Swift Package Index

Build Information

Failed to build Deferred, reference develop (c82b9e), with Swift 6.4 for macOS (Xcode) using Xcode 27.0 on 18 Sep 2026 15:37:25 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Deferred -destination platform=macOS,arch=arm64

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/bignerdranch/Deferred.git
Reference: develop
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/bignerdranch/Deferred
 * branch            develop    -> FETCH_HEAD
 * [new branch]      develop    -> origin/develop
HEAD is now at c82b9ef Add concurrency migration guide
Cloned https://github.com/bignerdranch/Deferred.git
Revision (git rev-parse @):
c82b9ef73132ac88a768b9e2fdbab7765346c61d
SUCCESS checkout https://github.com/bignerdranch/Deferred.git at develop
========================================
Build
========================================
Selected platform:         macosXcodebuild
Swift version:             6.4
Building package at path:  $PWD
https://github.com/bignerdranch/Deferred.git
Command line invocation:
    /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Deferred",
  "name" : "Deferred",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.12"
    },
    {
      "name" : "ios",
      "version" : "10.0"
    },
    {
      "name" : "watchos",
      "version" : "3.0"
    },
    {
      "name" : "tvos",
      "version" : "10.0"
    }
  ],
  "products" : [
    {
      "name" : "Deferred",
      "targets" : [
        "Deferred",
        "Task"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "TaskTests",
      "module_type" : "SwiftTarget",
      "name" : "TaskTests",
      "path" : "Tests/TaskTests",
      "sources" : [
        "AllTestsCommon.swift",
        "TaskAsyncTests.swift",
        "TaskCompositionTests.swift",
        "TaskComprehensiveTests.swift",
        "TaskProgressTests.swift",
        "TaskProtocolTests.swift",
        "TaskResultTests.swift",
        "TaskTests.swift"
      ],
      "target_dependencies" : [
        "Deferred",
        "Task"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Task",
      "module_type" : "SwiftTarget",
      "name" : "Task",
      "path" : "Sources/Task",
      "product_memberships" : [
        "Deferred"
      ],
      "sources" : [
        "Either.swift",
        "ExistentialTask.swift",
        "Progress+ExplicitComposition.swift",
        "Progress+Future.swift",
        "Task.swift",
        "TaskAndThen.swift",
        "TaskAsync.swift",
        "TaskChain.swift",
        "TaskCollections.swift",
        "TaskComposition.swift",
        "TaskEveryMap.swift",
        "TaskFallback.swift",
        "TaskIgnore.swift",
        "TaskMap.swift",
        "TaskPromise.swift",
        "TaskRecovery.swift",
        "TaskResult.swift",
        "TaskUpon.swift"
      ],
      "target_dependencies" : [
        "Deferred",
        "CAtomics"
      ],
      "type" : "library"
    },
    {
      "c99name" : "DeferredTests",
      "module_type" : "SwiftTarget",
      "name" : "DeferredTests",
      "path" : "Tests/DeferredTests",
      "sources" : [
        "AllTestsCommon.swift",
        "DeferredTests.swift",
        "ExistentialFutureTests.swift",
        "FilledDeferredTests.swift",
        "FutureAsyncTests.swift",
        "FutureCustomExecutorTests.swift",
        "FutureIgnoreTests.swift",
        "FutureTests.swift",
        "ObjectDeferredTests.swift",
        "PerformanceTests.swift",
        "ProtectedTests.swift",
        "SwiftBugTests.swift"
      ],
      "target_dependencies" : [
        "Deferred"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Deferred",
      "module_type" : "SwiftTarget",
      "name" : "Deferred",
      "path" : "Sources/Deferred",
      "product_memberships" : [
        "Deferred"
      ],
      "sources" : [
        "Atomics.swift",
        "Deferred.swift",
        "DeferredQueue.swift",
        "DeferredVariant.swift",
        "Executor.swift",
        "ExistentialFuture.swift",
        "Future.swift",
        "FutureAndThen.swift",
        "FutureAsync.swift",
        "FutureCollections.swift",
        "FutureComposition.swift",
        "FutureEveryMap.swift",
        "FutureIgnore.swift",
        "FutureMap.swift",
        "FuturePeek.swift",
        "FutureUpon.swift",
        "Locking.swift",
        "Promise.swift",
        "Protected.swift"
      ],
      "target_dependencies" : [
        "CAtomics"
      ],
      "type" : "library"
    },
    {
      "c99name" : "CAtomics",
      "module_type" : "ClangTarget",
      "name" : "CAtomics",
      "path" : "Sources/CAtomics",
      "product_memberships" : [
        "Deferred"
      ],
      "sources" : [
        "Empty.c"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
warning: 'spi-builder-workspace': Invalid Exclude '/Users/admin/builder/spi-builder-workspace/Tests/DeferredTests/Tests/AllTestsCommon.swift': File not found.
