lldwasm: Reporting stack dump due to lld crash

[anutosh491]

1. I am building an executable against emscripten
2. I am making this call target_link_libraries(target PUBLIC ... clangCppInterOp ....)

Now how clangCppInterOp is framed is
i) We basically unzip and extract object file out of these using ar/emar x libs

clangInterpreter;lldWasm;clangAST;clangAnalysis;clangBasic;clangCodeGen;clangDriver;clangFrontend;clangFrontendTool;clangLex;clangParse;clangSema;clangSerialization;LLVMCore;LLVMMC;LLVMOption;LLVMOrcJIT;LLVMOrcDebugging;LLVMOrcShared;LLVMOrcTargetProcess;LLVMSupport;LLVMTarget;LLVMTargetParser;LLVMWebAssemblyCodeGen;LLVMWebAssemblyAsmParser;LLVMWebAssemblyDesc;LLVMWebAssemblyDisassembler;LLVMWebAssemblyInfo;LLVMWebAssemblyUtils;lldCommon;LLVMBinaryFormat;LLVMDemangle;LLVMLTO;LLVMObject;LLVMPasses;LLVMFrontendOpenMP;clangASTMatchers;LLVMAggressiveInstCombine;LLVMAnalysis;LLVMBitReader;LLVMBitWriter;LLVMCodeGenTypes;LLVMCoroutines;LLVMCoverage;LLVMExtensions;LLVMFrontendDriver;LLVMFrontendHLSL;LLVMFrontendOffloading;LLVMHipStdPar;LLVMipo;LLVMIRPrinter;LLVMIRReader;LLVMInstCombine;LLVMInstrumentation;LLVMLinker;LLVMObjCARCOpts;LLVMProfileData;LLVMScalarOpts;LLVMTransformUtils;LLVMWindowsDriver;clangAPINotes;clangEdit;LLVMBitstreamReader;clangExtractAPI;clangRewriteFrontend;clangARCMigrate;clangStaticAnalyzerFrontend;LLVMMCParser;clangSupport;LLVMRemarks;LLVMDebugInfoCodeView;LLVMExecutionEngine;LLVMJITLink;LLVMRuntimeDyld;LLVMDebugInfoDWARF;LLVMAsmPrinter;LLVMCodeGen;LLVMSelectionDAG;LLVMMCDisassembler;LLVMTextAPI;LLVMCFGuard;LLVMVectorize;LLVMAsmParser;LLVMSymbolize;clangIndex;clangInstallAPI;clangRewrite;clangCrossTU;clangStaticAnalyzerCheckers;clangStaticAnalyzerCore;LLVMDebugInfoPDB;LLVMDebugInfoBTF;clangFormat;clangToolingCore;LLVMTextAPIBinaryReader;LLVMDebugInfoMSF;clangToolingInclusions, LLVMSupport

All these are static libraries obtained from a wasm build for llvm

ii) Then we club these into a final libclangCppInterOp.a using ar/emar qc ...

Now when i move onto my executable using clangCppInterOp (linking with it) .... although the build works I end up getting this error. It says maybe reporting the crash would help

