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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

Failed to build swift-tts, reference main (9e74c8), with Swift 6.1 for macOS (SPM) on 27 Apr 2025 11:15:15 UTC.

Build Command

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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/renaudjenny/swift-tts.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/renaudjenny/swift-tts
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 9e74c8f docs(README): add badges
Cloned https://github.com/renaudjenny/swift-tts.git
Revision (git rev-parse @):
9e74c8faf2fbd5f9caf31c25cf07d6f7cd3d1e29
SUCCESS checkout https://github.com/renaudjenny/swift-tts.git at main
Fetching https://github.com/pointfreeco/swift-clocks from cache
Fetching https://github.com/pointfreeco/swift-dependencies from cache
Fetching https://github.com/pointfreeco/xctest-dynamic-overlay from cache
Fetching https://github.com/pointfreeco/combine-schedulers from cache
Fetched https://github.com/pointfreeco/combine-schedulers from cache (0.43s)
Fetched https://github.com/pointfreeco/swift-clocks from cache (0.64s)
Fetched https://github.com/pointfreeco/xctest-dynamic-overlay from cache (0.64s)
Fetched https://github.com/pointfreeco/swift-dependencies from cache (0.65s)
Computing version for https://github.com/pointfreeco/swift-dependencies
Computed https://github.com/pointfreeco/swift-dependencies at 0.2.0 (1.27s)
Computing version for https://github.com/pointfreeco/xctest-dynamic-overlay
Computed https://github.com/pointfreeco/xctest-dynamic-overlay at 0.8.4 (0.58s)
Computing version for https://github.com/pointfreeco/swift-clocks
Computed https://github.com/pointfreeco/swift-clocks at 0.2.0 (0.57s)
Computing version for https://github.com/pointfreeco/combine-schedulers
Computed https://github.com/pointfreeco/combine-schedulers at 0.9.1 (0.59s)
Creating working copy for https://github.com/pointfreeco/xctest-dynamic-overlay
Working copy of https://github.com/pointfreeco/xctest-dynamic-overlay resolved at 0.8.4
Creating working copy for https://github.com/pointfreeco/combine-schedulers
Working copy of https://github.com/pointfreeco/combine-schedulers resolved at 0.9.1
Creating working copy for https://github.com/pointfreeco/swift-clocks
Working copy of https://github.com/pointfreeco/swift-clocks resolved at 0.2.0
Creating working copy for https://github.com/pointfreeco/swift-dependencies
Working copy of https://github.com/pointfreeco/swift-dependencies resolved at 0.2.0
========================================
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": "swift-tts",
      "name": "swift-tts",
      "url": "https://github.com/renaudjenny/swift-tts.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-tts",
      "dependencies": [
        {
          "identity": "swift-dependencies",
          "name": "swift-dependencies",
          "url": "https://github.com/pointfreeco/swift-dependencies",
          "version": "0.6.0",
          "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-dependencies",
          "dependencies": [
            {
              "identity": "combine-schedulers",
              "name": "combine-schedulers",
              "url": "https://github.com/pointfreeco/combine-schedulers",
              "version": "0.11.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/combine-schedulers",
              "dependencies": [
                {
                  "identity": "swift-concurrency-extras",
                  "name": "swift-concurrency-extras",
                  "url": "https://github.com/pointfreeco/swift-concurrency-extras",
                  "version": "0.1.2",
                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-concurrency-extras",
                  "dependencies": [
                  ]
                },
                {
                  "identity": "xctest-dynamic-overlay",
                  "name": "xctest-dynamic-overlay",
                  "url": "https://github.com/pointfreeco/xctest-dynamic-overlay",
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                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/xctest-dynamic-overlay",
                  "dependencies": [
