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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 GraphViz, reference 0.4.2 (e4e079), with Swift 6.1 for Linux on 29 Apr 2025 13:06:55 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/tuist/GraphViz.git
Reference: 0.4.2
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/tuist/GraphViz
 * tag               0.4.2      -> FETCH_HEAD
HEAD is now at e4e0796 Specify 10.15 deployment target to satisfy `Identifiable` deployment constraints
Cloned https://github.com/tuist/GraphViz.git
Revision (git rev-parse @):
e4e0796a8fa74b000aba54b0256601abf75d0307
SUCCESS checkout https://github.com/tuist/GraphViz.git at 0.4.2
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/tuist/GraphViz.git
https://github.com/tuist/GraphViz.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "GraphViz",
  "name" : "GraphViz",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.15"
    }
  ],
  "products" : [
    {
      "name" : "GraphViz",
      "targets" : [
        "GraphViz",
        "DOT",
        "Tools"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "GraphVizBuilder",
      "targets" : [
        "GraphVizBuilder"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Tools",
      "module_type" : "SwiftTarget",
      "name" : "Tools",
      "path" : "Sources/Tools",
      "product_memberships" : [
        "GraphViz"
      ],
      "sources" : [
        "Extensions/Graph+Rendering.swift",
        "Renderer.swift",
        "which.swift"
      ],
      "target_dependencies" : [
        "GraphViz",
        "DOT"
      ],
      "type" : "library"
    },
    {
      "c99name" : "GraphVizTests",
      "module_type" : "SwiftTarget",
      "name" : "GraphVizTests",
      "path" : "Tests/GraphVizTests",
      "sources" : [
        "AttributesTest.swift",
        "EdgeTests.swift",
        "GraphTests.swift",
        "NodeTests.swift",
        "RenderingTests.swift",
        "SubgraphTests.swift"
      ],
      "target_dependencies" : [
        "GraphViz",
        "DOT",
        "Tools"
      ],
      "type" : "test"
    },
    {
      "c99name" : "GraphVizBuilderTests",
      "module_type" : "SwiftTarget",
      "name" : "GraphVizBuilderTests",
      "path" : "Tests/GraphVizBuilderTests",
      "sources" : [
        "GraphBuilderTests.swift",
        "SubgraphBuilderTests.swift"
      ],
      "target_dependencies" : [
        "GraphViz",
        "DOT",
        "GraphVizBuilder"
      ],
      "type" : "test"
    },
    {
      "c99name" : "GraphVizBuilder",
      "module_type" : "SwiftTarget",
      "name" : "GraphVizBuilder",
      "path" : "Sources/GraphVizBuilder",
      "product_memberships" : [
        "GraphVizBuilder"
      ],
      "sources" : [
        "Extensions/Edge+Extensions.swift",
        "Extensions/Graph+Extensions.swift",
        "Extensions/Node+Extensions.swift",
        "Extensions/Subgraph+Extensions.swift",
        "GraphBuilder.swift",
        "Operators/BackwardEdgeOperator.swift",
        "Operators/BidirectionalEdgeOperator.swift",
        "Operators/ForwardEdgeOperator.swift",
        "Operators/UndirectedEdgeOperator.swift",
        "SubgraphBuilder.swift"
      ],
      "target_dependencies" : [
        "GraphViz"
      ],
      "type" : "library"
    },
    {
      "c99name" : "GraphViz",
      "module_type" : "SwiftTarget",
      "name" : "GraphViz",
      "path" : "Sources/GraphViz",
      "product_memberships" : [
        "GraphViz",
        "GraphVizBuilder"
      ],
      "sources" : [
        "Attribute.swift",
        "Edge.swift",
        "Extensions/KeyValuePairs+Extensions.swift",
        "Graph.swift",
        "Node.swift",
        "Rendering/Format.swift",
        "Rendering/LayoutAlgorithm.swift",
        "Subgraph.swift",
        "Supporting Types/AspectRatio.swift",
        "Supporting Types/Color.swift",
        "Supporting Types/Location.swift",
        "Supporting Types/Ordering.swift",
        "Supporting Types/Point.swift",
        "Supporting Types/Position.swift",
        "Supporting Types/Rectangle.swift",
        "Supporting Types/Size.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "DOT",
      "module_type" : "SwiftTarget",
      "name" : "DOT",
      "path" : "Sources/DOT",
      "product_memberships" : [
        "GraphViz"
      ],
      "sources" : [
        "DOT.swift",
        "DOTEncoder.swift",
        "DOTRepresentable.swift"
      ],
      "target_dependencies" : [
        "GraphViz"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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
Building for debugging...