[100%] Linking CXX executable xcpp.js
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/wasm-ld -o xcpp.wasm --whole-archive CMakeFiles/xcpp.dir/src/main_emscripten_kernel.cpp.o /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus-lite.a libxeus-cpp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libclangCppInterOp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libpugixml.a -L/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/pic -lembind-rtti -lGL -lal -lhtml5 -lstubs -lc-asan -ldlmalloc -lcompiler_rt -lc++ -lc++abi -lsockets -lasan_rt -lasan_js -lubsan_rt -llsan_common_rt -lsanitizer_common_rt --no-whole-archive -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-cxx-exceptions -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export-if-defined=setThrew --export-if-defined=malloc --export-if-defined=__errno_location --export-if-defined=htons --export-if-defined=ntohs --export-if-defined=memcpy --export-if-defined=free --export-if-defined=htonl --export-if-defined=_emscripten_timeout --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=emscripten_builtin_memalign --export-if-defined=__cxa_is_pointer_type --export-if-defined=setTempRet0 --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=__get_exception_message --export-if-defined=fileno --export-if-defined=__dl_seterr --export-if-defined=memcmp --export-if-defined=sleep --export-if-defined=__getTypeName /var/folders/m1/cdn74f917994jd99d_2cpf440000gn/T/tmpzt4d3u33libemscripten_js_symbols.so --import-undefined --import-memory --strip-debug --export-dynamic --export-if-defined=main --export-if-defined=__start_em_asm --export-if-defined=__stop_em_asm --export-if-defined=__start_em_lib_deps --export-if-defined=__stop_em_lib_deps --export-if-defined=__start_em_js --export-if-defined=__stop_em_js --export-if-defined=__main_argc_argv --export-if-defined=__wasm_apply_data_relocs --export-if-defined=fflush --export-if-defined=stackSave --export-if-defined=stackRestore --export-if-defined=stackAlloc --export-if-defined=__errno_location --export-if-defined=memalign --export-if-defined=emscripten_builtin_memalign --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=_asan_c_load_1 --export-if-defined=_asan_c_load_1u --export-if-defined=_asan_c_load_2 --export-if-defined=_asan_c_load_2u --export-if-defined=_asan_c_load_4 --export-if-defined=_asan_c_load_4u --export-if-defined=_asan_c_load_f --export-if-defined=_asan_c_load_d --export-if-defined=_asan_c_store_1 --export-if-defined=_asan_c_store_1u --export-if-defined=_asan_c_store_2 --export-if-defined=_asan_c_store_2u --export-if-defined=_asan_c_store_4 --export-if-defined=_asan_c_store_4u --export-if-defined=_asan_c_store_f --export-if-defined=_asan_c_store_d --export-if-defined=__funcs_on_exit --export-if-defined=malloc --export-if-defined=free --export-if-defined=__cxa_is_pointer_type --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=setThrew --export-if-defined=__cxa_free_exception --export-if-defined=__wasm_call_ctors --experimental-pic -pie -z stack-size=67108864 --initial-memory=575275008 --max-memory=2147483648 --no-entry
 #0 0x0000000102365e50 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100125e50)
 #1 0x0000000102363e60 llvm::sys::RunSignalHandlers() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100123e60)
 #2 0x0000000102366a24 SignalHandler(int) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100126a24)
 #3 0x0000000195057584 (/usr/lib/system/libsystem_platform.dylib+0x180477584)
 #4 0x00000001026bc38c lld::wasm::ElemSection::writeBody() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x10047c38c)
 #5 0x00000001026d4454 lld::wasm::SyntheticSection::finalizeContents() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100494454)
 #6 0x00000001026d0330 lld::wasm::(anonymous namespace)::Writer::run() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100490330)
 #7 0x00000001026c7174 lld::wasm::writeResult() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100487174)
 #8 0x00000001026960b8 lld::wasm::(anonymous namespace)::LinkerDriver::linkerMain(llvm::ArrayRef<char const*>) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x1004560b8)
 #9 0x00000001026921ac lld::wasm::link(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, bool, bool) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x1004521ac)
#10 0x0000000102377144 lld::unsafeLldMain(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, llvm::ArrayRef<lld::DriverDef>, bool) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100137144)
#11 0x00000001022c156c lld_main(int, char**, llvm::ToolContext const&) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x10008156c)
#12 0x00000001022c1bf0 main (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100081bf0)
#13 0x0000000194c9e0e0 
em++: error: '/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/wasm-ld -o xcpp.wasm --whole-archive CMakeFiles/xcpp.dir/src/main_emscripten_kernel.cpp.o /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus-lite.a libxeus-cpp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libclangCppInterOp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libpugixml.a -L/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/pic -lembind-rtti -lGL -lal -lhtml5 -lstubs -lc-asan -ldlmalloc -lcompiler_rt -lc++ -lc++abi -lsockets -lasan_rt -lasan_js -lubsan_rt -llsan_common_rt -lsanitizer_common_rt --no-whole-archive -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-cxx-exceptions -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export-if-defined=setThrew --export-if-defined=malloc --export-if-defined=__errno_location --export-if-defined=htons --export-if-defined=ntohs --export-if-defined=memcpy --export-if-defined=free --export-if-defined=htonl --export-if-defined=_emscripten_timeout --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=emscripten_builtin_memalign --export-if-defined=__cxa_is_pointer_type --export-if-defined=setTempRet0 --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=__get_exception_message --export-if-defined=fileno --export-if-defined=__dl_seterr --export-if-defined=memcmp --export-if-defined=sleep --export-if-defined=__getTypeName /var/folders/m1/cdn74f917994jd99d_2cpf440000gn/T/tmpzt4d3u33libemscripten_js_symbols.so --import-undefined --import-memory --strip-debug --export-dynamic --export-if-defined=main --export-if-defined=__start_em_asm --export-if-defined=__stop_em_asm --export-if-defined=__start_em_lib_deps --export-if-defined=__stop_em_lib_deps --export-if-defined=__start_em_js --export-if-defined=__stop_em_js --export-if-defined=__main_argc_argv --export-if-defined=__wasm_apply_data_relocs --export-if-defined=fflush --export-if-defined=stackSave --export-if-defined=stackRestore --export-if-defined=stackAlloc --export-if-defined=__errno_location --export-if-defined=memalign --export-if-defined=emscripten_builtin_memalign --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=_asan_c_load_1 --export-if-defined=_asan_c_load_1u --export-if-defined=_asan_c_load_2 --export-if-defined=_asan_c_load_2u --export-if-defined=_asan_c_load_4 --export-if-defined=_asan_c_load_4u --export-if-defined=_asan_c_load_f --export-if-defined=_asan_c_load_d --export-if-defined=_asan_c_store_1 --export-if-defined=_asan_c_store_1u --export-if-defined=_asan_c_store_2 --export-if-defined=_asan_c_store_2u --export-if-defined=_asan_c_store_4 --export-if-defined=_asan_c_store_4u --export-if-defined=_asan_c_store_f --export-if-defined=_asan_c_store_d --export-if-defined=__funcs_on_exit --export-if-defined=malloc --export-if-defined=free --export-if-defined=__cxa_is_pointer_type --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=setThrew --export-if-defined=__cxa_free_exception --export-if-defined=__wasm_call_ctors --experimental-pic -pie -z stack-size=67108864 --initial-memory=575275008 --max-memory=2147483648 --no-entry' failed (received SIGSEGV (-11))
make[2]: *** [xcpp.js] Error 1
make[1]: *** [CMakeFiles/xcpp.dir/all] Error 2
make: *** [all] Error 2
emmake: error: 'make install' failed (returned 2)

