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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 XMLDocument, reference 1.0.0 (5b78bc), with Swift 6.1 for Linux on 30 Apr 2025 02:14:57 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/kewlbear/XMLDocument.git
Reference: 1.0.0
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/kewlbear/XMLDocument
 * tag               1.0.0      -> FETCH_HEAD
HEAD is now at 5b78bcc implemented basic functionality
Cloned https://github.com/kewlbear/XMLDocument.git
Revision (git rev-parse @):
5b78bcc99c3810ffdf099c00ce8fc50a20c37577
SUCCESS checkout https://github.com/kewlbear/XMLDocument.git at 1.0.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/kewlbear/XMLDocument.git
https://github.com/kewlbear/XMLDocument.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "XMLDocument",
  "name" : "XMLDocument",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "XMLDocument",
      "targets" : [
        "XMLDocument"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "libxml2XMLDocument",
      "module_type" : "SystemLibraryTarget",
      "name" : "libxml2XMLDocument",
      "path" : "Sources/libxml2",
      "product_memberships" : [
        "XMLDocument"
      ],
      "sources" : [
      ],
      "type" : "system-target"
    },
    {
      "c99name" : "XMLDocumentTests",
      "module_type" : "SwiftTarget",
      "name" : "XMLDocumentTests",
      "path" : "Tests/XMLDocumentTests",
      "sources" : [
        "XCTestManifests.swift",
        "XMLDocumentTests.swift"
      ],
      "target_dependencies" : [
        "XMLDocument"
      ],
      "type" : "test"
    },
    {
      "c99name" : "XMLDocument",
      "module_type" : "SwiftTarget",
      "name" : "XMLDocument",
      "path" : "Sources/XMLDocument",
      "product_memberships" : [
        "XMLDocument"
      ],
      "sources" : [
        "XMLDocument.swift"
      ],
      "target_dependencies" : [
        "libxml2XMLDocument"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/host -w "$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
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/4] Emitting module XMLDocument
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:39:6: error: Objective-C interoperability is disabled
 37 |     private let _docPtr: xmlDocPtr?
 38 |
 39 |     @objc
    |      `- error: Objective-C interoperability is disabled
 40 |     public init(data: Data, options: Int) throws {
 41 |         let encoding: String.Encoding = .utf8
[4/4] Compiling XMLDocument XMLDocument.swift
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:39:6: error: Objective-C interoperability is disabled
 37 |     private let _docPtr: xmlDocPtr?
 38 |
 39 |     @objc
    |      `- error: Objective-C interoperability is disabled
 40 |     public init(data: Data, options: Int) throws {
 41 |         let encoding: String.Encoding = .utf8
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:44:33: error: cannot find 'CFStringConvertEncodingToIANACharSetName' in scope
 42 |         let xml = String(data: data, encoding: encoding)
 43 |
 44 |         guard let charsetName = CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding(encoding.rawValue)) as String?,
    |                                 `- error: cannot find 'CFStringConvertEncodingToIANACharSetName' in scope
 45 |             let cur = xml?.cString(using: encoding) else {
 46 |                 throw XMLError.invalidStringEncoding
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:44:74: error: cannot find 'CFStringConvertNSStringEncodingToEncoding' in scope
 42 |         let xml = String(data: data, encoding: encoding)
 43 |
 44 |         guard let charsetName = CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding(encoding.rawValue)) as String?,
    |                                                                          `- error: cannot find 'CFStringConvertNSStringEncodingToEncoding' in scope
 45 |             let cur = xml?.cString(using: encoding) else {
 46 |                 throw XMLError.invalidStringEncoding
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:51:30: warning: initialization of 'UnsafeRawPointer' results in a dangling pointer
 49 |         let option = 0
 50 |         // FIXME: xmlParseMemory?
