[clang][OpenMP] crash on omp groupprivate #162243
Description
Reproducer:
https://godbolt.org/z/GqhbGjGeo
#pragma omp groupprivate(a)Backtrace:
clang++: /root/llvm-project/llvm/tools/clang/lib/Basic/Diagnostic.cpp:1258: void clang::Diagnostic::FormatDiagnostic(const char*, const char*, llvm::SmallVectorImpl<char>&) const: Assertion `ModifierLen == 0 && "unknown modifier for string"' failed.
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. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -fopenmp <source>
1. <eof> parser at end of file
#0 0x00000000041d20a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41d20a8)
#1 0x00000000041cf4d4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x41cf4d4)
#2 0x0000000004113668 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007b6f17442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007b6f174969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007b6f17442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007b6f174287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007b6f1742871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007b6f17439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x000000000440b6a4 clang::Diagnostic::FormatDiagnostic(char const*, char const*, llvm::SmallVectorImpl<char>&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x440b6a4)
#10 0x0000000004e6813a clang::TextDiagnosticPrinter::HandleDiagnostic(clang::DiagnosticsEngine::Level, clang::Diagnostic const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4e6813a)
#11 0x0000000004409090 clang::DiagnosticsEngine::Report(clang::DiagnosticsEngine::Level, clang::Diagnostic const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4409090)
#12 0x00000000044097a5 clang::DiagnosticsEngine::ProcessDiag(clang::DiagnosticBuilder const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44097a5)
#13 0x0000000004409885 clang::DiagnosticsEngine::EmitDiagnostic(clang::DiagnosticBuilder const&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4409885)
#14 0x0000000006a49a84 clang::Sema::EmitDiagnostic(unsigned int, clang::DiagnosticBuilder const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a49a84)
#15 0x0000000006ac1c02 clang::SemaBase::ImmediateDiagBuilder::~ImmediateDiagBuilder() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ac1c02)
#16 0x0000000006a36478 clang::SemaBase::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a36478)
#17 0x00000000070b187a clang::SemaOpenMP::ActOnOpenMPGroupPrivateDirective(clang::SourceLocation, llvm::ArrayRef<clang::Expr*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x70b187a)
#18 0x0000000006996439 clang::Parser::ParseOpenMPDeclarativeDirectiveWithExtDecl(clang::AccessSpecifier&, clang::ParsedAttributes&, bool, clang::TypeSpecifierType, clang::Decl*) (.part.0) ParseOpenMP.cpp:0:0
#19 0x00000000068c2938 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68c2938)
#20 0x00000000068c37c5 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68c37c5)
#21 0x00000000068c3c80 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68c3c80)
#22 0x00000000068a4df3 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x68a4df3)
#23 0x0000000004b14728 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b14728)
#24 0x0000000004e00195 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4e00195)
#25 0x0000000004d81dee clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d81dee)
#26 0x0000000004ef748d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ef748d)
#27 0x0000000000dbc110 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdbc110)
#28 0x0000000000db2c7a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#29 0x0000000000db2dfd int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#30 0x0000000004b7d8d9 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#31 0x0000000004113b04 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4113b04)
#32 0x0000000004b7deef clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#33 0x0000000004b3f1f2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b3f1f2)
#34 0x0000000004b4019e clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b4019e)
#35 0x0000000004b478d5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b478d5)
#36 0x0000000000db8639 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb8639)
#37 0x0000000000c6a194 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc6a194)
#38 0x00007b6f17429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#39 0x00007b6f17429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#40 0x0000000000db2715 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xdb2715)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134