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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 WeakableSelf with Swift 6.1 for watchOS using Xcode 16.3.

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.61.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/vincent-pradeilles/weakable-self.git
Reference: 1.1.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/vincent-pradeilles/weakable-self
 * tag               1.1.1      -> FETCH_HEAD
HEAD is now at b997b6f Bump to v1.1.1
Cloned https://github.com/vincent-pradeilles/weakable-self.git
Revision (git rev-parse @):
b997b6fa5241cebf33f1bc06e75762555f36712f
SUCCESS checkout https://github.com/vincent-pradeilles/weakable-self.git at 1.1.1
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Build
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Selected platform:         watchOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/vincent-pradeilles/weakable-self.git
https://github.com/vincent-pradeilles/weakable-self.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "WeakableSelf",
  "name" : "WeakableSelf",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "WeakableSelf",
      "targets" : [
        "WeakableSelf"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "WeakableSelf",
      "module_type" : "SwiftTarget",
      "name" : "WeakableSelf",
      "path" : "Sources",
      "product_memberships" : [
        "WeakableSelf"
      ],
      "sources" : [
        "Weakable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
  "dependencies" : [
  ],
  "manifest_display_name" : "WeakableSelf",
  "name" : "WeakableSelf",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "WeakableSelf",
      "targets" : [
        "WeakableSelf"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "WeakableSelf",
      "module_type" : "SwiftTarget",
      "name" : "WeakableSelf",
      "path" : "Sources",
      "product_memberships" : [
        "WeakableSelf"
      ],
      "sources" : [
        "Weakable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "WeakableSelf",
    "schemes" : [
      "Weakable"
    ],
    "targets" : [
      "WeakableSelf",
      "WeakableSelfTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Weakable -destination generic/platform=watchOS OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme Weakable -destination generic/platform=watchOS "OTHER_SWIFT_FLAGS=-stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures"
Build settings from command line:
    OTHER_SWIFT_FLAGS = -stats-output-dir .stats -strict-concurrency=complete -enable-upcoming-feature StrictConcurrency -enable-upcoming-feature DisableOutwardActorInference -enable-upcoming-feature GlobalActorIsolatedTypesUsability -enable-upcoming-feature InferSendableFromCaptures
2025-04-24 04:35:22.717 xcodebuild[569:3227] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_04-35-0022.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:watchOS }
	Available destinations for the "Weakable" scheme:
		{ platform:macOS, arch:arm64, variant:Mac Catalyst, id:326ae05e5cc7ceb6bd0f992c0f7c6f22a59208ad, name:My Mac }
		{ platform:macOS, arch:x86_64, variant:Mac Catalyst, id:326ae05e5cc7ceb6bd0f992c0f7c6f22a59208ad, name:My Mac }
		{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:326ae05e5cc7ceb6bd0f992c0f7c6f22a59208ad, name:My Mac }
		{ platform:iOS, id:dvtdevice-DVTiPhonePlaceholder-iphoneos:placeholder, name:Any iOS Device }
		{ platform:iOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-iphonesimulator:placeholder, name:Any iOS Simulator Device }
		{ platform:macOS, variant:Mac Catalyst, name:Any Mac }
INFRASTRUCTURE ERROR (status: destinationUnavailable