clang: assertion `D.getASTContext().getLangOpts().CPlusPlus` failed

[llvmbot]

Bugzilla Link	49235
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@zygoloid

Extended Description

It may be duplicated with #44103 .

$ cat test.c
int main() {
struct {
int x attribute((aligned(({ a(); }))));
} x;
}

$ ./clang -c test.c
test.c:3:41: warning: implicit declaration of function 'a' is invalid in C99 [-Wimplicit-function-declaration]
int x attribute((aligned(({ a(); }))));
^
clang: /home/xxx/data/git/llvm-project/clang/lib/AST/Decl.cpp:2052: bool isDeclExternC(const T &) [T = clang::FunctionDecl]: Assertion `D.getASTContext().getLangOpts().CPlusPlus' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /data/xxx/git/llvm-project/build/bin/clang -c test.c

1.  test.c:3:41: current parser token 'a'
   

2.  test.c:1:12: parsing function body 'main'
   

3.  test.c:1:12: in compound statement ('{}')
   

4.  test.c:2:5: parsing struct/union body ''
   

5.  test.c:3:39: in compound statement ('{}')
   

#​0 0x0000000006e97306 llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/xxx/data/git/llvm-project/llvm/lib/Support/Unix/Signals.inc:560:7
#​1 0x0000000006e9266e llvm::sys::RunSignalHandlers() /home/xxx/data/git/llvm-project/llvm/lib/Support/Signals.cpp:69:18
#​2 0x0000000006e95560 llvm::sys::CleanupOnSignal(unsigned long) /home/xxx/data/git/llvm-project/llvm/lib/Support/Unix/Signals.inc:361:3
#​3 0x0000000006c878a5 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) /home/xxx/data/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:77:5
#​4 0x0000000006c87d20 CrashRecoverySignalHandler(int) /home/xxx/data/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:383:1
#​5 0x00007f9ac4c598a0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
#​6 0x00007f9ac391ff47 gsignal /build/glibc-2ORdQG/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#​7 0x00007f9ac39218b1 abort /build/glibc-2ORdQG/glibc-2.27/stdlib/abort.c:81:0
#​8 0x00007f9ac391142a __assert_fail_base /build/glibc-2ORdQG/glibc-2.27/assert/assert.c:89:0
#​9 0x00007f9ac39114a2 (/lib/x86_64-linux-gnu/libc.so.6+0x304a2)
#​10 0x000000000f31cab6 /home/xxx/data/git/llvm-project/clang/lib/AST/Decl.cpp:2052:5
#​11 0x000000000cee82c2 bool isIncompleteDeclExternCclang::FunctionDecl(clang::Sema&, clang::FunctionDecl const*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:6602:13
#​12 0x000000000cebca55 clang::Sema::ActOnFunctionDeclarator(clang::Scope*, clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*, clang::LookupResult&, llvm::MutableArrayRefclang::TemplateParameterList*, bool&) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:9700:7
#​13 0x000000000ceaca94 clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRefclang::TemplateParameterList*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:5868:11
#​14 0x000000000ceaa141 clang::Sema::ActOnDeclarator(clang::Scope*, clang::Declarator&) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:5544:15
#​15 0x000000000ce69606 clang::Sema::ImplicitlyDefineFunction(clang::SourceLocation, clang::IdentifierInfo&, clang::Scope*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:14661:41
#​16 0x000000000ce64a09 clang::Sema::ClassifyName(clang::Scope*, clang::CXXScopeSpec&, clang::IdentifierInfo*&, clang::SourceLocation, clang::Token const&, clang::CorrectionCandidateCallback*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:929:26
#​17 0x000000000c8369ed clang::Parser::TryAnnotateName(clang::CorrectionCandidateCallback*) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:1627:53
#​18 0x000000000ca0874b clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:191:11
#​19 0x000000000ca081a6 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:106:20
#​20 0x000000000ca1c77e clang::Parser::ParseCompoundStatementBody(bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:1089:11
#​21 0x000000000ca1a464 clang::Parser::ParseScope::~ParseScope() /home/xxx/data/git/llvm-project/clang/include/clang/Parse/Parser.h:0:0