Not sure what might be the reason behind this !

[llvmbot]

@llvm/issue-subscribers-lld-wasm

Author: Anutosh Bhat (anutosh491)

1) I am building an executable against emscripten 2) I am making this call `target_link_libraries(target PUBLIC ... clangCppInterOp ....)`

Now how clangCppInterOp is framed is
i) We basically unzip and extract object file out of these using ar/emar x libs

clangInterpreter;lldWasm;clangAST;clangAnalysis;clangBasic;clangCodeGen;clangDriver;clangFrontend;clangFrontendTool;clangLex;clangParse;clangSema;clangSerialization;LLVMCore;LLVMMC;LLVMOption;LLVMOrcJIT;LLVMOrcDebugging;LLVMOrcShared;LLVMOrcTargetProcess;LLVMSupport;LLVMTarget;LLVMTargetParser;LLVMWebAssemblyCodeGen;LLVMWebAssemblyAsmParser;LLVMWebAssemblyDesc;LLVMWebAssemblyDisassembler;LLVMWebAssemblyInfo;LLVMWebAssemblyUtils;lldCommon;LLVMBinaryFormat;LLVMDemangle;LLVMLTO;LLVMObject;LLVMPasses;LLVMFrontendOpenMP;clangASTMatchers;LLVMAggressiveInstCombine;LLVMAnalysis;LLVMBitReader;LLVMBitWriter;LLVMCodeGenTypes;LLVMCoroutines;LLVMCoverage;LLVMExtensions;LLVMFrontendDriver;LLVMFrontendHLSL;LLVMFrontendOffloading;LLVMHipStdPar;LLVMipo;LLVMIRPrinter;LLVMIRReader;LLVMInstCombine;LLVMInstrumentation;LLVMLinker;LLVMObjCARCOpts;LLVMProfileData;LLVMScalarOpts;LLVMTransformUtils;LLVMWindowsDriver;clangAPINotes;clangEdit;LLVMBitstreamReader;clangExtractAPI;clangRewriteFrontend;clangARCMigrate;clangStaticAnalyzerFrontend;LLVMMCParser;clangSupport;LLVMRemarks;LLVMDebugInfoCodeView;LLVMExecutionEngine;LLVMJITLink;LLVMRuntimeDyld;LLVMDebugInfoDWARF;LLVMAsmPrinter;LLVMCodeGen;LLVMSelectionDAG;LLVMMCDisassembler;LLVMTextAPI;LLVMCFGuard;LLVMVectorize;LLVMAsmParser;LLVMSymbolize;clangIndex;clangInstallAPI;clangRewrite;clangCrossTU;clangStaticAnalyzerCheckers;clangStaticAnalyzerCore;LLVMDebugInfoPDB;LLVMDebugInfoBTF;clangFormat;clangToolingCore;LLVMTextAPIBinaryReader;LLVMDebugInfoMSF;clangToolingInclusions, LLVMSupport

