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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 ObjectCoder, reference main (7b9cf6), with Swift 6.1 for Linux on 26 Apr 2025 19:22:36 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: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/nearfri/ObjectCoder.git
Reference: main
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/nearfri/ObjectCoder
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 7b9cf69 Update swift.yml
Cloned https://github.com/nearfri/ObjectCoder.git
Revision (git rev-parse @):
7b9cf696e939396a993d57455a774341b252d5d0
SUCCESS checkout https://github.com/nearfri/ObjectCoder.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/nearfri/ObjectCoder.git
https://github.com/nearfri/ObjectCoder.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "cwlpreconditiontesting",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/mattgallagher/CwlPreconditionTesting"
    }
  ],
  "manifest_display_name" : "ObjectCoder",
  "name" : "ObjectCoder",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "ObjectCoder",
      "targets" : [
        "ObjectCoder"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ObjectCoderTests",
      "module_type" : "SwiftTarget",
      "name" : "ObjectCoderTests",
      "path" : "Tests/ObjectCoderTests",
      "product_dependencies" : [
        "CwlPreconditionTesting"
      ],
      "sources" : [
        "ObjectCoderTests.swift"
      ],
      "target_dependencies" : [
        "ObjectCoder"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ObjectCoder",
      "module_type" : "SwiftTarget",
      "name" : "ObjectCoder",
      "path" : "Sources/ObjectCoder",
      "product_memberships" : [
        "ObjectCoder"
      ],
      "sources" : [
        "CodingStorage.swift",
        "Decoder/InitializableWithAny.swift",
        "Decoder/KeyedObjectDecodingContainer.swift",
        "Decoder/ObjectDecoder.swift",
        "Decoder/SingleValueObjectDecodingContainer.swift",
        "Decoder/UnkeyedObjectDecodingContainer.swift",
        "Encoder/KeyedObjectEncodingContainer.swift",
        "Encoder/ObjectContainer.swift",
        "Encoder/ObjectEncoder.swift",
        "Encoder/ReferencingEncoder.swift",
        "Encoder/SingleValueObjectEncodingContanier.swift",
        "Encoder/UnkeyedObjectEncodingContanier.swift",
        "Errors.swift",
        "NilCodingStrategy.swift",
        "ObjectCoder+Combine.swift",
        "ObjectKey.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
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
Fetching https://github.com/mattgallagher/CwlPreconditionTesting
[1/1257] Fetching cwlpreconditiontesting
Fetched https://github.com/mattgallagher/CwlPreconditionTesting from cache (0.22s)
Computing version for https://github.com/mattgallagher/CwlPreconditionTesting
Computed https://github.com/mattgallagher/CwlPreconditionTesting at 2.2.2 (0.81s)
Fetching https://github.com/mattgallagher/CwlCatchException.git
[1/455] Fetching cwlcatchexception
Fetched https://github.com/mattgallagher/CwlCatchException.git from cache (0.21s)
Computing version for https://github.com/mattgallagher/CwlCatchException.git
Computed https://github.com/mattgallagher/CwlCatchException.git at 2.2.1 (0.83s)
Creating working copy for https://github.com/mattgallagher/CwlCatchException.git
Working copy of https://github.com/mattgallagher/CwlCatchException.git resolved at 2.2.1
Creating working copy for https://github.com/mattgallagher/CwlPreconditionTesting
Working copy of https://github.com/mattgallagher/CwlPreconditionTesting resolved at 2.2.2
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/17] Compiling ObjectCoder KeyedObjectDecodingContainer.swift
[4/17] Compiling ObjectCoder ObjectDecoder.swift
[5/19] Compiling ObjectCoder KeyedObjectEncodingContainer.swift
[6/19] Compiling ObjectCoder ObjectContainer.swift
[7/19] Compiling ObjectCoder SingleValueObjectDecodingContainer.swift
[8/19] Compiling ObjectCoder UnkeyedObjectDecodingContainer.swift
[9/19] Compiling ObjectCoder SingleValueObjectEncodingContanier.swift
[10/19] Compiling ObjectCoder UnkeyedObjectEncodingContanier.swift
[11/19] Compiling ObjectCoder ObjectEncoder.swift
[12/19] Compiling ObjectCoder ReferencingEncoder.swift
[13/19] Compiling ObjectCoder Errors.swift
/host/spi-builder-workspace/Sources/ObjectCoder/NilCodingStrategy.swift:32:23: warning: static property 'default' is not concurrency-safe because non-'Sendable' type 'NilCodingStrategy' may have shared mutable state; this is an error in the Swift 6 language mode
 1 | import Foundation
 2 |
 3 | public enum NilCodingStrategy {
   |             `- note: consider making enum 'NilCodingStrategy' conform to the 'Sendable' protocol
