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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[main] `Examples/Embedded` can't be built due to compiler crash","articleBody":"```console\n$ env SWIFT_SDK_ID=DEVELOPMENT-SNAPSHOT-2025-09-12-a-wasm32-unknown-wasip1 PATH=/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin:$PATH ./build.sh\n+++ dirname ./build.sh\n++ cd .\n++ pwd\n+ package_dir=/home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded\n+ JAVASCRIPTKIT_EXPERIMENTAL_EMBEDDED_WASM=true\n+ swift package --package-path /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded -c release --triple wasm32-unknown-none-wasm js\nBuilding for production...\n[0/5] Write sources\n[2/5] Write swift-version--44F4E3F61FEA6A0D.txt\n[4/6] Compiling JavaScriptKit JSArray.swift\n\u003cunknown\u003e:0: warning: flag '-mergeable-symbols' is deprecated\n/home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Sources/JavaScriptKit/FundamentalObjects/JSObject+CallAsFunction.swift:176:11: warning: 'JSFunction' is deprecated: Please use JSObject instead. JSFunction is unified with JSObject [#DeprecatedDeclaration]\n174 | // Once Embedded Swift supports parameter packs/variadic generics, we can\n175 | // replace all variants with a single method each that takes a generic pack.\n176 | extension JSFunction {\n    |           |- warning: 'JSFunction' is deprecated: Please use JSObject instead. JSFunction is unified with JSObject [#DeprecatedDeclaration]\n    |           `- note: use 'JSObject' instead\n177 |\n178 |     @discardableResult\n\n[#DeprecatedDeclaration]: \u003chttps://docs.swift.org/compiler/documentation/diagnostics/deprecated-declaration\u003e\nerror: compile command failed due to signal 6 (use -v to see invocation)\n\u003cunknown\u003e:0: warning: flag '-mergeable-symbols' is deprecated\nswift-frontend: /home/build-user/llvm-project/llvm/lib/IR/Instructions.cpp:693: void llvm::CallInst::init(FunctionType *, Value *, ArrayRef\u003cValue *\u003e, ArrayRef\u003cOperandBundleDef\u003e, const Twine \u0026): Assertion `(i \u003e= FTy-\u003egetNumParams() || FTy-\u003egetParamType(i) == Args[i]-\u003egetType()) \u0026\u0026 \"Calling a function with a bad signature!\"' failed.\nPlease submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.\nStack dump:\n0.      Program arguments: /home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend -frontend -c /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/Sources/EmbeddedApp/_thingsThatShouldNotBeNeeded.swift /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/Sources/EmbeddedApp/main.swift -emit-module-path /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/EmbeddedApp.build/EmbeddedApp.swiftmodule -emit-module-doc-path /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/EmbeddedApp.build/EmbeddedApp.swiftdoc -emit-module-source-info-path /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/EmbeddedApp.build/EmbeddedApp.swiftsourceinfo -emit-dependencies-path /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/EmbeddedApp.build/EmbeddedApp.d -serialize-diagnostics-path /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/EmbeddedApp.build/EmbeddedApp.dia -target wasm32-unknown-none-wasm -disable-objc-interop -I /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/Modules -color-diagnostics -Xcc -fcolor-diagnostics -g -debug-info-format=dwarf -dwarf-version=4 -module-cache-path /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/ModuleCache -swift-version 5 -O -D SWIFT_PACKAGE -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -mergeable-symbols -gnone -disable-stack-protector -enable-experimental-feature Embedded -enable-experimental-feature Extern -empty-abi-descriptor -file-compilation-dir /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded -Xcc -fmodule-map-file=/home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Sources/_CJavaScriptKit/include/module.modulemap -Xcc -I -Xcc /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Sources/_CJavaScriptKit/include -Xcc -fmodule-map-file=/home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/checkouts/swift-dlmalloc/Sources/dlmalloc/include/module.modulemap -Xcc -I -Xcc /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/checkouts/swift-dlmalloc/Sources/dlmalloc/include -Xcc -fdeclspec -Xcc -g -no-auto-bridging-header-chaining -module-name EmbeddedApp -package-name embedded -in-process-plugin-server-path /home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/lib/swift/host/libSwiftInProcPluginServer.so -plugin-path /home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/lib/swift/host/plugins -plugin-path /home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/local/lib/swift/host/plugins -enable-default-cmo -num-threads 16 -o /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/EmbeddedApp.build/_thingsThatShouldNotBeNeeded.swift.o -o /home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Examples/Embedded/.build/wasm32-unknown-none-wasm/release/EmbeddedApp.build/main.swift.o\n1.      