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Clang crash, when implementing "P2637R3 Member visit" #75819

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H-G-Hristov opened this issue Dec 18, 2023 · 5 comments
Closed

Clang crash, when implementing "P2637R3 Member visit" #75819

H-G-Hristov opened this issue Dec 18, 2023 · 5 comments
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clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] question A question, not bug report. Check out https://llvm.org/docs/GettingInvolved.html instead!

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@H-G-Hristov
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H-G-Hristov commented Dec 18, 2023 •
edited
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Added the following to libc++ header <visit>:

#  if _LIBCPP_STD_VER >= 26
  // [variant.visit], visitation
  template <class _Self, class _Visitor>
  constexpr decltype(auto) visit(this _Self&& __self, _Visitor&& __visitor) {
    using _V = _OverrideRef<_Self&&, _CopyConst<remove_reference_t<_Self>, variant>>;
    return std::visit(std::forward<_Visitor>(__visitor), (_V)__self);
  }

  template <class _R, class _Self, class _Visitor>
  constexpr _R visit(this _Self&& __self, _Visitor&& __visitor) {
    using _V = _OverrideRef<_Self&&, _CopyConst<remove_reference_t<_Self>, variant>>;
    return std::visit<_R>(std::forward<_Visitor>(__visitor), (_V)__self);
  }
#  endif