 51 |         _docPtr = xmlReadDoc(UnsafeRawPointer(cur).assumingMemoryBound(to: xmlChar.self), url, charsetName, CInt(option))
    |                              |                |- note: implicit argument conversion from '[CChar]' (aka 'Array<Int8>') to 'UnsafeRawPointer' produces a pointer valid only for the duration of the call to 'init(_:)'
    |                              |                `- note: use the 'withUnsafeBytes' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
    |                              `- warning: initialization of 'UnsafeRawPointer' results in a dangling pointer
 52 |
 53 |         super.init(nodePtr: nil, owner: nil)
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:234:25: 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
232 |                     let content = xmlNodeGetContent($0)
233 |                     defer {
234 |                         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
235 |                     }
236 |                     return content.flatMap { String(utf8String: UnsafeRawPointer($0).assumingMemoryBound(to: CChar.self)) }
/usr/include/libxml2/libxml/globals.h:250:23: note: var declared here
248 | XMLPUBVAR xmlMallocFunc xmlMallocAtomic;
249 | XMLPUBVAR xmlReallocFunc xmlRealloc;
250 | XMLPUBVAR xmlFreeFunc xmlFree;
    |                       `- note: var declared here
251 | XMLPUBVAR xmlStrdupFunc xmlMemStrdup;
252 | #endif /* LIBXML_THREAD_ALLOC_ENABLED */
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:246:17: warning: reference to var 'xmlFree' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
244 |                 let escaped = xmlEncodeSpecialChars(node.pointee.doc, newValue ?? "")
245 |                 xmlNodeSetContent(node, escaped)
246 |                 xmlFree(escaped)
    |                 `- warning: reference to var 'xmlFree' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
247 |             }
248 |         }
/usr/include/libxml2/libxml/globals.h:250:23: note: var declared here
248 | XMLPUBVAR xmlMallocFunc xmlMallocAtomic;
249 | XMLPUBVAR xmlReallocFunc xmlRealloc;
250 | XMLPUBVAR xmlFreeFunc xmlFree;
    |                       `- note: var declared here
251 | XMLPUBVAR xmlStrdupFunc xmlMemStrdup;
252 | #endif /* LIBXML_THREAD_ALLOC_ENABLED */
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 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
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-24593BA9C3E375BF.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/3] Emitting module XMLDocument
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:39:6: error: Objective-C interoperability is disabled
 37 |     private let _docPtr: xmlDocPtr?
 38 |
 39 |     @objc
    |      `- error: Objective-C interoperability is disabled
 40 |     public init(data: Data, options: Int) throws {
 41 |         let encoding: String.Encoding = .utf8
[3/3] Compiling XMLDocument XMLDocument.swift
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:39:6: error: Objective-C interoperability is disabled
 37 |     private let _docPtr: xmlDocPtr?
 38 |
 39 |     @objc
    |      `- error: Objective-C interoperability is disabled
 40 |     public init(data: Data, options: Int) throws {
 41 |         let encoding: String.Encoding = .utf8
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:44:33: error: cannot find 'CFStringConvertEncodingToIANACharSetName' in scope
 42 |         let xml = String(data: data, encoding: encoding)
 43 |
 44 |         guard let charsetName = CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding(encoding.rawValue)) as String?,
    |                                 `- error: cannot find 'CFStringConvertEncodingToIANACharSetName' in scope
 45 |             let cur = xml?.cString(using: encoding) else {
 46 |                 throw XMLError.invalidStringEncoding
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:44:74: error: cannot find 'CFStringConvertNSStringEncodingToEncoding' in scope
 42 |         let xml = String(data: data, encoding: encoding)
 43 |
 44 |         guard let charsetName = CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding(encoding.rawValue)) as String?,
    |                                                                          `- error: cannot find 'CFStringConvertNSStringEncodingToEncoding' in scope
 45 |             let cur = xml?.cString(using: encoding) else {
 46 |                 throw XMLError.invalidStringEncoding
/host/spi-builder-workspace/Sources/XMLDocument/XMLDocument.swift:51:30: warning: initialization of 'UnsafeRawPointer' results in a dangling pointer
 49 |         let option = 0
 50 |         // FIXME: xmlParseMemory?
 51 |         _docPtr = xmlReadDoc(UnsafeRawPointer(cur).assumingMemoryBound(to: xmlChar.self), url, charsetName, CInt(option))
    |                              |                |- note: implicit argument conversion from '[CChar]' (aka 'Array<Int8>') to 'UnsafeRawPointer' produces a pointer valid only for the duration of the call to 'init(_:)'
    |                              |                `- note: use the 'withUnsafeBytes' method on Array in order to explicitly convert argument to buffer pointer valid for a defined scope
    |                              `- warning: initialization of 'UnsafeRawPointer' results in a dangling pointer
 52 |
 53 |         super.init(nodePtr: nil, owner: nil)
BUILD FAILURE 6.1 linux