Swift version 6.3-dev (LLVM f87967b246b2aeb, Swift 8ea97f31e555540)\n2.      Compiling with effective version 5.10\n3.      While emitting IR SIL function \"@$e13JavaScriptKit8JSObjectCyAA7JSValueOAA8JSSymbolCciM\".\n for \u003c\u003cdebugloc at \"/home/katei/ghq/github.com/swiftwasm/JavaScriptKit/Sources/JavaScriptKit/FundamentalObjects/JSObject.swift\":179:12\u003e\u003e #0 0x0000555cfe543ba8 llvm::sys::PrintStackTrace(llvm::raw_ostream\u0026, int) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x8c5eba8)\n #1 0x0000555cfe5416ce llvm::sys::RunSignalHandlers() (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x8c5c6ce)\n #2 0x0000555cfe544241 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0\n #3 0x00007f2425deb520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)\n #4 0x00007f2425e3f9fc __pthread_kill_implementation ./nptl/pthread_kill.c:44:76\n #5 0x00007f2425e3f9fc __pthread_kill_internal ./nptl/pthread_kill.c:78:10\n #6 0x00007f2425e3f9fc pthread_kill ./nptl/pthread_kill.c:89:10\n #7 0x00007f2425deb476 gsignal ./signal/../sysdeps/posix/raise.c:27:6\n #8 0x00007f2425dd17f3 abort ./stdlib/abort.c:81:7\n #9 0x00007f2425dd171b _nl_load_domain ./intl/loadmsgcat.c:1177:9\n#10 0x00007f2425de2e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)\n#11 0x0000555cfe195dd8 llvm::CallInst::init(llvm::FunctionType*, llvm::Value*, llvm::ArrayRef\u003cllvm::Value*\u003e, llvm::ArrayRef\u003cllvm::OperandBundleDefT\u003cllvm::Value*\u003e\u003e, llvm::Twine const\u0026) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x88b0dd8)\n#12 0x0000555cf6956c72 llvm::CallInst::Create(llvm::FunctionType*, llvm::Value*, llvm::ArrayRef\u003cllvm::Value*\u003e, llvm::ArrayRef\u003cllvm::OperandBundleDefT\u003cllvm::Value*\u003e\u003e, llvm::Twine const\u0026, llvm::InsertPosition) crtstuff.c:0:0\n#13 0x0000555cf6e2bb17 llvm::IRBuilderBase::CreateCall(llvm::FunctionType*, llvm::Value*, llvm::ArrayRef\u003cllvm::Value*\u003e, llvm::ArrayRef\u003cllvm::OperandBundleDefT\u003cllvm::Value*\u003e\u003e, llvm::Twine const\u0026, llvm::MDNode*) crtstuff.c:0:0\n#14 0x0000555cf6e2b570 swift::irgen::IRBuilder::CreateCallOrInvoke(swift::irgen::FunctionPointer const\u0026, llvm::ArrayRef\u003cllvm::Value*\u003e, llvm::BasicBlock*, llvm::BasicBlock*) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x1546570)\n#15 0x0000555cf6e22be3 swift::irgen::IRBuilder::CreateCall(swift::irgen::FunctionPointer const\u0026, llvm::ArrayRef\u003cllvm::Value*\u003e) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x153dbe3)\n#16 0x0000555cf6f0a848 void llvm::function_ref\u003cvoid (swift::irgen::IRGenFunction\u0026)\u003e::callback_fn\u003cswift::irgen::getCoroFrameAllocStubFn(swift::irgen::IRGenModule\u0026)::$_1\u003e(long, swift::irgen::IRGenFunction\u0026) GenFunc.cpp:0:0\n#17 0x0000555cf6ea9384 swift::irgen::IRGenModule::getOrCreateHelperFunction(llvm::StringRef, llvm::Type*, llvm::ArrayRef\u003cllvm::Type*\u003e, llvm::function_ref\u003cvoid (swift::irgen::IRGenFunction\u0026)\u003e, bool, bool, bool, swift::irgen::IRLinkage*, std::optional\u003cunsigned int\u003e, std::optional\u003cllvm::function_ref\u003cvoid (llvm::AttributeList\u0026)\u003e\u003e) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x15c4384)\n#18 0x0000555cf6ef80fd swift::irgen::getCoroFrameAllocStubFn(swift::irgen::IRGenModule\u0026) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x16130fd)\n#19 0x0000555cf6e35e44 swift::irgen::emitYieldOnceCoroutineEntry(swift::irgen::IRGenFunction\u0026, swift::CanTypeWrapper\u003cswift::SILFunctionType\u003e, swift::irgen::NativeCCEntryPointArgumentEmission\u0026) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x1550e44)\n#20 0x0000555cf6ffad07 (anonymous namespace)::IRGenSILFunction::emitSILFunction() IRGenSIL.cpp:0:0\n#21 0x0000555cf6ff96f5 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x17146f5)\n#22 