Swift Package IndexBuild Information
Successful build of swift-bigint-javascriptcore, reference 0.0.1 (0636fc), with Swift 6.1 for macOS (SPM) on 16 Aug 2026 03:29:20 UTC.
Swift 6 data race errors: 2
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
========================================
RunAll
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Builder version: undefined version: run 'make version' to update
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/dankogai/swift-bigint-javascriptcore.git
Reference: 0.0.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/dankogai/swift-bigint-javascriptcore
* tag 0.0.1 -> FETCH_HEAD
HEAD is now at 0636fc9 Point the caveats at swift-bigint-gmp
Cloned https://github.com/dankogai/swift-bigint-javascriptcore.git
Revision (git rev-parse @):
0636fc94040cde324c112b99b42c8613cc77d36c
SUCCESS checkout https://github.com/dankogai/swift-bigint-javascriptcore.git at 0.0.1
========================================
Build
========================================
Selected platform: macosSpm
Swift version: 6.1
Building package at path: $PWD
https://github.com/dankogai/swift-bigint-javascriptcore.git
https://github.com/dankogai/swift-bigint-javascriptcore.git
{
"dependencies" : [
],
"manifest_display_name" : "swift-bigint-javascriptcore",
"name" : "swift-bigint-javascriptcore",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
{
"name" : "macos",
"version" : "14.0"
},
{
"name" : "ios",
"version" : "17.0"
},
{
"name" : "tvos",
"version" : "17.0"
},
{
"name" : "visionos",
"version" : "1.0"
}
],
"products" : [
{
"name" : "JSCBigInt",
"targets" : [
"JSCBigInt"
],
"type" : {
"library" : [
"automatic"
]
}
}
],
"targets" : [
{
"c99name" : "JSCBigIntTests",
"module_type" : "SwiftTarget",
"name" : "JSCBigIntTests",
"path" : "Tests/JSCBigIntTests",
"sources" : [
"JSCBigIntTests.swift"
],
"target_dependencies" : [
"JSCBigInt"
],
"type" : "test"
},
{
"c99name" : "JSCBigInt",
"module_type" : "SwiftTarget",
"name" : "JSCBigInt",
"path" : "Sources/JSCBigInt",
"product_memberships" : [
"JSCBigInt"
],
"sources" : [
"JSBigInt.swift"
],
"type" : "library"
}
],
"tools_version" : "5.9"
}
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...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/4] Compiling JSCBigInt JSBigInt.swift
/Users/admin/builder/spi-builder-workspace/Sources/JSCBigInt/JSBigInt.swift:22:20: warning: static property 'context' is not concurrency-safe because non-'Sendable' type 'JSContext' may have shared mutable state; this is an error in the Swift 6 language mode
20 | extension JSBigInt {
21 | internal enum Engine {
22 | static let context = JSContext()!
| `- warning: static property 'context' is not concurrency-safe because non-'Sendable' type 'JSContext' may have shared mutable state; this is an error in the Swift 6 language mode
23 |
24 | /// One JS function per primitive operation, compiled once.
/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk/System/Library/Frameworks/JavaScriptCore.framework/Headers/JSContext.h:43:12: note: class 'JSContext' does not conform to the 'Sendable' protocol
41 | */
42 | JS_EXPORT API_AVAILABLE(macos(10.9), ios(7.0))
43 | @interface JSContext : NSObject
| `- note: class 'JSContext' does not conform to the 'Sendable' protocol
44 |
45 | /*!
/Users/admin/builder/spi-builder-workspace/Sources/JSCBigInt/JSBigInt.swift:2:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'JavaScriptCore'
1 | #if canImport(JavaScriptCore)
2 | import JavaScriptCore
| `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'JavaScriptCore'
3 |
4 | /// An arbitrary-precision signed integer backed by JavaScriptCore's native `BigInt`.
:
20 | extension JSBigInt {
21 | internal enum Engine {
22 | static let context = JSContext()!
| |- note: add '@MainActor' to make static property 'context' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
23 |
24 | /// One JS function per primitive operation, compiled once.
/Users/admin/builder/spi-builder-workspace/Sources/JSCBigInt/JSBigInt.swift:25:20: warning: static property 'fns' is not concurrency-safe because non-'Sendable' type '[String : JSValue]' may have shared mutable state; this is an error in the Swift 6 language mode
23 |
24 | /// One JS function per primitive operation, compiled once.
