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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 DataSource, reference 8.1.6 (921f9b), with Swift 6.1 for watchOS using Xcode 16.3 on 28 Apr 2025 18:49:55 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme DataSource -destination generic/platform=watchOS

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/allaboutapps/DataSource.git
Reference: 8.1.6
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/allaboutapps/DataSource
 * tag               8.1.6      -> FETCH_HEAD
HEAD is now at 921f9b9 Fixed crash when scrolling tableView with VoiceOver enabled (#42)
Cloned https://github.com/allaboutapps/DataSource.git
Revision (git rev-parse @):
921f9b92afb587b5a99361f631d41838ad261501
SUCCESS checkout https://github.com/allaboutapps/DataSource.git at 8.1.6
========================================
Build
========================================
Selected platform:         watchOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/allaboutapps/DataSource.git
https://github.com/allaboutapps/DataSource.git
{
  "dependencies" : [
    {
      "identity" : "differ",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.4.3",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/tonyarnold/Differ.git"
    }
  ],
  "manifest_display_name" : "DataSource",
  "name" : "DataSource",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.12"
    },
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "watchos",
      "version" : "3.0"
    }
  ],
  "products" : [
    {
      "name" : "DataSource",
      "targets" : [
        "DataSource"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "DataSourceTests",
      "module_type" : "SwiftTarget",
      "name" : "DataSourceTests",
      "path" : "DataSourceTests",
      "sources" : [
        "ConcurrentReloadSelectTest.swift"
      ],
      "target_dependencies" : [
        "DataSource"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DataSource",
      "module_type" : "SwiftTarget",
      "name" : "DataSource",
      "path" : "DataSource",
      "product_dependencies" : [
        "Differ"
      ],
      "product_memberships" : [
        "DataSource"
      ],
      "sources" : [
        "AutoRegisterCell.swift",
        "CellDescriptor.swift",
        "DataSource+Diff.swift",
        "DataSource+UITableViewDataSource.swift",
        "DataSource+UITableViewDataSourcePrefetching.swift",
        "DataSource+UITableViewDelegate.swift",
        "DataSource.swift",
        "Diffable.swift",
        "Row.swift",
        "Section.swift",
        "SectionDescriptor.swift",
        "SeparatedSection/SeparatedSection.swift",
        "SeparatedSection/SeparatorCustomViewViewModel.swift",
        "SeparatedSection/SeparatorLineCell.swift",
        "SeparatedSection/SeparatorLineViewModel.swift",
        "UITableViewExtensions.swift",
        "Utilities/UIView+AutoLayout.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Fetching from https://github.com/tonyarnold/Differ
Creating working copy of package ‘Differ’
Checking out 1.4.5 of package ‘Differ’
Resolved source packages:
  Differ: https://github.com/tonyarnold/Differ @ 1.4.5
resolved source packages: Differ
{
  "dependencies" : [
    {
      "identity" : "differ",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.4.3",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/tonyarnold/Differ.git"
    }
  ],
  "manifest_display_name" : "DataSource",
  "name" : "DataSource",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.12"
    },
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "watchos",
      "version" : "3.0"
    }
  ],
  "products" : [
    {
      "name" : "DataSource",
      "targets" : [
        "DataSource"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "DataSourceTests",
      "module_type" : "SwiftTarget",
      "name" : "DataSourceTests",
      "path" : "DataSourceTests",
      "sources" : [
        "ConcurrentReloadSelectTest.swift"
      ],
      "target_dependencies" : [
        "DataSource"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DataSource",
      "module_type" : "SwiftTarget",
      "name" : "DataSource",
      "path" : "DataSource",
      "product_dependencies" : [
        "Differ"
      ],
      "product_memberships" : [
        "DataSource"
      ],
      "sources" : [
        "AutoRegisterCell.swift",
        "CellDescriptor.swift",
        "DataSource+Diff.swift",
        "DataSource+UITableViewDataSource.swift",
        "DataSource+UITableViewDataSourcePrefetching.swift",
        "DataSource+UITableViewDelegate.swift",
        "DataSource.swift",
        "Diffable.swift",
        "Row.swift",
        "Section.swift",
        "SectionDescriptor.swift",
        "SeparatedSection/SeparatedSection.swift",
        "SeparatedSection/SeparatorCustomViewViewModel.swift",
        "SeparatedSection/SeparatorLineCell.swift",
        "SeparatedSection/SeparatorLineViewModel.swift",
        "UITableViewExtensions.swift",
        "Utilities/UIView+AutoLayout.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "DataSource",
    "schemes" : [
      "DataSource",
      "DataSourceTests",
      "Example"
    ],
    "targets" : [
      "Example",
      "DataSource",
      "DataSourceTests"
