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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 Commandant, reference 0.18.0 (a1671c), with Swift 6.1 for Linux on 26 Apr 2025 08:42:11 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/Carthage/Commandant.git
Reference: 0.18.0
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/Carthage/Commandant
 * tag               0.18.0     -> FETCH_HEAD
HEAD is now at a1671cf Merge pull request #159 from Carthage/release-0.18
Submodule path 'Carthage/Checkouts/Nimble': checked out 'e491a6731307bb23783bf664d003be9b2fa59ab5'
Submodule path 'Carthage/Checkouts/Quick': checked out '8a10ae40b78d2360ca56638f15fe721be8529993'
Submodule path 'Carthage/Checkouts/Quick/Externals/Nimble': checked out 'e491a6731307bb23783bf664d003be9b2fa59ab5'
Submodule path 'Carthage/Checkouts/xcconfigs': checked out '4ced0ad5a971220917994a4edfa6abf9702e3818'
Submodule 'Carthage/Checkouts/Nimble' (https://github.com/Quick/Nimble.git) registered for path 'Carthage/Checkouts/Nimble'
Submodule 'Carthage/Checkouts/Quick' (https://github.com/Quick/Quick.git) registered for path 'Carthage/Checkouts/Quick'
Submodule 'Carthage/Checkouts/xcconfigs' (https://github.com/jspahrsummers/xcconfigs.git) registered for path 'Carthage/Checkouts/xcconfigs'
Cloning into '/host/spi-builder-workspace/Carthage/Checkouts/Nimble'...
Cloning into '/host/spi-builder-workspace/Carthage/Checkouts/Quick'...
Cloning into '/host/spi-builder-workspace/Carthage/Checkouts/xcconfigs'...
Submodule 'Externals/Nimble' (https://github.com/Quick/Nimble.git) registered for path 'Carthage/Checkouts/Quick/Externals/Nimble'
Cloning into '/host/spi-builder-workspace/Carthage/Checkouts/Quick/Externals/Nimble'...
Cloned https://github.com/Carthage/Commandant.git
Revision (git rev-parse @):
a1671cf728db837cf5ec1980a80d276bbba748f6
SUCCESS checkout https://github.com/Carthage/Commandant.git at 0.18.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/Carthage/Commandant.git
https://github.com/Carthage/Commandant.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "quick",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "3.1.0",
            "upper_bound" : "4.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Quick.git"
    },
    {
      "identity" : "nimble",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "9.0.0",
            "upper_bound" : "10.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Nimble.git"
    }
  ],
  "manifest_display_name" : "Commandant",
  "name" : "Commandant",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Commandant",
      "targets" : [
        "Commandant"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "CommandantTests",
      "module_type" : "SwiftTarget",
      "name" : "CommandantTests",
      "path" : "Tests/CommandantTests",
      "product_dependencies" : [
        "Quick",
        "Nimble"
      ],
      "sources" : [
        "CommandSpec.swift",
        "OptionSpec.swift",
        "OptionsWithEnumProtocolSpec.swift",
        "OrderedSetSpec.swift"
      ],
      "target_dependencies" : [
        "Commandant"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Commandant",
      "module_type" : "SwiftTarget",
      "name" : "Commandant",
      "path" : "Sources/Commandant",
      "product_memberships" : [
        "Commandant"
      ],
      "sources" : [
        "Argument.swift",
        "ArgumentParser.swift",
        "ArgumentProtocol.swift",
        "Command.swift",
        "Errors.swift",
        "HelpCommand.swift",
        "Option.swift",
        "OrderedSet.swift",
        "Result+Additions.swift",
        "Switch.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/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
Fetching https://github.com/Quick/Quick.git
Fetching https://github.com/Quick/Nimble.git
[1/14755] Fetching quick
[10920/34322] Fetching quick, nimble
Fetched https://github.com/Quick/Quick.git from cache (1.08s)
Fetched https://github.com/Quick/Nimble.git from cache (1.09s)
