[llvm-bugs] [Bug 39742] New: Assertion failure on second instantiation of class template that defines a friend function template
via llvm-bugs
llvm-bugs at lists.llvm.org
Wed Nov 21 11:14:33 PST 2018
https://bugs.llvm.org/show_bug.cgi?id=39742
Bug ID: 39742
Summary: Assertion failure on second instantiation of class
template that defines a friend function template
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangbugs at nondot.org
Reporter: david at doublewise.net
CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
richard-llvm at metafoo.co.uk
When compiled with an asserts-enabled build of clang, the following code
template<typename>
struct wrapper {
template<typename>
friend void friend_function_template() {}
};
wrapper<bool> x;
wrapper<int> y;
Causes the following error:
clang-8: /home/david/llvm/clang/lib/AST/DeclTemplate.cpp:334: void
clang::FunctionTemplateDecl::mergePrevDecl(clang::FunctionTemplateDecl *):
Assertion `ThisCommon->Specializations.size() == 0 &&
!ThisCommon->InstantiatedFromMember.getPointer() &&
!ThisCommon->InstantiatedFromMember.getInt() && "Can't merge incompatible
declarations!"' failed.
Stack dump:
0. Program arguments: /home/david/llvm/build/bin/clang-8 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
concatenate_view.cpp -mrelocation-model static -mthread-model posix
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -coverage-notes-file
/home/david/tm1/bounded_integer/build/concatenate_view.gcno -resource-dir
/home/david/llvm/build/lib/clang/8.0.0 -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8 -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/x86_64-pc-linux-gnu
-internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8/backward
-internal-isystem /usr/local/include -internal-isystem
/home/david/llvm/build/lib/clang/8.0.0/include -internal-externc-isystem
/include -internal-externc-isystem /usr/include -fdeprecated-macro
-fdebug-compilation-dir /home/david/tm1/bounded_integer/build -ferror-limit 19
-fmessage-length 211 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o concatenate_view.o -x c++
../source/containers/algorithms/concatenate_view.cpp -faddrsig
1. ../source/containers/algorithms/concatenate_view.cpp:8:15: current
parser token ';'
2. ../source/containers/algorithms/concatenate_view.cpp:2:8: instantiating
class definition 'wrapper<int>'
#0 0x00000000017a8cfd PrintStackTraceSignalHandler(void*)
(.llvm.12021122941227921363) (/home/david/llvm/build/bin/clang-8+0x17a8cfd)
#1 0x00000000017a651e llvm::sys::RunSignalHandlers()
(/home/david/llvm/build/bin/clang-8+0x17a651e)
#2 0x00000000017a8eb8 SignalHandler(int)
(/home/david/llvm/build/bin/clang-8+0x17a8eb8)
#3 0x00007f46c3365360 __restore_rt (/lib64/libpthread.so.0+0x14360)
#4 0x00007f46c261114b gsignal (/lib64/libc.so.6+0x3814b)
#5 0x00007f46c25fa41d abort (/lib64/libc.so.6+0x2141d)
#6 0x00007f46c25fa2ef __tls_get_addr (/lib64/libc.so.6+0x212ef)
#7 0x00007f46c2608a52 (/lib64/libc.so.6+0x2fa52)
#8 0x0000000003867748
clang::FunctionTemplateDecl::mergePrevDecl(clang::FunctionTemplateDecl*)
(/home/david/llvm/build/bin/clang-8+0x3867748)
#9 0x0000000002f8cfc7 clang::Sema::CheckFunctionDeclaration(clang::Scope*,
clang::FunctionDecl*, clang::LookupResult&, bool)
(/home/david/llvm/build/bin/clang-8+0x2f8cfc7)
#10 0x000000000355bcd6
clang::TemplateDeclInstantiator::VisitFunctionDecl(clang::FunctionDecl*,
clang::TemplateParameterList*) (/home/david/llvm/build/bin/clang-8+0x355bcd6)
#11 0x00000000035593c4
clang::TemplateDeclInstantiator::VisitFunctionTemplateDecl(clang::FunctionTemplateDecl*)
(/home/david/llvm/build/bin/clang-8+0x35593c4)
#12 0x00000000035552c3
clang::TemplateDeclInstantiator::VisitFriendDecl(clang::FriendDecl*)
(/home/david/llvm/build/bin/clang-8+0x35552c3)
#13 0x0000000003517db7 clang::Sema::InstantiateClass(clang::SourceLocation,
clang::CXXRecordDecl*, clang::CXXRecordDecl*,
clang::MultiLevelTemplateArgumentList const&,
clang::TemplateSpecializationKind, bool)
(/home/david/llvm/build/bin/clang-8+0x3517db7)
#14 0x000000000351a026
clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation,
clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind,
bool) (/home/david/llvm/build/bin/clang-8+0x351a026)
#15 0x00000000035a367d
clang::Sema::RequireCompleteTypeImpl(clang::SourceLocation, clang::QualType,
clang::Sema::TypeDiagnoser*) (/home/david/llvm/build/bin/clang-8+0x35a367d)
#16 0x00000000035a3023 clang::Sema::RequireCompleteType(clang::SourceLocation,
clang::QualType, clang::Sema::TypeDiagnoser&)
(/home/david/llvm/build/bin/clang-8+0x35a3023)
#17 0x0000000002f6e6d7 clang::Sema::ActOnUninitializedDecl(clang::Decl*)
(/home/david/llvm/build/bin/clang-8+0x2f6e6d7)
#18 0x0000000002bb1956
clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*)
(/home/david/llvm/build/bin/clang-8+0x2bb1956)
#19 0x0000000002baff4e clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/home/david/llvm/build/bin/clang-8+0x2baff4e)
#20 0x0000000002b8e658
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/home/david/llvm/build/bin/clang-8+0x2b8e658)
#21 0x0000000002b8ded9
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier)
(/home/david/llvm/build/bin/clang-8+0x2b8ded9)
#22 0x0000000002b8c3ec
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) (/home/david/llvm/build/bin/clang-8+0x2b8c3ec)
#23 0x0000000002b8b2ad
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/home/david/llvm/build/bin/clang-8+0x2b8b2ad)
#24 0x0000000002b86446 clang::ParseAST(clang::Sema&, bool, bool)
(/home/david/llvm/build/bin/clang-8+0x2b86446)
#25 0x0000000001f9e06b clang::FrontendAction::Execute()
(/home/david/llvm/build/bin/clang-8+0x1f9e06b)
#26 0x0000000001f36f01
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/david/llvm/build/bin/clang-8+0x1f36f01)
#27 0x00000000020511b2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/david/llvm/build/bin/clang-8+0x20511b2)
#28 0x00000000007fe77d cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/home/david/llvm/build/bin/clang-8+0x7fe77d)
#29 0x00000000007fc825 main (/home/david/llvm/build/bin/clang-8+0x7fc825)
#30 0x00007f46c25fc4eb __libc_start_main (/lib64/libc.so.6+0x234eb)
#31 0x00000000007f92ba _start (/home/david/llvm/build/bin/clang-8+0x7f92ba)
clang-8: error: unable to execute command: Aborted (core dumped)
clang-8: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 8.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/david/llvm/build/bin
clang-8: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.llvm.org/ and include the crash backtrace, preprocessed source,
and associated run script.
clang-8: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-8: note: diagnostic msg: /tmp/concatenate_view-c22b50.cpp
clang-8: note: diagnostic msg: /tmp/concatenate_view-c22b50.sh
clang-8: note: diagnostic msg:
********************
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