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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 PerfectMustache with Swift 6.0 for macOS (SPM).

Swift 6 data race errors: 1

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun --toolchain org.swift.600202405261a swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.40.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/perfectlysoft/perfect-mustache.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/perfectlysoft/perfect-mustache
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 0d5e45e Updated for swift 5. Removed Perfect-Thread dependency
Cloned https://github.com/perfectlysoft/perfect-mustache.git
Revision (git rev-parse @):
0d5e45e95ca06c4ba7696a0cfc250e0ed35aff00
SUCCESS checkout https://github.com/perfectlysoft/perfect-mustache.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $workDir
https://github.com/perfectlysoft/perfect-mustache.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun --toolchain org.swift.600202405261a swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
Building for debugging...
[0/3] Write sources
[2/3] Write swift-version-6F35C1178C84523A.txt
[4/13] Compiling PerfectLib SysProcess.swift
[5/13] Compiling PerfectLib PerfectServer.swift
[6/13] Compiling PerfectLib JSONConvertible.swift
[7/13] Compiling PerfectLib PerfectError.swift
[8/13] Compiling PerfectLib Log.swift
[9/13] Emitting module PerfectLib
[10/13] Compiling PerfectLib Dir.swift
[11/13] Compiling PerfectLib File.swift
[12/13] Compiling PerfectLib Utilities.swift
[13/13] Compiling PerfectLib Bytes.swift
[14/15] Emitting module PerfectMustache
/Users/admin/builder/spi-builder-workspace/Sources/PerfectMustache/Mustache.swift:25:13: warning: var 'mustacheTemplateCache' is not concurrency-safe because it is non-isolated global shared mutable state; this is an error in the Swift 6 language mode
 23 | let mustacheExtension = "mustache"
 24 |
 25 | private var mustacheTemplateCache = [String: (Int, MustacheTemplate)]()
    |             |- warning: var 'mustacheTemplateCache' is not concurrency-safe because it is non-isolated global shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: convert 'mustacheTemplateCache' to a 'let' constant to make 'Sendable' shared state immutable
    |             |- note: annotate 'mustacheTemplateCache' with '@MainActor' if property should only be accessed from the main actor
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 26 | private let mustacheTemplateCacheQueue = DispatchQueue(label: "mustacheTemplateCache", attributes: .concurrent)
 27 |
[15/15] Compiling PerfectMustache Mustache.swift
/Users/admin/builder/spi-builder-workspace/Sources/PerfectMustache/Mustache.swift:25:13: warning: var 'mustacheTemplateCache' is not concurrency-safe because it is non-isolated global shared mutable state; this is an error in the Swift 6 language mode
 23 | let mustacheExtension = "mustache"
 24 |
 25 | private var mustacheTemplateCache = [String: (Int, MustacheTemplate)]()
    |             |- warning: var 'mustacheTemplateCache' is not concurrency-safe because it is non-isolated global shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: convert 'mustacheTemplateCache' to a 'let' constant to make 'Sendable' shared state immutable
    |             |- note: annotate 'mustacheTemplateCache' with '@MainActor' if property should only be accessed from the main actor
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 26 | private let mustacheTemplateCacheQueue = DispatchQueue(label: "mustacheTemplateCache", attributes: .concurrent)
 27 |
Build complete! (25.24s)
Fetching https://github.com/PerfectlySoft/PerfectLib.git
[1/10784] Fetching perfectlib
Fetched https://github.com/PerfectlySoft/PerfectLib.git from cache (2.68s)
Computing version for https://github.com/PerfectlySoft/PerfectLib.git
Computed https://github.com/PerfectlySoft/PerfectLib.git at 4.0.1 (0.66s)
Creating working copy for https://github.com/PerfectlySoft/PerfectLib.git
Working copy of https://github.com/PerfectlySoft/PerfectLib.git resolved at 4.0.1
Build complete.
{
  "dependencies" : [
    {
      "identity" : "perfectlib",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "4.0.0",
            "upper_bound" : "5.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/PerfectlySoft/PerfectLib.git"
    }
  ],
  "manifest_display_name" : "PerfectMustache",
  "name" : "PerfectMustache",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.15"
    }
  ],
  "products" : [
    {
      "name" : "PerfectMustache",
      "targets" : [
        "PerfectMustache"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PerfectMustacheTests",
      "module_type" : "SwiftTarget",
      "name" : "PerfectMustacheTests",
      "path" : "Tests/PerfectMustacheTests",
      "sources" : [
        "PerfectMustacheTests.swift"
      ],
      "target_dependencies" : [
        "PerfectMustache"
      ],
      "type" : "test"
    },
    {
      "c99name" : "PerfectMustache",
      "module_type" : "SwiftTarget",
      "name" : "PerfectMustache",
      "path" : "Sources/PerfectMustache",
      "product_dependencies" : [
        "PerfectLib"
      ],
      "product_memberships" : [
        "PerfectMustache"
      ],
      "sources" : [
        "Mustache.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Done.
This is a staging environment. For live and up-to-date package information, visit swiftpackageindex.com.