
      "module_type" : "SwiftTarget",
      "name" : "CommandLineTests",
      "path" : "Tests/CommandLineTests",
      "sources" : [
        "ArgumentParserTests.swift",
        "AutoTaskTests.swift"
      ],
      "target_dependencies" : [
        "CommandLine"
      ],
      "type" : "test"
    },
    {
      "c99name" : "CommandLine",
      "module_type" : "SwiftTarget",
      "name" : "CommandLine",
      "path" : "Sources/CommandLine",
      "product_dependencies" : [
        "Generator"
      ],
      "product_memberships" : [
        "CommandLine",
        "sCommandLine",
        "dCommandLine"
      ],
      "sources" : [
        "ANSI.swift",
        "ArgumentParser.swift",
        "AutoTask.swift",
        "Option.swift",
        "Output.swift",
        "ParseError.swift",
        "StandardInOut.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...
[0/7] Write sources
[2/7] Write swift-version-2F0A5646E1D333AE.txt
[4/17] Compiling Generator Generator+String.swift
[5/17] Compiling Generator Generator+Sequence.swift
[6/17] Emitting module Generator
[7/17] Compiling Generator Character.swift
[8/17] Compiling Generator Generator+Iterator.swift
[9/17] Compiling Generator Generator+Peek.swift
[10/17] Compiling Generator Collection+Generator.swift
[11/17] Compiling Generator Generator+Previous.swift
[12/17] Compiling Generator Generator.swift
[13/17] Compiling Generator Generator+Move.swift
[14/25] Compiling CommandLine ParseError.swift
[15/25] Compiling CommandLine Output.swift
[16/25] Compiling CommandLine Option.swift
[17/25] Compiling CommandLine ArgumentParser.swift
[18/25] Emitting module CommandLine
/Users/admin/builder/spi-builder-workspace/Sources/CommandLine/StandardInOut.swift:29:12: warning: let 'standardIn' is not concurrency-safe because non-'Sendable' type 'StandardIn' may have shared mutable state; this is an error in the Swift 6 language mode
19 | }
20 |
21 | public struct StandardIn {
   |               `- note: consider making struct 'StandardIn' conform to the 'Sendable' protocol
22 | 	fileprivate init() {}
23 |
   :
27 | }
28 |
29 | public let standardIn: StandardIn = StandardIn()
   |            |- warning: let 'standardIn' is not concurrency-safe because non-'Sendable' type 'StandardIn' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: add '@MainActor' to make let 'standardIn' part of global actor 'MainActor'
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
30 | public let standardOut: StandardOut = StandardOut()
31 |
/Users/admin/builder/spi-builder-workspace/Sources/CommandLine/StandardInOut.swift:30:12: warning: let 'standardOut' is not concurrency-safe because non-'Sendable' type 'StandardOut' may have shared mutable state; this is an error in the Swift 6 language mode
 6 | import Foundation
 7 |
 8 | public struct StandardOut: Output {
   |               `- note: consider making struct 'StandardOut' conform to the 'Sendable' protocol
 9 | 	fileprivate init() {}
10 |
   :
28 |
29 | public let standardIn: StandardIn = StandardIn()
30 | public let standardOut: StandardOut = StandardOut()
   |            |- warning: let 'standardOut' is not concurrency-safe because non-'Sendable' type 'StandardOut' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: add '@MainActor' to make let 'standardOut' part of global actor 'MainActor'
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
31 |
[19/25] Compiling CommandLine AutoTask.swift
[20/25] Compiling CommandLine StandardInOut.swift
/Users/admin/builder/spi-builder-workspace/Sources/CommandLine/StandardInOut.swift:29:12: warning: let 'standardIn' is not concurrency-safe because non-'Sendable' type 'StandardIn' may have shared mutable state; this is an error in the Swift 6 language mode
19 | }
20 |
21 | public struct StandardIn {
   |               `- note: consider making struct 'StandardIn' conform to the 'Sendable' protocol
22 | 	fileprivate init() {}
23 |
   :
27 | }
28 |
29 | public let standardIn: StandardIn = StandardIn()
   |            |- warning: let 'standardIn' is not concurrency-safe because non-'Sendable' type 'StandardIn' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: add '@MainActor' to make let 'standardIn' part of global actor 'MainActor'
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
30 | public let standardOut: StandardOut = StandardOut()
31 |
/Users/admin/builder/spi-builder-workspace/Sources/CommandLine/StandardInOut.swift:30:12: warning: let 'standardOut' is not concurrency-safe because non-'Sendable' type 'StandardOut' may have shared mutable state; this is an error in the Swift 6 language mode
 6 | import Foundation
 7 |
 8 | public struct StandardOut: Output {
   |               `- note: consider making struct 'StandardOut' conform to the 'Sendable' protocol
 9 | 	fileprivate init() {}
10 |
   :
28 |
29 | public let standardIn: StandardIn = StandardIn()
30 | public let standardOut: StandardOut = StandardOut()
   |            |- warning: let 'standardOut' is not concurrency-safe because non-'Sendable' type 'StandardOut' may have shared mutable state; this is an error in the Swift 6 language mode
   |            |- note: add '@MainActor' to make let 'standardOut' part of global actor 'MainActor'
   |            `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
31 |
[21/25] Compiling CommandLine ANSI.swift
[21/25] Write Objects.LinkFileList
[23/25] Archiving libsCommandLine.a
[24/25] Linking libdCommandLine.dylib
Build complete! (6.02s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "collections",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "2.1.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/DavidSkrundz/Collections.git"
    }
  ],
  "manifest_display_name" : "CommandLine",
  "name" : "CommandLine",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "CommandLine",
      "targets" : [
        "CommandLine"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "sCommandLine",
      "targets" : [
        "CommandLine"
      ],
      "type" : {
        "library" : [
          "static"
        ]
      }
    },
    {
      "name" : "dCommandLine",
      "targets" : [
        "CommandLine"
      ],
      "type" : {
        "library" : [
          "dynamic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "CommandLineTests",
      "module_type" : "SwiftTarget",
      "name" : "CommandLineTests",
      "path" : "Tests/CommandLineTests",
      "sources" : [
        "ArgumentParserTests.swift",
        "AutoTaskTests.swift"
      ],
      "target_dependencies" : [
        "CommandLine"
      ],
      "type" : "test"
    },
    {
      "c99name" : "CommandLine",
      "module_type" : "SwiftTarget",
      "name" : "CommandLine",
      "path" : "Sources/CommandLine",
      "product_dependencies" : [
        "Generator"
      ],
      "product_memberships" : [
        "CommandLine",
        "sCommandLine",
        "dCommandLine"
      ],
      "sources" : [
        "ANSI.swift",
        "ArgumentParser.swift",
        "AutoTask.swift",
        "Option.swift",
        "Output.swift",
        "ParseError.swift",
        "StandardInOut.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.