#​22 0x000000000ca1a464 clang::Parser::ParseCompoundStatement(bool, unsigned int) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:904:0
#​23 0x000000000c91556d clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool, bool, clang::OpaquePtrclang::QualType&, clang::SourceLocation&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:2872:16
#​24 0x000000000c90fc2e clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:957:11
#​25 0x000000000c902c60 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:681:20
#​26 0x000000000c8fe5ef clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:176:10
#​27 0x000000000c8627aa _ZN4llvm12function_refIFN5clang12ActionResultIPNS1_4ExprELb1EEES4_EEC2IZNS1_4Sema25CorrectDelayedTyposInExprES5_PNS1_7VarDeclEbS7_Ed_UlS4_E_EEOT_PNSt9enable_ifIXntsr3std7is_sameINSt9remove_cvINSt16remove_referenceISD_E4typeEE4typeES7_EE5valueEvE4typeE /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:0:0
#​28 0x000000000c8627aa clang::Parser::ParseAttributeArgsCommon(clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributes&, clang::SourceLocation*, clang::IdentifierInfo*, clang::SourceLocation, clang::AttributeCommonInfo::Syntax) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:397:0
#​29 0x000000000c86049b clang::Parser::ParseGNUAttributeArgs(clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributes&, clang::SourceLocation*, clang::IdentifierInfo*, clang::SourceLocation, clang::AttributeCommonInfo::Syntax, clang::Declarator*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:480:3
#​30 0x000000000c85ed4a clang::Parser::ParseGNUAttributes(clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::LateParsedAttrList*, clang::Declarator*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:189:9
#​31 0x000000000c84163e clang::Parser::MaybeParseGNUAttributes(clang::Declarator&, clang::Parser::LateParsedAttrList*) /home/xxx/data/git/llvm-project/clang/include/clang/Parse/Parser.h:2650:31
#​32 0x000000000c89229a llvm::function_ref<void (clang::ParsingFieldDeclarator&)>::operator()(clang::ParsingFieldDeclarator&) const /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:0:0
#​33 0x000000000c89229a clang::Parser::ParseStructDeclaration(clang::ParsingDeclSpec&, llvm::function_ref<void (clang::ParsingFieldDeclarator&)>) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:4088:0
#​34 0x000000000c89354a clang::ParsingDeclSpec::~ParsingDeclSpec() /home/xxx/data/git/llvm-project/clang/include/clang/Parse/RAIIObjectsForParser.h:0:0
#​35 0x000000000c89354a clang::Parser::ParseStructUnionBody(clang::SourceLocation, clang::TypeSpecifierType, clang::RecordDecl*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:4179:0
#​36 0x000000000c8d1a67 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::Parser::ParsedAttributesWithRange&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:1969:20
#​37 0x000000000c8744f9 clang::ParsedAttributesView::empty() const /home/xxx/data/git/llvm-project/clang/include/clang/Sema/ParsedAttr.h:0:0
#​38 0x000000000c8744f9 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:3839:0
#​39 0x000000000c8735e7 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1675:10
#​40 0x000000000c873179 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:0:12
#​41 0x000000000ca08d41 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:0:13
#​42 0x000000000ca081a6 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:106:20
#​43 0x000000000ca1c77e clang::Parser::ParseCompoundStatementBody(bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:1089:11
#​44 0x000000000ca1f748 clang::ActionResult<clang::Stmt*, true>::isInvalid() const /home/xxx/data/git/llvm-project/clang/include/clang/Sema/Ownership.h:0:0
#​45 0x000000000ca1f748 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:2240:0
#​46 0x000000000c833117 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:1339:10
#​47 0x000000000c88224e clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1926:18
#​48 0x000000000c83020d clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:0:10