[0/5] Write sources
[4/5] Write swift-version-24593BA9C3E375BF.txt
[6/20] Compiling GraphViz Attribute.swift
[7/20] Compiling GraphViz Edge.swift
[8/20] Emitting module GraphViz
/host/spi-builder-workspace/Sources/GraphViz/Extensions/KeyValuePairs+Extensions.swift:1:1: warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Equatable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
 1 | extension KeyValuePairs: Equatable where Key: Equatable, Value: Equatable {
   | |- warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Equatable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
 2 |     public static func == (lhs: KeyValuePairs<Key, Value>, rhs: KeyValuePairs<Key, Value>) -> Bool {
 3 |         guard lhs.count == rhs.count else { return false }
/host/spi-builder-workspace/Sources/GraphViz/Extensions/KeyValuePairs+Extensions.swift:12:1: warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Hashable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
10 | }
11 |
12 | extension KeyValuePairs: Hashable where Key: Hashable, Value: Hashable {
   | |- warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Hashable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
13 |     public func hash(into hasher: inout Hasher) {
14 |         for (key, value) in self {
[9/20] Compiling GraphViz Location.swift
[10/20] Compiling GraphViz Ordering.swift
[11/20] Compiling GraphViz Point.swift
[12/20] Compiling GraphViz Position.swift
[13/22] Compiling GraphViz KeyValuePairs+Extensions.swift
/host/spi-builder-workspace/Sources/GraphViz/Extensions/KeyValuePairs+Extensions.swift:1:1: warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Equatable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
 1 | extension KeyValuePairs: Equatable where Key: Equatable, Value: Equatable {
   | |- warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Equatable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
 2 |     public static func == (lhs: KeyValuePairs<Key, Value>, rhs: KeyValuePairs<Key, Value>) -> Bool {
 3 |         guard lhs.count == rhs.count else { return false }
/host/spi-builder-workspace/Sources/GraphViz/Extensions/KeyValuePairs+Extensions.swift:12:1: warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Hashable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
10 | }
11 |
12 | extension KeyValuePairs: Hashable where Key: Hashable, Value: Hashable {
   | |- warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Hashable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
13 |     public func hash(into hasher: inout Hasher) {
14 |         for (key, value) in self {
[14/22] Compiling GraphViz Graph.swift
/host/spi-builder-workspace/Sources/GraphViz/Extensions/KeyValuePairs+Extensions.swift:1:1: warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Equatable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
 1 | extension KeyValuePairs: Equatable where Key: Equatable, Value: Equatable {
   | |- warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Equatable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
 2 |     public static func == (lhs: KeyValuePairs<Key, Value>, rhs: KeyValuePairs<Key, Value>) -> Bool {
 3 |         guard lhs.count == rhs.count else { return false }
/host/spi-builder-workspace/Sources/GraphViz/Extensions/KeyValuePairs+Extensions.swift:12:1: warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Hashable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
10 | }
11 |
12 | extension KeyValuePairs: Hashable where Key: Hashable, Value: Hashable {
   | |- warning: extension declares a conformance of imported type 'KeyValuePairs' to imported protocol 'Hashable'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
   | `- note: add '@retroactive' to silence this warning
13 |     public func hash(into hasher: inout Hasher) {
14 |         for (key, value) in self {
[15/22] Compiling GraphViz Node.swift
[16/22] Compiling GraphViz Format.swift
