https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120696
Bug ID: 120696
Summary: ICE: tree check: accessed elt 2 of 'tree_vec' with 1
elts in tsubst, at cp/pt.cc:16758
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rush102333 at gmail dot com
Target Milestone: ---
$cat test_75.cpp
namespace Deduction {
template <typename T>
struct X0;
template <typename T>
class X0<T>;
template <typename T, unsigned N>
struct X0<T __attribute__((matrix_type(N, 3)))> {
static const unsigned value = 0;
};
typedef int __attribute__((matrix_type(2, 3))) int2;
int array0[X0<int2>::value == 0 ? 1 : -1];
}
$g++ -fsyntax-only test_75.cpp
<source>:5:7: error: partial specialization 'class Deduction::X0<T>' does not
specialize any template arguments; to define the primary template, remove the
template argument list
5 | class X0<T>;
| ^~~~~
<source>:3:8: note: primary template here
3 | struct X0;
| ^~
<source>:8:46: warning: ignoring attributes applied to dependent type 'T'
without an associated declaration [-Wattributes]
8 | struct X0<T __attribute__((matrix_type(N, 3)))> {
| ^
<source>:12:48: warning: 'matrix_type' attribute directive ignored
[-Wattributes]
12 | typedef int __attribute__((matrix_type(2, 3))) int2;
| ^~~~
<source>: In instantiation of 'struct Deduction::X0<int>':
<source>:14:20: required from here
14 | int array0[X0<int2>::value == 0 ? 1 : -1];
| ^~
<source>:8:49: internal compiler error: tree check: accessed elt 2 of
'tree_vec' with 1 elts in tsubst, at cp/pt.cc:16758
8 | struct X0<T __attribute__((matrix_type(N, 3)))> {
| ^
0x2835bc5 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x2857356 internal_error(char const*, ...)
???:0
0x9edccf tree_vec_elt_check_failed(int, int, char const*, int, char const*)
???:0
0xb5fa96 tree_vec_elt_check(tree_node*, int, char const*, int, char const*)
???:0
0xd3ce34 tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0xd573b9 tsubst_template_args(tree_node*, tree_node*, int, tree_node*)
???:0
0xd3bdeb tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0xd3c8a4 tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0xd6af19 instantiate_class_template(tree_node*)
???:0
0xd06cb3 c_parse_file()
???:0
0xe6e799 c_common_parse_file()
???: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://gcc.gnu.org/bugs/> for instructions.
Please see https://godbolt.org/z/7E5jYnKxK