#​49 0x000000000c82e939 clang::Parser::ObjCDeclContextSwitch::~ObjCDeclContextSwitch() /home/xxx/data/git/llvm-project/clang/include/clang/Parse/Parser.h:0:0
#​50 0x000000000c82e939 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:1116:0
#​51 0x000000000c82c6a1 clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:935:12
#​52 0x000000000c827ecc clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&, bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:683:10
#​53 0x000000000c826ccc clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:555:26
#​54 0x000000000c81cf4a clang::ParseAST(clang::Sema&, bool, bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseAST.cpp:157:15
#​55 0x000000000861c2a2 clang::ASTFrontendAction::ExecuteAction() /home/xxx/data/git/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1059:1
#​56 0x00000000099decd8 clang::CodeGenAction::ExecuteAction() /home/xxx/data/git/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:1184:28
#​57 0x000000000861a51a clang::FrontendAction::Execute() /home/xxx/data/git/llvm-project/clang/lib/Frontend/FrontendAction.cpp:954:10
#​58 0x000000000854eaa7 llvm::Error::operator bool() /home/xxx/data/git/llvm-project/llvm/include/llvm/Support/Error.h:0:0
#​59 0x000000000854eaa7 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /home/xxx/data/git/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:984:0
#​60 0x00000000088f183f clang::CompilerInstance::getFrontendOpts() /home/xxx/data/git/llvm-project/clang/include/clang/Frontend/CompilerInstance.h:0:0
#​61 0x00000000088f183f clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /home/xxx/data/git/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:279:0
#​62 0x0000000000b094cc llvm::TimeTraceScope::~TimeTraceScope() /home/xxx/data/git/llvm-project/llvm/include/llvm/Support/TimeProfiler.h:0:0
#​63 0x0000000000b094cc cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /home/xxx/data/git/llvm-project/clang/tools/driver/cc1_main.cpp:241:0
#​64 0x0000000000afaf3b ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) /home/xxx/data/git/llvm-project/clang/tools/driver/driver.cpp:330:12
#​65 0x00000000082c1350 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const::$_1::operator()() const /home/xxx/data/git/llvm-project/clang/lib/Driver/Job.cpp:400:30
#​66 0x00000000082c1350 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const::$_1>(long) /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:185:0
#​67 0x0000000006c8767d llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) /home/xxx/data/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:420:1
#​68 0x00000000082bfbe7 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const /home/xxx/data/git/llvm-project/clang/lib/Driver/Job.cpp:400:12
#​69 0x000000000822acca std::__cxx11::basic_string<char, std::char_traits, std::allocator >::empty() const /usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/basic_string.h:0:0
#​70 0x000000000822acca clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const /home/xxx/data/git/llvm-project/clang/lib/Driver/Compilation.cpp:196:0
#​71 0x000000000822b754 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const /home/xxx/data/git/llvm-project/clang/lib/Driver/Compilation.cpp:246:19
#​72 0x0000000008266f77 llvm::SmallVectorBase::empty() const /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/SmallVector.h:0:0
#​73 0x0000000008266f77 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) /home/xxx/data/git/llvm-project/clang/lib/Driver/Driver.cpp:1509:0
#​74 0x0000000000af95ae main /home/xxx/data/git/llvm-project/clang/tools/driver/driver.cpp:502:21
#​75 0x00007f9ac3902b97 __libc_start_main /build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:344:0
#​76 0x0000000000af38ea _start (/data/xxx/git/llvm-project/build/bin/clang+0xaf38ea)
clang-11: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 11.1.0 (https://github.com/llvm/llvm-project.git 1fdec59)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /data/xxx/git/llvm-project/build/bin
clang-11: note: diagnostic msg:

