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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 StringTemplate, reference v2.2.0 (dcf404), with Swift 6.1 for Linux on 27 Apr 2025 08:02:15 UTC.

Swift 6 data race errors: 2

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/square/StringTemplate.git
Reference: v2.2.0
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/square/StringTemplate
 * tag               v2.2.0     -> FETCH_HEAD
HEAD is now at dcf4043 Bump version: 2.2.0
Cloned https://github.com/square/StringTemplate.git
Revision (git rev-parse @):
dcf40439eeca1e03913779f242d98dc6b498b666
SUCCESS checkout https://github.com/square/StringTemplate.git at v2.2.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/square/StringTemplate.git
https://github.com/square/StringTemplate.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "StringTemplate",
  "name" : "StringTemplate",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "macos",
      "version" : "10.13"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "watchos",
      "version" : "4.0"
    }
  ],
  "products" : [
    {
      "name" : "StringTemplate",
      "targets" : [
        "StringTemplate"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "StringTemplateTests",
      "module_type" : "SwiftTarget",
      "name" : "StringTemplateTests",
      "path" : "Tests",
      "sources" : [
        "StringTemplateTests.swift"
      ],
      "target_dependencies" : [
        "StringTemplate"
      ],
      "type" : "test"
    },
    {
      "c99name" : "StringTemplate",
      "module_type" : "SwiftTarget",
      "name" : "StringTemplate",
      "path" : "Sources",
      "product_memberships" : [
        "StringTemplate"
      ],
      "sources" : [
        "CharacterSet+Character.swift",
        "String+CharacterSet.swift",
        "String+Template.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$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...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/6] Compiling StringTemplate String+Template.swift
/host/spi-builder-workspace/Sources/String+Template.swift:66:31: warning: static property 'allowPartial' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
 44 |          Options for how to apply the template
 45 |          */
 46 |         public struct Options: OptionSet {
    |                       `- note: consider making struct 'Options' conform to the 'Sendable' protocol
 47 |             public let rawValue: Int
 48 |
    :
 64 |              ```
 65 |              */
 66 |             public static let allowPartial = Options(rawValue: 1)
    |                               |- warning: static property 'allowPartial' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
    |                               |- note: add '@MainActor' to make static property 'allowPartial' part of global actor 'MainActor'
    |                               `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 67 |
 68 |             /**
/host/spi-builder-workspace/Sources/String+Template.swift:78:31: warning: static property 'allowOverflow' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
 44 |          Options for how to apply the template
 45 |          */
 46 |         public struct Options: OptionSet {
    |                       `- note: consider making struct 'Options' conform to the 'Sendable' protocol
 47 |             public let rawValue: Int
 48 |
    :
 76 |              ```
 77 |              */
 78 |             public static let allowOverflow = Options(rawValue: 2)
    |                               |- warning: static property 'allowOverflow' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
    |                               |- note: add '@MainActor' to make static property 'allowOverflow' part of global actor 'MainActor'
    |                               `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 79 |         }
 80 |
[4/6] Compiling StringTemplate String+CharacterSet.swift
[5/6] Emitting module StringTemplate
/host/spi-builder-workspace/Sources/String+Template.swift:66:31: warning: static property 'allowPartial' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
 44 |          Options for how to apply the template
 45 |          */
 46 |         public struct Options: OptionSet {
    |                       `- note: consider making struct 'Options' conform to the 'Sendable' protocol
 47 |             public let rawValue: Int
 48 |
    :
 64 |              ```
 65 |              */
 66 |             public static let allowPartial = Options(rawValue: 1)
    |                               |- warning: static property 'allowPartial' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
    |                               |- note: add '@MainActor' to make static property 'allowPartial' part of global actor 'MainActor'
    |                               `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 67 |
 68 |             /**
/host/spi-builder-workspace/Sources/String+Template.swift:78:31: warning: static property 'allowOverflow' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
 44 |          Options for how to apply the template
 45 |          */
 46 |         public struct Options: OptionSet {
    |                       `- note: consider making struct 'Options' conform to the 'Sendable' protocol
 47 |             public let rawValue: Int
 48 |
    :
 76 |              ```
 77 |              */
 78 |             public static let allowOverflow = Options(rawValue: 2)
    |                               |- warning: static property 'allowOverflow' is not concurrency-safe because non-'Sendable' type 'String.Template.Options' may have shared mutable state; this is an error in the Swift 6 language mode
    |                               |- note: add '@MainActor' to make static property 'allowOverflow' part of global actor 'MainActor'
    |                               `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 79 |         }
 80 |
[6/6] Compiling StringTemplate CharacterSet+Character.swift
Build complete! (6.53s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "StringTemplate",
  "name" : "StringTemplate",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "macos",
      "version" : "10.13"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "watchos",
      "version" : "4.0"
    }
  ],
  "products" : [
    {
      "name" : "StringTemplate",
      "targets" : [
        "StringTemplate"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "StringTemplateTests",
      "module_type" : "SwiftTarget",
      "name" : "StringTemplateTests",
      "path" : "Tests",
      "sources" : [
        "StringTemplateTests.swift"
      ],
      "target_dependencies" : [
        "StringTemplate"
      ],
      "type" : "test"
    },
    {
      "c99name" : "StringTemplate",
      "module_type" : "SwiftTarget",
      "name" : "StringTemplate",
      "path" : "Sources",
      "product_memberships" : [
        "StringTemplate"
      ],
      "sources" : [
        "CharacterSet+Character.swift",
        "String+CharacterSet.swift",
        "String+Template.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.