| Issue |
185341
|
| Summary |
[clang] Crash when defining a previously declared function template as a non-template friend with global scope qualifier
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
dgodfrey206
|
```cpp
template<class>
struct D;
template<class T>
void foo(D<T>);
template<class T>
struct D {
friend void ::foo(D) {}
};
int main() {
foo( D<int>{} );
}
```
```
Compiler stderr
<source>:9:17: error: friend function definition cannot be qualified with '::'
9 | friend void ::foo(D) {}
Stack dump:
0. Program arguments: /cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir /app/output.s- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name example.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -fno-verbose-asm -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debug-info-kind=constructor -dwarf-version=5 -debugger-tuning=gdb -fdebug-compilation-dir=/app -fcoverage-compilation-dir=/app -resource-dir /cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/lib/clang/23 -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../include/c++/16.0.1 -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../include/c++/16.0.1/x86_64-linux-gnu -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../include/c++/16.0.1/backward -internal-isystem /cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/lib/clang/23/include -internal-isystem /cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/../include/x86_64-unknown-linux-gnu -internal-isystem /usr/local/include -internal-isystem /opt/compiler-explorer/gcc-snapshot/lib/gcc/x86_64-linux-gnu/16.0.1/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -std=c++23 -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -fdwarf2-cfi-asm -o /tmp/example-d10c73.o -x c++ <source>
1. <eof> parser at end of file
2. <source>:9:19: instantiating function definition 'foo<int>'
#0 0x0000000003e59568 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x3e59568)
#1 0x0000000003e566a4 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x0000000003e56798 SignalHandlerTerminate(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x000077cda0242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000000c9cbca clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (.cold) SemaTemplateInstantiateDecl.cpp:0:0
#5 0x000000000702ada8 clang::Sema::PerformPendingInstantiations(bool, bool) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x702ada8)
#6 0x00000000065be469 clang::Sema::ActOnEndOfTranslationUnitFragment(clang::TUFragmentKind) (.part.0) Sema.cpp:0:0
#7 0x00000000065be744 clang::Sema::ActOnEndOfTranslationUnit() (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x65be744)
#8 0x000000000641d53f clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x641d53f)
#9 0x00000000063f623a clang::ParseAST(clang::Sema&, bool, bool) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x63f623a)
#10 0x00000000048394e5 clang::CodeGenAction::ExecuteAction() (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x48394e5)
#11 0x0000000004b5b5ca clang::FrontendAction::Execute() (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x4b5b5ca)
#12 0x0000000004ad84bb clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x4ad84bb)
#13 0x0000000004c53e7b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0x4c53e7b)
#14 0x0000000000df8375 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0xdf8375)
#15 0x0000000000df003b ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#16 0x0000000000df2fcf clang_main(int, char**, llvm::ToolContext const&) (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0xdf2fcf)
#17 0x0000000000ca51fa main (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0xca51fa)
#18 0x000077cda0229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#19 0x000077cda0229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#20 0x0000000000defad5 _start (/cefs/52/52629d580b115717d73c025b_clang-trunk-20260308/bin/clang-23+0xdefad5)
clang++: error: unable to execute command: Segmentation fault (core dumped)
clang++: error: clang frontend command failed with exit code -2 (use -v to see invocation)
```
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