We discovered a problem recently where we would miscompile when imported ObjC lightweight generic classes are extended to conform to Swift protocols. This is being tracked by Apple as rdar://problem/28873860 <rdar://problem/28873860>, for reference, and should be release noted in upcoming Xcode seeds. If you happen to be extending any ObjC generic classes to conform to Swift protocols, there are a couple of workarounds that may work:
- making the protocol @objc, if possible, or - wrapping the ObjC class reference in a generic struct, and making that struct conform to the protocol instead of the class. Does that help at all? -Joe > On Oct 21, 2016, at 9:44 AM, Evan Maloney via swift-users > <swift-users@swift.org> wrote: > > This is definitely not my first time hitting Swift compiler crashes :) > > In the past, the stack traces have been helpful, pointing to what code the > compiler was working on when it crashed. Unfortunately, this latest crash > doesn't fall into that category: > > CompileSwift normal x86_64 > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Sources/iOS/FormBuilder/Row.swift > cd /Users/emaloney/Documents/Code/CleanroomProject/AppleTart > > /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift > -frontend -c -filelist > /var/folders/gn/gt76_ktx7w1010xg4v68p3txynz8ws/T/sources-a27d97 -primary-file > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Sources/iOS/FormBuilder/Row.swift > -target x86_64-apple-ios9.0 -enable-objc-interop -sdk > /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.0.sdk > -I > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator > -F > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator > -F > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Carthage/Checkouts/AppleApiDocClients/build/Debug > -F > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Carthage/Checkouts/AppleTapstreamClient/build/Debug > -F > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Carthage/Checkouts/PromiseKit/build/Debug > -enable-testing -g -import-objc-header > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/BuildControl/Bridging-Header.h > -module-cache-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/ModuleCache -D DEBUG > -serialize-debugging-options -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/swift-overrides.hmap > -Xcc -iquote -Xcc > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-generated-files.hmap > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-own-target-headers.hmap > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-all-non-framework-target-headers.hmap > -Xcc -ivfsoverlay -Xcc > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/all-product-headers.yaml > -Xcc -iquote -Xcc > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-project-headers.hmap > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator/include > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator/CardIO.framework/Headers > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/DerivedSources/x86_64 > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/DerivedSources > -Xcc -DDEBUG=1 -Xcc > -working-directory/Users/emaloney/Documents/Code/CleanroomProject/AppleTart > -emit-module-doc-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row~partial.swiftdoc > -Onone -module-name AppleTart -emit-module-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row~partial.swiftmodule > -serialize-diagnostics-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.dia > -emit-dependencies-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.d > -emit-reference-dependencies-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.swiftdeps > -o > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.o > > 0 swift 0x000000010e668b6d > PrintStackTraceSignalHandler(void*) + 45 > 1 swift 0x000000010e6685b6 SignalHandler(int) + 470 > 2 libsystem_platform.dylib 0x00007fff94a7b52a _sigtramp + 26 > 3 libsystem_platform.dylib 0x0000000000000004 _sigtramp + 1800948468 > 4 swift 0x000000010baa58d2 llvm::Value* > llvm::function_ref<llvm::Value* (unsigned > int)>::callback_fn<swift::irgen::emitArchetypeWitnessTableRef(swift::irgen::IRGenFunction&, > swift::CanTypeWrapper<swift::ArchetypeType>, > swift::ProtocolDecl*)::$_0>(long, unsigned int) + 530 > 5 swift 0x000000010bb83600 > swift::irgen::emitImpliedWitnessTableRef(swift::irgen::IRGenFunction&, > llvm::ArrayRef<swift::irgen::ProtocolEntry>, swift::ProtocolDecl*, > llvm::function_ref<llvm::Value* (unsigned int)> const&) + 240 > 6 swift 0x000000010baa56a7 > swift::irgen::emitArchetypeWitnessTableRef(swift::irgen::IRGenFunction&, > swift::CanTypeWrapper<swift::ArchetypeType>, swift::ProtocolDecl*) + 247 > 7 swift 0x000000010bb7f9cd > swift::SILWitnessVisitor<(anonymous > namespace)::WitnessTableBuilder>::visitProtocolDecl(swift::ProtocolDecl*) + > 5997 > 8 swift 0x000000010bb7d4d7 > swift::irgen::IRGenModule::emitSILWitnessTable(swift::SILWitnessTable*) + 503 > 9 swift 0x000000010baef8ed > swift::irgen::IRGenerator::emitGlobalTopLevel() + 2077 > 10 swift 0x000000010bbb0fcb > performIRGeneration(swift::IRGenOptions&, swift::ModuleDecl*, > swift::SILModule*, llvm::StringRef, llvm::LLVMContext&, swift::SourceFile*, > unsigned int) + 1259 > 11 