Computing version for https://github.com/Quick/Quick.git
Computed https://github.com/Quick/Quick.git at 3.1.2 (1.56s)
Computing version for https://github.com/Quick/Nimble.git
Computed https://github.com/Quick/Nimble.git at 9.2.1 (0.46s)
Fetching https://github.com/mattgallagher/CwlPreconditionTesting.git
[1/1257] Fetching cwlpreconditiontesting
Fetched https://github.com/mattgallagher/CwlPreconditionTesting.git from cache (0.18s)
Computing version for https://github.com/mattgallagher/CwlPreconditionTesting.git
Computed https://github.com/mattgallagher/CwlPreconditionTesting.git at 2.2.2 (0.63s)
Fetching https://github.com/mattgallagher/CwlCatchException.git
[1/455] Fetching cwlcatchexception
Fetched https://github.com/mattgallagher/CwlCatchException.git from cache (0.16s)
Computing version for https://github.com/mattgallagher/CwlCatchException.git
Computed https://github.com/mattgallagher/CwlCatchException.git at 2.2.1 (0.61s)
Creating working copy for https://github.com/Quick/Nimble.git
Working copy of https://github.com/Quick/Nimble.git resolved at 9.2.1
Creating working copy for https://github.com/mattgallagher/CwlCatchException.git
Working copy of https://github.com/mattgallagher/CwlCatchException.git resolved at 2.2.1
Creating working copy for https://github.com/Quick/Quick.git
Working copy of https://github.com/Quick/Quick.git resolved at 3.1.2
Creating working copy for https://github.com/mattgallagher/CwlPreconditionTesting.git
Working copy of https://github.com/mattgallagher/CwlPreconditionTesting.git resolved at 2.2.2
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/12] Compiling Commandant OrderedSet.swift
[4/12] Compiling Commandant Result+Additions.swift
[5/13] Compiling Commandant Switch.swift
[6/13] Compiling Commandant Option.swift
/host/spi-builder-workspace/Sources/Commandant/Option.swift:239:32: error: instance method 'contains' requires that 'String.Element' (aka 'Character') conform to 'Collection'
237 | 			let components = unwrappedStringValue.split(
238 | 				omittingEmptySubsequences: true,
239 | 				whereSeparator: [",", " "].contains
    |                                `- error: instance method 'contains' requires that 'String.Element' (aka 'Character') conform to 'Collection'
240 | 			)
241 | 			var resultValues: [T] = []
_StringProcessing.Collection.contains:3:15: note: where 'C' = 'String.Element' (aka 'Character')
1 | protocol Collection {
2 | @available(macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0, *)
3 |   public func contains<C>(_ other: C) -> Bool where C : Collection, Self.Element == C.Element}
  |               `- note: where 'C' = 'String.Element' (aka 'Character')
4 |
[7/13] Emitting module Commandant
/host/spi-builder-workspace/Sources/Commandant/Errors.swift:20:7: warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 13 | /// `ClientError` should be the type of error (if any) that can occur when
 14 | /// running commands.
 15 | public enum CommandantError<ClientError>: Error {
    |                             `- note: consider making generic parameter 'ClientError' conform to the 'Sendable' protocol
 16 | 	/// An option was used incorrectly.
 17 | 	case usageError(description: String)
 18 |
 19 | 	/// An error occurred while running a command.
 20 | 	case commandError(ClientError)
    |       `- warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 21 | }
 22 |
[8/13] Compiling Commandant Errors.swift
/host/spi-builder-workspace/Sources/Commandant/Errors.swift:20:7: warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 13 | /// `ClientError` should be the type of error (if any) that can occur when
 14 | /// running commands.
 15 | public enum CommandantError<ClientError>: Error {
    |                             `- note: consider making generic parameter 'ClientError' conform to the 'Sendable' protocol
 16 | 	/// An option was used incorrectly.
 17 | 	case usageError(description: String)
 18 |
 19 | 	/// An error occurred while running a command.
