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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

Successful build of swift-backtrace, reference pretty-print (c3d60f), with Swift 6.1 for macOS (SPM) on 27 Apr 2025 07:42:28 UTC.

Swift 6 data race errors: 0

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/natinusala/swift-backtrace.git
Reference: pretty-print
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/natinusala/swift-backtrace
 * branch            pretty-print -> FETCH_HEAD
 * [new branch]      pretty-print -> origin/pretty-print
HEAD is now at c3d60fe Surround the function name in red
Cloned https://github.com/natinusala/swift-backtrace.git
Revision (git rev-parse @):
c3d60fe020e980902994397d87f54c34b8937787
SUCCESS checkout https://github.com/natinusala/swift-backtrace.git at pretty-print
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "swift-backtrace",
      "name": "swift-backtrace",
      "url": "https://github.com/natinusala/swift-backtrace.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-backtrace",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/natinusala/swift-backtrace.git
[1/415] Fetching swift-backtrace
Fetched https://github.com/natinusala/swift-backtrace.git from cache (0.73s)
Creating working copy for https://github.com/natinusala/swift-backtrace.git
Working copy of https://github.com/natinusala/swift-backtrace.git resolved at pretty-print (c3d60fe)
warning: '.resolve-product-dependencies': dependency 'swift-backtrace' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/natinusala/swift-backtrace.git
https://github.com/natinusala/swift-backtrace.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "swift-backtrace",
  "name" : "swift-backtrace",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Backtrace",
      "targets" : [
        "Backtrace"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "Sample",
      "targets" : [
        "Sample"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Sample",
      "module_type" : "SwiftTarget",
      "name" : "Sample",
      "path" : "Sources/Sample",
      "product_memberships" : [
        "Sample"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
        "Backtrace"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "CBacktrace",
      "module_type" : "ClangTarget",
      "name" : "CBacktrace",
      "path" : "Sources/CBacktrace",
      "product_memberships" : [
        "Backtrace",
        "Sample"
      ],
      "sources" : [
        "atomic.c",
        "backtrace.c",
        "dwarf.c",
        "elf.c",
        "fileline.c",
        "mmap.c",
        "mmapio.c",
        "posix.c",
        "print.c",
        "simple.c",
        "sort.c",
        "state.c"
      ],
      "type" : "library"
    },
    {
      "c99name" : "BacktraceTests",
      "module_type" : "SwiftTarget",
      "name" : "BacktraceTests",
      "path" : "Tests/BacktraceTests",
      "sources" : [
        "BacktraceTests+XCTest.swift",
        "BacktraceTests.swift"
      ],
      "target_dependencies" : [
        "Backtrace"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Backtrace",
      "module_type" : "SwiftTarget",
      "name" : "Backtrace",
      "path" : "Sources/Backtrace",
      "product_memberships" : [
        "Backtrace",
        "Sample"
      ],
      "sources" : [
        "Backtrace.swift",
        "Demangle.swift"
      ],
      "target_dependencies" : [
        "CBacktrace"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/19] Write sources
[0/19] Write Sample-entitlement.plist
[2/19] Write swift-version-2F0A5646E1D333AE.txt
[3/19] Compiling CBacktrace posix.c
[4/19] Compiling CBacktrace state.c
[4/19] Compiling CBacktrace print.c
[4/19] Compiling CBacktrace elf.c
[4/19] Compiling CBacktrace fileline.c
[4/19] Compiling CBacktrace simple.c
[9/19] Compiling CBacktrace sort.c
[9/19] Compiling CBacktrace mmap.c
[9/19] Compiling CBacktrace mmapio.c
[12/19] Write sources
[13/19] Compiling CBacktrace dwarf.c
[14/19] Compiling CBacktrace backtrace.c
[14/19] Compiling CBacktrace atomic.c
[17/22] Compiling Backtrace Demangle.swift
[18/22] Compiling Backtrace Backtrace.swift
[19/22] Emitting module Backtrace
[20/24] Emitting module Sample
[21/24] Compiling Sample main.swift
[21/24] Write Objects.LinkFileList
[22/24] Linking Sample
[23/24] Applying Sample
Build complete! (2.79s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "swift-backtrace",
  "name" : "swift-backtrace",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Backtrace",
      "targets" : [
        "Backtrace"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "Sample",
      "targets" : [
        "Sample"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Sample",
      "module_type" : "SwiftTarget",
      "name" : "Sample",
      "path" : "Sources/Sample",
      "product_memberships" : [
        "Sample"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
        "Backtrace"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "CBacktrace",
      "module_type" : "ClangTarget",
      "name" : "CBacktrace",
      "path" : "Sources/CBacktrace",
      "product_memberships" : [
        "Backtrace",
        "Sample"
      ],
      "sources" : [
        "atomic.c",
        "backtrace.c",
        "dwarf.c",
        "elf.c",
        "fileline.c",
        "mmap.c",
        "mmapio.c",
        "posix.c",
        "print.c",
        "simple.c",
        "sort.c",
        "state.c"
      ],
      "type" : "library"
    },
    {
      "c99name" : "BacktraceTests",
      "module_type" : "SwiftTarget",
      "name" : "BacktraceTests",
      "path" : "Tests/BacktraceTests",
      "sources" : [
        "BacktraceTests+XCTest.swift",
        "BacktraceTests.swift"
      ],
      "target_dependencies" : [
        "Backtrace"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Backtrace",
      "module_type" : "SwiftTarget",
      "name" : "Backtrace",
      "path" : "Sources/Backtrace",
      "product_memberships" : [
        "Backtrace",
        "Sample"
      ],
      "sources" : [
        "Backtrace.swift",
        "Demangle.swift"
      ],
      "target_dependencies" : [
        "CBacktrace"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.