---

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-11: note: diagnostic msg: /tmp/test-397fa0.c
clang-11: note: diagnostic msg: /tmp/test-397fa0.sh
clang-11: note: diagnostic msg:

---

[llvmbot]

Also affects trunk.

[llvmbot]

Assertion fails on trunk as well.

poc.c:3:41: warning: implicit declaration of function 'a' is invalid in C99 [-Wimplicit-function-declaration]
int x attribute((aligned(({ a(); }))));
^
clang: /data/xxx/git/llvm-project/clang/lib/AST/Decl.cpp:2077: bool isDeclExternC(const T &) [T = clang::FunctionDecl]: Assertion `D.getASTContext().getLangOpts().CPlusPlus' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /data/xxx/git/llvm-project/build_12/bin/clang -x c -c poc.c

1.  poc.c:3:41: current parser token 'a'
   

2.  poc.c:1:12: parsing function body 'main'
   

3.  poc.c:1:12: in compound statement ('{}')
   

4.  poc.c:2:5: parsing struct/union body ''
   

5.  poc.c:3:39: in compound statement ('{}')
   

#​0 0x0000000000d89891 __interceptor_backtrace.part.117 (/data/xxx/git/llvm-project/build_12/bin/clang+0xd89891)
#​1 0x000000000d59d8da llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /data/xxx/git/llvm-project/llvm/lib/Support/Unix/Signals.inc:561:7
#​2 0x000000000d594061 llvm::sys::RunSignalHandlers() /data/xxx/git/llvm-project/llvm/lib/Support/Signals.cpp:72:18
#​3 0x000000000d59a4ff llvm::sys::CleanupOnSignal(unsigned long) /data/xxx/git/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
#​4 0x000000000d2b2385 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) /data/xxx/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:75:5
#​5 0x000000000d2b2e4c CrashRecoverySignalHandler(int) /data/xxx/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:389:1
#​6 0x00007fc41c8cd8a0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
#​7 0x00007fc41c2f0f47 raise /build/glibc-2ORdQG/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#​8 0x00007fc41c2f28b1 abort /build/glibc-2ORdQG/glibc-2.27/stdlib/abort.c:81:0
#​9 0x00007fc41c2e242a __assert_fail_base /build/glibc-2ORdQG/glibc-2.27/assert/assert.c:89:0
#​10 0x00007fc41c2e24a2 (/lib/x86_64-linux-gnu/libc.so.6+0x304a2)
#​11 0x000000001d00df7e /data/xxx/git/llvm-project/clang/lib/AST/Decl.cpp:2077:5
#​12 0x0000000018ba57b5 bool isIncompleteDeclExternCclang::FunctionDecl(clang::Sema&, clang::FunctionDecl const*) /data/xxx/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:6653:13
#​13 0x0000000018b55bd5 clang::Sema::ActOnFunctionDeclarator(clang::Scope*, clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*, clang::LookupResult&, llvm::MutableArrayRefclang::TemplateParameterList*, bool&) /data/xxx/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:9773:7
#​14 0x0000000018b3c18c clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRefclang::TemplateParameterList*) /data/xxx/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:5880:11
#​15 0x0000000018b376db clang::Sema::ActOnDeclarator(clang::Scope*, clang::Declarator&) /data/xxx/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:5556:15
#​16 0x0000000018ac688c clang::Sema::ImplicitlyDefineFunction(clang::SourceLocation, clang::IdentifierInfo&, clang::Scope*) /data/xxx/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:14782:41
#​17 0x0000000018abe297 clang::Sema::ClassifyName(clang::Scope*, clang::CXXScopeSpec&, clang::IdentifierInfo*&, clang::SourceLocation, clang::Token const&, clang::CorrectionCandidateCallback*) /data/xxx/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:927:26
#​18 0x0000000017f7d855 clang::Parser::TryAnnotateName(clang::CorrectionCandidateCallback*) /data/xxx/git/llvm-project/clang/lib/Parse/Parser.cpp:1662:53
#​19 0x0000000018293350 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:191:11
#​20 0x000000001829089a clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:106:20
#​21 0x00000000182af9e5 clang::Parser::ParseCompoundStatementBody(bool) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:1099:11
#​22 0x00000000182ac433 clang::Parser::ParseScope::~ParseScope() /data/xxx/git/llvm-project/clang/include/clang/Parse/Parser.h:0:0
#​23 0x00000000182ac433 clang::Parser::ParseCompoundStatement(bool, unsigned int) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:910:0
#​24 0x00000000180ed4ef clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool, bool, clang::OpaquePtrclang::QualType&, clang::SourceLocation&) /data/xxx/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:2827:23
#​25 0x00000000180e5742 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:957:11
#​26 0x00000000180c5564 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:681:20
#​27 0x00000000180c5564 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) /data/xxx/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:173:0
#​28 0x0000000017fc7be6 clang::Parser::ParseAttributeArgsCommon(clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributes&, clang::SourceLocation*, clang::IdentifierInfo*, clang::SourceLocation, clang::AttributeCommonInfo::Syntax) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:398:47
#​29 0x0000000017fc48b5 clang::Parser::ParseGNUAttributeArgs(clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributes&, clang::SourceLocation*, clang::IdentifierInfo*, clang::SourceLocation, clang::AttributeCommonInfo::Syntax, clang::Declarator*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:485:3
#​30 0x0000000017fc1e73 clang::Parser::ParseGNUAttributes(clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::LateParsedAttrList*, clang::Declarator*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:190:9
#​31 0x0000000017f913c3 clang::Parser::MaybeParseGNUAttributes(clang::Declarator&, clang::Parser::LateParsedAttrList*) /data/xxx/git/llvm-project/clang/include/clang/Parse/Parser.h:2665:31
#​32 0x000000001801341e llvm::function_ref<void (clang::ParsingFieldDeclarator&)>::operator()(clang::ParsingFieldDeclarator&) const /data/xxx/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:0:0
