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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 TLVCoding, reference 2.2.3 (49eae2), with Swift 6.1 for Linux on 27 Apr 2025 10:41:13 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/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/pureswift/tlvcoding.git
Reference: 2.2.3
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/pureswift/tlvcoding
 * tag               2.2.3      -> FETCH_HEAD
HEAD is now at 49eae2e Updated GitHub CI
Cloned https://github.com/pureswift/tlvcoding.git
Revision (git rev-parse @):
49eae2e68320dbe1533eb2880ee82f7b6144517a
SUCCESS checkout https://github.com/pureswift/tlvcoding.git at 2.2.3
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/pureswift/tlvcoding.git
https://github.com/pureswift/tlvcoding.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "TLVCoding",
  "name" : "TLVCoding",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "TLVCoding",
      "targets" : [
        "TLVCoding"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "TLVCodingTests",
      "module_type" : "SwiftTarget",
      "name" : "TLVCodingTests",
      "path" : "Tests/TLVCodingTests",
      "sources" : [
        "TLVCodingTests.swift"
      ],
      "target_dependencies" : [
        "TLVCoding"
      ],
      "type" : "test"
    },
    {
      "c99name" : "TLVCoding",
      "module_type" : "SwiftTarget",
      "name" : "TLVCoding",
      "path" : "Sources",
      "product_memberships" : [
        "TLVCoding"
      ],
      "sources" : [
        "CodingKey.swift",
        "Data.swift",
        "DataConvertible.swift",
        "Decoder.swift",
        "Encoder.swift",
        "Format.swift",
        "Integer.swift",
        "Item.swift",
        "TLVCodable.swift",
        "TypeCode.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/host -w "$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
[3/12] Compiling TLVCoding TLVCodable.swift
[4/13] Compiling TLVCoding TypeCode.swift
[5/13] Compiling TLVCoding Integer.swift
[6/13] Compiling TLVCoding Item.swift
[7/13] Emitting module TLVCoding
/host/spi-builder-workspace/Sources/Format.swift:105:16: warning: static property 'iso8601Formatter' is not concurrency-safe because non-'Sendable' type 'ISO8601DateFormatter' may have shared mutable state; this is an error in the Swift 6 language mode
103 |
104 |     @available(macOS 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
105 |     static let iso8601Formatter: ISO8601DateFormatter = {
    |                |- warning: static property 'iso8601Formatter' is not concurrency-safe because non-'Sendable' type 'ISO8601DateFormatter' may have shared mutable state; this is an error in the Swift 6 language mode
    |                |- note: add '@MainActor' to make static property 'iso8601Formatter' part of global actor 'MainActor'
    |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
106 |         let formatter = ISO8601DateFormatter()
107 |         formatter.formatOptions = .withInternetDateTime
Foundation.ISO8601DateFormatter:1:12: note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
 1 | open class ISO8601DateFormatter : Formatter, NSSecureCoding {
   |            `- note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
 2 |     open var timeZone: TimeZone! { get set }
 3 |     open var formatOptions: ISO8601DateFormatter.Options { get set }
[8/13] Compiling TLVCoding Format.swift
/host/spi-builder-workspace/Sources/Format.swift:105:16: warning: static property 'iso8601Formatter' is not concurrency-safe because non-'Sendable' type 'ISO8601DateFormatter' may have shared mutable state; this is an error in the Swift 6 language mode
103 |
104 |     @available(macOS 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
105 |     static let iso8601Formatter: ISO8601DateFormatter = {
    |                |- warning: static property 'iso8601Formatter' is not concurrency-safe because non-'Sendable' type 'ISO8601DateFormatter' may have shared mutable state; this is an error in the Swift 6 language mode
    |                |- note: add '@MainActor' to make static property 'iso8601Formatter' part of global actor 'MainActor'
    |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
106 |         let formatter = ISO8601DateFormatter()
107 |         formatter.formatOptions = .withInternetDateTime
Foundation.ISO8601DateFormatter:1:12: note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
 1 | open class ISO8601DateFormatter : Formatter, NSSecureCoding {
   |            `- note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
 2 |     open var timeZone: TimeZone! { get set }
 3 |     open var formatOptions: ISO8601DateFormatter.Options { get set }
[9/13] Compiling TLVCoding Encoder.swift
[10/13] Compiling TLVCoding CodingKey.swift
[11/13] Compiling TLVCoding Data.swift
[12/13] Compiling TLVCoding DataConvertible.swift
[13/13] Compiling TLVCoding Decoder.swift
Build complete! (10.36s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "TLVCoding",
  "name" : "TLVCoding",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "TLVCoding",
      "targets" : [
        "TLVCoding"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "TLVCodingTests",
      "module_type" : "SwiftTarget",
      "name" : "TLVCodingTests",
      "path" : "Tests/TLVCodingTests",
      "sources" : [
        "TLVCodingTests.swift"
      ],
      "target_dependencies" : [
        "TLVCoding"
      ],
      "type" : "test"
    },
    {
      "c99name" : "TLVCoding",
      "module_type" : "SwiftTarget",
      "name" : "TLVCoding",
      "path" : "Sources",
      "product_memberships" : [
        "TLVCoding"
      ],
      "sources" : [
        "CodingKey.swift",
        "Data.swift",
        "DataConvertible.swift",
        "Decoder.swift",
        "Encoder.swift",
        "Format.swift",
        "Integer.swift",
        "Item.swift",
        "TLVCodable.swift",
        "TypeCode.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.