[17/22] Compiling GraphViz LayoutAlgorithm.swift
[18/22] Compiling GraphViz Subgraph.swift
[19/22] Compiling GraphViz AspectRatio.swift
[20/22] Compiling GraphViz Color.swift
[21/22] Compiling GraphViz Rectangle.swift
[22/22] Compiling GraphViz Size.swift
[24/37] Compiling GraphVizBuilder UndirectedEdgeOperator.swift
[25/38] Compiling GraphVizBuilder GraphBuilder.swift
/host/spi-builder-workspace/Sources/GraphVizBuilder/GraphBuilder.swift:11:2: warning: '@_functionBuilder' has been renamed to '@resultBuilder'
 9 | // MARK: -
10 |
11 | @_functionBuilder
   |  `- warning: '@_functionBuilder' has been renamed to '@resultBuilder'
12 | public struct GraphBuilder {
13 |     struct Fragment: GraphMember {
[26/38] Compiling GraphVizBuilder BackwardEdgeOperator.swift
[27/38] Compiling GraphVizBuilder Node+Extensions.swift
[28/38] Compiling GraphVizBuilder Subgraph+Extensions.swift
[29/38] Compiling GraphVizBuilder BidirectionalEdgeOperator.swift
[30/38] Compiling GraphVizBuilder ForwardEdgeOperator.swift
[31/38] Compiling GraphVizBuilder SubgraphBuilder.swift
/host/spi-builder-workspace/Sources/GraphVizBuilder/SubgraphBuilder.swift:10:2: warning: '@_functionBuilder' has been renamed to '@resultBuilder'
 8 | // MARK: -
 9 |
10 | @_functionBuilder
   |  `- warning: '@_functionBuilder' has been renamed to '@resultBuilder'
11 | public struct SubgraphBuilder {
12 |     struct Fragment: SubgraphMember {
[32/38] Emitting module GraphVizBuilder
/host/spi-builder-workspace/Sources/GraphVizBuilder/GraphBuilder.swift:11:2: warning: '@_functionBuilder' has been renamed to '@resultBuilder'
 9 | // MARK: -
10 |
11 | @_functionBuilder
   |  `- warning: '@_functionBuilder' has been renamed to '@resultBuilder'
12 | public struct GraphBuilder {
13 |     struct Fragment: GraphMember {
/host/spi-builder-workspace/Sources/GraphVizBuilder/SubgraphBuilder.swift:10:2: warning: '@_functionBuilder' has been renamed to '@resultBuilder'
 8 | // MARK: -
 9 |
10 | @_functionBuilder
   |  `- warning: '@_functionBuilder' has been renamed to '@resultBuilder'
11 | public struct SubgraphBuilder {
12 |     struct Fragment: SubgraphMember {
[33/38] Compiling GraphVizBuilder Edge+Extensions.swift
[34/38] Compiling GraphVizBuilder Graph+Extensions.swift
[36/39] Compiling DOT DOTRepresentable.swift
[37/39] Compiling DOT DOT.swift
[38/39] Compiling DOT DOTEncoder.swift
/host/spi-builder-workspace/Sources/DOT/DOTEncoder.swift:25:24: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'DOTEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
  5 | /// For more information about the DOT language,
  6 | /// see <https://www.graphviz.org/doc/info/lang.html>.
  7 | public struct DOTEncoder {
    |               `- note: consider making struct 'DOTEncoder' conform to the 'Sendable' protocol
  8 |     public enum Delimiter: String {
  9 |         case comma = ","
    :
 23 |     public var omitEmptyNodes: Bool = true
 24 |
 25 |     private static let shared = DOTEncoder()
    |                        |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'DOTEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 26 |
 27 |     /// Creates a new DOT encoder.
[39/39] Emitting module DOT
/host/spi-builder-workspace/Sources/DOT/DOTEncoder.swift:25:24: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'DOTEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
  5 | /// For more information about the DOT language,
  6 | /// see <https://www.graphviz.org/doc/info/lang.html>.
  7 | public struct DOTEncoder {
    |               `- note: consider making struct 'DOTEncoder' conform to the 'Sendable' protocol
  8 |     public enum Delimiter: String {
  9 |         case comma = ","
    :
 23 |     public var omitEmptyNodes: Bool = true
 24 |
 25 |     private static let shared = DOTEncoder()
    |                        |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'DOTEncoder' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 26 |
 27 |     /// Creates a new DOT encoder.