warning: 'spi-builder-workspace': Invalid Exclude '/Users/admin/builder/spi-builder-workspace/Tests/TaskTests/Tests/AllTestsCommon.swift': File not found.
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "Deferred",
    "schemes" : [
      "Deferred"
    ],
    "targets" : [
      "Deferred",
      "DeferredTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Deferred -destination platform=macOS,arch=arm64
Command line invocation:
    /Applications/Xcode-27.0.0-Release.Candidate.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 Deferred -destination platform=macOS,arch=arm64
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (1 target)
    Target 'Deferred' in project 'Deferred' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -arch arm64 -isysroot /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk -x c -c /dev/null
ExecuteExternalTool /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc --version
ExecuteExternalTool /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -version_details
Build description signature: dd24149b98947a9a7c070e39aded8764
Build description path: /Users/admin/builder/spi-builder-workspace/.derivedData/Build/Intermediates.noindex/XCBuildData/dd24149b98947a9a7c070e39aded8764.xcbuilddata
/Users/admin/builder/spi-builder-workspace/Deferred.xcodeproj: error: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 12.0 to 27.0.x. (in target 'Deferred' from project 'Deferred')
--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:macOS, arch:arm64, id:da22ccbebe05e3989491b751e807caa9eb417860, name:My Mac }
{ platform:macOS, arch:arm64, variant:Mac Catalyst, id:da22ccbebe05e3989491b751e807caa9eb417860, name:My Mac }
{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:da22ccbebe05e3989491b751e807caa9eb417860, name:My Mac }
** BUILD FAILED **
The following build commands failed:
	Building project Deferred with scheme Deferred
(1 failure)
Command line invocation:
    /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
resolved source packages:
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Deferred",
  "name" : "Deferred",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.12"
    },
    {
      "name" : "ios",
      "version" : "10.0"
    },
    {
      "name" : "watchos",
      "version" : "3.0"
    },
    {
      "name" : "tvos",
      "version" : "10.0"
    }
  ],
  "products" : [
    {
      "name" : "Deferred",
      "targets" : [
        "Deferred",
        "Task"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "TaskTests",
      "module_type" : "SwiftTarget",
      "name" : "TaskTests",
      "path" : "Tests/TaskTests",
      "sources" : [
        "AllTestsCommon.swift",
        "TaskAsyncTests.swift",
        "TaskCompositionTests.swift",
        "TaskComprehensiveTests.swift",
        "TaskProgressTests.swift",
        "TaskProtocolTests.swift",
        "TaskResultTests.swift",
        "TaskTests.swift"
      ],
      "target_dependencies" : [
        "Deferred",
        "Task"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Task",
      "module_type" : "SwiftTarget",
      "name" : "Task",
      "path" : "Sources/Task",
      "product_memberships" : [
        "Deferred"
      ],
      "sources" : [
        "Either.swift",
        "ExistentialTask.swift",
        "Progress+ExplicitComposition.swift",
        "Progress+Future.swift",
        "Task.swift",
        "TaskAndThen.swift",
        "TaskAsync.swift",
        "TaskChain.swift",
        "TaskCollections.swift",
        "TaskComposition.swift",
        "TaskEveryMap.swift",
        "TaskFallback.swift",
        "TaskIgnore.swift",
        "TaskMap.swift",
        "TaskPromise.swift",
        "TaskRecovery.swift",
        "TaskResult.swift",
        "TaskUpon.swift"
      ],
      "target_dependencies" : [
        "Deferred",
        "CAtomics"
      ],
      "type" : "library"