Added in libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp

    obj.visit(v);
    assert(Fn::check_call<int &>(CT_NonConst | CT_LValue));
+ ./build/default.debug.libcxx/bin/llvm-lit --param std=c++26 -sv libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
+ tee ./zsh_output/libcxx-test-std-utilities-variant-variant.visit-visit.pass.cpp.c++26.log
llvm-lit: /home/histo/Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{cxx} substitution: '/usr/bin/clang-18'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{flags} substitution: '-pthread --target=x86_64-unknown-linux-gnu'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{compile_flags} substitution: '-nostdinc++ -I %{include} -I %{target-include} -I %{libcxx}/test/support -std=c++26 -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBCPP_ENABLE_EXPERIMENTAL -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -Werror=thread-safety -Wuser-defined-warnings'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{link_flags} substitution: '-lc++experimental -nostdlib++ -L %{lib} -Wl,-rpath,%{lib} -lc++ -latomic'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{exec} substitution: '%{executor} --execdir %T -- '
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) All available features: -faligned-allocation, -fsized-deallocation, add-latomic-workaround, buildhost=linux, c++26, c++experimental, clang, clang-18, clang-18.0, clang-18.0.0, diagnose-if-support, gcc-style-warnings, glibc-old-ru_RU-decimal-point, has-64-bit-atomics, has-fblocks, has-fconstexpr-steps, has-unix-headers, host-has-gdb-with-python, is-lockfree-runtime-function, large_tests, libcpp-abi-version=1, libcpp-hardening-mode=debug, libcpp-has-no-std-modules, linux, locale.en_US.UTF-8, long_tests, non-lockfree-atomics, objective-c++, stdlib=libc++, stdlib=llvm-libc++, target=x86_64-unknown-linux-gnu, thread-safety, verify-support
-- Testing: 1 tests, 1 workers --
Testing: 
FAIL: llvm-libc++-shared.cfg.in :: std/utilities/variant/variant.visit/visit.pass.cpp (1 of 1)
******************** TEST 'llvm-libc++-shared.cfg.in :: std/utilities/variant/variant.visit/visit.pass.cpp' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# COMPILED WITH
/usr/bin/clang-18 /home//Projects/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp -pthread --target=x86_64-unknown-linux-gnu -nostdinc++ -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/libcxx/test/support -std=c++26 -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBCPP_ENABLE_EXPERIMENTAL -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -Werror=thread-safety -Wuser-defined-warnings  -lc++experimental -nostdlib++ -L /home//Projects/llvm-project/build/default.debug.libcxx/lib -Wl,-rpath,/home//Projects/llvm-project/build/default.debug.libcxx/lib -lc++ -latomic -o /home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit/Output/visit.pass.cpp.dir/t.tmp.exe
# executed command: /usr/bin/clang-18 /home//Projects/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp -pthread --target=x86_64-unknown-linux-gnu -nostdinc++ -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/libcxx/test/support -std=c++26 -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBCPP_ENABLE_EXPERIMENTAL -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -Werror=thread-safety -Wuser-defined-warnings -lc++experimental -nostdlib++ -L /home//Projects/llvm-project/build/default.debug.libcxx/lib -Wl,-rpath,/home//Projects/llvm-project/build/default.debug.libcxx/lib -lc++ -latomic -o /home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit/Output/visit.pass.cpp.dir/t.tmp.exe
# .---command stderr------------
# | 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: /usr/lib/llvm-18/bin/clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -dumpdir /home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit/Output/visit.pass.cpp.dir/t.tmp.exe- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name visit.pass.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit -fcoverage-compilation-dir=/home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit -nostdinc++ -resource-dir /usr/lib/llvm-18/lib/clang/18 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/libcxx/test/support -D _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D _LIBCPP_ENABLE_EXPERIMENTAL -D _LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -internal-isystem /usr/lib/llvm-18/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -Werror=thread-safety -Wuser-defined-warnings -std=c++26 -fdeprecated-macro -ferror-limit 19 -pthread -fgnuc-version=4.2.1 -fno-implicit-modules -fcxx-exceptions -fexceptions -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/lit-tmp-qujltmwb/visit-d8a4ea.o -x c++ /home//Projects/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
# | 1.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1505:69: current parser token ';'
# | 2.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:277:1 <Spelling=/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/__config:825:39>: parsing namespace 'std'
# | 3.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:277:1 <Spelling=/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/__config:826:39>: parsing namespace 'std::__1'
# | 4.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1307:1: parsing struct/union/class body 'std::variant'
# | 5.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1503:77: parsing function body 'std::variant::visit'
# | 6.