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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 java_lang with Swift 5.9 for iOS using Xcode 15.2.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.2.0-Beta.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/checkout/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/checkout/.derivedData build -scheme java_lang -destination generic/platform=ios

Build Log

========================================
RunAll
========================================
Builder version: 4.28.5
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/PureSwift/java_lang.git
Reference: 2.4.0
Initialized empty Git repository in /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/PureSwift/java_lang
 * tag               2.4.0      -> FETCH_HEAD
HEAD is now at 2617a20 Swift 4.2/5
Cloned https://github.com/PureSwift/java_lang.git
Revision (git rev-parse @):
2617a2065e53fe0a1cf1151d3ccf40a435a3eeb8
SUCCESS checkout https://github.com/PureSwift/java_lang.git at 2.4.0
========================================
Build
========================================
Selected platform:         iOS
Swift version:             5.9
Building package at path:  $PWD/checkout
Command line invocation:
    /Applications/Xcode-15.2.0-Beta.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
User defaults from command line:
    IDEClonedSourcePackagesDirPathOverride = /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies
    IDEPackageSupportUseBuiltinSCM = YES
resolved source packages:
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "java_lang",
    "schemes" : [
      "java_lang"
    ],
    "targets" : [
      "java_lang"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0-Beta.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/checkout/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/checkout/.derivedData build -scheme java_lang -destination generic/platform=ios
Command line invocation:
    /Applications/Xcode-15.2.0-Beta.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.derivedData build -scheme java_lang -destination generic/platform=ios
User defaults from command line:
    IDEClonedSourcePackagesDirPathOverride = /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies
    IDEDerivedDataPathOverride = /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.derivedData
    IDEPackageSupportUseBuiltinSCM = YES
2024-01-05 02:56:07.700 xcodebuild[68118:9768948] Writing error result bundle to /var/folders/4f/vmvvw7xn07sg3fzsc7v7mmx40000gp/T/ResultBundle_2024-05-01_02-56-0007.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:ios }
	Available destinations for the "java_lang" scheme:
		{ platform:macOS, arch:arm64, id:00008103-0008793E26D2001E }
		{ platform:macOS, arch:x86_64, id:00008103-0008793E26D2001E }
		{ platform:macOS, name:Any Mac }
Command line invocation:
    /Applications/Xcode-15.2.0-Beta.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.derivedData build -scheme java_lang -destination generic/platform=ios
User defaults from command line:
    IDEClonedSourcePackagesDirPathOverride = /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies
    IDEDerivedDataPathOverride = /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.derivedData
    IDEPackageSupportUseBuiltinSCM = YES
2024-01-05 02:56:09.597 xcodebuild[68119:9768992] Writing error result bundle to /var/folders/4f/vmvvw7xn07sg3fzsc7v7mmx40000gp/T/ResultBundle_2024-05-01_02-56-0009.xcresult
xcodebuild: error: Unable to find a destination matching the provided destination specifier:
		{ generic:1, platform:ios }
	Available destinations for the "java_lang" scheme:
		{ platform:macOS, arch:arm64, id:00008103-0008793E26D2001E }
		{ platform:macOS, arch:x86_64, id:00008103-0008793E26D2001E }
		{ platform:macOS, name:Any Mac }
BUILD FAILURE 5.9 iOS