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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 macOS (SPM) on 27 Apr 2025 10:47:25 UTC.

Swift 6 data race errors: 1

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -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

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 /Users/admin/builder/spi-builder-workspace/.git/
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
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "tlvcoding",
      "name": "TLVCoding",
      "url": "https://github.com/pureswift/tlvcoding.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/tlvcoding",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/pureswift/tlvcoding.git
[7/655] Fetching tlvcoding
Fetched https://github.com/pureswift/tlvcoding.git from cache (0.78s)
Creating working copy for https://github.com/pureswift/tlvcoding.git
Working copy of https://github.com/pureswift/tlvcoding.git resolved at 2.2.3 (49eae2e)
warning: '.resolve-product-dependencies': dependency 'tlvcoding' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/pureswift/tlvcoding.git
https://github.com/pureswift/tlvcoding.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "TLVCoding",
  "name" : "TLVCoding",
  "path" : "/Users/admin/builder/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 ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/12] Compiling TLVCoding TLVCodable.swift
[4/13] Compiling TLVCoding Encoder.swift
[5/13] Compiling TLVCoding Integer.swift
[6/13] Compiling TLVCoding Item.swift
[7/13] Compiling TLVCoding Format.swift
/Users/admin/builder/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
/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSISO8601DateFormatter.h:46:12: note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
44 |
45 | API_AVAILABLE(macosx(10.12), ios(10.0), watchos(3.0), tvos(10.0))
46 | @interface NSISO8601DateFormatter : NSFormatter <NSSecureCoding> {
   |            `- note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
47 | @private
48 |     CFDateFormatterRef _formatter;
[8/13] Compiling TLVCoding Decoder.swift
[9/13] Compiling TLVCoding CodingKey.swift
[10/13] Compiling TLVCoding Data.swift
[11/13] Compiling TLVCoding DataConvertible.swift
[12/13] Emitting module TLVCoding
/Users/admin/builder/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
/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSISO8601DateFormatter.h:46:12: note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
44 |
45 | API_AVAILABLE(macosx(10.12), ios(10.0), watchos(3.0), tvos(10.0))
46 | @interface NSISO8601DateFormatter : NSFormatter <NSSecureCoding> {
   |            `- note: class 'ISO8601DateFormatter' does not conform to the 'Sendable' protocol
47 | @private
48 |     CFDateFormatterRef _formatter;
[13/13] Compiling TLVCoding TypeCode.swift
Build complete! (5.01s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "TLVCoding",
  "name" : "TLVCoding",
  "path" : "/Users/admin/builder/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"
}
Done.