 4 |     case null           // NSNull
 5 |     case symbol(String) // symbol like "$null"
   :
30 |
31 | extension NilCodingStrategy {
32 |     public static let `default`: NilCodingStrategy = .symbol(NilCodingStrategy.defaultNilSymbol)
   |                       |- warning: static property 'default' is not concurrency-safe because non-'Sendable' type 'NilCodingStrategy' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'default' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
33 |     public static let defaultNilSymbol: String = "$null"
34 | }
[14/19] Compiling ObjectCoder NilCodingStrategy.swift
/host/spi-builder-workspace/Sources/ObjectCoder/NilCodingStrategy.swift:32:23: warning: static property 'default' is not concurrency-safe because non-'Sendable' type 'NilCodingStrategy' may have shared mutable state; this is an error in the Swift 6 language mode
 1 | import Foundation
 2 |
 3 | public enum NilCodingStrategy {
   |             `- note: consider making enum 'NilCodingStrategy' conform to the 'Sendable' protocol
 4 |     case null           // NSNull
 5 |     case symbol(String) // symbol like "$null"
   :
30 |
31 | extension NilCodingStrategy {
32 |     public static let `default`: NilCodingStrategy = .symbol(NilCodingStrategy.defaultNilSymbol)
   |                       |- warning: static property 'default' is not concurrency-safe because non-'Sendable' type 'NilCodingStrategy' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'default' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
33 |     public static let defaultNilSymbol: String = "$null"
34 | }
[15/19] Compiling ObjectCoder ObjectCoder+Combine.swift
[16/19] Compiling ObjectCoder ObjectKey.swift
[17/19] Emitting module ObjectCoder
/host/spi-builder-workspace/Sources/ObjectCoder/NilCodingStrategy.swift:32:23: warning: static property 'default' is not concurrency-safe because non-'Sendable' type 'NilCodingStrategy' may have shared mutable state; this is an error in the Swift 6 language mode
 1 | import Foundation
 2 |
 3 | public enum NilCodingStrategy {
   |             `- note: consider making enum 'NilCodingStrategy' conform to the 'Sendable' protocol
 4 |     case null           // NSNull
 5 |     case symbol(String) // symbol like "$null"
   :
30 |
31 | extension NilCodingStrategy {
32 |     public static let `default`: NilCodingStrategy = .symbol(NilCodingStrategy.defaultNilSymbol)
   |                       |- warning: static property 'default' is not concurrency-safe because non-'Sendable' type 'NilCodingStrategy' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'default' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
33 |     public static let defaultNilSymbol: String = "$null"
34 | }
[18/19] Compiling ObjectCoder CodingStorage.swift
[19/19] Compiling ObjectCoder InitializableWithAny.swift
Build complete! (12.64s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "cwlpreconditiontesting",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/mattgallagher/CwlPreconditionTesting"
    }
  ],
  "manifest_display_name" : "ObjectCoder",
  "name" : "ObjectCoder",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "ObjectCoder",
      "targets" : [
        "ObjectCoder"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ObjectCoderTests",
      "module_type" : "SwiftTarget",
      "name" : "ObjectCoderTests",
      "path" : "Tests/ObjectCoderTests",
      "product_dependencies" : [
        "CwlPreconditionTesting"
      ],
      "sources" : [
        "ObjectCoderTests.swift"
      ],
      "target_dependencies" : [
        "ObjectCoder"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ObjectCoder",
      "module_type" : "SwiftTarget",
      "name" : "ObjectCoder",
      "path" : "Sources/ObjectCoder",
      "product_memberships" : [
        "ObjectCoder"
      ],
      "sources" : [
        "CodingStorage.swift",
        "Decoder/InitializableWithAny.swift",
        "Decoder/KeyedObjectDecodingContainer.swift",
        "Decoder/ObjectDecoder.swift",
        "Decoder/SingleValueObjectDecodingContainer.swift",
        "Decoder/UnkeyedObjectDecodingContainer.swift",
        "Encoder/KeyedObjectEncodingContainer.swift",
        "Encoder/ObjectContainer.swift",
        "Encoder/ObjectEncoder.swift",
        "Encoder/ReferencingEncoder.swift",
        "Encoder/SingleValueObjectEncodingContanier.swift",
        "Encoder/UnkeyedObjectEncodingContanier.swift",
        "Errors.swift",
        "NilCodingStrategy.swift",
        "ObjectCoder+Combine.swift",
        "ObjectKey.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
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.