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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 Rainbow, reference 4.1.0 (0c627a), with Swift 6.1 for Linux on 30 Apr 2025 07:28:27 UTC.

Swift 6 data race errors: 5

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/onevcat/Rainbow.git
Reference: 4.1.0
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/onevcat/Rainbow
 * tag               4.1.0      -> FETCH_HEAD
HEAD is now at 0c627a4 Upgrade project settings
Cloned https://github.com/onevcat/Rainbow.git
Revision (git rev-parse @):
0c627a4f8a39ef37eadec1ceec02e4a7f55561ac
SUCCESS checkout https://github.com/onevcat/Rainbow.git at 4.1.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/onevcat/Rainbow.git
https://github.com/onevcat/Rainbow.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Rainbow",
  "name" : "Rainbow",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Rainbow",
      "targets" : [
        "Rainbow"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "RainbowPlayground",
      "targets" : [
        "RainbowPlayground"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RainbowTests",
      "module_type" : "SwiftTarget",
      "name" : "RainbowTests",
      "path" : "Tests",
      "sources" : [
        "RainbowTests/ColorApproximatedTests.swift",
        "RainbowTests/ColorTests.swift",
        "RainbowTests/ConsoleStringTests.swift",
        "RainbowTests/ConsoleTextParserTests.swift",
        "RainbowTests/RainbowTests.swift"
      ],
      "target_dependencies" : [
        "Rainbow"
      ],
      "type" : "test"
    },
    {
      "c99name" : "RainbowPlayground",
      "module_type" : "SwiftTarget",
      "name" : "RainbowPlayground",
      "path" : "Playground",
      "product_memberships" : [
        "RainbowPlayground"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
        "Rainbow"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "Rainbow",
      "module_type" : "SwiftTarget",
      "name" : "Rainbow",
      "path" : "Sources",
      "product_memberships" : [
        "Rainbow",
        "RainbowPlayground"
      ],
      "sources" : [
        "BackgroundColor.swift",
        "CodesParser.swift",
        "Color.swift",
        "ColorApproximation.swift",
        "ControlCode.swift",
        "ModesExtractor.swift",
        "OutputTarget.swift",
        "Rainbow.swift",
        "String+Rainbow.swift",
        "StringGenerator.swift",
        "Style.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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...
[0/7] Write sources
[2/7] Write swift-version-24593BA9C3E375BF.txt
[4/18] Compiling Rainbow ControlCode.swift
[5/18] Compiling Rainbow ModesExtractor.swift
[6/19] Compiling Rainbow String+Rainbow.swift
[7/19] Compiling Rainbow StringGenerator.swift
[8/19] Compiling Rainbow Style.swift
[9/19] Compiling Rainbow Rainbow.swift
/host/spi-builder-workspace/Sources/Rainbow.swift:98:23: warning: static property 'outputTarget' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 96 |     /// Output target for `Rainbow`. `Rainbow` should detect correct target itself, so you rarely need to set it.
 97 |     /// However, if you want the colorized string to be different, or the detection is not correct, you can set it manually.
 98 |     public static var outputTarget = OutputTarget.current
    |                       |- warning: static property 'outputTarget' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'outputTarget' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'outputTarget' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 99 |
100 |     static var environment = ProcessInfo.processInfo.environment
/host/spi-builder-workspace/Sources/Rainbow.swift:100:16: warning: static property 'environment' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 98 |     public static var outputTarget = OutputTarget.current
 99 |
100 |     static var environment = ProcessInfo.processInfo.environment
    |                |- warning: static property 'environment' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                |- note: convert 'environment' to a 'let' constant to make 'Sendable' shared state immutable
    |                |- note: add '@MainActor' to make static property 'environment' part of global actor 'MainActor'
    |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
101 |     static func hasValidValueInEnvironment(_ key: String) -> Bool {
102 |         guard !key.isEmpty, let value = environment[key] else {
/host/spi-builder-workspace/Sources/Rainbow.swift:121:23: warning: static property 'enabled' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
119 |     /// set and `FORCE_COLOR` not set to a valid value ("0" or empty value is treated as "unset". `FORCE_COLOR` has
120 |     /// higher priority than `NO_COLOR` if set).
121 |     public static var enabled = environmentAvailable
    |                       |- warning: static property 'enabled' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'enabled' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'enabled' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
122 |
123 |     public static func extractEntry(for string: String) -> Entry {
[10/19] Emitting module Rainbow
/host/spi-builder-workspace/Sources/OutputTarget.swift:46:16: warning: static property 'current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
44 |
45 |     /// Detected output target by current environment.
46 |     static var current: OutputTarget = {
   |                |- warning: static property 'current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: convert 'current' to a 'let' constant to make 'Sendable' shared state immutable
   |                |- note: add '@MainActor' to make static property 'current' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
47 |         // Check if we are in any term env and the output is a tty.
48 |         let termType = getEnvValue("TERM")
/host/spi-builder-workspace/Sources/OutputTarget.swift:49:72: warning: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
47 |         // Check if we are in any term env and the output is a tty.
