https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100632
Bug ID: 100632
Summary: [11/12 Regression] ICE: Segmentation fault (in
write_member_name)
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: error-recovery, ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
g++-12.0.0-alpha20210516 snapshot (g:4a322345cab10879162a2ddf659fb0f873ba0182)
ICEs when compiling the following testcase, extracted from
test/CodeGenCXX/mangle-class-nttp.cpp from the clang 12.0.0 test suite, w/
-std=c++20:
struct B { const int *p; };
template<B> void f();
struct Nested { union { int k; }; } nested;
template void f<B{&nested.k}>();
% g++-12.0.0 -std=c++20 -c hwmzjgfh.cpp
hwmzjgfh.cpp:6:31: internal compiler error: Segmentation fault
6 | template void f<B{&nested.k}>();
| ^
0x10dbb6f crash_signal
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/toplev.c:327
0x9ddcd5 tree_check(tree_node*, char const*, int, char const*, tree_code)
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/tree.h:3355
0x9ddcd5 write_member_name
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/mangle.c:2875
0x9db2ca write_expression
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/mangle.c:3412
0x9d9ad2 write_expression
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/mangle.c:3547
0x9dbc36 write_expression
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/mangle.c:3340
0x9de64f mangle_template_parm_object(tree_node*)
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/mangle.c:4518
0xaa0f1a get_template_parm_object
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:7162
0xacb8ab convert_nontype_argument
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:7647
0xacb8ab convert_template_argument
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:8546
0xacd2c3 coerce_template_parms
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:9025
0xada921 fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, conversion**, bool,
bool)
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:21504
0xadbbe4 get_bindings
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:24738
0xadcaf1 determine_specialization
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:2335
0xae235c determine_specialization
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:2158
0xae235c check_explicit_specialization(tree_node*, tree_node*, int, int,
tree_node*)
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/pt.c:3126
0x97c5e1 grokfndecl
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/decl.c:10119
0x9838fd grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/decl.c:13975
0xa747e4 cp_parser_explicit_instantiation
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/parser.c:18285
0xa85470 cp_parser_declaration
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210516/work/gcc-12-20210516/gcc/cp/parser.c:14127
