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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 CZlib, reference master (a3d25e), with Swift 6.1 for macOS (SPM) on 28 Apr 2025 03:27:29 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/Octadero/CZlib.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/Octadero/CZlib
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at a3d25eb Updated License, move on Apache.
Cloned https://github.com/Octadero/CZlib.git
Revision (git rev-parse @):
a3d25eb5f85a73e39f53c979435a799391ba3e40
SUCCESS checkout https://github.com/Octadero/CZlib.git at master
========================================
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": "czlib",
      "name": "CZlib",
      "url": "https://github.com/Octadero/CZlib.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/CZlib",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/Octadero/CZlib.git
[1/15] Fetching czlib
Fetched https://github.com/Octadero/CZlib.git from cache (0.50s)
Creating working copy for https://github.com/Octadero/CZlib.git
Working copy of https://github.com/Octadero/CZlib.git resolved at master (a3d25eb)
warning: 'czlib': ignoring declared target(s) 'CZlib' in the system package
warning: '.resolve-product-dependencies': dependency 'czlib' 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/Octadero/CZlib.git
https://github.com/Octadero/CZlib.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "CZlib",
  "name" : "CZlib",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "CZlib",
      "targets" : [
        "CZlib"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "CZlib",
      "module_type" : "SystemLibraryTarget",
      "name" : "CZlib",
      "path" : ".",
      "product_memberships" : [
        "CZlib"
      ],
      "sources" : [
      ],
      "type" : "system-target"
    }
  ],
  "tools_version" : "4.0"
}
warning: 'spi-builder-workspace': ignoring declared target(s) 'CZlib' in the system package
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
warning: 'spi-builder-workspace': ignoring declared target(s) 'CZlib' in the system package
error: The package does not contain a buildable target.
Add at least one `.target` or `.executableTarget` to your `Package.swift`.
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
warning: 'spi-builder-workspace': ignoring declared target(s) 'CZlib' in the system package
error: The package does not contain a buildable target.
Add at least one `.target` or `.executableTarget` to your `Package.swift`.
BUILD FAILURE 6.1 macosSpm