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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 RVS_Persistent_Prefs, reference 1.5.0 (9b9966), with Swift 6.0 for Linux on 19 Mar 2025 19:01:56 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.0-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.60.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/RiftValleySoftware/RVS_PersistentPrefs.git
Reference: 1.5.0
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/RiftValleySoftware/RVS_PersistentPrefs
 * tag               1.5.0      -> FETCH_HEAD
HEAD is now at 9b9966a Added the deleteAll() method.
Cloned https://github.com/RiftValleySoftware/RVS_PersistentPrefs.git
Revision (git rev-parse @):
9b9966a1883a534a179669820fee945e3b938813
SUCCESS checkout https://github.com/RiftValleySoftware/RVS_PersistentPrefs.git at 1.5.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.0
Building package at path:  $PWD
https://github.com/RiftValleySoftware/RVS_PersistentPrefs.git
https://github.com/RiftValleySoftware/RVS_PersistentPrefs.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "RVS_Persistent_Prefs",
  "name" : "RVS_Persistent_Prefs",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "macos",
      "version" : "10.14"
    },
    {
      "name" : "watchos",
      "version" : "5.0"
    }
  ],
  "products" : [
    {
      "name" : "RVS_Persistent_Prefs",
      "targets" : [
        "RVS_Persistent_Prefs"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RVS_Persistent_PrefsTest",
      "module_type" : "SwiftTarget",
      "name" : "RVS_Persistent_PrefsTest",
      "path" : "Tests/RVS_Persistent_PrefsTest",
      "sources" : [
        "RVS_Persistent_Prefs_MixedType_Tests.swift",
        "RVS_Persistent_Prefs_Simple_Tests.swift",
        "RVS_Persistent_Prefs_Thread_Tests.swift"
      ],
      "target_dependencies" : [
        "RVS_Persistent_Prefs"
      ],
      "type" : "test"
    },
    {
      "c99name" : "RVS_Persistent_Prefs",
      "module_type" : "SwiftTarget",
      "name" : "RVS_Persistent_Prefs",
      "path" : "Sources/RVS_Persistent_Prefs",
      "product_memberships" : [
        "RVS_Persistent_Prefs"
      ],
      "sources" : [
        "RVS_PersistentPrefs.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.0-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-6.0-latest: Pulling from finestructure/spi-images
Digest: sha256:081dcf4fb829aea9d08447f4790431afbdfbcc335bfeed728ca69c6f181ae2aa
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.0-latest
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/4] Emitting module RVS_Persistent_Prefs
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:47:24: warning: static property '_cache' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 45 |      The first key is the general prefs key, and the second key is each prefs key.
 46 |      */
 47 |     private static var _cache: [String: [String: Any]] = [:]
    |                        |- warning: static property '_cache' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: convert '_cache' to a 'let' constant to make 'Sendable' shared state immutable
    |                        |- note: annotate '_cache' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 48 |
 49 |     /* ################################################################## */
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:154:23: warning: static property 'groupID' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
152 |      However, if there is a Group ID, the [`UserDefaults`](https://developer.apple.com/documentation/foundation/userdefaults/) for that group are used.
153 |      */
154 |     public static var groupID: String?
    |                       |- warning: static property 'groupID' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'groupID' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: annotate 'groupID' with '@MainActor' if property should only be accessed from the main actor
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
155 |
156 |     /* ############################################################################################################################## */
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:208:6: error: Objective-C interoperability is disabled
206 |      You simply read and write the Dictionary, using these accessors. The saving and retrieving happens in the background.
207 |      */
208 |     @objc dynamic public var values: [String: Any] {
    |      `- error: Objective-C interoperability is disabled
209 |         get {
210 |             lastError = nil
[4/4] Compiling RVS_Persistent_Prefs RVS_PersistentPrefs.swift
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:47:24: warning: static property '_cache' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 45 |      The first key is the general prefs key, and the second key is each prefs key.
 46 |      */
 47 |     private static var _cache: [String: [String: Any]] = [:]
    |                        |- warning: static property '_cache' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: convert '_cache' to a 'let' constant to make 'Sendable' shared state immutable
    |                        |- note: annotate '_cache' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 48 |
 49 |     /* ################################################################## */
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:154:23: warning: static property 'groupID' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
152 |      However, if there is a Group ID, the [`UserDefaults`](https://developer.apple.com/documentation/foundation/userdefaults/) for that group are used.
153 |      */
154 |     public static var groupID: String?
    |                       |- warning: static property 'groupID' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'groupID' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: annotate 'groupID' with '@MainActor' if property should only be accessed from the main actor
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
155 |
156 |     /* ############################################################################################################################## */
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:208:6: error: Objective-C interoperability is disabled
206 |      You simply read and write the Dictionary, using these accessors. The saving and retrieving happens in the background.
207 |      */
208 |     @objc dynamic public var values: [String: Any] {
    |      `- error: Objective-C interoperability is disabled
209 |         get {
210 |             lastError = nil
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.0-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.0-latest: Pulling from finestructure/spi-images
Digest: sha256:081dcf4fb829aea9d08447f4790431afbdfbcc335bfeed728ca69c6f181ae2aa
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.0-latest
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-24593BA9C3E375BF.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/3] Emitting module RVS_Persistent_Prefs
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:208:6: error: Objective-C interoperability is disabled
206 |      You simply read and write the Dictionary, using these accessors. The saving and retrieving happens in the background.
207 |      */
208 |     @objc dynamic public var values: [String: Any] {
    |      `- error: Objective-C interoperability is disabled
209 |         get {
210 |             lastError = nil
[3/3] Compiling RVS_Persistent_Prefs RVS_PersistentPrefs.swift
/host/spi-builder-workspace/Sources/RVS_Persistent_Prefs/RVS_PersistentPrefs.swift:208:6: error: Objective-C interoperability is disabled
206 |      You simply read and write the Dictionary, using these accessors. The saving and retrieving happens in the background.
207 |      */
208 |     @objc dynamic public var values: [String: Any] {
    |      `- error: Objective-C interoperability is disabled
209 |         get {
210 |             lastError = nil
BUILD FAILURE 6.0 linux