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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 SwiftLibXML, reference 3.0.0 (dc6aee), with Swift 6.1 for Linux on 26 Apr 2025 18:37:04 UTC.

Swift 6 data race errors: 0

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/rhx/SwiftLibXML.git
Reference: 3.0.0
Initialized empty Git repository in /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: 	git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: 	git branch -m <name>
From https://github.com/rhx/SwiftLibXML
 * tag               3.0.0      -> FETCH_HEAD
HEAD is now at dc6aee8 Return nil for non-existent attributes
Cloned https://github.com/rhx/SwiftLibXML.git
Revision (git rev-parse @):
dc6aee8a8344c443b3679a07fe3e7069bbba08b7
SUCCESS checkout https://github.com/rhx/SwiftLibXML.git at 3.0.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/rhx/SwiftLibXML.git
https://github.com/rhx/SwiftLibXML.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SwiftLibXML",
  "name" : "SwiftLibXML",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "SwiftLibXML",
      "targets" : [
        "SwiftLibXML"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftLibXMLTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftLibXMLTests",
      "path" : "Tests/SwiftLibXMLTests",
      "sources" : [
        "SwiftLibXMLTests.swift"
      ],
      "target_dependencies" : [
        "SwiftLibXML"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftLibXML",
      "module_type" : "SwiftTarget",
      "name" : "SwiftLibXML",
      "path" : "Sources/SwiftLibXML",
      "product_memberships" : [
        "SwiftLibXML"
      ],
      "sources" : [
        "EmptySequence.swift",
        "XMLAttribute.swift",
        "XMLDocument.swift",
        "XMLElement.swift",
        "XMLNameSpace.swift",
        "XMLPath.swift"
      ],
      "target_dependencies" : [
        "CLibXML2"
      ],
      "type" : "library"
    },
    {
      "c99name" : "CLibXML2",
      "module_type" : "SystemLibraryTarget",
      "name" : "CLibXML2",
      "path" : "Sources/CLibXML2",
      "product_memberships" : [
        "SwiftLibXML"
      ],
      "sources" : [
      ],
      "type" : "system-target"
    }
  ],
  "tools_version" : "4.2"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/9] Emitting module SwiftLibXML
[4/9] Compiling SwiftLibXML EmptySequence.swift
[5/9] Compiling SwiftLibXML XMLElement.swift
/host/spi-builder-workspace/Sources/SwiftLibXML/XMLElement.swift:34:9: warning: reference to var 'xmlFree' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
 32 |         let content: UnsafeMutablePointer<xmlChar>? = xmlNodeGetContent(node)
 33 |         let txt = content.map { String(cString: UnsafePointer<xmlChar>($0)) } ?? ""
 34 |         xmlFree(content)
    |         `- warning: reference to var 'xmlFree' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
 35 |         return txt
 36 |     }
/usr/include/libxml2/libxml/globals.h:250:23: note: var declared here
248 | XMLPUBVAR xmlMallocFunc xmlMallocAtomic;
249 | XMLPUBVAR xmlReallocFunc xmlRealloc;
250 | XMLPUBVAR xmlFreeFunc xmlFree;
    |                       `- note: var declared here
251 | XMLPUBVAR xmlStrdupFunc xmlMemStrdup;
252 | #endif /* LIBXML_THREAD_ALLOC_ENABLED */
[6/9] Compiling SwiftLibXML XMLPath.swift
[7/9] Compiling SwiftLibXML XMLNameSpace.swift
[8/9] Compiling SwiftLibXML XMLDocument.swift
/host/spi-builder-workspace/Sources/SwiftLibXML/XMLDocument.swift:66:9: warning: reference to var 'xmlFree' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
 64 |               let s = xmlNodeListGetString(xml, children, 1) else { return nil }
 65 |         let value = String(cString: UnsafePointer<xmlChar>(s))
 66 |         xmlFree(s)
    |         `- warning: reference to var 'xmlFree' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
 67 |         return value
 68 |     }
/usr/include/libxml2/libxml/globals.h:250:23: note: var declared here
248 | XMLPUBVAR xmlMallocFunc xmlMallocAtomic;
249 | XMLPUBVAR xmlReallocFunc xmlRealloc;
250 | XMLPUBVAR xmlFreeFunc xmlFree;
    |                       `- note: var declared here
251 | XMLPUBVAR xmlStrdupFunc xmlMemStrdup;
252 | #endif /* LIBXML_THREAD_ALLOC_ENABLED */
[9/9] Compiling SwiftLibXML XMLAttribute.swift
Build complete! (5.29s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SwiftLibXML",
  "name" : "SwiftLibXML",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "SwiftLibXML",
      "targets" : [
        "SwiftLibXML"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftLibXMLTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftLibXMLTests",
      "path" : "Tests/SwiftLibXMLTests",
      "sources" : [
        "SwiftLibXMLTests.swift"
      ],
      "target_dependencies" : [
        "SwiftLibXML"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftLibXML",
      "module_type" : "SwiftTarget",
      "name" : "SwiftLibXML",
      "path" : "Sources/SwiftLibXML",
      "product_memberships" : [
        "SwiftLibXML"
      ],
      "sources" : [
        "EmptySequence.swift",
        "XMLAttribute.swift",
        "XMLDocument.swift",
        "XMLElement.swift",
        "XMLNameSpace.swift",
        "XMLPath.swift"
      ],
      "target_dependencies" : [
        "CLibXML2"
      ],
      "type" : "library"
    },
    {
      "c99name" : "CLibXML2",
      "module_type" : "SystemLibraryTarget",
      "name" : "CLibXML2",
      "path" : "Sources/CLibXML2",
      "product_memberships" : [
        "SwiftLibXML"
      ],
      "sources" : [
      ],
      "type" : "system-target"
    }
  ],
  "tools_version" : "4.2"
}
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Done.