0x0000555cf6e9207b swift::irgen::IRGenerator::emitLazyDefinitions() (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x15ad07b)\n#23 0x0000555cf6d0a122 swift::performIRGeneration(swift::ModuleDecl*, swift::IRGenOptions const\u0026, swift::TBDGenOptions const\u0026, std::unique_ptr\u003cswift::SILModule, std::default_delete\u003cswift::SILModule\u003e\u003e, llvm::StringRef, swift::PrimarySpecificPaths const\u0026, llvm::ArrayRef\u003cstd::__cxx11::basic_string\u003cchar, std::char_traits\u003cchar\u003e, std::allocator\u003cchar\u003e\u003e\u003e, llvm::GlobalVariable**) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0x1425122)\n#24 0x0000555cf6856d4a generateIR(swift::IRGenOptions const\u0026, swift::TBDGenOptions const\u0026, std::unique_ptr\u003cswift::SILModule, std::default_delete\u003cswift::SILModule\u003e\u003e, swift::PrimarySpecificPaths const\u0026, llvm::StringRef, llvm::PointerUnion\u003cswift::ModuleDecl*, swift::SourceFile*\u003e, llvm::GlobalVariable*\u0026, llvm::ArrayRef\u003cstd::__cxx11::basic_string\u003cchar, std::char_traits\u003cchar\u003e, std::allocator\u003cchar\u003e\u003e\u003e) FrontendTool.cpp:0:0\n#25 0x0000555cf6850133 performCompileStepsPostSILGen(swift::CompilerInstance\u0026, std::unique_ptr\u003cswift::SILModule, std::default_delete\u003cswift::SILModule\u003e\u003e, llvm::PointerUnion\u003cswift::ModuleDecl*, swift::SourceFile*\u003e, swift::PrimarySpecificPaths const\u0026, int\u0026, swift::FrontendObserver*) FrontendTool.cpp:0:0\n#26 0x0000555cf684eedf swift::performCompileStepsPostSema(swift::CompilerInstance\u0026, int\u0026, swift::FrontendObserver*) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0xf69edf)\n#27 0x0000555cf68651da withSemanticAnalysis(swift::CompilerInstance\u0026, swift::FrontendObserver*, llvm::function_ref\u003cbool (swift::CompilerInstance\u0026)\u003e, bool) FrontendTool.cpp:0:0\n#28 0x0000555cf6854214 performCompile(swift::CompilerInstance\u0026, int\u0026, swift::FrontendObserver*) FrontendTool.cpp:0:0\n#29 0x0000555cf6850ee1 swift::performFrontend(llvm::ArrayRef\u003cchar const*\u003e, char const*, void*, swift::FrontendObserver*) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0xf6bee1)\n#30 0x0000555cf65b5ec0 swift::mainEntry(int, char const**) (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0xcd0ec0)\n#31 0x00007f2425dd2d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16\n#32 0x00007f2425dd2e40 call_init ./csu/../csu/libc-start.c:128:20\n#33 0x00007f2425dd2e40 __libc_start_main ./csu/../csu/libc-start.c:379:5\n#34 0x0000555cf65b4f15 _start (/home/katei/.local/share/swiftly/toolchains/main-snapshot-2025-09-12/usr/bin/swift-frontend+0xccff15)\n\n*** Signal 6: Backtracing from 0x7f2425ec788d... done ***\n\n*** Program crashed: Aborted at 0x000003e800158011 ***\n\nPlatform: x86_64 Linux (Ubuntu 22.04.4 LTS)\n\nThread 0 \"swift-frontend\" crashed:\n\n  0  0x00007f2425ec788d syscall + 29 in libc.so.6\n...\n\n\nRegisters:\n\nrax 0x0000000000000000  0\nrdx 0x0000000000000006  6\nrcx 0x00007f2425ec788d  48 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00  H=·ðÿÿs·ÃH··sµ··\nrbx 0x0000000000000006  6\nrsi 0x0000000000158011  1409041\nrdi 0x0000000000158011  1409041\nrbp 0x0000000000158011  1409041\nrsp 0x0000555d08585428  6b 42 54 fe 5c 55 00 00 b0 56 58 08 5d 55 00 00  kBTþ\\U··°VX·]U··\n r8 0x0000555d085856b0  06 00 00 00 00 00 00 00 fa ff ff ff 00 00 00 00  ········úÿÿÿ····\n r9 0x0000555d085856b0  06 00 00 00 00 00 00 00 fa ff ff ff 00 00 00 00  ········úÿÿÿ····\nr10 0x0000555d085856b0  06 00 00 00 00 00 00 00 fa ff ff ff 00 00 00 00  ········úÿÿÿ····\nr11 0x0000000000000246  582\nr12 0x0000000000000000  0\nr13 0x0000000000000000  0\nr14 0x0000000000000000  0\nr15 0x0000555d08585438  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ················\nrip 0x00007f2425ec788d  48 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00  H=·ðÿÿs·ÃH··sµ··\n\nrflags 0x0000000000000246  ZF PF\n\ncs 0x0033  fs 0x0000  gs 0x0000\n\n\nImages (26 omitted):\n\n0x00007f2425da9000–0x00007f2425f65341 d5197096f709801829b118af1b7cf6631efa2dcd libc.so.6 /usr/lib/x86_64-linux-gnu/libc.so.6\n\nBacktrace took 0.01s\n\nerror: Plugin ended with exit code 1\n```","author":{"url":"https://github.com/kateinoigakukun","@type":"Person","name":"kateinoigakukun"},"datePublished":"2025-09-21T22:46:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/449/JavaScriptKit/issues/449"}