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            },
            {
              "identity": "swift-clocks",
              "name": "swift-clocks",
              "url": "https://github.com/pointfreeco/swift-clocks",
              "version": "0.4.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-clocks",
              "dependencies": [
                {
                  "identity": "swift-concurrency-extras",
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                  "url": "https://github.com/pointfreeco/swift-concurrency-extras",
                  "version": "0.1.2",
                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-concurrency-extras",
                  "dependencies": [
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                },
                {
                  "identity": "xctest-dynamic-overlay",
                  "name": "xctest-dynamic-overlay",
                  "url": "https://github.com/pointfreeco/xctest-dynamic-overlay",
                  "version": "0.9.0",
                  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/xctest-dynamic-overlay",
                  "dependencies": [
                  ]
                }
              ]
            },
            {
              "identity": "swift-concurrency-extras",
              "name": "swift-concurrency-extras",
              "url": "https://github.com/pointfreeco/swift-concurrency-extras",
              "version": "0.1.2",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-concurrency-extras",
              "dependencies": [
              ]
            },
            {
              "identity": "xctest-dynamic-overlay",
              "name": "xctest-dynamic-overlay",
              "url": "https://github.com/pointfreeco/xctest-dynamic-overlay",
              "version": "0.9.0",
              "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/xctest-dynamic-overlay",
              "dependencies": [
              ]
            }
          ]
        }
      ]
    }
  ]
}
Fetching https://github.com/renaudjenny/swift-tts.git
[1/90] Fetching swift-tts
Fetched https://github.com/renaudjenny/swift-tts.git from cache (0.61s)
Fetching https://github.com/pointfreeco/swift-dependencies from cache
Fetched https://github.com/pointfreeco/swift-dependencies from cache (0.46s)
Computing version for https://github.com/pointfreeco/swift-dependencies
Computed https://github.com/pointfreeco/swift-dependencies at 0.6.0 (1.07s)
Fetching https://github.com/pointfreeco/xctest-dynamic-overlay from cache
Fetching https://github.com/pointfreeco/combine-schedulers from cache
Fetching https://github.com/pointfreeco/swift-clocks from cache
Fetching https://github.com/pointfreeco/swift-concurrency-extras from cache
Fetched https://github.com/pointfreeco/xctest-dynamic-overlay from cache (0.48s)
Fetched https://github.com/pointfreeco/swift-clocks from cache (0.48s)
Fetched https://github.com/pointfreeco/combine-schedulers from cache (0.48s)
Fetched https://github.com/pointfreeco/swift-concurrency-extras from cache (0.48s)
Computing version for https://github.com/pointfreeco/swift-clocks
Computed https://github.com/pointfreeco/swift-clocks at 0.4.0 (1.07s)
Computing version for https://github.com/pointfreeco/combine-schedulers
Computed https://github.com/pointfreeco/combine-schedulers at 0.11.0 (0.55s)
Computing version for https://github.com/pointfreeco/swift-concurrency-extras
Computed https://github.com/pointfreeco/swift-concurrency-extras at 0.1.2 (0.57s)
Computing version for https://github.com/pointfreeco/xctest-dynamic-overlay
Computed https://github.com/pointfreeco/xctest-dynamic-overlay at 0.9.0 (0.03s)
Creating working copy for https://github.com/pointfreeco/combine-schedulers
Working copy of https://github.com/pointfreeco/combine-schedulers resolved at 0.11.0
Creating working copy for https://github.com/pointfreeco/swift-dependencies
Working copy of https://github.com/pointfreeco/swift-dependencies resolved at 0.6.0
Creating working copy for https://github.com/pointfreeco/xctest-dynamic-overlay
Working copy of https://github.com/pointfreeco/xctest-dynamic-overlay resolved at 0.9.0
Creating working copy for https://github.com/pointfreeco/swift-concurrency-extras
