https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115195
Bug ID: 115195
Summary: [12 Regression] Segfault when instantiating template
Product: gcc
Version: 12.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick at rivosinc dot com
Target Milestone: ---
Testcase:
enum a { b };
using c = int;
template <typename d> void e(int, int, int, c *, d, int) {
[](auto) {
[] {
struct {
} f;
};
};
}
int g, h;
a i() {
return b;
e({}, {}, g, &h, [] {}, {});
}
Backtrace (from godbolt since it's more verbose than my local backtrace):
> g++-12 reduced.cc
<source>: In instantiation of 'void e(int, int, int, c*, d, int) [with d =
i()::<lambda()>; c = int]':
<source>:14:4: required from here
<source>:5:5: internal compiler error: Segmentation fault
5 | [] {
| ^
0x1bbabfe internal_error(char const*, ...)
???:0
0x10b0223 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
???:0
0x10b0516 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
???:0
0x10b0223 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
???:0
0x870a79 check_for_bare_parameter_packs(tree_node*, unsigned int)
???:0
0x8a7dfb finish_expr_stmt(tree_node*)
???:0
0x891a08 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0x87e337 instantiate_decl(tree_node*, bool, bool)
???:0
0x899e8b instantiate_pending_templates(int)
???:0
0x7a5298 c_parse_final_cleanups()
???:0
Please submit a full bug report, with preprocessed source.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Godbolt: https://godbolt.org/z/dda478Po6
Only on GCC 12.