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1503:77: in compound statement ('{}')
# |  #0 0x00007f494734ff46 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd4ff46)
# |  #1 0x00007f494734df00 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd4df00)
# |  #2 0x00007f494735060b (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd5060b)
# |  #3 0x00007f4945e42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
# |  #4 0x00007f494e9ffdf4 clang::CXXMethodDecl::isExplicitObjectMemberFunction() const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xdffdf4)
# |  #5 0x00007f494f40ff2d (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x180ff2d)
# |  #6 0x00007f494f40f788 clang::Sema::BuildPossibleImplicitMemberExpr(clang::CXXScopeSpec const&, clang::SourceLocation, clang::LookupResult&, clang::TemplateArgumentListInfo const*, clang::Scope const*, clang::UnresolvedLookupExpr*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x180f788)
# |  #7 0x00007f494f3b4d41 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x17b4d41)
# |  #8 0x00007f494f3ad6f5 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x17ad6f5)
# |  #9 0x00007f494f3a685d (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x17a685d)
# | #10 0x00007f494f38c3b4 clang::Sema::CorrectDelayedTyposInExpr(clang::Expr*, clang::VarDecl*, bool, llvm::function_ref<clang::ActionResult<clang::Expr*, true> (clang::Expr*)>) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x178c3b4)
# | #11 0x00007f494f590629 clang::Sema::ActOnReturnStmt(clang::SourceLocation, clang::Expr*, clang::Scope*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x1990629)
# | #12 0x00007f494e812130 clang::Parser::ParseReturnStatement() (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc12130)
# | #13 0x00007f494e80c339 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc0c339)
# | #14 0x00007f494e80b6bb clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc0b6bb)
# | #15 0x00007f494e813f10 clang::Parser::ParseCompoundStatementBody(bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc13f10)
# | #16 0x00007f494e814ff2 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc14ff2)
# | #17 0x00007f494e769ee1 clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb69ee1)
# | #18 0x00007f494e768c4a clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb68c4a)
# | #19 0x00007f494e79f51b clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb9f51b)
# | #20 0x00007f494e79cc9e clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb9cc9e)
# | #21 0x00007f494e77eafe clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb7eafe)
# | #22 0x00007f494e81ca74 clang::Parser::ParseSingleDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo const&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc1ca74)
# | #23 0x00007f494e81bd92 clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc1bd92)
# | #24 0x00007f494e81b73b clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc1b73b)
# | #25 0x00007f494e778eda clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb78eda)
# | #26 0x00007f494e82d4c0 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2d4c0)
# | #27 0x00007f494e7953bb clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb953bb)
# | #28 0x00007f494e794e00 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb94e00)
# | #29 0x00007f494e779170 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb79170)
# | #30 0x00007f494e82d4c0 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2d4c0)
# | #31 0x00007f494e7953bb clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb953bb)
# | #32 0x00007f494e794e00 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb94e00)
# | #33 0x00007f494e77909e clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb7909e)
# | #34 0x00007f494e82d4c0 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2d4c0)
# | #35 0x00007f494e82c03a clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2c03a)
# | #36 0x00007f494e7653ce clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb653ce)
# | #37 0x00007f4950574165 clang::FrontendAction::Execute() (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x2974165)
# | #38 0x00007f49504ed9e4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x28ed9e4)
# | #39 0x00007f49505ee0be clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x29ee0be)
# | #40 0x000055dce85f6cf5 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-18/bin/clang+0x12cf5)
# | #41 0x000055dce85f4185 (/usr/lib/llvm-18/bin/clang+0x10185)
# | #42 0x000055dce85f3336 clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-18/bin/clang+0xf336)
# | #43 0x000055dce8600ab2 main (/usr/lib/llvm-18/bin/clang+0x1cab2)
# | #44 0x00007f4945e29d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
# | #45 0x00007f4945e29e40 call_init ./csu/../csu/libc-start.c:128:20
# | #46 0x00007f4945e29e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
# | #47 0x000055dce85f0bb5 _start (/usr/lib/llvm-18/bin/clang+0xcbb5)
# | clang-18: error: unable to execute command: Segmentation fault (core dumped)
# | clang-18: error: clang frontend command failed due to signal (use -v to see invocation)
# | Ubuntu clang version 18.0.0 (++20231215042254+f4b5be1ecdc8-1~exp1~20231215042405.1371)
# | Target: x86_64-unknown-linux-gnu
# | Thread model: posix
# | InstalledDir: /usr/bin
# | clang-18: note: diagnostic msg: 
# | ********************
# | 
# | PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
# | Preprocessed source(s) and associated run script(s) are located at:
# | clang-18: note: diagnostic msg: /tmp/lit-tmp-qujltmwb/visit-8ecec2.cpp
# | clang-18: note: diagnostic msg: /tmp/lit-tmp-qujltmwb/visit-8ecec2.sh
# | clang-18: note: diagnostic msg: 
# | 
# | ********************
# `-----------------------------
# error: command failed with exit status: 1