    },
    {
      "c99name" : "DeferredTests",
      "module_type" : "SwiftTarget",
      "name" : "DeferredTests",
      "path" : "Tests/DeferredTests",
      "sources" : [
        "AllTestsCommon.swift",
        "DeferredTests.swift",
        "ExistentialFutureTests.swift",
        "FilledDeferredTests.swift",
        "FutureAsyncTests.swift",
        "FutureCustomExecutorTests.swift",
        "FutureIgnoreTests.swift",
        "FutureTests.swift",
        "ObjectDeferredTests.swift",
        "PerformanceTests.swift",
        "ProtectedTests.swift",
        "SwiftBugTests.swift"
      ],
      "target_dependencies" : [
        "Deferred"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Deferred",
      "module_type" : "SwiftTarget",
      "name" : "Deferred",
      "path" : "Sources/Deferred",
      "product_memberships" : [
        "Deferred"
      ],
      "sources" : [
        "Atomics.swift",
        "Deferred.swift",
        "DeferredQueue.swift",
        "DeferredVariant.swift",
        "Executor.swift",
        "ExistentialFuture.swift",
        "Future.swift",
        "FutureAndThen.swift",
        "FutureAsync.swift",
        "FutureCollections.swift",
        "FutureComposition.swift",
        "FutureEveryMap.swift",
        "FutureIgnore.swift",
        "FutureMap.swift",
        "FuturePeek.swift",
        "FutureUpon.swift",
        "Locking.swift",
        "Promise.swift",
        "Protected.swift"
      ],
      "target_dependencies" : [
        "CAtomics"
      ],
      "type" : "library"
    },
    {
      "c99name" : "CAtomics",
      "module_type" : "ClangTarget",
      "name" : "CAtomics",
      "path" : "Sources/CAtomics",
      "product_memberships" : [
        "Deferred"
      ],
      "sources" : [
        "Empty.c"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
warning: 'spi-builder-workspace': Invalid Exclude '/Users/admin/builder/spi-builder-workspace/Tests/DeferredTests/Tests/AllTestsCommon.swift': File not found.
warning: 'spi-builder-workspace': Invalid Exclude '/Users/admin/builder/spi-builder-workspace/Tests/TaskTests/Tests/AllTestsCommon.swift': File not found.
{
  "project" : {
    "configurations" : [
      "Debug",
      "Release"
    ],
    "name" : "Deferred",
    "schemes" : [
      "Deferred"
    ],
    "targets" : [
      "Deferred",
      "DeferredTests"
    ]
  }
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun xcodebuild -IDEClonedSourcePackagesDirPathOverride=$PWD/.dependencies -skipMacroValidation -skipPackagePluginValidation -derivedDataPath $PWD/.derivedData build -scheme Deferred -destination platform=macOS,arch=arm64
Command line invocation:
    /Applications/Xcode-27.0.0-Release.Candidate.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 Deferred -destination platform=macOS,arch=arm64
ComputePackagePrebuildTargetDependencyGraph
Prepare packages
CreateBuildRequest
SendProjectDescription
CreateBuildOperation
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (1 target)
    Target 'Deferred' in project 'Deferred' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
/Users/admin/builder/spi-builder-workspace/Deferred.xcodeproj: error: The macOS deployment target 'MACOSX_DEPLOYMENT_TARGET' is set to 10.12, but the range of supported deployment target versions is 12.0 to 27.0.x. (in target 'Deferred' from project 'Deferred')
--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:macOS, arch:arm64, id:da22ccbebe05e3989491b751e807caa9eb417860, name:My Mac }
{ platform:macOS, arch:arm64, variant:Mac Catalyst, id:da22ccbebe05e3989491b751e807caa9eb417860, name:My Mac }
{ platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:da22ccbebe05e3989491b751e807caa9eb417860, name:My Mac }
** BUILD FAILED **
The following build commands failed:
	Building project Deferred with scheme Deferred
(1 failure)
BUILD FAILURE 6.4 macosXcodebuild