Working copy of https://github.com/pointfreeco/swift-concurrency-extras resolved at 0.1.2
Creating working copy for https://github.com/pointfreeco/swift-clocks
Working copy of https://github.com/pointfreeco/swift-clocks resolved at 0.4.0
Creating working copy for https://github.com/renaudjenny/swift-tts.git
Working copy of https://github.com/renaudjenny/swift-tts.git resolved at main (9e74c8f)
warning: '.resolve-product-dependencies': dependency 'swift-tts' is not used by any target
Found 1 product dependencies
  - swift-dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/renaudjenny/swift-tts.git
https://github.com/renaudjenny/swift-tts.git
{
  "dependencies" : [
    {
      "identity" : "swift-dependencies",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.2.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/pointfreeco/swift-dependencies"
    }
  ],
  "manifest_display_name" : "swift-tts",
  "name" : "swift-tts",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "macos",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftTTS",
      "targets" : [
        "SwiftTTS"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "SwiftTTSDependency",
      "targets" : [
        "SwiftTTSDependency"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "SwiftTTSCombine",
      "targets" : [
        "SwiftTTSCombine"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftTTSTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftTTSTests",
      "path" : "Tests/SwiftTTSTests",
      "sources" : [
        "SwiftTTSTests.swift"
      ],
      "target_dependencies" : [
        "SwiftTTS"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftTTSDependency",
      "module_type" : "SwiftTarget",
      "name" : "SwiftTTSDependency",
      "path" : "Sources/SwiftTTSDependency",
      "product_dependencies" : [
        "Dependencies"
      ],
      "product_memberships" : [
        "SwiftTTSDependency"
      ],
      "sources" : [
        "SwiftTTSDependency.swift"
      ],
      "target_dependencies" : [
        "SwiftTTS"
      ],
      "type" : "library"
    },
    {
      "c99name" : "SwiftTTSCombine",
      "module_type" : "SwiftTarget",
      "name" : "SwiftTTSCombine",
      "path" : "Sources/SwiftTTSCombine",
      "product_memberships" : [
        "SwiftTTSCombine"
      ],
      "sources" : [
        "SwiftTTSCombine.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "SwiftTTS",
      "module_type" : "SwiftTarget",
      "name" : "SwiftTTS",
      "path" : "Sources/SwiftTTS",
      "product_memberships" : [
        "SwiftTTS",
        "SwiftTTSDependency"
      ],
      "sources" : [
        "SwiftTTS.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
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...
[0/8] Write sources
[7/8] Write swift-version-2F0A5646E1D333AE.txt
[9/21] Compiling XCTestDynamicOverlay Deprecations.swift
[10/21] Compiling XCTestDynamicOverlay XCTCurrentTestCase.swift
[11/21] Compiling XCTestDynamicOverlay RuntimeWarnings.swift
[12/21] Compiling XCTestDynamicOverlay Unimplemented.swift
[13/21] Compiling XCTestDynamicOverlay XCTIsTesting.swift
[14/21] Compiling XCTestDynamicOverlay XCTFail.swift
[15/21] Compiling XCTestDynamicOverlay GeneratePlaceholder.swift
[16/21] Emitting module XCTestDynamicOverlay
[17/21] Compiling XCTestDynamicOverlay DefaultInitializable.swift
error: emit-module command failed with exit code 1 (use -v to see invocation)
[18/43] Emitting module SwiftTTS
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTS/SwiftTTS.swift:2:8: error: This library is not compatible with macOS
  1 | #if os(macOS)
  2 | #error("This library is not compatible with macOS")
    |        `- error: This library is not compatible with macOS
  3 | #endif
  4 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTS/SwiftTTS.swift:37:9: warning: stored property 'rateRatio' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
 35 | private final class Engine: NSObject, AVSpeechSynthesizerDelegate {
 36 |
 37 |     var rateRatio: Float
    |         `- warning: stored property 'rateRatio' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
 38 |     var voice: AVSpeechSynthesisVoice?
 39 |     var isSpeaking: ((Bool) -> Void)?