25 | static let fns: [String: JSValue] = {
| |- warning: static property 'fns' is not concurrency-safe because non-'Sendable' type '[String : JSValue]' may have shared mutable state; this is an error in the Swift 6 language mode
| |- note: add '@MainActor' to make static property 'fns' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
26 | let source = """
27 | (() => {
/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk/System/Library/Frameworks/JavaScriptCore.framework/Headers/JSValue.h:48:12: note: class 'JSValue' does not conform to the 'Sendable' protocol
46 | */
47 | NS_CLASS_AVAILABLE(10_9, 7_0)
48 | @interface JSValue : NSObject
| `- note: class 'JSValue' does not conform to the 'Sendable' protocol
49 |
50 | /*!
[4/4] Emitting module JSCBigInt
/Users/admin/builder/spi-builder-workspace/Sources/JSCBigInt/JSBigInt.swift:22:20: warning: static property 'context' is not concurrency-safe because non-'Sendable' type 'JSContext' may have shared mutable state; this is an error in the Swift 6 language mode
20 | extension JSBigInt {
21 | internal enum Engine {
22 | static let context = JSContext()!
| `- warning: static property 'context' is not concurrency-safe because non-'Sendable' type 'JSContext' may have shared mutable state; this is an error in the Swift 6 language mode
23 |
24 | /// One JS function per primitive operation, compiled once.
/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk/System/Library/Frameworks/JavaScriptCore.framework/Headers/JSContext.h:43:12: note: class 'JSContext' does not conform to the 'Sendable' protocol
41 | */
42 | JS_EXPORT API_AVAILABLE(macos(10.9), ios(7.0))
43 | @interface JSContext : NSObject
| `- note: class 'JSContext' does not conform to the 'Sendable' protocol
44 |
45 | /*!
/Users/admin/builder/spi-builder-workspace/Sources/JSCBigInt/JSBigInt.swift:2:1: warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'JavaScriptCore'
1 | #if canImport(JavaScriptCore)
2 | import JavaScriptCore
| `- warning: add '@preconcurrency' to suppress 'Sendable'-related warnings from module 'JavaScriptCore'
3 |
4 | /// An arbitrary-precision signed integer backed by JavaScriptCore's native `BigInt`.
:
20 | extension JSBigInt {
21 | internal enum Engine {
22 | static let context = JSContext()!
| |- note: add '@MainActor' to make static property 'context' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
23 |
24 | /// One JS function per primitive operation, compiled once.
/Users/admin/builder/spi-builder-workspace/Sources/JSCBigInt/JSBigInt.swift:25:20: warning: static property 'fns' is not concurrency-safe because non-'Sendable' type '[String : JSValue]' may have shared mutable state; this is an error in the Swift 6 language mode
23 |
24 | /// One JS function per primitive operation, compiled once.
25 | static let fns: [String: JSValue] = {
| |- warning: static property 'fns' is not concurrency-safe because non-'Sendable' type '[String : JSValue]' may have shared mutable state; this is an error in the Swift 6 language mode
| |- note: add '@MainActor' to make static property 'fns' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
26 | let source = """
27 | (() => {
/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk/System/Library/Frameworks/JavaScriptCore.framework/Headers/JSValue.h:48:12: note: class 'JSValue' does not conform to the 'Sendable' protocol
46 | */
47 | NS_CLASS_AVAILABLE(10_9, 7_0)
48 | @interface JSValue : NSObject
| `- note: class 'JSValue' does not conform to the 'Sendable' protocol
49 |
50 | /*!
Build complete! (4.39s)
Build complete.
{
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],
"manifest_display_name" : "swift-bigint-javascriptcore",
"name" : "swift-bigint-javascriptcore",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
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},
{
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},
{
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},
{
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}
],
"products" : [
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],
"targets" : [
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"c99name" : "JSCBigIntTests",
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"name" : "JSCBigIntTests",
"path" : "Tests/JSCBigIntTests",
"sources" : [
"JSCBigIntTests.swift"
],
"target_dependencies" : [
"JSCBigInt"
],
"type" : "test"
},
{
"c99name" : "JSCBigInt",
"module_type" : "SwiftTarget",
"name" : "JSCBigInt",
"path" : "Sources/JSCBigInt",
"product_memberships" : [
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],
"sources" : [
"JSBigInt.swift"
],
"type" : "library"
}
],
"tools_version" : "5.9"
}
Done.