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
********************
Failed Tests (1):
  llvm-libc++-shared.cfg.in :: std/utilities/variant/variant.visit/visit.pass.cpp


Testing Time: 3.18s

Total Discovered Tests: 1
  Failed: 1 (100.00%)
@github-actions github-actions bot added the clang Clang issues not falling into any other category label Dec 18, 2023
@EugeneZelenko EugeneZelenko added clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] and removed clang Clang issues not falling into any other category labels Dec 18, 2023
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llvmbot commented Dec 18, 2023

@llvm/issue-subscribers-clang-frontend

Author: Hristo Hristov (H-G-Hristov)

Added the following to libc++ header `<visit>`: 
#  if _LIBCPP_STD_VER &gt;= 26
  // [variant.visit], visitation
  template &lt;class _Self, class _Visitor&gt;
  constexpr decltype(auto) visit(this _Self&amp;&amp; __self, _Visitor&amp;&amp; __visitor) {
    using _V = _OverrideRef&lt;_Self&amp;&amp;, _CopyConst&lt;remove_reference_t&lt;_Self&gt;, variant&gt;&gt;;
    return std::visit(std::forward&lt;_Visitor&gt;(__visitor), (_V)__self);
  }

  template &lt;class _R, class _Self, class _Visitor&gt;
  constexpr _R visit(this _Self&amp;&amp; __self, _Visitor&amp;&amp; __visitor) {
    using _V = _OverrideRef&lt;_Self&amp;&amp;, _CopyConst&lt;remove_reference_t&lt;_Self&gt;, variant&gt;&gt;;
    return std::visit&lt;_R&gt;(std::forward&lt;_Visitor&gt;(__visitor), (_V)__self);
  }
#  endif