[19/43] Compiling SwiftTTS SwiftTTS.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTS/SwiftTTS.swift:2:8: error: This library is not compatible with macOS
  1 | #if os(macOS)
  2 | #error("This library is not compatible with macOS")
    |        `- error: This library is not compatible with macOS
  3 | #endif
  4 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTS/SwiftTTS.swift:37:9: warning: stored property 'rateRatio' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
 35 | private final class Engine: NSObject, AVSpeechSynthesizerDelegate {
 36 |
 37 |     var rateRatio: Float
    |         `- warning: stored property 'rateRatio' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
 38 |     var voice: AVSpeechSynthesisVoice?
 39 |     var isSpeaking: ((Bool) -> Void)?
error: emit-module command failed with exit code 1 (use -v to see invocation)
[20/43] Emitting module SwiftTTSCombine
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTSCombine/SwiftTTSCombine.swift:2:8: error: This library is not compatible with macOS
 1 | #if os(macOS)
 2 | #error("This library is not compatible with macOS")
   |        `- error: This library is not compatible with macOS
 3 | #endif
 4 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTSCombine/SwiftTTSCombine.swift:18:28: warning: stored property '_isSpeaking' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
16 |
17 | public final class Engine: NSObject, ObservableObject {
18 |     @Published private var isSpeaking: Bool = false
   |                            `- warning: stored property '_isSpeaking' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
19 |     @Published private var speakingProgress: Double = 0.0
20 |     public var rateRatio: Float
[21/43] Compiling SwiftTTSCombine SwiftTTSCombine.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTSCombine/SwiftTTSCombine.swift:2:8: error: This library is not compatible with macOS
 1 | #if os(macOS)
 2 | #error("This library is not compatible with macOS")
   |        `- error: This library is not compatible with macOS
 3 | #endif
 4 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTSCombine/SwiftTTSCombine.swift:18:28: warning: stored property '_isSpeaking' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
16 |
17 | public final class Engine: NSObject, ObservableObject {
18 |     @Published private var isSpeaking: Bool = false
   |                            `- warning: stored property '_isSpeaking' of 'Sendable'-conforming class 'Engine' is mutable; this is an error in the Swift 6 language mode
19 |     @Published private var speakingProgress: Double = 0.0
20 |     public var rateRatio: Float
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-2F0A5646E1D333AE.txt
[2/14] Compiling XCTestDynamicOverlay DefaultInitializable.swift
[3/14] Compiling XCTestDynamicOverlay XCTIsTesting.swift
[4/14] Compiling XCTestDynamicOverlay XCTCurrentTestCase.swift
[5/14] Compiling XCTestDynamicOverlay Unimplemented.swift
[6/14] Compiling XCTestDynamicOverlay GeneratePlaceholder.swift
[7/14] Compiling XCTestDynamicOverlay RuntimeWarnings.swift
[8/14] Emitting module XCTestDynamicOverlay
[9/14] Compiling XCTestDynamicOverlay XCTFail.swift
[10/14] Compiling XCTestDynamicOverlay Deprecations.swift
error: emit-module command failed with exit code 1 (use -v to see invocation)
[11/14] Emitting module SwiftTTS
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTS/SwiftTTS.swift:2:8: error: This library is not compatible with macOS
  1 | #if os(macOS)
  2 | #error("This library is not compatible with macOS")
    |        `- error: This library is not compatible with macOS
  3 | #endif
  4 |
[12/14] Compiling SwiftTTS SwiftTTS.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTS/SwiftTTS.swift:2:8: error: This library is not compatible with macOS
  1 | #if os(macOS)
  2 | #error("This library is not compatible with macOS")
    |        `- error: This library is not compatible with macOS
  3 | #endif
  4 |
error: emit-module command failed with exit code 1 (use -v to see invocation)
[13/14] Emitting module SwiftTTSCombine
/Users/admin/builder/spi-builder-workspace/Sources/SwiftTTSCombine/SwiftTTSCombine.swift:2:8: error: This library is not compatible with macOS
 1 | #if os(macOS)
 2 | #error("This library is not compatible with macOS")
   |        `- error: This library is not compatible with macOS
 3 | #endif
 4 |
BUILD FAILURE 6.1 macosSpm