48 |         let termType = getEnvValue("TERM")
49 |         if let t = termType, t.lowercased() != "dumb" && isatty(fileno(stdout)) != 0 {
   |                                                                        `- warning: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
50 |             return .console
51 |         }
/usr/include/stdio.h:144:14: note: var declared here
142 | /* Standard streams.  */
143 | extern FILE *stdin;		/* Standard input stream.  */
144 | extern FILE *stdout;		/* Standard output stream.  */
    |              `- note: var declared here
145 | extern FILE *stderr;		/* Standard error output stream.  */
146 | /* C89/C99 say they're macros.  Make them happy.  */
/host/spi-builder-workspace/Sources/Rainbow.swift:98:23: warning: static property 'outputTarget' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 96 |     /// Output target for `Rainbow`. `Rainbow` should detect correct target itself, so you rarely need to set it.
 97 |     /// However, if you want the colorized string to be different, or the detection is not correct, you can set it manually.
 98 |     public static var outputTarget = OutputTarget.current
    |                       |- warning: static property 'outputTarget' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'outputTarget' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'outputTarget' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 99 |
100 |     static var environment = ProcessInfo.processInfo.environment
/host/spi-builder-workspace/Sources/Rainbow.swift:100:16: warning: static property 'environment' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 98 |     public static var outputTarget = OutputTarget.current
 99 |
100 |     static var environment = ProcessInfo.processInfo.environment
    |                |- warning: static property 'environment' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                |- note: convert 'environment' to a 'let' constant to make 'Sendable' shared state immutable
    |                |- note: add '@MainActor' to make static property 'environment' part of global actor 'MainActor'
    |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
101 |     static func hasValidValueInEnvironment(_ key: String) -> Bool {
102 |         guard !key.isEmpty, let value = environment[key] else {
/host/spi-builder-workspace/Sources/Rainbow.swift:121:23: warning: static property 'enabled' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
119 |     /// set and `FORCE_COLOR` not set to a valid value ("0" or empty value is treated as "unset". `FORCE_COLOR` has
120 |     /// higher priority than `NO_COLOR` if set).
121 |     public static var enabled = environmentAvailable
    |                       |- warning: static property 'enabled' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'enabled' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'enabled' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
122 |
123 |     public static func extractEntry(for string: String) -> Entry {
[11/19] Compiling Rainbow BackgroundColor.swift
[12/19] Compiling Rainbow CodesParser.swift
[13/19] Compiling Rainbow Color.swift
[14/19] Compiling Rainbow ColorApproximation.swift
[15/19] Compiling Rainbow OutputTarget.swift
/host/spi-builder-workspace/Sources/OutputTarget.swift:46:16: warning: static property 'current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
44 |
45 |     /// Detected output target by current environment.
46 |     static var current: OutputTarget = {
   |                |- warning: static property 'current' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |                |- note: convert 'current' to a 'let' constant to make 'Sendable' shared state immutable
   |                |- note: add '@MainActor' to make static property 'current' part of global actor 'MainActor'
   |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
47 |         // Check if we are in any term env and the output is a tty.
48 |         let termType = getEnvValue("TERM")
/host/spi-builder-workspace/Sources/OutputTarget.swift:49:72: warning: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
47 |         // Check if we are in any term env and the output is a tty.
48 |         let termType = getEnvValue("TERM")
49 |         if let t = termType, t.lowercased() != "dumb" && isatty(fileno(stdout)) != 0 {
   |                                                                        `- warning: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
50 |             return .console
51 |         }
/usr/include/stdio.h:144:14: note: var declared here
142 | /* Standard streams.  */
143 | extern FILE *stdin;		/* Standard input stream.  */
144 | extern FILE *stdout;		/* Standard output stream.  */
    |              `- note: var declared here
145 | extern FILE *stderr;		/* Standard error output stream.  */
146 | /* C89/C99 say they're macros.  Make them happy.  */
[16/20] Wrapping AST for Rainbow for debugging
[18/22] Emitting module RainbowPlayground
[19/22] Compiling RainbowPlayground main.swift
[20/23] Wrapping AST for RainbowPlayground for debugging
[21/23] Write Objects.LinkFileList
[22/23] Linking RainbowPlayground
Build complete! (8.04s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Rainbow",
  "name" : "Rainbow",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Rainbow",
      "targets" : [
        "Rainbow"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "RainbowPlayground",
      "targets" : [
        "RainbowPlayground"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RainbowTests",
      "module_type" : "SwiftTarget",
      "name" : "RainbowTests",
      "path" : "Tests",
      "sources" : [
        "RainbowTests/ColorApproximatedTests.swift",
        "RainbowTests/ColorTests.swift",
        "RainbowTests/ConsoleStringTests.swift",
        "RainbowTests/ConsoleTextParserTests.swift",
        "RainbowTests/RainbowTests.swift"
      ],
      "target_dependencies" : [
        "Rainbow"
      ],
      "type" : "test"
    },
    {
      "c99name" : "RainbowPlayground",
      "module_type" : "SwiftTarget",
      "name" : "RainbowPlayground",
      "path" : "Playground",
      "product_memberships" : [
        "RainbowPlayground"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
        "Rainbow"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "Rainbow",
      "module_type" : "SwiftTarget",
      "name" : "Rainbow",
      "path" : "Sources",
      "product_memberships" : [
        "Rainbow",
        "RainbowPlayground"
      ],
      "sources" : [
        "BackgroundColor.swift",
        "CodesParser.swift",
        "Color.swift",
        "ColorApproximation.swift",
        "ControlCode.swift",
        "ModesExtractor.swift",
        "OutputTarget.swift",
        "Rainbow.swift",
        "String+Rainbow.swift",
        "StringGenerator.swift",
        "Style.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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.