    ]
  }
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "DataSource"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme DataSource -destination generic/platform=watchOS OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme DataSource -destination generic/platform=watchOS "OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures"
Build settings from command line:
    OTHER_SWIFT_FLAGS = -stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
Resolve Package Graph
Resolved source packages:
  Differ: https://github.com/tonyarnold/Differ @ 1.4.5
  DataSource: /Users/admin/builder/spi-builder-workspace
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (4 targets)
    Target 'DataSource' in project 'DataSource'
        ➜ Explicit dependency on target 'DataSource' in project 'DataSource'
        ➜ Explicit dependency on target 'Differ' in project 'Differ'
    Target 'DataSource' in project 'DataSource'
        ➜ Explicit dependency on target 'Differ' in project 'Differ'
    Target 'Differ' in project 'Differ'
        ➜ Explicit dependency on target 'Differ' in project 'Differ'
    Target 'Differ' in project 'Differ' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS11.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
Build description signature: 5b5fc982e9020b4b47abf720998d4332
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/5b5fc982e9020b4b47abf720998d4332.xcbuilddata
error: The package product 'Differ' requires minimum platform version 5.0 for the watchOS platform, but this target supports 4.0 (in target 'DataSource' from project 'DataSource')
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme DataSource
(1 failure)
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Resolved source packages:
  DataSource: /Users/admin/builder/spi-builder-workspace
  Differ: https://github.com/tonyarnold/Differ @ 1.4.5
resolved source packages: DataSource, Differ
{
  "dependencies" : [
    {
      "identity" : "differ",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.4.3",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/tonyarnold/Differ.git"
    }
  ],
  "manifest_display_name" : "DataSource",
  "name" : "DataSource",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.12"
    },
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "watchos",
      "version" : "3.0"
    }
  ],
  "products" : [
    {
      "name" : "DataSource",
      "targets" : [
        "DataSource"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "DataSourceTests",
      "module_type" : "SwiftTarget",
      "name" : "DataSourceTests",
      "path" : "DataSourceTests",
      "sources" : [
        "ConcurrentReloadSelectTest.swift"
      ],
      "target_dependencies" : [
        "DataSource"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DataSource",
      "module_type" : "SwiftTarget",
      "name" : "DataSource",
      "path" : "DataSource",
      "product_dependencies" : [
        "Differ"
      ],
      "product_memberships" : [
        "DataSource"
      ],
      "sources" : [
        "AutoRegisterCell.swift",
        "CellDescriptor.swift",
        "DataSource+Diff.swift",
        "DataSource+UITableViewDataSource.swift",
        "DataSource+UITableViewDataSourcePrefetching.swift",
        "DataSource+UITableViewDelegate.swift",
        "DataSource.swift",
        "Diffable.swift",
        "Row.swift",
        "Section.swift",
        "SectionDescriptor.swift",
        "SeparatedSection/SeparatedSection.swift",
        "SeparatedSection/SeparatorCustomViewViewModel.swift",
        "SeparatedSection/SeparatorLineCell.swift",
        "SeparatedSection/SeparatorLineViewModel.swift",
        "UITableViewExtensions.swift",
        "Utilities/UIView+AutoLayout.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "DataSource"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme DataSource -destination generic/platform=watchOS
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme DataSource -destination generic/platform=watchOS
Resolve Package Graph
Resolved source packages:
  Differ: https://github.com/tonyarnold/Differ @ 1.4.5
  DataSource: /Users/admin/builder/spi-builder-workspace
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (4 targets)
    Target 'DataSource' in project 'DataSource'
        ➜ Explicit dependency on target 'DataSource' in project 'DataSource'
        ➜ Explicit dependency on target 'Differ' in project 'Differ'
    Target 'DataSource' in project 'DataSource'
        ➜ Explicit dependency on target 'Differ' in project 'Differ'
    Target 'Differ' in project 'Differ'
        ➜ Explicit dependency on target 'Differ' in project 'Differ'
    Target 'Differ' in project 'Differ' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS11.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
Build description signature: 88ae24161f2451a1ed2855f64f4fc6eb
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/88ae24161f2451a1ed2855f64f4fc6eb.xcbuilddata
error: The package product 'Differ' requires minimum platform version 5.0 for the watchOS platform, but this target supports 4.0 (in target 'DataSource' from project 'DataSource')
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme DataSource
(1 failure)
BUILD FAILURE 6.1 watchOS