https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126752
Bug ID: 126752
Summary: ICE in build_vec_init when initializing an array
member of an aggregate
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: s.kimura.h41104 at gmail dot com
Target Milestone: ---
Compiler Explorer: https://godbolt.org/z/MhTo7e9sf
Reproducer:
```
struct C {
struct V_impl {
constexpr V_impl() {}
};
struct V_base {
~V_base();
V_impl v_impl;
};
struct vec : private V_base {};
struct S {
S();
};
struct V {
vec vv{};
};
struct FOO {
V v[1]{};
S s;
};
void foo() { FOO{}; }
};
```
Backtrace:
<source>: In member function 'void C::foo()':
<source>:20:20: internal compiler error: in build_vec_init, at cp/init.cc:5368
20 | void foo() { FOO{}; }
| ^
0x2b97f28 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x2b8cb6b internal_error(char const*, ...)
???:0
0xb40b7e fancy_abort(char const*, int, char const*)
???:0
0xe65584 expand_vec_init_expr(tree_node*, tree_node*, int, vec<tree_node*,
va_gc, vl_embed>**)
???:0
0xea3bb7 split_nonconstant_init(tree_node*, tree_node*)
???:0
0x1949d73 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
0xbf1b33 cp_fold_function(tree_node*)
???:0
0xc48837 finish_function(bool)
???:0
0xd96823 c_parse_file()
???:0
0xf29cf9 c_common_parse_file()
???:0
This ICE goes back to gcc-16:
https://godbolt.org/z/ffKno4Y4n