Added in libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp

    obj.visit(v);
    assert(Fn::check_call&lt;int &amp;&gt;(CT_NonConst | CT_LValue));
+ ./build/default.debug.libcxx/bin/llvm-lit --param std=c++26 -sv libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
+ tee ./zsh_output/libcxx-test-std-utilities-variant-variant.visit-visit.pass.cpp.c++26.log
llvm-lit: /home/histo/Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{cxx} substitution: '/usr/bin/clang-18'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{flags} substitution: '-pthread --target=x86_64-unknown-linux-gnu'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{compile_flags} substitution: '-nostdinc++ -I %{include} -I %{target-include} -I %{libcxx}/test/support -std=c++26 -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBCPP_ENABLE_EXPERIMENTAL -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -Werror=thread-safety -Wuser-defined-warnings'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{link_flags} substitution: '-lc++experimental -nostdlib++ -L %{lib} -Wl,-rpath,%{lib} -lc++ -latomic'
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) Using %{exec} substitution: '%{executor} --execdir %T -- '
llvm-lit: /home//Projects/llvm-project/libcxx/utils/libcxx/test/config.py:20: note: (llvm-libc++-shared.cfg.in) All available features: -faligned-allocation, -fsized-deallocation, add-latomic-workaround, buildhost=linux, c++26, c++experimental, clang, clang-18, clang-18.0, clang-18.0.0, diagnose-if-support, gcc-style-warnings, glibc-old-ru_RU-decimal-point, has-64-bit-atomics, has-fblocks, has-fconstexpr-steps, has-unix-headers, host-has-gdb-with-python, is-lockfree-runtime-function, large_tests, libcpp-abi-version=1, libcpp-hardening-mode=debug, libcpp-has-no-std-modules, linux, locale.en_US.UTF-8, long_tests, non-lockfree-atomics, objective-c++, stdlib=libc++, stdlib=llvm-libc++, target=x86_64-unknown-linux-gnu, thread-safety, verify-support
-- Testing: 1 tests, 1 workers --
Testing: 
FAIL: llvm-libc++-shared.cfg.in :: std/utilities/variant/variant.visit/visit.pass.cpp (1 of 1)
******************** TEST 'llvm-libc++-shared.cfg.in :: std/utilities/variant/variant.visit/visit.pass.cpp' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# COMPILED WITH
/usr/bin/clang-18 /home//Projects/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp -pthread --target=x86_64-unknown-linux-gnu -nostdinc++ -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/libcxx/test/support -std=c++26 -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBCPP_ENABLE_EXPERIMENTAL -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -Werror=thread-safety -Wuser-defined-warnings  -lc++experimental -nostdlib++ -L /home//Projects/llvm-project/build/default.debug.libcxx/lib -Wl,-rpath,/home//Projects/llvm-project/build/default.debug.libcxx/lib -lc++ -latomic -o /home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit/Output/visit.pass.cpp.dir/t.tmp.exe
# executed command: /usr/bin/clang-18 /home//Projects/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp -pthread --target=x86_64-unknown-linux-gnu -nostdinc++ -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/libcxx/test/support -std=c++26 -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D_LIBCPP_ENABLE_EXPERIMENTAL -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -Werror=thread-safety -Wuser-defined-warnings -lc++experimental -nostdlib++ -L /home//Projects/llvm-project/build/default.debug.libcxx/lib -Wl,-rpath,/home//Projects/llvm-project/build/default.debug.libcxx/lib -lc++ -latomic -o /home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit/Output/visit.pass.cpp.dir/t.tmp.exe
# .---command stderr------------
# | 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: /usr/lib/llvm-18/bin/clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -dumpdir /home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit/Output/visit.pass.cpp.dir/t.tmp.exe- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name visit.pass.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit -fcoverage-compilation-dir=/home//Projects/llvm-project/build/default.debug.libcxx/test/std/utilities/variant/variant.visit -nostdinc++ -resource-dir /usr/lib/llvm-18/lib/clang/18 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1 -I /home//Projects/llvm-project/libcxx/test/support -D _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER -D _LIBCPP_ENABLE_EXPERIMENTAL -D _LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG -internal-isystem /usr/lib/llvm-18/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Werror -Wall -Wctad-maybe-unsupported -Wextra -Wshadow -Wundef -Wunused-template -Wno-unused-command-line-argument -Wno-attributes -Wno-pessimizing-move -Wno-noexcept-type -Wno-atomic-alignment -Wno-reserved-module-identifier -Wdeprecated-copy -Wdeprecated-copy-dtor -Wno-user-defined-literals -Wno-tautological-compare -Wsign-compare -Wunused-variable -Wunused-parameter -Wunreachable-code -Wno-unused-local-typedef -Wno-local-type-template-args -Wno-c++11-extensions -Wno-unknown-pragmas -Wno-pass-failed -Wno-mismatched-new-delete -Wno-redundant-move -Wno-self-move -Werror=thread-safety -Wuser-defined-warnings -std=c++26 -fdeprecated-macro -ferror-limit 19 -pthread -fgnuc-version=4.2.1 -fno-implicit-modules -fcxx-exceptions -fexceptions -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/lit-tmp-qujltmwb/visit-d8a4ea.o -x c++ /home//Projects/llvm-project/libcxx/test/std/utilities/variant/variant.visit/visit.pass.cpp
# | 1.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1505:69: current parser token ';'
# | 2.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:277:1 &lt;Spelling=/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/__config:825:39&gt;: parsing namespace 'std'
# | 3.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:277:1 &lt;Spelling=/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/__config:826:39&gt;: parsing namespace 'std::__1'
# | 4.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1307:1: parsing struct/union/class body 'std::variant'
# | 5.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1503:77: parsing function body 'std::variant::visit'
# | 6.	/home//Projects/llvm-project/build/default.debug.libcxx/include/c++/v1/variant:1503:77: in compound statement ('{}')
# |  #<!-- -->0 0x00007f494734ff46 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd4ff46)
# |  #<!-- -->1 0x00007f494734df00 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd4df00)
# |  #<!-- -->2 0x00007f494735060b (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd5060b)
# |  #<!-- -->3 0x00007f4945e42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
# |  #<!-- -->4 0x00007f494e9ffdf4 clang::CXXMethodDecl::isExplicitObjectMemberFunction() const (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xdffdf4)
# |  #<!-- -->5 0x00007f494f40ff2d (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x180ff2d)
# |  #<!-- -->6 0x00007f494f40f788 clang::Sema::BuildPossibleImplicitMemberExpr(clang::CXXScopeSpec const&amp;, clang::SourceLocation, clang::LookupResult&amp;, clang::TemplateArgumentListInfo const*, clang::Scope const*, clang::UnresolvedLookupExpr*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x180f788)
# |  #<!-- -->7 0x00007f494f3b4d41 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x17b4d41)
# |  #<!