clang -std=c++23 -fmodules -stdlib=libc++ test.cpp failed

[zyp2005]

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	/usr/bin/../include/c++/v1/__system_error/error_condition.h:28:1: current parser token 'template'
1.	/usr/bin/../include/c++/v1/__system_error/error_condition.h:26:1 <Spelling=/usr/bin/../include/c++/v1/__config:884:39>: parsing namespace 'std'
 #0 0x00007c79adfc4d90 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/libLLVM.so.18.1+0x7c4d90)
 #1 0x00007c79adfc1d4d (/usr/lib/libLLVM.so.18.1+0x7c1d4d)
 #2 0x00007c79ad24c1d0 (/usr/lib/libc.so.6+0x3d1d0)
 #3 0x00007c79b7886ed8 llvm::SmallVectorBase<unsigned int>::size() const /usr/include/llvm/ADT/SmallVector.h:91:32
 #4 0x00007c79b7886ed8 llvm::SmallVectorTemplateCommon<std::pair<clang::Decl*, clang::FunctionDecl*>, void>::end() /usr/include/llvm/ADT/SmallVector.h:282:41
 #5 0x00007c79b7886ed8 llvm::SmallVectorTemplateBase<std::pair<clang::Decl*, clang::FunctionDecl*>, true>::push_back(std::pair<clang::Decl*, clang::FunctionDecl*>) /usr/include/llvm/ADT/SmallVector.h:576:46
 #6 0x00007c79b7886ed8 std::pair<clang::Decl*, clang::FunctionDecl*>& llvm::SmallVectorTemplateBase<std::pair<clang::Decl*, clang::FunctionDecl*>, true>::growAndEmplaceBack<std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>, std::tuple<clang::FunctionDecl*&&>>(std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>&&, std::tuple<clang::FunctionDecl*&&>&&) /usr/include/llvm/ADT/SmallVector.h:569:14
 #7 0x00007c79b7886ed8 std::pair<clang::Decl*, clang::FunctionDecl*>& llvm::SmallVectorImpl<std::pair<clang::Decl*, clang::FunctionDecl*>>::emplace_back<std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>, std::tuple<clang::FunctionDecl*&&>>(std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>&&, std::tuple<clang::FunctionDecl*&&>&&) /usr/include/llvm/ADT/SmallVector.h:952:38
 #8 0x00007c79b7886ed8 std::pair<clang::Decl*, clang::FunctionDecl*>& llvm::SmallVectorImpl<std::pair<clang::Decl*, clang::FunctionDecl*>>::emplace_back<std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>, std::tuple<clang::FunctionDecl*&&>>(std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>&&, std::tuple<clang::FunctionDecl*&&>&&) /usr/include/llvm/ADT/SmallVector.h:950:0
 #9 0x00007c79b7886ed8 std::pair<std::pair<clang::Decl*, clang::FunctionDecl*>*, bool> llvm::MapVector<clang::Decl*, clang::FunctionDecl*, llvm::SmallDenseMap<clang::Decl*, unsigned int, 4u, llvm::DenseMapInfo<clang::Decl*, void>, llvm::detail::DenseMapPair<clang::Decl*, unsigned int>>, llvm::SmallVector<std::pair<clang::Decl*, clang::FunctionDecl*>, 4u>>::try_emplace<clang::FunctionDecl*>(clang::Decl*&&, clang::FunctionDecl*&&) /usr/include/llvm/ADT/MapVector.h:133:26
#10 0x00007c79b7886ed8 llvm::MapVector<clang::Decl*, clang::FunctionDecl*, llvm::SmallDenseMap<clang::Decl*, unsigned int, 4u, llvm::DenseMapInfo<clang::Decl*, void>, llvm::detail::DenseMapPair<clang::Decl*, unsigned int>>, llvm::SmallVector<std::pair<clang::Decl*, clang::FunctionDecl*>, 4u>>::insert(std::pair<clang::Decl*, clang::FunctionDecl*>&&) /usr/include/llvm/ADT/MapVector.h:145:23
#11 0x00007c79b7886ed8 void clang::ASTDeclReader::attachPreviousDeclImpl<clang::FunctionDecl>(clang::ASTReader&, clang::Redeclarable<clang::FunctionDecl>*, clang::Decl*, clang::Decl*) /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReaderDecl.cpp:3660:48
#12 0x00007c79b78a2b71 clang::ASTReader::finishPendingActions() /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReader.cpp:9571:28
#13 0x00007c79b78ade9e clang::ASTReader::FinishedDeserializing() /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReader.cpp:10090:3