All these are static libraries obtained from a wasm build for llvm

ii) Then we club these into a final libclangCppInterOp.a using ar/emar qc ...

Now when i move onto my executable using clangCppInterOp (linking with it) .... although the build works I end up getting this error. It says maybe reporting the crash would help

[100%] Linking CXX executable xcpp.js
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/wasm-ld -o xcpp.wasm --whole-archive CMakeFiles/xcpp.dir/src/main_emscripten_kernel.cpp.o /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus-lite.a libxeus-cpp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libclangCppInterOp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libpugixml.a -L/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/pic -lembind-rtti -lGL -lal -lhtml5 -lstubs -lc-asan -ldlmalloc -lcompiler_rt -lc++ -lc++abi -lsockets -lasan_rt -lasan_js -lubsan_rt -llsan_common_rt -lsanitizer_common_rt --no-whole-archive -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-cxx-exceptions -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export-if-defined=setThrew --export-if-defined=malloc --export-if-defined=__errno_location --export-if-defined=htons --export-if-defined=ntohs --export-if-defined=memcpy --export-if-defined=free --export-if-defined=htonl --export-if-defined=_emscripten_timeout --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=emscripten_builtin_memalign --export-if-defined=__cxa_is_pointer_type --export-if-defined=setTempRet0 --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=__get_exception_message --export-if-defined=fileno --export-if-defined=__dl_seterr --export-if-defined=memcmp --export-if-defined=sleep --export-if-defined=__getTypeName /var/folders/m1/cdn74f917994jd99d_2cpf440000gn/T/tmpzt4d3u33libemscripten_js_symbols.so --import-undefined --import-memory --strip-debug --export-dynamic --export-if-defined=main --export-if-defined=__start_em_asm --export-if-defined=__stop_em_asm --export-if-defined=__start_em_lib_deps --export-if-defined=__stop_em_lib_deps --export-if-defined=__start_em_js --export-if-defined=__stop_em_js --export-if-defined=__main_argc_argv --export-if-defined=__wasm_apply_data_relocs --export-if-defined=fflush --export-if-defined=stackSave --export-if-defined=stackRestore --export-if-defined=stackAlloc --export-if-defined=__errno_location --export-if-defined=memalign --export-if-defined=emscripten_builtin_memalign --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=_asan_c_load_1 --export-if-defined=_asan_c_load_1u --export-if-defined=_asan_c_load_2 --export-if-defined=_asan_c_load_2u --export-if-defined=_asan_c_load_4 --export-if-defined=_asan_c_load_4u --export-if-defined=_asan_c_load_f --export-if-defined=_asan_c_load_d --export-if-defined=_asan_c_store_1 --export-if-defined=_asan_c_store_1u --export-if-defined=_asan_c_store_2 --export-if-defined=_asan_c_store_2u --export-if-defined=_asan_c_store_4 --export-if-defined=_asan_c_store_4u --export-if-defined=_asan_c_store_f --export-if-defined=_asan_c_store_d --export-if-defined=__funcs_on_exit --export-if-defined=malloc --export-if-defined=free --export-if-defined=__cxa_is_pointer_type --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=setThrew --export-if-defined=__cxa_free_exception --export-if-defined=__wasm_call_ctors --experimental-pic -pie -z stack-size=67108864 --initial-memory=575275008 --max-memory=2147483648 --no-entry
 #<!-- -->0 0x0000000102365e50 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100125e50)
 #<!-- -->1 0x0000000102363e60 llvm::sys::RunSignalHandlers() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100123e60)
 #<!-- -->2 0x0000000102366a24 SignalHandler(int) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100126a24)
 #<!-- -->3 0x0000000195057584 (/usr/lib/system/libsystem_platform.dylib+0x180477584)
 #<!-- -->4 0x00000001026bc38c lld::wasm::ElemSection::writeBody() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x10047c38c)
 #<!-- -->5 0x00000001026d4454 lld::wasm::SyntheticSection::finalizeContents() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100494454)
 #<!-- -->6 0x00000001026d0330 lld::wasm::(anonymous namespace)::Writer::run() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100490330)
