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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 AECli, reference 0.1.0 (07b34d), with Swift 6.1 for Linux on 25 Apr 2025 20:50:13 UTC.

Swift 6 data race errors: 0

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/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/tadija/AECli.git
Reference: 0.1.0
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/tadija/AECli
 * tag               0.1.0      -> FETCH_HEAD
HEAD is now at 07b34d9 WIP
Cloned https://github.com/tadija/AECli.git
Revision (git rev-parse @):
07b34d9f01abd15b351d7168491593506905fff4
SUCCESS checkout https://github.com/tadija/AECli.git at 0.1.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/tadija/AECli.git
https://github.com/tadija/AECli.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "AECli",
  "name" : "AECli",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "AECli",
      "targets" : [
        "AECli"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "AECliTests",
      "module_type" : "SwiftTarget",
      "name" : "AECliTests",
      "path" : "Tests/AECliTests",
      "sources" : [
        "CliTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "AECli"
      ],
      "type" : "test"
    },
    {
      "c99name" : "AECli",
      "module_type" : "SwiftTarget",
      "name" : "AECli",
      "path" : "Sources/AECli",
      "product_memberships" : [
        "AECli"
      ],
      "sources" : [
        "Cli.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/host -w "$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
[3/4] Emitting module AECli
/host/spi-builder-workspace/Sources/AECli/Cli.swift:147:1: warning: extension declares a conformance of imported type 'String' to imported protocols 'Error', 'LocalizedError'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
145 | // MARK: - Helpers
146 |
147 | extension String: Error, LocalizedError {
    | |- warning: extension declares a conformance of imported type 'String' to imported protocols 'Error', 'LocalizedError'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
    | `- note: add '@retroactive' to silence this warning
148 |     public var errorDescription: String? {
149 |         self
[4/4] Compiling AECli Cli.swift
/host/spi-builder-workspace/Sources/AECli/Cli.swift:147:1: warning: extension declares a conformance of imported type 'String' to imported protocols 'Error', 'LocalizedError'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
145 | // MARK: - Helpers
146 |
147 | extension String: Error, LocalizedError {
    | |- warning: extension declares a conformance of imported type 'String' to imported protocols 'Error', 'LocalizedError'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
    | `- note: add '@retroactive' to silence this warning
148 |     public var errorDescription: String? {
149 |         self
/host/spi-builder-workspace/Sources/AECli/Cli.swift:63:50: 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
 61 |
 62 |     func error(_ error: Error) {
 63 |         fputs("\(error.localizedDescription)\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
 64 |     }
 65 |
/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
Build complete! (7.72s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "AECli",
  "name" : "AECli",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "AECli",
      "targets" : [
        "AECli"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "AECliTests",
      "module_type" : "SwiftTarget",
      "name" : "AECliTests",
      "path" : "Tests/AECliTests",
      "sources" : [
        "CliTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "AECli"
      ],
      "type" : "test"
    },
    {
      "c99name" : "AECli",
      "module_type" : "SwiftTarget",
      "name" : "AECli",
      "path" : "Sources/AECli",
      "product_memberships" : [
        "AECli"
      ],
      "sources" : [
        "Cli.swift"
      ],
      "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.