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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 Unxip, reference 0.5.0 (1e344e), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 13:39:07 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/thii/Unxip.git
Reference: 0.5.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/thii/Unxip
 * tag               0.5.0      -> FETCH_HEAD
HEAD is now at 1e344e3 Expose UnxipKit target
Cloned https://github.com/thii/Unxip.git
Revision (git rev-parse @):
1e344e3d7e9d3932d5aaa3cd9a077f21c7ef75e5
SUCCESS checkout https://github.com/thii/Unxip.git at 0.5.0
========================================
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": "unxip",
      "name": "Unxip",
      "url": "https://github.com/thii/Unxip.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Unxip",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/thii/Unxip.git
[1/112] Fetching unxip
Fetched https://github.com/thii/Unxip.git from cache (0.72s)
Creating working copy for https://github.com/thii/Unxip.git
Working copy of https://github.com/thii/Unxip.git resolved at 0.5.0 (1e344e3)
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/thii/Unxip.git
https://github.com/thii/Unxip.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Unxip",
  "name" : "Unxip",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "unxip",
      "targets" : [
        "Unxip"
      ],
      "type" : {
        "executable" : null
      }
    },
    {
      "name" : "UnxipKit",
      "targets" : [
        "UnxipKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "UnxipKit",
      "module_type" : "ClangTarget",
      "name" : "UnxipKit",
      "path" : "Sources/UnxipKit",
      "product_memberships" : [
        "unxip",
        "UnxipKit"
      ],
      "sources" : [
        "UnxipKit.m"
      ],
      "type" : "library"
    },
    {
      "c99name" : "Unxip",
      "module_type" : "SwiftTarget",
      "name" : "Unxip",
      "path" : "Sources/Unxip",
      "product_memberships" : [
        "unxip"
      ],
      "sources" : [
        "Runner.swift",
        "main.swift"
      ],
      "target_dependencies" : [
        "UnxipKit"
      ],
      "type" : "executable"
    }
  ],
  "tools_version" : "4.0"
}
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...
[0/7] Write sources
[0/7] Write unxip-entitlement.plist
[2/7] Compiling UnxipKit UnxipKit.m
[3/7] Write swift-version-2F0A5646E1D333AE.txt
[5/10] Compiling Unxip Runner.swift
[6/10] Emitting module Unxip
[7/10] Compiling Unxip main.swift
[7/10] Write Objects.LinkFileList
error: link command failed with exit code 1 (use -v to see invocation)
Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_PKSignedContainer", referenced from:
       in main.swift.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
[8/10] Linking unxip
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
[0/1] Planning build
Building for debugging...
[0/4] Write swift-version-2F0A5646E1D333AE.txt
[2/7] Emitting module Unxip
[3/7] Compiling Unxip Runner.swift
[4/7] Compiling Unxip main.swift
error: link command failed with exit code 1 (use -v to see invocation)
Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_PKSignedContainer", referenced from:
       in main.swift.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
[4/6] Linking unxip
BUILD FAILURE 6.1 macosSpm