https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104847
Bug ID: 104847
Summary: [11/12 Regression] ICE in write_unqualified_name, at
cp/mangle.cc:1406
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Started between 20200705 and 20200712 :
$ cat z1.cc
struct S { int i; };
union U { S k; };
template <class T, class... Ts> T sink(T&&, Ts&&...);
template <class T>
decltype(sink(U{1},T())) f(T) { return U{1}; }
int main() { f(3); }
$ g++-11-20200705 -c z1.cc
$
$ g++-12-20220306 -c z1.cc
z1.cc: In instantiation of 'decltype (sink(U{1}, T())) f(T) [with T = int]':
z1.cc:5:26: internal compiler error: Segmentation fault
5 | decltype(sink(U{1},T())) f(T) { return U{1}; }
| ^
0xda3e3f crash_signal
../../gcc/toplev.cc:322
0x77dc08 write_unqualified_name
../../gcc/cp/mangle.cc:1406
0x783f89 write_expression
../../gcc/cp/mangle.cc:3370
0x782e96 write_expression
../../gcc/cp/mangle.cc:3507
0x77fb94 write_type
../../gcc/cp/mangle.cc:2372
0x7815f9 write_bare_function_type
../../gcc/cp/mangle.cc:2775
0x781699 write_encoding
../../gcc/cp/mangle.cc:855
0x781c11 mangle_decl_string
../../gcc/cp/mangle.cc:4054
0x781e3b get_mangled_id
../../gcc/cp/mangle.cc:4075
0x781e3b mangle_decl(tree_node*)
../../gcc/cp/mangle.cc:4113
0x1016af2 decl_assembler_name(tree_node*)
../../gcc/tree.cc:700
0x9901ef symtab_node::get_comdat_group_id()
../../gcc/cgraph.h:254
0x9901ef analyze_functions
../../gcc/cgraphunit.cc:1192
0x9913bd symbol_table::finalize_compilation_unit()
../../gcc/cgraphunit.cc:2500