 #<!-- -->7 0x00000001026c7174 lld::wasm::writeResult() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100487174)
 #<!-- -->8 0x00000001026960b8 lld::wasm::(anonymous namespace)::LinkerDriver::linkerMain(llvm::ArrayRef&lt;char const*&gt;) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x1004560b8)
 #<!-- -->9 0x00000001026921ac lld::wasm::link(llvm::ArrayRef&lt;char const*&gt;, llvm::raw_ostream&amp;, llvm::raw_ostream&amp;, bool, bool) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x1004521ac)
#<!-- -->10 0x0000000102377144 lld::unsafeLldMain(llvm::ArrayRef&lt;char const*&gt;, llvm::raw_ostream&amp;, llvm::raw_ostream&amp;, llvm::ArrayRef&lt;lld::DriverDef&gt;, bool) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100137144)
#<!-- -->11 0x00000001022c156c lld_main(int, char**, llvm::ToolContext const&amp;) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x10008156c)
#<!-- -->12 0x00000001022c1bf0 main (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100081bf0)
#<!-- -->13 0x0000000194c9e0e0 
em++: error: '/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/wasm-ld -o xcpp.wasm --whole-archive CMakeFiles/xcpp.dir/src/main_emscripten_kernel.cpp.o /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus-lite.a libxeus-cpp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libclangCppInterOp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libpugixml.a -L/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/pic -lembind-rtti -lGL -lal -lhtml5 -lstubs -lc-asan -ldlmalloc -lcompiler_rt -lc++ -lc++abi -lsockets -lasan_rt -lasan_js -lubsan_rt -llsan_common_rt -lsanitizer_common_rt --no-whole-archive -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-cxx-exceptions -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export-if-defined=setThrew --export-if-defined=malloc --export-if-defined=__errno_location --export-if-defined=htons --export-if-defined=ntohs --export-if-defined=memcpy --export-if-defined=free --export-if-defined=htonl --export-if-defined=_emscripten_timeout --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=emscripten_builtin_memalign --export-if-defined=__cxa_is_pointer_type --export-if-defined=setTempRet0 --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=__get_exception_message --export-if-defined=fileno --export-if-defined=__dl_seterr --export-if-defined=memcmp --export-if-defined=sleep --export-if-defined=__getTypeName /var/folders/m1/cdn74f917994jd99d_2cpf440000gn/T/tmpzt4d3u33libemscripten_js_symbols.so --import-undefined --import-memory --strip-debug --export-dynamic --export-if-defined=main --export-if-defined=__start_em_asm --export-if-defined=__stop_em_asm --export-if-defined=__start_em_lib_deps --export-if-defined=__stop_em_lib_deps --export-if-defined=__start_em_js --export-if-defined=__stop_em_js --export-if-defined=__main_argc_argv --export-if-defined=__wasm_apply_data_relocs --export-if-defined=fflush --export-if-defined=stackSave --export-if-defined=stackRestore --export-if-defined=stackAlloc --export-if-defined=__errno_location --export-if-defined=memalign --export-if-defined=emscripten_builtin_memalign --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=_asan_c_load_1 --export-if-defined=_asan_c_load_1u --export-if-defined=_asan_c_load_2 --export-if-defined=_asan_c_load_2u --export-if-defined=_asan_c_load_4 --export-if-defined=_asan_c_load_4u --export-if-defined=_asan_c_load_f --export-if-defined=_asan_c_load_d --export-if-defined=_asan_c_store_1 --export-if-defined=_asan_c_store_1u --export-if-defined=_asan_c_store_2 --export-if-defined=_asan_c_store_2u --export-if-defined=_asan_c_store_4 --export-if-defined=_asan_c_store_4u --export-if-defined=_asan_c_store_f --export-if-defined=_asan_c_store_d --export-if-defined=__funcs_on_exit --export-if-defined=malloc --export-if-defined=free --export-if-defined=__cxa_is_pointer_type --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=setThrew --export-if-defined=__cxa_free_exception --export-if-defined=__wasm_call_ctors --experimental-pic -pie -z stack-size=67108864 --initial-memory=575275008 --max-memory=2147483648 --no-entry' failed (received SIGSEGV (-11))
make[2]: *** [xcpp.js] Error 1
make[1]: *** [CMakeFiles/xcpp.dir/all] Error 2
make: *** [all] Error 2
emmake: error: 'make install' failed (returned 2)

Not sure what might be the reason behind this !