#14 0x00007c79b78ade9e clang::ExternalASTSource::Deserializing::~Deserializing() /usr/src/debug/clang/clang-18.1.8.src/include/clang/AST/ExternalASTSource.h:86:36
#15 0x00007c79b78ade9e clang::ASTReader::FindExternalVisibleDeclsByName(clang::DeclContext const*, clang::DeclarationName) /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReader.cpp:7981:1
#16 0x00007c79b6298853 clang::DeclContext::lookup(clang::DeclarationName) const /usr/src/debug/clang/clang-18.1.8.src/lib/AST/DeclBase.cpp:1822:60
#17 0x00007c79b6c663ca LookupDirect /usr/src/debug/clang/clang-18.1.8.src/lib/Sema/SemaLookup.cpp:1124:23
#18 0x00007c79b6c698de clang::Sema::LookupQualifiedName(clang::LookupResult&, clang::DeclContext*, bool) /usr/src/debug/clang/clang-18.1.8.src/lib/Sema/SemaLookup.cpp:2448:3
#19 0x00007c79b6a4823e clang::Sema::ActOnStartNamespaceDef(clang::Scope*, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributesView const&, clang::UsingDirectiveDecl*&, bool) /usr/src/debug/clang/clang-18.1.8.src/lib/Sema/SemaDeclCXX.cpp:11658:28
#20 0x00007c79b5fbc4f0 clang::PrettyDeclStackTraceEntry::PrettyDeclStackTraceEntry(clang::ASTContext&, clang::Decl*, clang::SourceLocation, char const*) /usr/src/debug/clang/clang-18.1.8.src/include/clang/AST/PrettyDeclStackTrace.h:38:54
#21 0x00007c79b5fbc4f0 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDeclCXX.cpp:236:72
#22 0x00007c79b5fdd00f clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDecl.cpp:1928:0
#23 0x00007c79b60694cb clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/Parser.cpp:1018:32
#24 0x00007c79b5fbb3ff clang::AttributePool::~AttributePool() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Sema/ParsedAttr.h:705:41
#25 0x00007c79b5fbb3ff clang::ParsedAttributes::~ParsedAttributes() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Sema/ParsedAttr.h:935:7
#26 0x00007c79b5fbb3ff clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDeclCXX.cpp:264:5
#27 0x00007c79b5fbc579 clang::Parser::ParseScope::Exit() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Parse/Parser.h:1161:24
#28 0x00007c79b5fbc579 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDeclCXX.cpp:243:22
#29 0x00007c79b5fdd10c clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDecl.cpp:1940:0
#30 0x00007c79b60694cb clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/Parser.cpp:1018:32
#31 0x00007c79b606a06b clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/Parser.cpp:760:36
#32 0x00007c79b5f8cfb8 clang::ParseAST(clang::Sema&, bool, bool) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseAST.cpp:162:69
#33 0x00007c79b7a583d1 clang::FrontendAction::Execute() /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/FrontendAction.cpp:1069:21
#34 0x00007c79b79f9017 llvm::Error::getPtr() const /usr/include/llvm/Support/Error.h:279:0
#35 0x00007c79b79f9017 llvm::Error::operator bool() /usr/include/llvm/Support/Error.h:239:0
#36 0x00007c79b79f9017 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/CompilerInstance.cpp:1057:0
#37 0x00007c79b79f9549 clang::FrontendAction::~FrontendAction() /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/FrontendAction.cpp:149:0
#38 0x00007c79b79f9549 clang::ASTFrontendAction::~ASTFrontendAction() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Frontend/FrontendAction.h:243:0
#39 0x00007c79b79f9549 clang::GenerateModuleAction::~GenerateModuleAction() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Frontend/FrontendActions.h:116:0
