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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 Zip, reference 2.1.2 (67fa55), with Swift 6.1 for Linux on 26 Apr 2025 20:16:04 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/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/marmelroy/Zip.git
Reference: 2.1.2
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/marmelroy/Zip
 * tag               2.1.2      -> FETCH_HEAD
HEAD is now at 67fa558 Release 2.1.2
Cloned https://github.com/marmelroy/Zip.git
Revision (git rev-parse @):
67fa55813b9e7b3b9acee9c0ae501def28746d76
SUCCESS checkout https://github.com/marmelroy/Zip.git at 2.1.2
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/marmelroy/Zip.git
https://github.com/marmelroy/Zip.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Zip",
  "name" : "Zip",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Zip",
      "targets" : [
        "Zip"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ZipTests",
      "module_type" : "SwiftTarget",
      "name" : "ZipTests",
      "path" : "ZipTests",
      "sources" : [
        "XCTestManifests.swift",
        "ZipTests.swift"
      ],
      "target_dependencies" : [
        "Zip"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Zip",
      "module_type" : "SwiftTarget",
      "name" : "Zip",
      "path" : "Zip",
      "product_memberships" : [
        "Zip"
      ],
      "sources" : [
        "QuickZip.swift",
        "Zip.swift",
        "ZipUtilities.swift"
      ],
      "target_dependencies" : [
        "Minizip"
      ],
      "type" : "library"
    },
    {
      "c99name" : "Minizip",
      "module_type" : "ClangTarget",
      "name" : "Minizip",
      "path" : "Zip/minizip",
      "product_memberships" : [
        "Zip"
      ],
      "sources" : [
        "ioapi.c",
        "unzip.c",
        "zip.c"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$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...
[0/5] Write sources
[1/5] Compiling Minizip ioapi.c
[2/5] Compiling Minizip unzip.c
[3/5] Compiling Minizip zip.c
[4/5] Write swift-version-24593BA9C3E375BF.txt
[6/9] Emitting module Zip
/host/spi-builder-workspace/Zip/Zip.swift:10:22: warning: using '@_implementationOnly' without enabling library evolution for 'Zip' may lead to instability during execution
  8 |
  9 | import Foundation
 10 | @_implementationOnly import Minizip
    |                      `- warning: using '@_implementationOnly' without enabling library evolution for 'Zip' may lead to instability during execution
 11 |
 12 | /// Zip error type
/host/spi-builder-workspace/Zip/Zip.swift:71:25: warning: static property 'customFileExtensions' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 69 |      Set of vaild file extensions
 70 |      */
 71 |     internal static var customFileExtensions: Set<String> = []
    |                         |- warning: static property 'customFileExtensions' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                         |- note: convert 'customFileExtensions' to a 'let' constant to make 'Sendable' shared state immutable
    |                         |- note: add '@MainActor' to make static property 'customFileExtensions' part of global actor 'MainActor'
    |                         `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 72 |
 73 |     // MARK: Lifecycle
[7/9] Compiling Zip ZipUtilities.swift
[8/9] Compiling Zip QuickZip.swift
[9/9] Compiling Zip Zip.swift
/host/spi-builder-workspace/Zip/Zip.swift:10:22: warning: using '@_implementationOnly' without enabling library evolution for 'Zip' may lead to instability during execution
  8 |
  9 | import Foundation
 10 | @_implementationOnly import Minizip
    |                      `- warning: using '@_implementationOnly' without enabling library evolution for 'Zip' may lead to instability during execution
 11 |
 12 | /// Zip error type
/host/spi-builder-workspace/Zip/Zip.swift:71:25: warning: static property 'customFileExtensions' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 69 |      Set of vaild file extensions
 70 |      */
 71 |     internal static var customFileExtensions: Set<String> = []
    |                         |- warning: static property 'customFileExtensions' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                         |- note: convert 'customFileExtensions' to a 'let' constant to make 'Sendable' shared state immutable
    |                         |- note: add '@MainActor' to make static property 'customFileExtensions' part of global actor 'MainActor'
    |                         `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 72 |
 73 |     // MARK: Lifecycle
Build complete! (6.65s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Zip",
  "name" : "Zip",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Zip",
      "targets" : [
        "Zip"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ZipTests",
      "module_type" : "SwiftTarget",
      "name" : "ZipTests",
      "path" : "ZipTests",
      "sources" : [
        "XCTestManifests.swift",
        "ZipTests.swift"
      ],
      "target_dependencies" : [
        "Zip"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Zip",
      "module_type" : "SwiftTarget",
      "name" : "Zip",
      "path" : "Zip",
      "product_memberships" : [
        "Zip"
      ],
      "sources" : [
        "QuickZip.swift",
        "Zip.swift",
        "ZipUtilities.swift"
      ],
      "target_dependencies" : [
        "Minizip"
      ],
      "type" : "library"
    },
    {
      "c99name" : "Minizip",
      "module_type" : "ClangTarget",
      "name" : "Minizip",
      "path" : "Zip/minizip",
      "product_memberships" : [
        "Zip"
      ],
      "sources" : [
        "ioapi.c",
        "unzip.c",
        "zip.c"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
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
Done.