[EugeneZelenko]

@anutosh491: Could you please provide reproducer?

[anutosh491]

Hmm, don't have an immediate minimalistic repoducer but if you are looking for the command responsible for this I have shared it above
/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/wasm-ld -o xcpp.wasm --whole-archive CMakeFiles/xcpp.dir/src/main_emscripten_kernel.cpp.o /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus-lite.a libxeus-cpp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libxeus.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libclangCppInterOp.a /Users/anutosh491/micromamba/envs/xeus-cpp-wasm-host/lib/libpugixml.a -L/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/pic -lembind-rtti -lGL -lal -lhtml5 -lstubs -lc-asan -ldlmalloc -lcompiler_rt -lc++ -lc++abi -lsockets -lasan_rt -lasan_js -lubsan_rt -llsan_common_rt -lsanitizer_common_rt --no-whole-archive -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-cxx-exceptions -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export-if-defined=setThrew --export-if-defined=malloc --export-if-defined=__errno_location --export-if-defined=htons --export-if-defined=ntohs --export-if-defined=memcpy --export-if-defined=free --export-if-defined=htonl --export-if-defined=_emscripten_timeout --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=emscripten_builtin_memalign --export-if-defined=__cxa_is_pointer_type --export-if-defined=setTempRet0 --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=__get_exception_message --export-if-defined=fileno --export-if-defined=__dl_seterr --export-if-defined=memcmp --export-if-defined=sleep --export-if-defined=__getTypeName /var/folders/m1/cdn74f917994jd99d_2cpf440000gn/T/tmpzt4d3u33libemscripten_js_symbols.so --import-undefined --import-memory --strip-debug --export-dynamic --export-if-defined=main --export-if-defined=__start_em_asm --export-if-defined=__stop_em_asm --export-if-defined=__start_em_lib_deps --export-if-defined=__stop_em_lib_deps --export-if-defined=__start_em_js --export-if-defined=__stop_em_js --export-if-defined=__main_argc_argv --export-if-defined=__wasm_apply_data_relocs --export-if-defined=fflush --export-if-defined=stackSave --export-if-defined=stackRestore --export-if-defined=stackAlloc --export-if-defined=__errno_location --export-if-defined=memalign --export-if-defined=emscripten_builtin_memalign --export-if-defined=emscripten_builtin_malloc --export-if-defined=emscripten_builtin_free --export-if-defined=_asan_c_load_1 --export-if-defined=_asan_c_load_1u --export-if-defined=_asan_c_load_2 --export-if-defined=_asan_c_load_2u --export-if-defined=_asan_c_load_4 --export-if-defined=_asan_c_load_4u --export-if-defined=_asan_c_load_f --export-if-defined=_asan_c_load_d --export-if-defined=_asan_c_store_1 --export-if-defined=_asan_c_store_1u --export-if-defined=_asan_c_store_2 --export-if-defined=_asan_c_store_2u --export-if-defined=_asan_c_store_4 --export-if-defined=_asan_c_store_4u --export-if-defined=_asan_c_store_f --export-if-defined=_asan_c_store_d --export-if-defined=__funcs_on_exit --export-if-defined=malloc --export-if-defined=free --export-if-defined=__cxa_is_pointer_type --export-if-defined=__cxa_can_catch --export-if-defined=__cxa_increment_exception_refcount --export-if-defined=__cxa_decrement_exception_refcount --export-if-defined=setThrew --export-if-defined=__cxa_free_exception --export-if-defined=__wasm_call_ctors --experimental-pic -pie -z stack-size=67108864 --initial-memory=575275008 --max-memory=2147483648 --no-entry

[anutosh491]