swift 0x000000010ba7f1c7 > performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, > llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*) + 23687 > 12 swift 0x000000010ba77265 > swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, > swift::FrontendObserver*) + 17029 > 13 swift 0x000000010ba3482d main + 8685 > 14 libdyld.dylib 0x00007fff8ab5c5ad start + 1 > Stack dump: > 0. Program arguments: > /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift > -frontend -c -filelist > /var/folders/gn/gt76_ktx7w1010xg4v68p3txynz8ws/T/sources-a27d97 -primary-file > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Sources/iOS/FormBuilder/Row.swift > -target x86_64-apple-ios9.0 -enable-objc-interop -sdk > /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.0.sdk > -I > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator > -F > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator > -F > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Carthage/Checkouts/AppleApiDocClients/build/Debug > -F > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Carthage/Checkouts/AppleTapstreamClient/build/Debug > -F > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/Carthage/Checkouts/PromiseKit/build/Debug > -enable-testing -g -import-objc-header > /Users/emaloney/Documents/Code/CleanroomProject/AppleTart/BuildControl/Bridging-Header.h > -module-cache-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/ModuleCache -D DEBUG > -serialize-debugging-options -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/swift-overrides.hmap > -Xcc -iquote -Xcc > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-generated-files.hmap > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-own-target-headers.hmap > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-all-non-framework-target-headers.hmap > -Xcc -ivfsoverlay -Xcc > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/all-product-headers.yaml > -Xcc -iquote -Xcc > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/AppleTart-project-headers.hmap > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator/include > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Products/Debug-iphonesimulator/CardIO.framework/Headers > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/DerivedSources/x86_64 > -Xcc > -I/Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/DerivedSources > -Xcc -DDEBUG=1 -Xcc > -working-directory/Users/emaloney/Documents/Code/CleanroomProject/AppleTart > -emit-module-doc-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row~partial.swiftdoc > -Onone -module-name AppleTart -emit-module-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row~partial.swiftmodule > -serialize-diagnostics-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.dia > -emit-dependencies-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.d > -emit-reference-dependencies-path > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.swiftdeps > -o > /Users/emaloney/Library/Developer/Xcode/DerivedData/AppleTart-gydtadecugkemlbxcybcwsxuynku/Build/Intermediates/AppleTart.build/Debug-iphonesimulator/AppleTart-iOS.build/Objects-normal/x86_64/Row.o > > > > > >> On Oct 21, 2016, at 12:41 PM, Jon Shier <j...@jonshier.com >> <mailto:j...@jonshier.com>> wrote: >> >> With Swift 3 I’ve found these crashes to be indicative of an underlying >> source issue rather than something random in the compiler. When you get the >> crash, can you get the backtrace in the Xcode build log? Sometimes that has >> clues about what it was doing when it crashed. A lot of the time when the >> crash is during the parsing or SIL generation for one of your functions, it >> will note it and you can take a look, as there may be a type mismatch. >> >> >> >> Jon >> >>> On Oct 21, 2016, at 12:26 PM, Evan Maloney via swift-users >>> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote: >>> >>> After a gargantuan effort updating our entire codebase to Swift 3.0, we are >>> now being greeted with "Segmentation fault: 11" compiler crash whenever >>> attempting to build. >>> >>> The issue seems to be related to generics, and sounds similar to this issue: >>> >>> >>> http://stackoverflow.com/questions/39426535/segmentation-fault-11-xcode-8-swift-3-after-using-notificationcenter/39426812 >>> >>> <http://stackoverflow.com/questions/39426535/segmentation-fault-11-xcode-8-swift-3-after-using-notificationcenter/39426812> >>> >>> I've filed a bug report that includes our project codebase, which triggers >>> the issue 100% of the time: >>> >>> rdar://problem/28890409 >>> >>> The usual work-around of turning off Whole Module Optimization (which has >>> gotten around a lot of compiler crashes in the past) does not work here. >>> >>> Unfortunately, this code is in such a tangle of generics that undoing it is >>> not going to be simple. Until a new version of Xcode ships, we're pretty >>> much blocked from using Swift 3.0 unless another work-around is possible. >>> _______________________________________________ >>> swift-users mailing list >>> swift-users@swift.org >>> https://lists.swift.org/mailman/listinfo/swift-users >> > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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