Swift Package Index

Build Information

Failed to build swift-numerics-differentiable, reference main (5b28de), with Swift 6.1 for iOS using Xcode 16.3 on 20 Apr 2026 03:06:16 UTC.

Build Command

No build command. This typically means the build failed at an early stage where we determine the build command.

Build Log

========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/differentiable-swift/swift-numerics-differentiable.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/differentiable-swift/swift-numerics-differentiable
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 5b28de8 fix: only add direct simd overloads when using Swift 6.3 or above.
Cloned https://github.com/differentiable-swift/swift-numerics-differentiable.git
Revision (git rev-parse @):
5b28de80236c7e8e1313c0bf2c4096d1b0f4a161
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/differentiable-swift/swift-numerics-differentiable.git at main
========================================
Build
========================================
Selected platform:         iOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/differentiable-swift/swift-numerics-differentiable.git
https://github.com/differentiable-swift/swift-numerics-differentiable.git
{
  "dependencies" : [
    {
      "identity" : "swift-numerics",
      "requirement" : {
        "range" : [
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            "lower_bound" : "1.1.0",
            "upper_bound" : "2.0.0"
          }
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      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-numerics"
    },
    {
      "identity" : "swift-differentiation",
      "requirement" : {
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            "upper_bound" : "3.0.0"
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      "type" : "sourceControl",
      "url" : "https://github.com/differentiable-swift/swift-differentiation.git"
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  "manifest_display_name" : "swift-numerics-differentiable",
  "name" : "swift-numerics-differentiable",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
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      "name" : "macos",
      "version" : "26.0"
    },
    {
      "name" : "ios",
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    }
  ],
  "products" : [
    {
      "name" : "NumericsDifferentiable",
      "targets" : [
        "NumericsDifferentiable"
      ],
      "type" : {
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        ]
      }
    },
    {
      "name" : "RealModuleDifferentiable",
      "targets" : [
        "RealModuleDifferentiable"
      ],
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        "library" : [
          "automatic"
        ]
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    },
    {
      "name" : "ComplexModuleDifferentiable",
      "targets" : [
        "ComplexModuleDifferentiable"
      ],
      "type" : {
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    },
    {
      "name" : "CodeGeneratorExecutable",
      "targets" : [
        "CodeGeneratorExecutable"
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      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RealModuleDifferentiableTests",
      "module_type" : "SwiftTarget",
      "name" : "RealModuleDifferentiableTests",
      "path" : "Tests/RealModuleDifferentiableTests",
      "sources" : [
        "RealModuleDifferentiableTests.swift"
      ],
      "target_dependencies" : [
        "RealModuleDifferentiable"
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      "type" : "test"
    },
    {
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      "module_type" : "SwiftTarget",
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      "product_memberships" : [
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        "RealModuleDifferentiable"
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      "sources" : [
        "FloatingPoint+ConcreteImplementations.swift",
        "RealModule.swift",
        "SIMD+ElementaryFunctions.swift"
      ],
      "target_dependencies" : [
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      "type" : "library"
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      "module_type" : "SwiftTarget",
      "name" : "NumericsDifferentiable",
      "path" : "Sources/NumericsDifferentiable",
      "product_dependencies" : [
        "Numerics"
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      "product_memberships" : [
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      "sources" : [
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      "target_dependencies" : [
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      "product_memberships" : [
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      "sources" : [
        "Complex+Differentiable.swift",
        "ComplexModule.swift",
        "ElementaryFunctions+Differentiable.swift"
      ],
      "type" : "library"
    },
    {
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      "module_type" : "PluginTarget",
      "name" : "CodeGeneratorPlugin",
      "path" : "Plugins",
      "plugin_capability" : {
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      "sources" : [
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        "RealFunctionsGenerator.swift",
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}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Fetching from https://github.com/apple/swift-numerics (cached)
Fetching from https://github.com/differentiable-swift/swift-differentiation.git
Fetching from https://github.com/differentiable-swift/swift-differentiation-stdlib.git
Resolve Package Graph
Updating from https://github.com/apple/swift-numerics
Updating from https://github.com/differentiable-swift/swift-differentiation.git
Updating from https://github.com/differentiable-swift/swift-differentiation-stdlib.git
Resolve Package Graph
Updating from https://github.com/apple/swift-numerics
Updating from https://github.com/differentiable-swift/swift-differentiation.git
Updating from https://github.com/differentiable-swift/swift-differentiation-stdlib.git
Resolve Package Graph
Updating from https://github.com/differentiable-swift/swift-differentiation.git
Updating from https://github.com/apple/swift-numerics
Updating from https://github.com/differentiable-swift/swift-differentiation-stdlib.git
Resolved source packages:
  spi-builder-workspace: (null)
2026-04-19 20:06:14.720 xcodebuild[516:2932] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2026-19-04_20-06-0014.xcresult
xcodebuild: error: Could not resolve package dependencies:
  Failed to resolve dependencies Dependencies could not be resolved because 'swift-differentiation-stdlib' contains incompatible tools version (6.2.0) and root depends on 'swift-differentiation' 2.0.0..<3.0.0.
'swift-differentiation' >= 2.0.0 practically depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0 because 'swift-differentiation' 2.0.0 depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0 and 'swift-differentiation' 2.0.1 depends on 'swift-differentiation-stdlib' 602.0.1..<603.0.0.
'swift-differentiation' {2.0.0, 2.0.2..<3.0.0} practically depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0 because no versions of 'swift-differentiation' match the requirement 2.0.2..<3.0.0 and 'swift-differentiation' 2.0.0 depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0.
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Updating from https://github.com/differentiable-swift/swift-differentiation.git
Updating from https://github.com/apple/swift-numerics
Updating from https://github.com/differentiable-swift/swift-differentiation-stdlib.git
Resolved source packages:
  spi-builder-workspace: (null)
2026-04-19 20:06:16.733 xcodebuild[811:4311] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2026-19-04_20-06-0016.xcresult
xcodebuild: error: Could not resolve package dependencies:
  Failed to resolve dependencies Dependencies could not be resolved because 'swift-differentiation-stdlib' contains incompatible tools version (6.2.0) and root depends on 'swift-differentiation' 2.0.0..<3.0.0.
'swift-differentiation' >= 2.0.0 practically depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0 because 'swift-differentiation' 2.0.0 depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0 and 'swift-differentiation' 2.0.1 depends on 'swift-differentiation-stdlib' 602.0.1..<603.0.0.
'swift-differentiation' {2.0.0, 2.0.2..<3.0.0} practically depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0 because no versions of 'swift-differentiation' match the requirement 2.0.2..<3.0.0 and 'swift-differentiation' 2.0.0 depends on 'swift-differentiation-stdlib' 602.0.0..<603.0.0.
BUILD FAILURE 6.1 iOS