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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 Environment, reference master (6fd93e), with Swift 6.1 for Linux on 25 Apr 2025 09:17:55 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/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/wlisac/environment.git
Reference: master
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/wlisac/environment
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 6fd93ec Update tests to use official Swift 5.1 image on Linux and use iPhone 11 simulator on iOS 13
Cloned https://github.com/wlisac/environment.git
Revision (git rev-parse @):
6fd93ec4282350b87d2c3ebc6c6f38a9dd7d2296
SUCCESS checkout https://github.com/wlisac/environment.git at master
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/wlisac/environment.git
https://github.com/wlisac/environment.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Environment",
  "name" : "Environment",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Environment",
      "targets" : [
        "Environment"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "EnvironmentTests",
      "module_type" : "SwiftTarget",
      "name" : "EnvironmentTests",
      "path" : "Tests/EnvironmentTests",
      "sources" : [
        "EnvironmentTests.swift",
        "EnvironmentVariableTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Environment"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Environment",
      "module_type" : "SwiftTarget",
      "name" : "Environment",
      "path" : "Sources/Environment",
      "product_memberships" : [
        "Environment"
      ],
      "sources" : [
        "Environment+Foundation.swift",
        "Environment+StandardLibrary.swift",
        "Environment.swift",
        "EnvironmentVariable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/host -w "$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...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/7] Compiling Environment Environment+StandardLibrary.swift
[4/7] Compiling Environment EnvironmentVariable.swift
[5/7] Compiling Environment Environment+Foundation.swift
[6/7] Emitting module Environment
/host/spi-builder-workspace/Sources/Environment/Environment.swift:16:23: warning: static property 'environment' is not concurrency-safe because non-'Sendable' type 'Environment' may have shared mutable state; this is an error in the Swift 6 language mode
 12 | /// A type-safe interface to variables in the environment from which the process was launched.
 13 | @dynamicMemberLookup
 14 | public struct Environment {
    |               `- note: consider making struct 'Environment' conform to the 'Sendable' protocol
 15 |     /// Returns the default environment for the current process.
 16 |     public static let environment = Environment()
    |                       |- warning: static property 'environment' is not concurrency-safe because non-'Sendable' type 'Environment' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'environment' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 17 |
 18 |     /// Accesses the environment variable associated with the given key for reading and writing.
[7/7] Compiling Environment Environment.swift
/host/spi-builder-workspace/Sources/Environment/Environment.swift:16:23: warning: static property 'environment' is not concurrency-safe because non-'Sendable' type 'Environment' may have shared mutable state; this is an error in the Swift 6 language mode
 12 | /// A type-safe interface to variables in the environment from which the process was launched.
 13 | @dynamicMemberLookup
 14 | public struct Environment {
    |               `- note: consider making struct 'Environment' conform to the 'Sendable' protocol
 15 |     /// Returns the default environment for the current process.
 16 |     public static let environment = Environment()
    |                       |- warning: static property 'environment' is not concurrency-safe because non-'Sendable' type 'Environment' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'environment' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 17 |
 18 |     /// Accesses the environment variable associated with the given key for reading and writing.
Build complete! (8.10s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Environment",
  "name" : "Environment",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Environment",
      "targets" : [
        "Environment"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "EnvironmentTests",
      "module_type" : "SwiftTarget",
      "name" : "EnvironmentTests",
      "path" : "Tests/EnvironmentTests",
      "sources" : [
        "EnvironmentTests.swift",
        "EnvironmentVariableTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Environment"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Environment",
      "module_type" : "SwiftTarget",
      "name" : "Environment",
      "path" : "Sources/Environment",
      "product_memberships" : [
        "Environment"
      ],
      "sources" : [
        "Environment+Foundation.swift",
        "Environment+StandardLibrary.swift",
        "Environment.swift",
        "EnvironmentVariable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
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.