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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 CCairo with Swift 5.9 for visionOS using Xcode 15.2 at 1.1.1.

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.28.6
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/aestesis/CCairo.git
Reference: 1.1.1
Initialized empty Git repository in /Users/builder/builds/TDmZkXJm/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/aestesis/CCairo
 * tag               1.1.1      -> FETCH_HEAD
HEAD is now at 1bd46ac Merge pull request #1 from airalex/master
Cloned https://github.com/aestesis/CCairo.git
Revision (git rev-parse @):
1bd46ac81056766182be22fccc2cdf0e457f042f
SUCCESS checkout https://github.com/aestesis/CCairo.git at 1.1.1
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Build
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Selected platform:         visionOS
Swift version:             5.9
Building package at path:  $PWD/checkout
https://github.com/aestesis/CCairo.git
Command line invocation:
    /Applications/Xcode-15.2.0-Beta.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/builder/builds/TDmZkXJm/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
User defaults from command line:
    IDEClonedSourcePackagesDirPathOverride = /Users/builder/builds/TDmZkXJm/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.dependencies
    IDEPackageSupportUseBuiltinSCM = YES
Resolve Package Graph
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 5.9' to specify the current tools version
Resolved source packages:
  spi-builder-workspace: /Users/builder/builds/TDmZkXJm/1/finestructure/swiftpackageindex-builder/spi-builder-workspace
Resolve Package Graph
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 5.9' to specify the current tools version
2024-01-06 13:01:37.611 xcodebuild[82639:16063072] Writing error result bundle to /var/folders/4f/vmvvw7xn07sg3fzsc7v7mmx40000gp/T/ResultBundle_2024-06-01_13-01-0037.xcresult
2024-01-06 13:01:38.423 xcodebuild[82639:16063072] [MT] DVTAssertions: Warning in IDEFrameworks/IDEFoundation/Execution/RunContextManager/IDERunContextManager.m:848
Details:  Error deleting scheme: Cannot modify data because the process disallows saving.
Object:   <IDERunContextManager: 0x60000316dcb0>
Method:   -deleteRunContexts:completionQueue:completionBlock:
Thread:   <_NSMainThread: 0x60000165c200>{number = 1, name = main}
Please file a bug at https://feedbackassistant.apple.com with this warning message and any useful information you can provide.
2024-01-06 13:01:38.428 xcodebuild[82639:16063072] could not delete old scheme: Error Domain=DVTCustomDataStoringErrors Code=0 "Cannot modify data because the process disallows saving." UserInfo={NSLocalizedDescription=Cannot modify data because the process disallows saving.}
xcodebuild: error: Could not resolve package dependencies:
  package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 5.9' to specify the current tools version
GENERIC FAILURE 5.9 visionOS