Swift Package Index

Build Information

Failed to build swift-rfc-791, reference 0.3.0 (a5d723), with Swift 6.4 for macOS (SPM) on 25 Sep 2026 00:23:37 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
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Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/swift-ietf/swift-rfc-791.git
Reference: 0.3.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/swift-ietf/swift-rfc-791
 * tag               0.3.0      -> FETCH_HEAD
HEAD is now at a5d7238 Refactor IPv4 Address.Class to follow Pattern Requirements
Cloned https://github.com/swift-ietf/swift-rfc-791.git
Revision (git rev-parse @):
a5d7238b80d88ed434d45f7e1e34af449d562a47
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/swift-ietf/swift-rfc-791.git at 0.3.0
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/swift-ietf/swift-rfc-791.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64
Building for debugging...
[Computing dependencies]
[Constructing description]
[Pre-planning 1 / 708]
[Planning deferred tasks]
[147 / 327]
[154 / 332] _NumericsShims
[167 / 372] StandardsCollections
[171 / 383] RealModule
[172 / 383] Positioning
[186 / 383] RealModule
[200 / 383] StandardsCollections
[212 / 383] TernaryLogic
[218 / 383] RealModule
[226 / 383] RealModule-product
[237 / 383] Parsing
[240 / 383] Positioning
[247 / 386] Parsing
[259 / 399] Locale
[286 / 401] Predicate
[302 / 417] Dimension
[311 / 417]
[312 / 417] Dimension
[331 / 441] StandardTime
[335 / 441] StandardTime
[342 / 441] Algebra
[359 / 445] Region
[368 / 472] Region
[378 / 472] Region
[387 / 472] Region
Fetching https://github.com/swift-standards/swift-standards
Fetching https://github.com/swift-standards/swift-incits-4-1986
[1/1245] Fetching swift-incits-4-1986
[26/6118] Fetching swift-incits-4-1986, swift-standards
Fetched https://github.com/swift-standards/swift-standards (1.36s)
Fetched https://github.com/swift-standards/swift-incits-4-1986 (1.36s)
Computing version for https://github.com/swift-standards/swift-incits-4-1986
Computed https://github.com/swift-standards/swift-incits-4-1986 at 0.7.1 (1.94s)
Computing version for https://github.com/swift-standards/swift-standards
Computed https://github.com/swift-standards/swift-standards at 0.30.1 (0.63s)
Fetching https://github.com/swiftlang/swift-syntax
Fetching https://github.com/apple/swift-numerics
Fetching https://github.com/coenttb/swift-testing-performance
[1/402] Fetching swift-testing-performance
[403/7042] Fetching swift-testing-performance, swift-numerics
Fetched https://github.com/apple/swift-numerics (1.86s)
[1/80067] Fetching swift-syntax
Fetched https://github.com/swiftlang/swift-syntax (5.80s)
Fetched https://github.com/coenttb/swift-testing-performance (5.80s)
Computing version for https://github.com/coenttb/swift-testing-performance
Computed https://github.com/coenttb/swift-testing-performance at 0.3.1 (6.38s)
Fetching https://github.com/coenttb/swift-memory-allocation
[1/424] Fetching swift-memory-allocation
Fetched https://github.com/coenttb/swift-memory-allocation (1.05s)
Computing version for https://github.com/coenttb/swift-memory-allocation
Computed https://github.com/coenttb/swift-memory-allocation at 0.2.0 (1.62s)
Computing version for https://github.com/swiftlang/swift-syntax
Computed https://github.com/swiftlang/swift-syntax at 602.0.0 (2.61s)
Computing version for https://github.com/apple/swift-numerics
Computed https://github.com/apple/swift-numerics at 1.1.1 (0.53s)
Creating working copy for https://github.com/swiftlang/swift-syntax
Working copy of https://github.com/swiftlang/swift-syntax resolved at 602.0.0
Creating working copy for https://github.com/coenttb/swift-testing-performance
Working copy of https://github.com/coenttb/swift-testing-performance resolved at 0.3.1
Creating working copy for https://github.com/swift-standards/swift-incits-4-1986
Working copy of https://github.com/swift-standards/swift-incits-4-1986 resolved at 0.7.1
Creating working copy for https://github.com/coenttb/swift-memory-allocation
Working copy of https://github.com/coenttb/swift-memory-allocation resolved at 0.2.0
Creating working copy for https://github.com/swift-standards/swift-standards
Working copy of https://github.com/swift-standards/swift-standards resolved at 0.30.1
Creating working copy for https://github.com/apple/swift-numerics
Working copy of https://github.com/apple/swift-numerics resolved at 1.1.1
Downloading package prebuilt https://download.swift.org/prebuilts/swift-syntax/602.0.0/swiftlang-6.4.0.34.1-macosx27.0-MacroSupport.zip
Downloaded https://download.swift.org/prebuilts/swift-syntax/602.0.0/swiftlang-6.4.0.34.1-macosx27.0-MacroSupport.zip (1.31s)
error: SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/FixedWidthInteger+Binary.swift failed with a nonzero exit code. Command line:     cd /Users/admin/builder
    builtin-SwiftPerFileCompile FixedWidthInteger+Binary.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/FixedWidthInteger+Binary.swift:235:27: error: ambiguous use of 'withUnsafeBytes'
233 |         guard bytes.count == MemoryLayout<Self>.size else { return nil }
234 |
235 |         let value = bytes.withUnsafeBytes { $0.load(as: Self.self) }
    |                           `- error: ambiguous use of 'withUnsafeBytes'
236 |
237 |         switch endianness {
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Array+Binary.Contiguous.swift:11:17: note: found this candidate 
 9 |
10 |     @inlinable
11 |     public func withUnsafeBytes<R, E: Swift.Error>(
   |                 `- note: found this candidate 
12 |         _ body: (UnsafeRawBufferPointer) throws(E) -> R
13 |     ) throws(E) -> R {
Swift.Array.withUnsafeBytes:2:24: note: found this candidate in module 'Swift'
1 | generic struct Array {
2 | @inlinable public func withUnsafeBytes<R>(_ body: (UnsafeRawBufferPointer) throws -> R) rethrows -> R}
  |                        `- note: found this candidate in module 'Swift'
3 |
Failed frontend command:
/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Array+Binary.Contiguous.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Array+Bytes.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Aligned.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Alignment.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Collection.Array.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Collection.Set.Algebra.Symmetric.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Collection.Set.Algebra.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Collection.Set.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Collection.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Contiguous+Subscript.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Contiguous.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Copy.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Count.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Cursor.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Endianness.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Error.Bit.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Error.Bounds.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Error.Invariant.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Error.Negative.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Error.Overflow.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Error.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Format.Bytes.Notation.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Format.Bytes.Unit.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Format.Bytes.Units.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Format.Bytes.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Format.Radix.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Format.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Mask.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Mutable+RangeAccess.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Mutable.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Pattern.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Position.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Reader.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Serializable.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Shift.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Space.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.Zero.swift -primary-file /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Binary.swift -primary-file /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Bit.Order.swift -primary-file /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Collection\ UInt8.swift -primary-file /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/FixedWidthInteger+Binary.swift -primary-file /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int.swift -primary-file /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int16+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int16.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int32+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int32.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int64+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int64.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int8+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/Int8.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/RangeReplaceableCollection+Bytes.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/RawRepresentable+Format.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt16+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt16.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt32+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt32.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt64+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt64.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/UInt8+Parser.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-standards/Sources/Binary/exports.swift -supplementary-output-file-map /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/supplementaryOutputs-57 -target arm64-apple-macos26.0 -disable-cross-import-overlay-search -load-resolved-plugin 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/Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/PackageFrameworks -F /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -F /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -module-cache-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftExplicitPrecompiledModules -color-diagnostics -Xcc -fcolor-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=5 -suppress-warnings -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-upcoming-feature ExistentialAny -enable-upcoming-feature InternalImportsByDefault -enable-upcoming-feature MemberImportVisibility -enable-experimental-feature Lifetimes -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -user-module-version 0.30.1 -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/admin/builder -enable-anonymous-context-mangled-names -file-compilation-dir /Users/admin/builder -Xcc -fmodule-map-file\=/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-numerics/Sources/_NumericsShims/include/module.modulemap -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.build/out/SDKStatCaches.noindex/macosx27.0-26A425-80c5bbf1d171475443272936d42f90a36a22442a12e9d48fe1a705f55a1adfc4.sdkstatcache -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-numerics/Sources/_NumericsShims/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name Binary -package-name swift_standards -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Binary_const_extract_protocols.json -disable-clang-spi -clang-target arm64-apple-macos27.0 -target-sdk-version 27.0 -target-sdk-name macosx27.0 -in-process-plugin-server-path /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -parse-as-library -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Binary.o -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Bit.Order.o -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Collection\ UInt8.o -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/FixedWidthInteger+Binary.o -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Int.o -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Int16+Parser.o -debug-module-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Binary.swiftmodule -index-unit-output-path /swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Binary.o -index-unit-output-path /swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Bit.Order.o -index-unit-output-path /swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Collection\ UInt8.o -index-unit-output-path /swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/FixedWidthInteger+Binary.o -index-unit-output-path /swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Int.o -index-unit-output-path /swift-standards.build/Debug/Binary-t.build/Objects-normal/arm64/Int16+Parser.o -index-store-path /Users/admin/builder/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 macosSpm