#40 0x00007c79b79f9549 clang::GenerateModuleFromModuleMapAction::~GenerateModuleFromModuleMapAction() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Frontend/FrontendActions.h:142:0
#41 0x00007c79b79f9549 operator() /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/CompilerInstance.cpp:1278:0
#42 0x00007c79b79f9549 callback_fn<compileModuleImpl(clang::CompilerInstance&, clang::SourceLocation, llvm::StringRef, clang::FrontendInputFile, llvm::StringRef, llvm::StringRef, llvm::function_ref<void(clang::CompilerInstance&)>, llvm::function_ref<void(clang::CompilerInstance&)>)::<lambda()> > /usr/include/llvm/ADT/STLFunctionalExtras.h:45:0
#43 0x00007c79adea8d3a llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib/libLLVM.so.18.1+0x6a8d3a)
#44 0x00007c79adea8df0 (/usr/lib/libLLVM.so.18.1+0x6a8df0)
#45 0x00007c79adea87ab (/usr/lib/libLLVM.so.18.1+0x6a87ab)
#46 0x00007c79ad2a339d (/usr/lib/libc.so.6+0x9439d)
#47 0x00007c79ad32849c (/usr/lib/libc.so.6+0x11949c)
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 18.1.8
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/test-a7e820.cpp
clang: note: diagnostic msg: /tmp/test-a7e820.cache
clang: note: diagnostic msg: /tmp/test-a7e820.sh
clang: note: diagnostic msg: 

********************

[philnik777]

Could you provide the files listed at the bottom?

[llvmbot]

@llvm/issue-subscribers-clang-modules

Author: zyp2005 (zyp2005)

``` PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script. Stack dump: 0. /usr/bin/../include/c++/v1/__system_error/error_condition.h:28:1: current parser token 'template' 1. /usr/bin/../include/c++/v1/__system_error/error_condition.h:26:1 <Spelling=/usr/bin/../include/c++/v1/__config:884:39>: parsing namespace 'std' #0 0x00007c79adfc4d90 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/libLLVM.so.18.1+0x7c4d90) #1 0x00007c79adfc1d4d (/usr/lib/libLLVM.so.18.1+0x7c1d4d) #2 0x00007c79ad24c1d0 (/usr/lib/libc.so.6+0x3d1d0) #3 0x00007c79b7886ed8 llvm::SmallVectorBase<unsigned int>::size() const /usr/include/llvm/ADT/SmallVector.h:91:32 #4 0x00007c79b7886ed8 llvm::SmallVectorTemplateCommon<std::pair<clang::Decl*, clang::FunctionDecl*>, void>::end() /usr/include/llvm/ADT/SmallVector.h:282:41 #5 0x00007c79b7886ed8 llvm::SmallVectorTemplateBase<std::pair<clang::Decl*, clang::FunctionDecl*>, true>::push_back(std::pair<clang::Decl*, clang::FunctionDecl*>) /usr/include/llvm/ADT/SmallVector.h:576:46 #6 0x00007c79b7886ed8 std::pair<clang::Decl*, clang::FunctionDecl*>& llvm::SmallVectorTemplateBase<std::pair<clang::Decl*, clang::FunctionDecl*>, true>::growAndEmplaceBack<std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>, std::tuple<clang::FunctionDecl*&&>>(std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>&&, std::tuple<clang::FunctionDecl*&&>&&) /usr/include/llvm/ADT/SmallVector.h:569:14 #7 0x00007c79b7886ed8 std::pair<clang::Decl*, clang::FunctionDecl*>& llvm::SmallVectorImpl<std::pair<clang::Decl*, clang::FunctionDecl*>>::emplace_back<std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>, std::tuple<clang::FunctionDecl*&&>>(std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>&&, std::tuple<clang::FunctionDecl*&&>&&) /usr/include/llvm/ADT/SmallVector.h:952:38 #8 0x00007c79b7886ed8 std::pair<clang::Decl*, clang::FunctionDecl*>& llvm::SmallVectorImpl<std::pair<clang::Decl*, clang::FunctionDecl*>>::emplace_back<std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>, std::tuple<clang::FunctionDecl*&&>>(std::piecewise_construct_t const&, std::tuple<clang::Decl*&&>&&, std::tuple<clang::FunctionDecl*&&>&&) /usr/include/llvm/ADT/SmallVector.h:950:0 #9 0x00007c79b7886ed8 