#​33 0x000000001801341e clang::Parser::ParseStructDeclaration(clang::ParsingDeclSpec&, llvm::function_ref<void (clang::ParsingFieldDeclarator&)>) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:4173:0
#​34 0x000000001801575f clang::ParsingDeclSpec::~ParsingDeclSpec() /data/xxx/git/llvm-project/clang/include/clang/Parse/RAIIObjectsForParser.h:0:0
#​35 0x000000001801575f clang::Parser::ParseStructUnionBody(clang::SourceLocation, clang::TypeSpecifierType, clang::RecordDecl*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:4264:0
#​36 0x000000001807c2cb clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::Parser::ParsedAttributesWithRange&) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:1976:20
#​37 0x0000000017fe2f27 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:3914:7
#​38 0x0000000017fe0e49 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1725:3
#​39 0x0000000017fe043f clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, clang::SourceLocation*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1687:12
#​40 0x0000000018293d42 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:0:16
#​41 0x000000001829089a clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:106:20
#​42 0x00000000182af9e5 clang::Parser::ParseCompoundStatementBody(bool) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:1099:11
#​43 0x00000000182b580f clang::ActionResult<clang::Stmt*, true>::isInvalid() const /data/xxx/git/llvm-project/clang/include/clang/Sema/Ownership.h:0:0
#​44 0x00000000182b580f clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) /data/xxx/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:2263:0
#​45 0x0000000017f77add clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) /data/xxx/git/llvm-project/clang/lib/Parse/Parser.cpp:0:10
#​46 0x0000000017ff6aa0 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) /data/xxx/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1976:27
#​47 0x0000000017f737b2 clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) /data/xxx/git/llvm-project/clang/lib/Parse/Parser.cpp:1134:10
#​48 0x0000000017f705d7 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) /data/xxx/git/llvm-project/clang/lib/Parse/Parser.cpp:1150:12
#​49 0x0000000017f6d3ad clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) /data/xxx/git/llvm-project/clang/lib/Parse/Parser.cpp:0:12
#​50 0x0000000017f662ee clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&, bool) /data/xxx/git/llvm-project/clang/lib/Parse/Parser.cpp:716:10
#​51 0x0000000017f647c8 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&) /data/xxx/git/llvm-project/clang/lib/Parse/Parser.cpp:588:26
#​52 0x0000000017f529ab clang::ParseAST(clang::Sema&, bool, bool) /data/xxx/git/llvm-project/clang/lib/Parse/ParseAST.cpp:157:25
#​53 0x00000000102ed733 clang::ASTFrontendAction::ExecuteAction() /data/xxx/git/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1058:1
#​54 0x00000000129dd448 clang::CodeGenAction::ExecuteAction() /data/xxx/git/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:1082:30
#​55 0x00000000102ea56d clang::FrontendAction::Execute() /data/xxx/git/llvm-project/clang/lib/Frontend/FrontendAction.cpp:0:8
#​56 0x00000000100f5a87 llvm::Error::operator bool() /data/xxx/git/llvm-project/llvm/include/llvm/Support/Error.h:0:0
#​57 0x00000000100f5a87 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /data/xxx/git/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:949:0
#​58 0x00000000107e829e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /data/xxx/git/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:278:25
#​59 0x0000000000e277af cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /data/xxx/git/llvm-project/clang/tools/driver/cc1_main.cpp:240:15
#​60 0x0000000000e0f567 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) /data/xxx/git/llvm-project/clang/tools/driver/driver.cpp:330:12
#​61 0x000000000fc7c44d clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const::$_1::operator()() const /data/xxx/git/llvm-project/clang/lib/Driver/Job.cpp:404:30
#​62 0x000000000fc7c44d void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const::$_1>(long) /data/xxx/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:185:0
#​63 0x000000000d2b1f24 llvm::function_ref<void ()>::operator()() const /data/xxx/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:209:12
#​64 0x000000000d2b1f24 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) /data/xxx/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:424:0
#​65 0x000000000fc79da2 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const /data/xxx/git/llvm-project/clang/lib/Driver/Job.cpp:404:7
#​66 0x000000000fb7111e clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const /data/xxx/git/llvm-project/clang/lib/Driver/Compilation.cpp:195:15
#​67 0x000000000fb71d6c clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const /data/xxx/git/llvm-project/clang/lib/Driver/Compilation.cpp:248:19
#​68 0x000000000fbd4e2a llvm::SmallVectorBase::empty() const /data/xxx/git/llvm-project/llvm/include/llvm/ADT/SmallVector.h:0:0
#​69 0x000000000fbd4e2a clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) /data/xxx/git/llvm-project/clang/lib/Driver/Driver.cpp:1517:0
#​70 0x0000000000e0c4af main /data/xxx/git/llvm-project/clang/tools/driver/driver.cpp:502:21
#​71 0x00007fc41c2d3b97 __libc_start_main /build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:344:0
#​72 0x0000000000d072ca _start (/data/xxx/git/llvm-project/build_12/bin/clang+0xd072ca)
clang-12: error: clang frontend command failed with exit code 134 (use -v to see invocation)
clang version 12.0.0 (https://github.com/llvm/llvm-project.git b46924e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /data/xxx/git/llvm-project/build_12/bin
clang-12: note: diagnostic msg:

---

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-12: note: diagnostic msg: /tmp/poc-edc185.c
clang-12: note: diagnostic msg: /tmp/poc-edc185.sh
clang-12: note: diagnostic msg:

---

[llvmbot]

Sorry, I made a mistake of attaching the output of 12.0, instead of trunk. Following is the one of trunk.

test.c:3:41: warning: implicit declaration of function 'a' is invalid in C99 [-Wimplicit-function-declaration]
int x attribute((aligned(({ a(); }))));
^
clang: /home/xxx/data/git/llvm-project/clang/lib/AST/Decl.cpp:2077: bool isDeclExternC(const T &) [T = clang::FunctionDecl]: Assertion `D.getASTContext().getLangOpts().CPlusPlus' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /data/xxx/git/llvm-project/build_trunk/bin/clang -x c -c test.c

1.  test.c:3:41: current parser token 'a'
   

2.  test.c:1:12: parsing function body 'main'
   

3.  test.c:1:12: in compound statement ('{}')
   

4.  test.c:2:5: parsing struct/union body ''
   

5.  test.c:3:39: in compound statement ('{}')
   

#​0 0x0000000000dfd0a1 __interceptor_backtrace.part.117 asan_interceptors.cc.o:0:0
#​1 0x000000000d7fb43a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/xxx/data/git/llvm-project/llvm/lib/Support/Unix/Signals.inc:561:7
#​2 0x000000000d7f1bc1 llvm::sys::RunSignalHandlers() /home/xxx/data/git/llvm-project/llvm/lib/Support/Signals.cpp:72:18
#​3 0x000000000d7f805f llvm::sys::CleanupOnSignal(unsigned long) /home/xxx/data/git/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
#​4 0x000000000d504245 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) /home/xxx/data/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:75:5
#​5 0x000000000d504d0c CrashRecoverySignalHandler(int) /home/xxx/data/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:389:1
#​6 0x00007f35f0f918a0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
#​7 0x00007f35f09b4f47 raise /build/glibc-2ORdQG/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#​8 0x00007f35f09b68b1 abort /build/glibc-2ORdQG/glibc-2.27/stdlib/abort.c:81:0
#​9 0x00007f35f09a642a __assert_fail_base /build/glibc-2ORdQG/glibc-2.27/assert/assert.c:89:0
#​10 0x00007f35f09a64a2 (/lib/x86_64-linux-gnu/libc.so.6+0x304a2)
#​11 0x000000001d479b3e /home/xxx/data/git/llvm-project/clang/lib/AST/Decl.cpp:2077:5
#​12 0x0000000018f645b5 bool isIncompleteDeclExternCclang::FunctionDecl(clang::Sema&, clang::FunctionDecl const*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:6651:13
#​13 0x0000000018f1470f clang::Sema::ActOnFunctionDeclarator(clang::Scope*, clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*, clang::LookupResult&, llvm::MutableArrayRefclang::TemplateParameterList*, bool&) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:9777:7
#​14 0x0000000018efab1c clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRefclang::TemplateParameterList*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:5878:11
#​15 0x0000000018ef606b clang::Sema::ActOnDeclarator(clang::Scope*, clang::Declarator&) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:5554:15
#​16 0x0000000018e85409 clang::Sema::ImplicitlyDefineFunction(clang::SourceLocation, clang::IdentifierInfo&, clang::Scope*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:14786:41
#​17 0x0000000018e7ce27 clang::Sema::ClassifyName(clang::Scope*, clang::CXXScopeSpec&, clang::IdentifierInfo*&, clang::SourceLocation, clang::Token const&, clang::CorrectionCandidateCallback*) /home/xxx/data/git/llvm-project/clang/lib/Sema/SemaDecl.cpp:927:26
#​18 0x000000001832f4b5 clang::Parser::TryAnnotateName(clang::CorrectionCandidateCallback*) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:1662:53
#​19 0x00000000186466ae clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:198:11
#​20 0x0000000018643e2a clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:115:3
#​21 0x0000000018663e85 clang::Parser::ParseCompoundStatementBody(bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:1110:11
