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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 PrettyStackTrace, reference master (e9ec08), with Swift 6.1 for macOS (Xcode) using Xcode 16.3 on 24 Apr 2025 14:13:25 UTC.

Build Command

No build command. This typically means the build failed at an early stage where we determine the build command.

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/llvm-swift/prettystacktrace.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/llvm-swift/prettystacktrace
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at e9ec08d Drop in-tree copy of filecheck executable
Cloned https://github.com/llvm-swift/prettystacktrace.git
Revision (git rev-parse @):
e9ec08dca3648eec07441571e183949cfded23b8
SUCCESS checkout https://github.com/llvm-swift/prettystacktrace.git at master
========================================
Build
========================================
Selected platform:         macosXcodebuild
Swift version:             6.1
Building package at path:  $PWD
https://github.com/llvm-swift/prettystacktrace.git
https://github.com/llvm-swift/prettystacktrace.git
{
  "dependencies" : [
    {
      "identity" : "swift-package-manager",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.1.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-package-manager.git"
    },
    {
      "identity" : "symbolic",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.0.1",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/llvm-swift/Symbolic.git"
    },
    {
      "identity" : "filecheck",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.2.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/llvm-swift/FileCheck.git"
    },
    {
      "identity" : "lite",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.0.3",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/llvm-swift/Lite.git"
    }
  ],
  "manifest_display_name" : "PrettyStackTrace",
  "name" : "PrettyStackTrace",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "PrettyStackTrace",
      "targets" : [
        "PrettyStackTrace"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "pst-lite",
      "targets" : [
        "pst-lite"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "pst_lite",
      "module_type" : "SwiftTarget",
      "name" : "pst-lite",
      "path" : "Sources/pst-lite",
      "product_dependencies" : [
        "LiteSupport",
        "SPMUtility",
        "Symbolic",
        "filecheck"
      ],
      "product_memberships" : [
        "pst-lite"
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      "sources" : [
        "main.swift"
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      "type" : "executable"
    },
    {
      "c99name" : "PrettyStackTrace",
      "module_type" : "SwiftTarget",
      "name" : "PrettyStackTrace",
      "path" : "Sources/PrettyStackTrace",
      "product_memberships" : [
        "PrettyStackTrace"
      ],
      "sources" : [
        "PrettyStackTrace.swift"
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      "type" : "library"
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  "tools_version" : "5.0"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Fetching from https://github.com/llvm-swift/FileCheck.git
Fetching from https://github.com/llvm-swift/Lite.git
Fetching from https://github.com/apple/swift-package-manager.git
Fetching from https://github.com/llvm-swift/Symbolic.git
Fetching from https://github.com/mxcl/Chalk.git
Fetching from https://github.com/apple/swift-argument-parser (cached)
Fetching from https://github.com/apple/swift-llbuild.git
Fetching from https://github.com/apple/swift-tools-support-core.git (cached)
Fetching from https://github.com/onevcat/Rainbow.git
Creating working copy of package ‘Lite’
Checking out 0.2.0 of package ‘Lite’
Creating working copy of package ‘swift-argument-parser’
Checking out 1.5.0 of package ‘swift-argument-parser’
Creating working copy of package ‘Chalk’
Checking out 0.5.0 of package ‘Chalk’
Creating working copy of package ‘Rainbow’
Checking out 3.2.0 of package ‘Rainbow’
Creating working copy of package ‘swift-tools-support-core’
Checking out 0.1.0 of package ‘swift-tools-support-core’
Creating working copy of package ‘swift-package-manager’
Checking out 0.6.0 of package ‘swift-package-manager’
Creating working copy of package ‘FileCheck’
Checking out 0.2.6 of package ‘FileCheck’
Creating working copy of package ‘Symbolic’
Checking out 0.0.2 of package ‘Symbolic’
Creating working copy of package ‘swift-llbuild’
Checking out 0.3.0 of package ‘swift-llbuild’
ignoring broken symlink /Users/admin/builder/spi-builder-workspace/.dependencies/checkouts/swift-llbuild/lib/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvmproduct 'SPMUtility' required by package 'spi-builder-workspace' target 'pst-lite' not found. Did you mean 'TSCUtility'?Resolve Package Graph
ignoring broken symlink /Users/admin/builder/spi-builder-workspace/.dependencies/checkouts/swift-llbuild/lib/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvmproduct 'SPMUtility' required by package 'spi-builder-workspace' target 'pst-lite' not found. Did you mean 'TSCUtility'?
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 07:13:23.506 xcodebuild[516:2867] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_07-13-0023.xcresult
xcodebuild: error: Could not resolve package dependencies:
  product 'SPMUtility' required by package 'spi-builder-workspace' target 'pst-lite' not found. Did you mean 'TSCUtility'?
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
ignoring broken symlink /Users/admin/builder/spi-builder-workspace/.dependencies/checkouts/swift-llbuild/lib/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvm/Demangle/include/llvmproduct 'SPMUtility' required by package 'spi-builder-workspace' target 'pst-lite' not found. Did you mean 'TSCUtility'?
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 07:13:25.007 xcodebuild[980:4878] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_07-13-0025.xcresult
xcodebuild: error: Could not resolve package dependencies:
  product 'SPMUtility' required by package 'spi-builder-workspace' target 'pst-lite' not found. Did you mean 'TSCUtility'?
BUILD FAILURE 6.1 macosXcodebuild