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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 skip-lib, reference 1.3.5 (443b05), with Swift 6.1 for Linux on 5 May 2025 05:01:48 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.3
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/skiptools/skip-lib.git
Reference: 1.3.5
Initialized empty Git repository in /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: 	git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: 	git branch -m <name>
From https://github.com/skiptools/skip-lib
 * tag               1.3.5      -> FETCH_HEAD
HEAD is now at 443b05b
Cloned https://github.com/skiptools/skip-lib.git
Revision (git rev-parse @):
443b05bfa861d58824ce6c24bed181caf7484c21
SUCCESS checkout https://github.com/skiptools/skip-lib.git at 1.3.5
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/skiptools/skip-lib.git
https://github.com/skiptools/skip-lib.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "skip",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.2.5",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://source.skip.tools/skip.git"
    },
    {
      "identity" : "skip-unit",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.1.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://source.skip.tools/skip-unit.git"
    }
  ],
  "manifest_display_name" : "skip-lib",
  "name" : "skip-lib",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "16.0"
    },
    {
      "name" : "macos",
      "version" : "13.0"
    },
    {
      "name" : "tvos",
      "version" : "16.0"
    },
    {
      "name" : "watchos",
      "version" : "9.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "16.0"
    }
  ],
  "products" : [
    {
      "name" : "SkipLib",
      "targets" : [
        "SkipLib"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SkipLibTests",
      "module_type" : "SwiftTarget",
      "name" : "SkipLibTests",
      "path" : "Tests/SkipLibTests",
      "product_dependencies" : [
        "SkipTest",
        "skipstone"
      ],
      "sources" : [
        "ArrayTests.swift",
        "CodableTests.swift",
        "CollectionsTests.swift",
        "ConcurrencyTests.swift",
        "DictionaryTests.swift",
        "GenericTests.swift",
        "GlobalsTests.swift",
        "KotlinConvertingTests.swift",
        "MathTests.swift",
        "NumberTests.swift",
        "OptionSetTests.swift",
        "OptionalTests.swift",
        "RandomTests.swift",
        "RegexTests.swift",
        "ResultTests.swift",
        "SetTests.swift",
        "SkipLibTests.swift",
        "StringInterpolationTests.swift",
        "StringTests.swift",
        "StructTests.swift",
        "XCSkipTests.swift"
      ],
      "target_dependencies" : [
        "SkipLib"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SkipLib",
      "module_type" : "SwiftTarget",
      "name" : "SkipLib",
      "path" : "Sources/SkipLib",
      "product_dependencies" : [
        "SkipUnit",
        "skipstone"
      ],
      "product_memberships" : [
        "SkipLib"
      ],
      "sources" : [
        "Array.swift",
        "AsyncStream.swift",
        "Bool.swift",
        "BridgeSupport.swift",
        "CaseIterable.swift",
        "Codable.swift",
        "CodableSupport.swift",
        "Collections.swift",
        "Concurrency.swift",
        "Copyable.swift",
        "CoreGraphics.swift",
        "CustomStringConvertible.swift",
        "Dictionary.swift",
        "Equatable.swift",
        "Error.swift",
        "Globals.swift",
        "Hashable.swift",
        "Identifiable.swift",
        "IntSet.swift",
        "Math.swift",
        "Numbers.swift",
        "ObjectIdentifier.swift",
        "OptionSet.swift",
        "Optional.swift",
        "Pointer.swift",
        "Random.swift",
        "RawRepresentable.swift",
        "Regex.swift",
        "Result.swift",
        "Set.swift",
        "SetAlgebra.swift",
        "SkipLib.swift",
        "String.swift",
        "StringInterpolationProtocol.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Fetching https://source.skip.tools/skip.git
Fetching https://source.skip.tools/skip-unit.git
[1/853] Fetching skip-unit
[854/8691] Fetching skip-unit, skip
Fetched https://source.skip.tools/skip-unit.git from cache (0.83s)
Fetched https://source.skip.tools/skip.git from cache (0.84s)
Computing version for https://source.skip.tools/skip-unit.git
Computed https://source.skip.tools/skip-unit.git at 1.1.2 (1.27s)
Computing version for https://source.skip.tools/skip.git
Computed https://source.skip.tools/skip.git at 1.5.6 (1.91s)
Creating working copy for https://source.skip.tools/skip.git
Working copy of https://source.skip.tools/skip.git resolved at 1.5.6
Creating working copy for https://source.skip.tools/skip-unit.git
Working copy of https://source.skip.tools/skip-unit.git resolved at 1.1.2
Downloading binary artifact https://source.skip.tools/skip/releases/download/1.5.6/skip.zip
[2747/15896468] Downloading https://source.skip.tools/skip/releases/download/1.5.6/skip.zip
Downloaded https://source.skip.tools/skip/releases/download/1.5.6/skip.zip (1.92s)
error: Tool ‘skip’ is not supported on the target platform
error: build planning stopped due to build-tool plugin failures
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
error: Tool ‘skip’ is not supported on the target platform
error: build planning stopped due to build-tool plugin failures
BUILD FAILURE 6.1 linux