| Issue |
181603
|
| Summary |
ICE-on-invalid when defining a friend function inside a template struct
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Alcaro
|
```c++
template<int f>
void h();
template<int a>
struct b {
friend void h<1>() {}
};
template struct b<5>;
void d()
{
h<1>();
}
```
No flags needed. https://godbolt.org/z/aj365h8cK
Output:
<details>
<summary><source>:5:17: error: friend function specialization cannot be defined</summary>
```
<source>:5:17: error: friend function specialization cannot be defined
5 | friend void h<1>() {}
| ^
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-21.1.0/bin/clang++ -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-15.2.0 -fcolor-diagnostics -fno-crash-diagnostics <source>
1. <eof> parser at end of file
2. <source>:5:17: instantiating function definition 'h<1>'
#0 0x0000000003bfa6c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x3bfa6c8)
#1 0x0000000003bf809c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x3bf809c)
#2 0x0000000003b483f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007e5477a42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000000c47269 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (.cold) SemaTemplateInstantiateDecl.cpp:0:0
#5 0x0000000006d892d8 clang::Sema::PerformPendingInstantiations(bool, bool) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x6d892d8)
#6 0x0000000006350ec9 clang::Sema::ActOnEndOfTranslationUnitFragment(clang::TUFragmentKind) (.part.0) Sema.cpp:0:0
#7 0x00000000063511a4 clang::Sema::ActOnEndOfTranslationUnit() (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x63511a4)
#8 0x00000000061a0888 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x61a0888)
#9 0x000000000618ef7a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x618ef7a)
#10 0x000000000454985d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x454985d)
#11 0x000000000485b83a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x485b83a)
#12 0x00000000047d655b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x47d655b)
#13 0x000000000494e513 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x494e513)
#14 0x0000000000da5f25 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0xda5f25)
#15 0x0000000000d9de2d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#16 0x00000000045bb869 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
#17 0x0000000003b48813 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x3b48813)
#18 0x00000000045bba89 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
#19 0x000000000457eddd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x457eddd)
#20 0x000000000457fd91 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x457fd91)
#21 0x000000000458d29c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0x458d29c)
#22 0x0000000000da2751 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0xda2751)
#23 0x0000000000c526f4 main (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0xc526f4)
#24 0x00007e5477a29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#25 0x00007e5477a29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#26 0x0000000000d9d8c5 _start (/opt/compiler-explorer/clang-21.1.0/bin/clang+++0xd9d8c5)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
</details>
Expected: Just the first three lines
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