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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 OptionParser with Swift 6.1 for iOS using Xcode 16.3.

Build Command

Build command unavailable

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/attaswift/OptionParser.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/attaswift/OptionParser
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 88ff016 Update README.md
Cloned https://github.com/attaswift/OptionParser.git
Revision (git rev-parse @):
88ff016a4c7656eb3879c790383af713ec2bf6c9
SUCCESS checkout https://github.com/attaswift/OptionParser.git at master
========================================
Build
========================================
Selected platform:         iOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/attaswift/OptionParser.git
https://github.com/attaswift/OptionParser.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "OptionParser",
  "name" : "OptionParser",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "OptionParser",
      "targets" : [
        "OptionParser"
      ],
      "type" : {
        "library" : [
          "static"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4"
  ],
  "targets" : [
    {
      "c99name" : "OptionParserTests",
      "module_type" : "SwiftTarget",
      "name" : "OptionParserTests",
      "path" : "OptionParserTests",
      "sources" : [
        "OptionParserTests.swift"
      ],
      "target_dependencies" : [
        "OptionParser"
      ],
      "type" : "test"
    },
    {
      "c99name" : "OptionParser",
      "module_type" : "SwiftTarget",
      "name" : "OptionParser",
      "path" : "OptionParser",
      "product_memberships" : [
        "OptionParser"
      ],
      "sources" : [
        "Argument.swift",
        "Command.swift",
        "Help.swift",
        "Option.swift",
        "OptionParser.swift",
        "OptionValue.swift",
        "Parameter.swift",
        "ParseContext.swift",
        "Syntax.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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" : "OptionParser",
  "name" : "OptionParser",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "OptionParser",
      "targets" : [
        "OptionParser"
      ],
      "type" : {
        "library" : [
          "static"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4"
  ],
  "targets" : [
    {
      "c99name" : "OptionParserTests",
      "module_type" : "SwiftTarget",
      "name" : "OptionParserTests",
      "path" : "OptionParserTests",
      "sources" : [
        "OptionParserTests.swift"
      ],
      "target_dependencies" : [
        "OptionParser"
      ],
      "type" : "test"
    },
    {
      "c99name" : "OptionParser",
      "module_type" : "SwiftTarget",
      "name" : "OptionParser",
      "path" : "OptionParser",
      "product_memberships" : [
        "OptionParser"
      ],
      "sources" : [
        "Argument.swift",
        "Command.swift",
        "Help.swift",
        "Option.swift",
        "OptionParser.swift",
        "OptionValue.swift",
        "Parameter.swift",
        "ParseContext.swift",
        "Syntax.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "OptionParser",
    "schemes" : [
      "OptionParser"
    ],
    "targets" : [
      "OptionParser",
      "OptionParserTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme OptionParser -destination generic/platform=iOS 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 OptionParser -destination generic/platform=iOS "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
2025-04-26 09:14:55.484 xcodebuild[576:3281] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-26-04_09-14-0055.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:iOS }
	Available destinations for the "OptionParser" scheme:
		{ platform:macOS, arch:arm64, id:65b4ef66870be8f846f95ab2815508512d08b465, name:My Mac }
		{ platform:macOS, arch:x86_64, id:65b4ef66870be8f846f95ab2815508512d08b465, name:My Mac }
		{ platform:macOS, name:Any Mac }
INFRASTRUCTURE ERROR (status: destinationUnavailable