 20 | 	case commandError(ClientError)
    |       `- warning: associated value 'commandError' of 'Sendable'-conforming generic enum 'CommandantError' has non-sendable type 'ClientError'; this is an error in the Swift 6 language mode
 21 | }
 22 |
[9/13] Compiling Commandant ArgumentProtocol.swift
/host/spi-builder-workspace/Sources/Commandant/Command.swift:180:31: warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
178 | 			switch error {
179 | 			case let .usageError(description):
180 | 				fputs(description + "\n", stderr)
    |                               `- warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
181 |
182 | 			case let .commandError(error):
/usr/include/stdio.h:145:14: note: var declared here
143 | extern FILE *stdin;		/* Standard input stream.  */
144 | extern FILE *stdout;		/* Standard output stream.  */
145 | extern FILE *stderr;		/* Standard error output stream.  */
    |              `- note: var declared here
146 | /* C89/C99 say they're macros.  Make them happy.  */
147 | #define stdin stdin
/host/spi-builder-workspace/Sources/Commandant/Command.swift:193:78: warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
191 | 			}
192 |
193 | 			fputs("Unrecognized command: '\(verb)'. See `\(executableName) help`.\n", stderr)
    |                                                                              `- warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
194 | 			exit(EXIT_FAILURE)
195 | 		}
/usr/include/stdio.h:145:14: note: var declared here
143 | extern FILE *stdin;		/* Standard input stream.  */
144 | extern FILE *stdout;		/* Standard output stream.  */
145 | extern FILE *stderr;		/* Standard error output stream.  */
    |              `- note: var declared here
146 | /* C89/C99 say they're macros.  Make them happy.  */
147 | #define stdin stdin
[10/13] Compiling Commandant Command.swift
/host/spi-builder-workspace/Sources/Commandant/Command.swift:180:31: warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
178 | 			switch error {
179 | 			case let .usageError(description):
180 | 				fputs(description + "\n", stderr)
    |                               `- warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
181 |
182 | 			case let .commandError(error):
/usr/include/stdio.h:145:14: note: var declared here
143 | extern FILE *stdin;		/* Standard input stream.  */
144 | extern FILE *stdout;		/* Standard output stream.  */
145 | extern FILE *stderr;		/* Standard error output stream.  */
    |              `- note: var declared here
146 | /* C89/C99 say they're macros.  Make them happy.  */
147 | #define stdin stdin
/host/spi-builder-workspace/Sources/Commandant/Command.swift:193:78: warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
191 | 			}
192 |
193 | 			fputs("Unrecognized command: '\(verb)'. See `\(executableName) help`.\n", stderr)
    |                                                                              `- warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
194 | 			exit(EXIT_FAILURE)
195 | 		}
/usr/include/stdio.h:145:14: note: var declared here
143 | extern FILE *stdin;		/* Standard input stream.  */
144 | extern FILE *stdout;		/* Standard output stream.  */
145 | extern FILE *stderr;		/* Standard error output stream.  */
    |              `- note: var declared here
146 | /* C89/C99 say they're macros.  Make them happy.  */
147 | #define stdin stdin
[11/13] Compiling Commandant Argument.swift
[12/13] Compiling Commandant ArgumentParser.swift
[13/13] Compiling Commandant HelpCommand.swift
/host/spi-builder-workspace/Sources/Commandant/HelpCommand.swift:44:48: warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
42 | 				return .success(())
43 | 			} else {
44 | 				fputs("Unrecognized command: '\(verb)'\n", stderr)
   |                                                `- warning: reference to var 'stderr' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
45 | 			}
46 | 		}
/usr/include/stdio.h:145:14: note: var declared here
143 | extern FILE *stdin;		/* Standard input stream.  */
144 | extern FILE *stdout;		/* Standard output stream.  */
145 | extern FILE *stderr;		/* Standard error output stream.  */
    |              `- note: var declared here
146 | /* C89/C99 say they're macros.  Make them happy.  */
147 | #define stdin stdin
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 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
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-24593BA9C3E375BF.txt
[2/11] Compiling Commandant Result+Additions.swift
[3/12] Compiling Commandant OrderedSet.swift
[4/12] Compiling Commandant Option.swift
[5/12] Compiling Commandant Errors.swift
[6/12] Compiling Commandant HelpCommand.swift
[7/12] Compiling Commandant Switch.swift
[8/12] Emitting module Commandant
[9/12] Compiling Commandant Argument.swift
[10/12] Compiling Commandant ArgumentParser.swift
[11/12] Compiling Commandant ArgumentProtocol.swift
[12/12] Compiling Commandant Command.swift
Build complete! (3.49s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "quick",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "3.1.0",
            "upper_bound" : "4.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Quick.git"
    },
    {
      "identity" : "nimble",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "9.0.0",
            "upper_bound" : "10.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/Quick/Nimble.git"
    }
  ],
  "manifest_display_name" : "Commandant",
  "name" : "Commandant",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Commandant",
      "targets" : [
        "Commandant"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "CommandantTests",
      "module_type" : "SwiftTarget",
      "name" : "CommandantTests",
      "path" : "Tests/CommandantTests",
      "product_dependencies" : [
        "Quick",
        "Nimble"
      ],
      "sources" : [
        "CommandSpec.swift",
        "OptionSpec.swift",
        "OptionsWithEnumProtocolSpec.swift",
        "OrderedSetSpec.swift"
      ],
      "target_dependencies" : [
        "Commandant"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Commandant",
      "module_type" : "SwiftTarget",
      "name" : "Commandant",
      "path" : "Sources/Commandant",
      "product_memberships" : [
        "Commandant"
      ],
      "sources" : [
        "Argument.swift",
        "ArgumentParser.swift",
        "ArgumentProtocol.swift",
        "Command.swift",
        "Errors.swift",
        "HelpCommand.swift",
        "Option.swift",
        "OrderedSet.swift",
        "Result+Additions.swift",
        "Switch.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
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.