The Swift Package Index logo.Swift Package Index

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 Localizer, reference master (a87d97), with Swift 6.1 for macOS (SPM) on 25 Apr 2025 15:18:40 UTC.

Swift 6 data race errors: 1

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/mihaelisaev/Localizer.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/mihaelisaev/Localizer
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at a87d971 Update README.md
Cloned https://github.com/mihaelisaev/Localizer.git
Revision (git rev-parse @):
a87d971d0e5421d30cb89b5ac7411714a11e47ae
SUCCESS checkout https://github.com/mihaelisaev/Localizer.git at master
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "localizer",
      "name": "Localizer",
      "url": "https://github.com/mihaelisaev/Localizer.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Localizer",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/mihaelisaev/Localizer.git
[1/46] Fetching localizer
Fetched https://github.com/mihaelisaev/Localizer.git from cache (0.59s)
Creating working copy for https://github.com/mihaelisaev/Localizer.git
Working copy of https://github.com/mihaelisaev/Localizer.git resolved at master (a87d971)
warning: '.resolve-product-dependencies': dependency 'localizer' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/mihaelisaev/Localizer.git
https://github.com/mihaelisaev/Localizer.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Localizer",
  "name" : "Localizer",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Localizer",
      "targets" : [
        "Localizer"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LocalizerTests",
      "module_type" : "SwiftTarget",
      "name" : "LocalizerTests",
      "path" : "Tests/LocalizerTests",
      "sources" : [
        "LocalizerTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Localizer"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Localizer",
      "module_type" : "SwiftTarget",
      "name" : "Localizer",
      "path" : "Classes",
      "product_memberships" : [
        "Localizer"
      ],
      "sources" : [
        "Language.swift",
        "Localizable.swift",
        "LocalizedString.swift",
        "Localizer.swift",
        "String+LocalizedString.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/8] Compiling Localizer Localizer.swift
/Users/admin/builder/spi-builder-workspace/Classes/Localizer.swift:3:13: warning: var 'localizer' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 1 | import Foundation
 2 |
 3 | private var localizer = Localizer()
   |             |- warning: var 'localizer' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |             |- note: convert 'localizer' to a 'let' constant to make 'Sendable' shared state immutable
   |             |- note: add '@MainActor' to make var 'localizer' part of global actor 'MainActor'
   |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 4 |
 5 | public final class Localizer: Localizable {
[4/8] Compiling Localizer String+LocalizedString.swift
[5/8] Compiling Localizer LocalizedString.swift
[6/8] Emitting module Localizer
/Users/admin/builder/spi-builder-workspace/Classes/Localizer.swift:3:13: warning: var 'localizer' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 1 | import Foundation
 2 |
 3 | private var localizer = Localizer()
   |             |- warning: var 'localizer' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |             |- note: convert 'localizer' to a 'let' constant to make 'Sendable' shared state immutable
   |             |- note: add '@MainActor' to make var 'localizer' part of global actor 'MainActor'
   |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 4 |
 5 | public final class Localizer: Localizable {
[7/8] Compiling Localizer Language.swift
[8/8] Compiling Localizer Localizable.swift
Build complete! (4.19s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Localizer",
  "name" : "Localizer",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Localizer",
      "targets" : [
        "Localizer"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LocalizerTests",
      "module_type" : "SwiftTarget",
      "name" : "LocalizerTests",
      "path" : "Tests/LocalizerTests",
      "sources" : [
        "LocalizerTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Localizer"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Localizer",
      "module_type" : "SwiftTarget",
      "name" : "Localizer",
      "path" : "Classes",
      "product_memberships" : [
        "Localizer"
      ],
      "sources" : [
        "Language.swift",
        "Localizable.swift",
        "LocalizedString.swift",
        "Localizer.swift",
        "String+LocalizedString.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Done.