Using 3.1.45-asserts gives us some more info

Assertion failed: (isa<To>(Val) && "cast<Ty>() argument of incompatible type!"), function cast, file /opt/s/w/ir/cache/builder/emscripten-releases/llvm-project/llvm/include/llvm/Support/Casting.h, line 578.
......
 #0 0x0000000106ccffac llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/lib/libLLVM.dylib+0x15bfac)
 #1 0x0000000106ccdfb4 llvm::sys::RunSignalHandlers() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/lib/libLLVM.dylib+0x159fb4)
 #2 0x0000000106cd0620 SignalHandler(int) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/lib/libLLVM.dylib+0x15c620)
 #3 0x0000000195057584 (/usr/lib/system/libsystem_platform.dylib+0x180477584)
 #4 0x0000000195026c20 (/usr/lib/system/libsystem_pthread.dylib+0x180446c20)
 #5 0x0000000194f33a30 (/usr/lib/system/libsystem_c.dylib+0x180353a30)
 #6 0x0000000194f32d20 (/usr/lib/system/libsystem_c.dylib+0x180352d20)
 #7 0x00000001024fb690 lld::wasm::FunctionSymbol::setFunctionIndex(unsigned int) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x10031f690)
 #8 0x0000000102503cc4 lld::wasm::ElemSection::writeBody() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100327cc4)
 #9 0x000000010251ede8 lld::wasm::SyntheticSection::finalizeContents() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100342de8)
#10 0x000000010251aab4 lld::wasm::(anonymous namespace)::Writer::run() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x10033eab4)
#11 0x0000000102512ad8 lld::wasm::writeResult() (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100336ad8)
#12 0x00000001024d9a98 lld::wasm::(anonymous namespace)::LinkerDriver::linkerMain(llvm::ArrayRef<char const*>) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x1002fda98)
#13 0x00000001024d62c0 lld::wasm::link(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, bool, bool) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x1002fa2c0)
#14 0x00000001021def20 lld::unsafeLldMain(llvm::ArrayRef<char const*>, llvm::raw_ostream&, llvm::raw_ostream&, llvm::ArrayRef<lld::DriverDef>, bool) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100002f20)
#15 0x00000001021dda64 lld_main(int, char**, llvm::ToolContext const&) (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x100001a64)
#16 0x00000001021de0dc main (/Users/anutosh491/micromamba/envs/xeus-cpp-wasm-build/lib/python3.13/site-packages/emsdk/upstream/bin/lld+0x1000020dc)
#17 0x0000000194c9e0e0 

[sbc100]

One way to share a reproducer for a crash in wasm-ld is it add the --reproduce=filename.tar to the linker flags. For clang flags that would be -Wl,--reproduce=filename.tar.

[anutosh491]

Ohh didn't know about this flag. Shall give it a try and get back

Untill then these are somethings I could observe

1. I see quite some similar issues on emscripten/llvm. Some of them were raised with a LTO context and I see some fixes relevant fixes were made too ([lld][WebAssembly] Fix bitcode LTO order in archive parsing #73095). Now although the issue being encountered is the same (isa<To>(Val) && "cast<Ty>() argument of incompatible type!") I haven't used the lto flag anywhere (would using that help ... my attempt says not really)

2. I was not sure about some flags and hence was just experimenting around
   i) Also just getting rid of libclangCppInterOp.a in the linking step atleast gives us xcpp.js and xcpp.wasm (although we obviously need to link against it ... not sure this confirms if the error comes out of libclangCppInterOp.a)
   ii) getting rid of the whole-archive and the no-whole-archive flags doesn't help (and also moving libclangCppInterOp.a in and out)
   iii) Increasing max-memory from 2GB to 4GB ( --max-memory=4294967296) didn't help

[sbc100]

Ohh didn't know about this flag. Shall give it a try and get back

Untill then these are somethings I could observe

1. I see quite some similar issues on emscripten/llvm. Some of them were raised with a LTO context and I see some fixes relevant fixes were made too ([lld][WebAssembly] Fix bitcode LTO order in archive parsing #73095). Now although the issue being encountered is the same (isa<To>(Val) && "cast<Ty>() argument of incompatible type!") I haven't used the lto flag anywhere (would using that help ... my attempt says not really)

No, adding LTO would only complicate things.

2. I was not sure about some flags and hence was just experimenting around
   i) Also just getting rid of libclangCppInterOp.a in the linking step atleast gives us xcpp.js and xcpp.wasm (although we obviously need to link against it ... not sure this confirms if the error comes out of libclangCppInterOp.a)
   ii) getting rid of the whole-archive and the no-whole-archive flags doesn't help (and also moving libclangCppInterOp.a in and out)
   iii) Increasing max-memory from 2GB to 4GB ( --max-memory=4294967296) didn't help

I think this bug needs to be addressed regardless of any workaround you might be able to find.