-- -->8 0x00007f494f3ad6f5 (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x17ad6f5)
# |  #<!-- -->9 0x00007f494f3a685d (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x17a685d)
# | #<!-- -->10 0x00007f494f38c3b4 clang::Sema::CorrectDelayedTyposInExpr(clang::Expr*, clang::VarDecl*, bool, llvm::function_ref&lt;clang::ActionResult&lt;clang::Expr*, true&gt; (clang::Expr*)&gt;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x178c3b4)
# | #<!-- -->11 0x00007f494f590629 clang::Sema::ActOnReturnStmt(clang::SourceLocation, clang::Expr*, clang::Scope*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x1990629)
# | #<!-- -->12 0x00007f494e812130 clang::Parser::ParseReturnStatement() (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc12130)
# | #<!-- -->13 0x00007f494e80c339 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc0c339)
# | #<!-- -->14 0x00007f494e80b6bb clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc0b6bb)
# | #<!-- -->15 0x00007f494e813f10 clang::Parser::ParseCompoundStatementBody(bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc13f10)
# | #<!-- -->16 0x00007f494e814ff2 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc14ff2)
# | #<!-- -->17 0x00007f494e769ee1 clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb69ee1)
# | #<!-- -->18 0x00007f494e768c4a clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb68c4a)
# | #<!-- -->19 0x00007f494e79f51b clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&amp;, unsigned int, clang::Decl*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb9f51b)
# | #<!-- -->20 0x00007f494e79cc9e clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb9cc9e)
# | #<!-- -->21 0x00007f494e77eafe clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb7eafe)
# | #<!-- -->22 0x00007f494e81ca74 clang::Parser::ParseSingleDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo const&amp;, clang::ParsingDeclRAIIObject&amp;, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc1ca74)
# | #<!-- -->23 0x00007f494e81bd92 clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc1bd92)
# | #<!-- -->24 0x00007f494e81b73b clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::AccessSpecifier) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc1b73b)
# | #<!-- -->25 0x00007f494e778eda clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb78eda)
# | #<!-- -->26 0x00007f494e82d4c0 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2d4c0)
# | #<!-- -->27 0x00007f494e7953bb clang::Parser::ParseInnerNamespace(llvm::SmallVector&lt;clang::Parser::InnerNamespaceInfo, 4u&gt; const&amp;, unsigned int, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::BalancedDelimiterTracker&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb953bb)
# | #<!-- -->28 0x00007f494e794e00 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::SourceLocation) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb94e00)
# | #<!-- -->29 0x00007f494e779170 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb79170)
# | #<!-- -->30 0x00007f494e82d4c0 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2d4c0)
# | #<!-- -->31 0x00007f494e7953bb clang::Parser::ParseInnerNamespace(llvm::SmallVector&lt;clang::Parser::InnerNamespaceInfo, 4u&gt; const&amp;, unsigned int, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::BalancedDelimiterTracker&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb953bb)
# | #<!-- -->32 0x00007f494e794e00 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::SourceLocation) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb94e00)
# | #<!-- -->33 0x00007f494e77909e clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb7909e)
# | #<!-- -->34 0x00007f494e82d4c0 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2d4c0)
# | #<!-- -->35 0x00007f494e82c03a clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xc2c03a)
# | #<!-- -->36 0x00007f494e7653ce clang::ParseAST(clang::Sema&amp;, bool, bool) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0xb653ce)
# | #<!-- -->37 0x00007f4950574165 clang::FrontendAction::Execute() (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x2974165)
# | #<!-- -->38 0x00007f49504ed9e4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x28ed9e4)
# | #<!-- -->39 0x00007f49505ee0be clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-18/bin/../lib/libclang-cpp.so.18+0x29ee0be)
# | #<!-- -->40 0x000055dce85f6cf5 cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/usr/lib/llvm-18/bin/clang+0x12cf5)
# | #<!-- -->41 0x000055dce85f4185 (/usr/lib/llvm-18/bin/clang+0x10185)
# | #<!-- -->42 0x000055dce85f3336 clang_main(int, char**, llvm::ToolContext const&amp;) (/usr/lib/llvm-18/bin/clang+0xf336)
# | #<!-- -->43 0x000055dce8600ab2 main (/usr/lib/llvm-18/bin/clang+0x1cab2)
# | #<!-- -->44 0x00007f4945e29d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
# | #<!-- -->45 0x00007f4945e29e40 call_init ./csu/../csu/libc-start.c:128:20
# | #<!-- -->46 0x00007f4945e29e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
# | #<!-- -->47 0x000055dce85f0bb5 _start (/usr/lib/llvm-18/bin/clang+0xcbb5)
# | clang-18: error: unable to execute command: Segmentation fault (core dumped)
# | clang-18: error: clang frontend command failed due to signal (use -v to see invocation)
# | Ubuntu clang version 18.0.0 (++20231215042254+f4b5be1ecdc8-1~exp1~20231215042405.1371)
# | Target: x86_64-unknown-linux-gnu
# | Thread model: posix
# | InstalledDir: /usr/bin
# | clang-18: note: diagnostic msg: 
# | ********************
# | 
# | PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
# | Preprocessed source(s) and associated run script(s) are located at:
# | clang-18: note: diagnostic msg: /tmp/lit-tmp-qujltmwb/visit-8ecec2.cpp
# | clang-18: note: diagnostic msg: /tmp/lit-tmp-qujltmwb/visit-8ecec2.sh
# | clang-18: note: diagnostic msg: 
# | 
# | ********************
# `-----------------------------
# error: command failed with exit status: 1

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
********************
Failed Tests (1):
  llvm-libc++-shared.cfg.in :: std/utilities/variant/variant.visit/visit.pass.cpp


Testing Time: 3.18s

Total Discovered Tests: 1
  Failed: 1 (100.00%)

@H-G-Hristov
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H-G-Hristov commented Dec 18, 2023 •
edited
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@cor3ntin Could this be a "deducing this" issue, which is the only "unusual" thing?

@cor3ntin
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This looks very similar to #75732

@cor3ntin
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@H-G-Hristov the crash will be fixed by #75913
There seems to be the same function defined twice in your code (also make sure std::visit is defined at the point it is called)

@EugeneZelenko EugeneZelenko added the question A question, not bug report. Check out https://llvm.org/docs/GettingInvolved.html instead! label Dec 21, 2023
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It's fixed. Thank you!

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clang:frontend Language frontend issues, e.g. anything involving "Sema" crash Prefer [crash-on-valid] or [crash-on-invalid] question A question, not bug report. Check out https://llvm.org/docs/GettingInvolved.html instead!
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@cor3ntin @EugeneZelenko @H-G-Hristov @llvmbot