#​22 0x00000000186608d3 clang::Parser::ParseScope::~ParseScope() /home/xxx/data/git/llvm-project/clang/include/clang/Parse/Parser.h:0:0
#​23 0x00000000186608d3 clang::Parser::ParseCompoundStatement(bool, unsigned int) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:921:0
#​24 0x000000001849f7ff clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool, bool, clang::OpaquePtrclang::QualType&, clang::SourceLocation&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:2827:23
#​25 0x0000000018497a4c clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:957:11
#​26 0x0000000018477884 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:681:20
#​27 0x0000000018477884 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseExpr.cpp:173:0
#​28 0x0000000018379c06 clang::Parser::ParseAttributeArgsCommon(clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributes&, clang::SourceLocation*, clang::IdentifierInfo*, clang::SourceLocation, clang::AttributeCommonInfo::Syntax) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:416:47
#​29 0x0000000018376898 clang::Parser::ParseGNUAttributeArgs(clang::IdentifierInfo*, clang::SourceLocation, clang::ParsedAttributes&, clang::SourceLocation*, clang::IdentifierInfo*, clang::SourceLocation, clang::AttributeCommonInfo::Syntax, clang::Declarator*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:503:3
#​30 0x0000000018373e53 clang::Parser::ParseGNUAttributes(clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::LateParsedAttrList*, clang::Declarator*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:208:9
#​31 0x0000000018343073 clang::Parser::MaybeParseGNUAttributes(clang::Declarator&, clang::Parser::LateParsedAttrList*) /home/xxx/data/git/llvm-project/clang/include/clang/Parse/Parser.h:2723:31
#​32 0x00000000183c4fde llvm::function_ref<void (clang::ParsingFieldDeclarator&)>::operator()(clang::ParsingFieldDeclarator&) const /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:0:0
#​33 0x00000000183c4fde clang::Parser::ParseStructDeclaration(clang::ParsingDeclSpec&, llvm::function_ref<void (clang::ParsingFieldDeclarator&)>) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:4187:0
#​34 0x00000000183c7322 clang::ParsingDeclSpec::~ParsingDeclSpec() /home/xxx/data/git/llvm-project/clang/include/clang/Parse/RAIIObjectsForParser.h:0:0
#​35 0x00000000183c7322 clang::Parser::ParseStructUnionBody(clang::SourceLocation, clang::TypeSpecifierType, clang::RecordDecl*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:4278:0
#​36 0x000000001842e535 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::Parser::ParsedAttributesWithRange&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDeclCXX.cpp:1972:20
#​37 0x0000000018394f87 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:3929:7
#​38 0x0000000018392eac clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1743:3
#​39 0x000000001839249f clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1705:12
#​40 0x0000000018647fa8 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:0:16
#​41 0x0000000018643e2a clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:115:3
#​42 0x0000000018663e85 clang::Parser::ParseCompoundStatementBody(bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:1110:11
#​43 0x0000000018669c9f clang::ActionResult<clang::Stmt*, true>::isInvalid() const /home/xxx/data/git/llvm-project/clang/include/clang/Sema/Ownership.h:0:0
#​44 0x0000000018669c9f clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseStmt.cpp:2274:0
#​45 0x000000001832973d clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:0:10
#​46 0x00000000183a8a06 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseDecl.cpp:1994:27
#​47 0x0000000018325412 clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:1134:10
#​48 0x0000000018322237 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:1150:12
#​49 0x000000001831f00d clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:0:12
#​50 0x0000000018317f4e clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&, bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:716:10
