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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 MyPackage, reference 2.0.1 (b53b80), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 18:34:24 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/armadsen/mypackage.git
Reference: 2.0.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/armadsen/mypackage
 * tag               2.0.1      -> FETCH_HEAD
HEAD is now at b53b80b Fix a bug
Cloned https://github.com/armadsen/mypackage.git
Revision (git rev-parse @):
b53b80b737c64ed26512fc62002b858ae86f9bd0
SUCCESS checkout https://github.com/armadsen/mypackage.git at 2.0.1
========================================
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": "mypackage",
      "name": "MyPackage",
      "url": "https://github.com/armadsen/mypackage.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/mypackage",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/armadsen/mypackage.git
[1/31] Fetching mypackage
Fetched https://github.com/armadsen/mypackage.git from cache (0.54s)
Creating working copy for https://github.com/armadsen/mypackage.git
Working copy of https://github.com/armadsen/mypackage.git resolved at 2.0.1 (b53b80b)
warning: '.resolve-product-dependencies': dependency 'mypackage' 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/armadsen/mypackage.git
https://github.com/armadsen/mypackage.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "MyPackage",
  "name" : "MyPackage",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "MyPackage",
      "targets" : [
        "MyPackage"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "MyPackageTests",
      "module_type" : "SwiftTarget",
      "name" : "MyPackageTests",
      "path" : "Tests/MyPackageTests",
      "sources" : [
        "MyPackageTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "MyPackage"
      ],
      "type" : "test"
    },
    {
      "c99name" : "MyPackage",
      "module_type" : "SwiftTarget",
      "name" : "MyPackage",
      "path" : "Sources/MyPackage",
      "product_memberships" : [
        "MyPackage"
      ],
      "sources" : [
        "MyPackage.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
[3/4] Emitting module MyPackage
/Users/admin/builder/spi-builder-workspace/Sources/MyPackage/MyPackage.swift:2:16: warning: static property 'text' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
1 | public struct MyPackage {
2 |     static var text = "Hello, World!"
  |                |- warning: static property 'text' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  |                |- note: convert 'text' to a 'let' constant to make 'Sendable' shared state immutable
  |                |- note: add '@MainActor' to make static property 'text' part of global actor 'MainActor'
  |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
3 |
4 |     public static func sayHello() {
[4/4] Compiling MyPackage MyPackage.swift
/Users/admin/builder/spi-builder-workspace/Sources/MyPackage/MyPackage.swift:2:16: warning: static property 'text' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
1 | public struct MyPackage {
2 |     static var text = "Hello, World!"
  |                |- warning: static property 'text' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  |                |- note: convert 'text' to a 'let' constant to make 'Sendable' shared state immutable
  |                |- note: add '@MainActor' to make static property 'text' part of global actor 'MainActor'
  |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
3 |
4 |     public static func sayHello() {
Build complete! (0.75s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "MyPackage",
  "name" : "MyPackage",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "MyPackage",
      "targets" : [
        "MyPackage"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "MyPackageTests",
      "module_type" : "SwiftTarget",
      "name" : "MyPackageTests",
      "path" : "Tests/MyPackageTests",
      "sources" : [
        "MyPackageTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "MyPackage"
      ],
      "type" : "test"
    },
    {
      "c99name" : "MyPackage",
      "module_type" : "SwiftTarget",
      "name" : "MyPackage",
      "path" : "Sources/MyPackage",
      "product_memberships" : [
        "MyPackage"
      ],
      "sources" : [
        "MyPackage.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Done.