std::pair<std::pair<clang::Decl*, clang::FunctionDecl*>*, bool> llvm::MapVector<clang::Decl*, clang::FunctionDecl*, llvm::SmallDenseMap<clang::Decl*, unsigned int, 4u, llvm::DenseMapInfo<clang::Decl*, void>, llvm::detail::DenseMapPair<clang::Decl*, unsigned int>>, llvm::SmallVector<std::pair<clang::Decl*, clang::FunctionDecl*>, 4u>>::try_emplace<clang::FunctionDecl*>(clang::Decl*&&, clang::FunctionDecl*&&) /usr/include/llvm/ADT/MapVector.h:133:26 #10 0x00007c79b7886ed8 llvm::MapVector<clang::Decl*, clang::FunctionDecl*, llvm::SmallDenseMap<clang::Decl*, unsigned int, 4u, llvm::DenseMapInfo<clang::Decl*, void>, llvm::detail::DenseMapPair<clang::Decl*, unsigned int>>, llvm::SmallVector<std::pair<clang::Decl*, clang::FunctionDecl*>, 4u>>::insert(std::pair<clang::Decl*, clang::FunctionDecl*>&&) /usr/include/llvm/ADT/MapVector.h:145:23 #11 0x00007c79b7886ed8 void clang::ASTDeclReader::attachPreviousDeclImpl<clang::FunctionDecl>(clang::ASTReader&, clang::Redeclarable<clang::FunctionDecl>*, clang::Decl*, clang::Decl*) /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReaderDecl.cpp:3660:48 #12 0x00007c79b78a2b71 clang::ASTReader::finishPendingActions() /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReader.cpp:9571:28 #13 0x00007c79b78ade9e clang::ASTReader::FinishedDeserializing() /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReader.cpp:10090:3 #14 0x00007c79b78ade9e clang::ExternalASTSource::Deserializing::~Deserializing() /usr/src/debug/clang/clang-18.1.8.src/include/clang/AST/ExternalASTSource.h:86:36 #15 0x00007c79b78ade9e clang::ASTReader::FindExternalVisibleDeclsByName(clang::DeclContext const*, clang::DeclarationName) /usr/src/debug/clang/clang-18.1.8.src/lib/Serialization/ASTReader.cpp:7981:1 #16 0x00007c79b6298853 clang::DeclContext::lookup(clang::DeclarationName) const /usr/src/debug/clang/clang-18.1.8.src/lib/AST/DeclBase.cpp:1822:60 #17 0x00007c79b6c663ca LookupDirect /usr/src/debug/clang/clang-18.1.8.src/lib/Sema/SemaLookup.cpp:1124:23 #18 0x00007c79b6c698de clang::Sema::LookupQualifiedName(clang::LookupResult&, clang::DeclContext*, bool) /usr/src/debug/clang/clang-18.1.8.src/lib/Sema/SemaLookup.cpp:2448:3 #19 0x00007c79b6a4823e clang::Sema::ActOnStartNamespaceDef(clang::Scope*, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributesView const&, clang::UsingDirectiveDecl*&, bool) /usr/src/debug/clang/clang-18.1.8.src/lib/Sema/SemaDeclCXX.cpp:11658:28 #20 0x00007c79b5fbc4f0 clang::PrettyDeclStackTraceEntry::PrettyDeclStackTraceEntry(clang::ASTContext&, clang::Decl*, clang::SourceLocation, char const*) /usr/src/debug/clang/clang-18.1.8.src/include/clang/AST/PrettyDeclStackTrace.h:38:54 #21 0x00007c79b5fbc4f0 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDeclCXX.cpp:236:72 #22 0x00007c79b5fdd00f clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDecl.cpp:1928:0 #23 0x00007c79b60694cb clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/Parser.cpp:1018:32 #24 0x00007c79b5fbb3ff clang::AttributePool::~AttributePool() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Sema/ParsedAttr.h:705:41 #25 0x00007c79b5fbb3ff clang::ParsedAttributes::~ParsedAttributes() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Sema/ParsedAttr.h:935:7 #26 0x00007c79b5fbb3ff clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDeclCXX.cpp:264:5 #27 0x00007c79b5fbc579 clang::Parser::ParseScope::Exit() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Parse/Parser.h:1161:24 #28 0x00007c79b5fbc579 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDeclCXX.cpp:243:22 #29 0x00007c79b5fdd10c clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseDecl.cpp:1940:0 #30 0x00007c79b60694cb clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/Parser.cpp:1018:32 #31 0x00007c79b606a06b clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/Parser.cpp:760:36 #32 0x00007c79b5f8cfb8 clang::ParseAST(clang::Sema&, bool, bool) /usr/src/debug/clang/clang-18.1.8.src/lib/Parse/ParseAST.cpp:162:69 #33 0x00007c79b7a583d1 clang::FrontendAction::Execute() /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/FrontendAction.cpp:1069:21 #34 0x00007c79b79f9017 llvm::Error::getPtr() const /usr/include/llvm/Support/Error.h:279:0 #35 0x00007c79b79f9017 llvm::Error::operator bool() /usr/include/llvm/Support/Error.h:239:0 #36 0x00007c79b79f9017 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/CompilerInstance.cpp:1057:0 #37 0x00007c79b79f9549 clang::FrontendAction::~FrontendAction() /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/FrontendAction.cpp:149:0 #38 0x00007c79b79f9549 clang::ASTFrontendAction::~ASTFrontendAction() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Frontend/FrontendAction.h:243:0 #39 0x00007c79b79f9549 clang::GenerateModuleAction::~GenerateModuleAction() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Frontend/FrontendActions.h:116:0 #40 0x00007c79b79f9549 clang::GenerateModuleFromModuleMapAction::~GenerateModuleFromModuleMapAction() /usr/src/debug/clang/clang-18.1.8.src/include/clang/Frontend/FrontendActions.h:142:0 #41 0x00007c79b79f9549 operator() /usr/src/debug/clang/clang-18.1.8.src/lib/Frontend/CompilerInstance.cpp:1278:0 #42 0x00007c79b79f9549 callback_fn<compileModuleImpl(clang::CompilerInstance&, clang::SourceLocation, llvm::StringRef, clang::FrontendInputFile, llvm::StringRef, llvm::StringRef, llvm::function_ref<void(clang::CompilerInstance&)>, llvm::function_ref<void(clang::CompilerInstance&)>)::<lambda()> > /usr/include/llvm/ADT/STLFunctionalExtras.h:45:0 #43 0x00007c79adea8d3a llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib/libLLVM.so.18.1+0x6a8d3a) #44 0x00007c79adea8df0 (/usr/lib/libLLVM.so.18.1+0x6a8df0) #45 0x00007c79adea87ab (/usr/lib/libLLVM.so.18.1+0x6a87ab) #46 0x00007c79ad2a339d (/usr/lib/libc.so.6+0x9439d) #47 0x00007c79ad32849c (/usr/lib/libc.so.6+0x11949c) clang: error: unable to execute command: Segmentation fault (core dumped) clang: error: clang frontend command failed due to signal (use -v to see invocation) clang version 18.1.8 Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin clang: note: diagnostic msg: ********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/test-a7e820.cpp
clang: note: diagnostic msg: /tmp/test-a7e820.cache
clang: note: diagnostic msg: /tmp/test-a7e820.sh
clang: note: diagnostic msg:

---

</details>

[zyp2005]

Here are the preprocessed source

# 1 "test.cpp"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 469 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "test.cpp" 2
import std;

using namespace std;
int main() {

  std::cout << "Hello, Would!\n";

  return 0;
}

[zyp2005]

I use clang -std=c++23 -fmodules -stdlib=libc++ test.cpp to compile

[ChuanqiXu9]

-fmodules is not intented to use standard named modules but clang header modules. Please see https://libcxx.llvm.org/Modules.html

But crash is always a bug. So this issue report is valid.

[Iritscen]

Not sure if I should make a new ticket, but I have also been crashing today from improperly placing the -fmodules argument in a clang++ invocation. This crash does not occur in release builds, so it seems like the bug above has been fixed, but I built clang with assertions enabled and it is hitting an assert over this. Does that still count as undesirable behavior?

