Swift Package IndexBuild Information
Successful build of Int2X, reference 0.4.2 (1fb584), with Swift 6.1 for macOS (SPM) on 14 Aug 2026 21:23:22 UTC.
Swift 6 data race errors: 5
Build Command
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 InferSendableFromCapturesBuild Log
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RunAll
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Builder version: undefined version: run 'make version' to update
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/dankogai/swift-int2x.git
Reference: 0.4.2
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/dankogai/swift-int2x
* tag 0.4.2 -> FETCH_HEAD
HEAD is now at 1fb5847 revise README: playgrounds section, Swift 6 prerequisite
Cloned https://github.com/dankogai/swift-int2x.git
Revision (git rev-parse @):
1fb584751385c21af9a64f26e1356262153ff7c3
SUCCESS checkout https://github.com/dankogai/swift-int2x.git at 0.4.2
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Build
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Selected platform: macosSpm
Swift version: 6.1
Building package at path: $PWD
https://github.com/dankogai/swift-int2x.git
https://github.com/dankogai/swift-int2x.git
{
"dependencies" : [
],
"manifest_display_name" : "Int2X",
"name" : "Int2X",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
],
"products" : [
{
"name" : "Int2X",
"targets" : [
"Int2X"
],
"type" : {
"library" : [
"automatic"
]
}
},
{
"name" : "Int2XRun",
"targets" : [
"Int2XRun"
],
"type" : {
"executable" : null
}
}
],
"swift_languages_versions" : [
"5"
],
"targets" : [
{
"c99name" : "Int2XTests",
"module_type" : "SwiftTarget",
"name" : "Int2XTests",
"path" : "Tests/Int2XTests",
"sources" : [
"Int2XTests.swift",
"UInt2XTests.swift"
],
"target_dependencies" : [
"Int2X"
],
"type" : "test"
},
{
"c99name" : "Int2XRun",
"module_type" : "SwiftTarget",
"name" : "Int2XRun",
"path" : "Sources/Int2XRun",
"product_memberships" : [
"Int2XRun"
],
"sources" : [
"main.swift"
],
"target_dependencies" : [
"Int2X"
],
"type" : "executable"
},
{
"c99name" : "Int2X",
"module_type" : "SwiftTarget",
"name" : "Int2X",
"path" : "Sources/Int2X",
"product_memberships" : [
"Int2X",
"Int2XRun"
],
"sources" : [
"Int2X.swift",
"UInt2X.swift"
],
"type" : "library"
}
],
"tools_version" : "6.0"
}
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
Building for debugging...
[0/7] Write sources
[1/7] Write Int2XRun-entitlement.plist
[3/7] Write swift-version-2F0A5646E1D333AE.txt
[5/10] Compiling Int2X UInt2X.swift
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: warning: static property 'useAccelerate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| |- warning: static property 'useAccelerate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
| |- note: convert 'useAccelerate' to a 'let' constant to make 'Sendable' shared state immutable
| |- note: add '@MainActor' to make static property 'useAccelerate' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
82 | #else
83 | public static let useAccelerate = false
[6/10] Compiling Int2X Int2X.swift
[7/10] Emitting module Int2X
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: warning: static property 'useAccelerate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| |- warning: static property 'useAccelerate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
| |- note: convert 'useAccelerate' to a 'let' constant to make 'Sendable' shared state immutable
| |- note: add '@MainActor' to make static property 'useAccelerate' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
82 | #else
83 | public static let useAccelerate = false
[8/12] Compiling Int2XRun main.swift
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:7:22: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
5 | }
6 |
7 | let ua = Int2XConfig.useAccelerate ? [false, true] : [false]
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
8 |
9 | for a in ua {
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:12:21: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
10 | if 1 < ua.count {
11 | #if os(macOS)
12 | Int2XConfig.useAccelerate = a
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
13 | #endif
14 | }
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:22:21: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
20 | if 1 < ua.count {
21 | #if os(macOS)
22 | Int2XConfig.useAccelerate = a
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
23 | #endif
24 | }
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:32:21: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
30 | if 1 < ua.count {
31 | #if os(macOS)
32 | Int2XConfig.useAccelerate = a
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
33 | #endif
34 | }
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
[9/12] Emitting module Int2XRun
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:7:22: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
5 | }
6 |
7 | let ua = Int2XConfig.useAccelerate ? [false, true] : [false]
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
8 |
9 | for a in ua {
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:12:21: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
10 | if 1 < ua.count {
11 | #if os(macOS)
12 | Int2XConfig.useAccelerate = a
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
13 | #endif
14 | }
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:22:21: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
20 | if 1 < ua.count {
21 | #if os(macOS)
22 | Int2XConfig.useAccelerate = a
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
23 | #endif
24 | }
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
/Users/admin/builder/spi-builder-workspace/Sources/Int2XRun/main.swift:32:21: warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
30 | if 1 < ua.count {
31 | #if os(macOS)
32 | Int2XConfig.useAccelerate = a
| `- warning: reference to class property 'useAccelerate' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
33 | #endif
34 | }
/Users/admin/builder/spi-builder-workspace/Sources/Int2X/UInt2X.swift:81:23: note: class property declared here
79 | public class Int2XConfig {
80 | #if os(macOS)
81 | public static var useAccelerate = true
| `- note: class property declared here
82 | #else
83 | public static let useAccelerate = false
[9/12] Write Objects.LinkFileList
[10/12] Linking Int2XRun
[11/12] Applying Int2XRun
Build complete! (7.82s)
Build complete.
{
"dependencies" : [
],
"manifest_display_name" : "Int2X",
"name" : "Int2X",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
],
"products" : [
{
"name" : "Int2X",
"targets" : [
"Int2X"
],
"type" : {
"library" : [
"automatic"
]
}
},
{
"name" : "Int2XRun",
"targets" : [
"Int2XRun"
],
"type" : {
"executable" : null
}
}
],
"swift_languages_versions" : [
"5"
],
"targets" : [
{
"c99name" : "Int2XTests",
"module_type" : "SwiftTarget",
"name" : "Int2XTests",
"path" : "Tests/Int2XTests",
"sources" : [
"Int2XTests.swift",
"UInt2XTests.swift"
],
"target_dependencies" : [
"Int2X"
],
"type" : "test"
},
{
"c99name" : "Int2XRun",
"module_type" : "SwiftTarget",
"name" : "Int2XRun",
"path" : "Sources/Int2XRun",
"product_memberships" : [
"Int2XRun"
],
"sources" : [
"main.swift"
],
"target_dependencies" : [
"Int2X"
],
"type" : "executable"
},
{
"c99name" : "Int2X",
"module_type" : "SwiftTarget",
"name" : "Int2X",
"path" : "Sources/Int2X",
"product_memberships" : [
"Int2X",
"Int2XRun"
],
"sources" : [
"Int2X.swift",
"UInt2X.swift"
],
"type" : "library"
}
],
"tools_version" : "6.0"
}
Done.