[41/44] Compiling Tools which.swift
[42/44] Compiling Tools Graph+Rendering.swift
[43/44] Emitting module Tools
[44/44] Compiling Tools Renderer.swift
/host/spi-builder-workspace/Sources/Tools/Renderer.swift:83:13: warning: mutation of captured var 'data' in concurrently-executing code; this is an error in the Swift 6 language mode
 81 |         defer { outputPipe.fileHandleForReading.closeFile() }
 82 |         outputPipe.fileHandleForReading.readabilityHandler = { fileHandle in
 83 |             data.append(fileHandle.availableData)
    |             `- warning: mutation of captured var 'data' in concurrently-executing code; this is an error in the Swift 6 language mode
 84 |         }
 85 |         task.standardOutput = outputPipe
Build complete! (10.18s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "GraphViz",
  "name" : "GraphViz",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.15"
    }
  ],
  "products" : [
    {
      "name" : "GraphViz",
      "targets" : [
        "GraphViz",
        "DOT",
        "Tools"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "GraphVizBuilder",
      "targets" : [
        "GraphVizBuilder"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Tools",
      "module_type" : "SwiftTarget",
      "name" : "Tools",
      "path" : "Sources/Tools",
      "product_memberships" : [
        "GraphViz"
      ],
      "sources" : [
        "Extensions/Graph+Rendering.swift",
        "Renderer.swift",
        "which.swift"
      ],
      "target_dependencies" : [
        "GraphViz",
        "DOT"
      ],
      "type" : "library"
    },
    {
      "c99name" : "GraphVizTests",
      "module_type" : "SwiftTarget",
      "name" : "GraphVizTests",
      "path" : "Tests/GraphVizTests",
      "sources" : [
        "AttributesTest.swift",
        "EdgeTests.swift",
        "GraphTests.swift",
        "NodeTests.swift",
        "RenderingTests.swift",
        "SubgraphTests.swift"
      ],
      "target_dependencies" : [
        "GraphViz",
        "DOT",
        "Tools"
      ],
      "type" : "test"
    },
    {
      "c99name" : "GraphVizBuilderTests",
      "module_type" : "SwiftTarget",
      "name" : "GraphVizBuilderTests",
      "path" : "Tests/GraphVizBuilderTests",
      "sources" : [
        "GraphBuilderTests.swift",
        "SubgraphBuilderTests.swift"
      ],
      "target_dependencies" : [
        "GraphViz",
        "DOT",
        "GraphVizBuilder"
      ],
      "type" : "test"
    },
    {
      "c99name" : "GraphVizBuilder",
      "module_type" : "SwiftTarget",
      "name" : "GraphVizBuilder",
      "path" : "Sources/GraphVizBuilder",
      "product_memberships" : [
        "GraphVizBuilder"
      ],
      "sources" : [
        "Extensions/Edge+Extensions.swift",
        "Extensions/Graph+Extensions.swift",
        "Extensions/Node+Extensions.swift",
        "Extensions/Subgraph+Extensions.swift",
        "GraphBuilder.swift",
        "Operators/BackwardEdgeOperator.swift",
        "Operators/BidirectionalEdgeOperator.swift",
        "Operators/ForwardEdgeOperator.swift",
        "Operators/UndirectedEdgeOperator.swift",
        "SubgraphBuilder.swift"
      ],
      "target_dependencies" : [
        "GraphViz"
      ],
      "type" : "library"
    },
    {
      "c99name" : "GraphViz",
      "module_type" : "SwiftTarget",
      "name" : "GraphViz",
      "path" : "Sources/GraphViz",
      "product_memberships" : [
        "GraphViz",
        "GraphVizBuilder"
      ],
      "sources" : [
        "Attribute.swift",
        "Edge.swift",
        "Extensions/KeyValuePairs+Extensions.swift",
        "Graph.swift",
        "Node.swift",
        "Rendering/Format.swift",
        "Rendering/LayoutAlgorithm.swift",
        "Subgraph.swift",
        "Supporting Types/AspectRatio.swift",
        "Supporting Types/Color.swift",
        "Supporting Types/Location.swift",
        "Supporting Types/Ordering.swift",
        "Supporting Types/Point.swift",
        "Supporting Types/Position.swift",
        "Supporting Types/Rectangle.swift",
        "Supporting Types/Size.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "DOT",
      "module_type" : "SwiftTarget",
      "name" : "DOT",
      "path" : "Sources/DOT",
      "product_memberships" : [
        "GraphViz"
      ],
      "sources" : [
        "DOT.swift",
        "DOTEncoder.swift",
        "DOTRepresentable.swift"
      ],
      "target_dependencies" : [
        "GraphViz"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
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
Done.