I was working with a .cppm file which has these contents:

module;
#include <string_view>
export module hello;

export namespace hello
{
  void say_hello (std::string_view name);
}

The error is Assertion failed: (ThisModule && "was expecting a module if building one"), function BuildModuleInclude, file SemaModule.cpp, line 769. and the stack trace is:

Stack dump:
0.	Program arguments: /path/to/llvm-project/bin/clang++ -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -std=c++20 -fmodules -Xclang -emit-module-interface -x c++ -c hello-int.cppm -o hello_int.o
1.	hello-int.cppm:3:1: at annotation token
 #0 0x00000001070f7254 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/path/to/llvm-project/bin/clang-21+0x10289f254)
 #1 0x00000001070f5358 llvm::sys::RunSignalHandlers() (/path/to/llvm-project/bin/clang-21+0x10289d358)
 #2 0x00000001070f6828 llvm::sys::CleanupOnSignal(unsigned long) (/path/to/llvm-project/bin/clang-21+0x10289e828)
 #3 0x000000010704e7a4 CrashRecoverySignalHandler(int) (/path/to/llvm-project/bin/clang-21+0x1027f67a4)
 #4 0x0000000183d1c624 (/usr/lib/system/libsystem_platform.dylib+0x1804ac624)
 #5 0x0000000183ce288c (/usr/lib/system/libsystem_pthread.dylib+0x18047288c)
 #6 0x0000000183bebc60 (/usr/lib/system/libsystem_c.dylib+0x18037bc60)
 #7 0x0000000183beaeec (/usr/lib/system/libsystem_c.dylib+0x18037aeec)
 #8 0x0000000109d5ca44 clang::Sema::ActOnAnnotModuleEnd(clang::SourceLocation, clang::Module*) (.cold.5) (/path/to/llvm-project/bin/clang-21+0x105504a44)
 #9 0x0000000108c71f0c clang::Sema::ActOnAnnotModuleBegin(clang::SourceLocation, clang::Module*) (/path/to/llvm-project/bin/clang-21+0x104419f0c)
#10 0x00000001088704a0 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/path/to/llvm-project/bin/clang-21+0x1040184a0)
#11 0x000000010878281c clang::ParseAST(clang::Sema&, bool, bool) (/path/to/llvm-project/bin/clang-21+0x103f2a81c)
#12 0x0000000107c26bcc clang::FrontendAction::Execute() (/path/to/llvm-project/bin/clang-21+0x1033cebcc)
#13 0x0000000107bb6a44 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/path/to/llvm-project/bin/clang-21+0x10335ea44)
#14 0x0000000107ca0b60 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/path/to/llvm-project/bin/clang-21+0x103448b60)
#15 0x000000010485dd30 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/path/to/llvm-project/bin/clang-21+0x100005d30)
#16 0x000000010485bd64 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) (/path/to/llvm-project/bin/clang-21+0x100003d64)
#17 0x0000000107a131f4 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__1::optional<llvm::StringRef>>, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>*, bool*) const::$_0>(long) (/path/to/llvm-project/bin/clang-21+0x1031bb1f4)
#18 0x000000010704e4b4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/path/to/llvm-project/bin/clang-21+0x1027f64b4)
#19 0x0000000107a12c68 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__1::optional<llvm::StringRef>>, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>*, bool*) const (/path/to/llvm-project/bin/clang-21+0x1031bac68)
#20 0x00000001079dd5d4 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/path/to/llvm-project/bin/clang-21+0x1031855d4)
#21 0x00000001079dd7dc clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*>>&, bool) const (/path/to/llvm-project/bin/clang-21+0x1031857dc)
#22 0x00000001079f821c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*>>&) (/path/to/llvm-project/bin/clang-21+0x1031a021c)
#23 0x000000010485ae4c clang_main(int, char**, llvm::ToolContext const&) (/path/to/llvm-project/bin/clang-21+0x100002e4c)
#24 0x0000000104867e10 main (/path/to/llvm-project/bin/clang-21+0x10000fe10)
#25 0x0000000183942b98