Swift Package Index

Build Information

Failed to build Prelude, reference 3.0.1 (a048b7), with Swift 6.3 for iOS using Xcode 26.4 on 21 Apr 2026 12:40:16 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Prelude -destination generic/platform=iOS

Build Log

========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/robrix/Prelude.git
Reference: 3.0.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/robrix/Prelude
 * tag               3.0.1      -> FETCH_HEAD
HEAD is now at a048b7a Merge pull request #61 from nxtstep/doc/swift-package-manager
Cloned https://github.com/robrix/Prelude.git
Revision (git rev-parse @):
a048b7af84fc25a1fd0af62e1dfe34c685cd446f
SUCCESS checkout https://github.com/robrix/Prelude.git at 3.0.1
========================================
Build
========================================
Selected platform:         iOS
Swift version:             6.3
Building package at path:  $PWD
https://github.com/robrix/Prelude.git
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Prelude",
  "name" : "Prelude",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Prelude",
      "targets" : [
        "Prelude"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "3"
  ],
  "targets" : [
    {
      "c99name" : "PreludeTests",
      "module_type" : "SwiftTarget",
      "name" : "PreludeTests",
      "path" : "PreludeTests",
      "sources" : [
        "ApplicationTests.swift",
        "ComposeTests.swift",
        "ConjunctionTests.swift",
        "CurryTests.swift",
        "FixTests.swift",
        "FlipTests.swift",
        "PreludeTests.swift",
        "TupleTests.swift"
      ],
      "target_dependencies" : [
        "Prelude"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Prelude",
      "module_type" : "SwiftTarget",
      "name" : "Prelude",
      "path" : "Prelude",
      "product_memberships" : [
        "Prelude"
      ],
      "sources" : [
        "Application.swift",
        "Compose.swift",
        "Curry.swift",
        "Fix.swift",
        "Flip.swift",
        "Optional.swift",
        "Prelude.swift",
        "Tuple.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "Prelude",
    "schemes" : [
      "Prelude",
      "Prelude-iOS",
      "Prelude-Mac",
      "PreludeTests"
    ],
    "targets" : [
      "Prelude-Mac",
      "Prelude-MacTests",
      "Prelude-iOS",
      "Prelude-iOSTests",
      "Prelude",
      "PreludeTests"
    ]
  }
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "Prelude"
    ]
  }
}
2026-04-21 08:40:10.536 xcodebuild[625:3796] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Prelude -destination generic/platform=iOS
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme Prelude -destination generic/platform=iOS
Resolve Package Graph
Resolved source packages:
  Prelude: /Users/admin/builder/spi-builder-workspace
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (2 targets)
    Target 'Prelude' in project 'Prelude'
        ➜ Explicit dependency on target 'Prelude' in project 'Prelude'
    Target 'Prelude' in project 'Prelude' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-26.4.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
Build description signature: dfbd1da8ddf97b0f7a458a802bacdc0c
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/dfbd1da8ddf97b0f7a458a802bacdc0c.xcbuilddata
error: SWIFT_VERSION '3' is unsupported, supported versions are: 4.0, 4.2, 5.0, 6.0. (in target 'Prelude' from project 'Prelude')
2026-04-21 08:40:12.007 xcodebuild[636:3917] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme Prelude
(1 failure)
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Resolved source packages:
  Prelude: /Users/admin/builder/spi-builder-workspace
resolved source packages: Prelude
2026-04-21 08:40:13.780 xcodebuild[652:4014] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Prelude",
  "name" : "Prelude",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Prelude",
      "targets" : [
        "Prelude"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "3"
  ],
  "targets" : [
    {
      "c99name" : "PreludeTests",
      "module_type" : "SwiftTarget",
      "name" : "PreludeTests",
      "path" : "PreludeTests",
      "sources" : [
        "ApplicationTests.swift",
        "ComposeTests.swift",
        "ConjunctionTests.swift",
        "CurryTests.swift",
        "FixTests.swift",
        "FlipTests.swift",
        "PreludeTests.swift",
        "TupleTests.swift"
      ],
      "target_dependencies" : [
        "Prelude"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Prelude",
      "module_type" : "SwiftTarget",
      "name" : "Prelude",
      "path" : "Prelude",
      "product_memberships" : [
        "Prelude"
      ],
      "sources" : [
        "Application.swift",
        "Compose.swift",
        "Curry.swift",
        "Fix.swift",
        "Flip.swift",
        "Optional.swift",
        "Prelude.swift",
        "Tuple.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
{
  "workspace" : {
    "name" : "spi-builder-workspace",
    "schemes" : [
      "Prelude"
    ]
  }
}
2026-04-21 08:40:14.936 xcodebuild[662:4078] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Prelude -destination generic/platform=iOS
Command line invocation:
    /Applications/Xcode-26.4.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath /Users/admin/builder/spi-builder-workspace/.derivedData build -scheme Prelude -destination generic/platform=iOS
Resolve Package Graph
Resolved source packages:
  Prelude: /Users/admin/builder/spi-builder-workspace
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (2 targets)
    Target 'Prelude' in project 'Prelude'
        ➜ Explicit dependency on target 'Prelude' in project 'Prelude'
    Target 'Prelude' in project 'Prelude' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-26.4.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.4.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-26.4.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
Build description signature: dfbd1da8ddf97b0f7a458a802bacdc0c
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/dfbd1da8ddf97b0f7a458a802bacdc0c.xcbuilddata
error: SWIFT_VERSION '3' is unsupported, supported versions are: 4.0, 4.2, 5.0, 6.0. (in target 'Prelude' from project 'Prelude')
2026-04-21 08:40:15.938 xcodebuild[665:4111] [MT] IDERunDestination: Supported platforms for the buildables in the current scheme is empty.
** BUILD FAILED **
The following build commands failed:
	Building workspace spi-builder-workspace with scheme Prelude
(1 failure)
BUILD FAILURE 6.3 iOS