#​51 0x0000000018316428 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&) /home/xxx/data/git/llvm-project/clang/lib/Parse/Parser.cpp:588:26
#​52 0x000000001830460b clang::ParseAST(clang::Sema&, bool, bool) /home/xxx/data/git/llvm-project/clang/lib/Parse/ParseAST.cpp:157:25
#​53 0x00000000105c90c3 clang::ASTFrontendAction::ExecuteAction() /home/xxx/data/git/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1058:1
#​54 0x0000000012cff7d9 clang::CodeGenAction::ExecuteAction() /home/xxx/data/git/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:1082:30
#​55 0x00000000105c5efd clang::FrontendAction::Execute() /home/xxx/data/git/llvm-project/clang/lib/Frontend/FrontendAction.cpp:0:8
#​56 0x0000000010394e0a llvm::Error::operator bool() /home/xxx/data/git/llvm-project/llvm/include/llvm/Support/Error.h:0:0
#​57 0x0000000010394e0a clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /home/xxx/data/git/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:949:0
#​58 0x0000000010ac5a2e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /home/xxx/data/git/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:278:25
#​59 0x0000000000e9b85d cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /home/xxx/data/git/llvm-project/clang/tools/driver/cc1_main.cpp:246:15
#​60 0x0000000000e82e17 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) /home/xxx/data/git/llvm-project/clang/tools/driver/driver.cpp:330:12
#​61 0x000000000ff0a39d clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const::$_1::operator()() const /home/xxx/data/git/llvm-project/clang/lib/Driver/Job.cpp:404:30
#​62 0x000000000ff0a39d void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const::$_1>(long) /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:185:0
#​63 0x000000000d503de4 llvm::function_ref<void ()>::operator()() const /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/STLExtras.h:209:12
#​64 0x000000000d503de4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) /home/xxx/data/git/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:424:0
#​65 0x000000000ff08be2 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optionalllvm::StringRef >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, bool) const /home/xxx/data/git/llvm-project/clang/lib/Driver/Job.cpp:404:7
#​66 0x000000000fdfc32e clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const /home/xxx/data/git/llvm-project/clang/lib/Driver/Compilation.cpp:195:15
#​67 0x000000000fdfcf7c clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const /home/xxx/data/git/llvm-project/clang/lib/Driver/Compilation.cpp:248:19
#​68 0x000000000fe6126a llvm::SmallVectorBase::empty() const /home/xxx/data/git/llvm-project/llvm/include/llvm/ADT/SmallVector.h:0:0
#​69 0x000000000fe6126a clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) /home/xxx/data/git/llvm-project/clang/lib/Driver/Driver.cpp:1529:0
#​70 0x0000000000e7fd4f main /home/xxx/data/git/llvm-project/clang/tools/driver/driver.cpp:502:21
#​71 0x00007f35f0997b97 __libc_start_main /build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:344:0
#​72 0x0000000000d7aada _start (/data/xxx/git/llvm-project/build_trunk/bin/clang+0xd7aada)
clang-13: error: clang frontend command failed with exit code 134 (use -v to see invocation)
clang version 13.0.0 (https://github.com/llvm/llvm-project.git b006902)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /data/xxx/git/llvm-project/build_trunk/bin
clang-13: note: diagnostic msg:

---

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-13: note: diagnostic msg: /tmp/test-0b4587.c
clang-13: note: diagnostic msg: /tmp/test-0b4587.sh
clang-13: note: diagnostic msg:

---

[llvmbot]

@llvm/issue-subscribers-clang-frontend

[llvmbot]

@llvm/issue-subscribers-c

[AaronBallman]

The issue is still present as of Clang 16.0.0. It only occurs for C builds and it requires assertions to be enabled: https://gcc.godbolt.org/z/5sqPdoznb