https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128418
Bug ID: 128418
Summary: ICE (segmentation fault) in mangle_decl with C++26
pack index as a function return type
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: chickenporkgyoza at gmail dot com
Target Milestone: ---
Compiling the following valid C++26 causes an internal compiler error
(segmentation fault) during the name-mangling phase (mangle_decl).
Command: g++ -std=c++26 -Wall -Wextra -c main.cpp
template<typename... Ts>
Ts...[0]::type f() {
return {};
}
struct S {
using type = int;
};
int main() {
f<S>();
}
Backtrace:
main.cpp:2:16: internal compiler error: Segmentation fault
2 | Ts...[0]::type f() {
| ^
0x2ca8858 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*), diagnostics::kind)
???:0
0x2c9d49b internal_error(char const*, ...)
???:0
0xd16139 mangle_decl(tree_node*)
???:0
0x19a5305 decl_assembler_name(tree_node*)
???:0
0x106f5b6 symbol_table::finalize_compilation_unit()
???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gnu.org> for instructions.
