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From: "bob.steagall.cpp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/102547] New: g++ 11. ICE with NTTPs and partial specialization
Date: Thu, 30 Sep 2021 16:09:05 +0000 [thread overview]
Message-ID: <bug-102547-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102547
Bug ID: 102547
Summary: g++ 11. ICE with NTTPs and partial specialization
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bob.steagall.cpp at gmail dot com
Target Milestone: ---
The following C++ source code:
---------------------------------------------------------------------------
template<int... VALS>
struct vals {};
template<class V, class A>
struct vals_client {};
template<int V0, int V1, typename A>
struct vals_client<vals<V0, V1>, A> {};
template<int V0, int V1>
struct vals_client<vals<V0, V1>, void> {};
void testfn()
{
vals_client<vals<1, 2>, int> ci; //- OK
vals_client<vals<1, 2>, void> cv; //- "sorry, unimplemented..., ICE"
}
---------------------------------------------------------------------------
When compiled with gcc 11.X generates this error:
nttp_test.cpp: In function 'void testfn()':
nttp_test.cpp:18:36: sorry, unimplemented: unexpected AST of kind
nontype_argument_pack
18 | vals_client<vals<1, 2>, void> cv; //- "sorry, unimplemented..."
| ^~
nttp_test.cpp:18: confused by earlier errors, bailing out
---------------------------------------------------------------------------
When compiled with gcc trunk on godbolt.org, it elicits an ICE:
<source>: In function 'void testfn()':
<source>:23:36: sorry, unimplemented: unexpected AST of kind
nontype_argument_pack
23 | vals_client<vals<1, 2>, void> cv; //- "sorry, unimplemented...,
ICE"
| ^~
<source>:23:36: internal compiler error: in potential_constant_expression_1, at
cp/constexpr.c:9051
0x1fe73f9 internal_error(char const*, ...)
???:0
0x7d40a7 fancy_abort(char const*, int, char const*)
???:0
0x8475ff potential_constant_expression(tree_node*)
???:0
0xa21bd7 instantiation_dependent_expression_p(tree_node*)
???:0
0xa21c46 uses_template_parms(tree_node*)
???:0
0xa72888 most_specialized_partial_spec(tree_node*, int)
???:0
0xa7f834 instantiate_class_template(tree_node*)
???:0
0x89e107 start_decl_1(tree_node*, bool)
???:0
0x8c552f start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
???:0
0xa08395 c_parse_file()
???:0
0xb8f562 c_common_parse_file()
???:0
Please submit a full bug report, ...
---------------------------------------------------------------------------
Testing with various version on godbolt.org reveals that the ICE does not
occur with 10.X, 9.X, 8.X, or 7.X (that's as far back as I went).
next reply other threads:[~2021-09-30 16:09 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-30 16:09 bob.steagall.cpp at gmail dot com [this message]
2021-09-30 19:16 ` [Bug c++/102547] " ppalka at gcc dot gnu.org
2021-09-30 19:39 ` ppalka at gcc dot gnu.org
2021-09-30 19:41 ` [Bug c++/102547] [11/12 Regression] " ppalka at gcc dot gnu.org
2021-09-30 19:58 ` ppalka at gcc dot gnu.org
2021-09-30 21:35 ` bob.steagall.cpp at gmail dot com
2021-10-01 6:31 ` rguenth at gcc dot gnu.org
2021-10-05 19:36 ` cvs-commit at gcc dot gnu.org
2021-10-05 19:43 ` ppalka at gcc dot gnu.org
2021-10-05 19:44 ` [Bug c++/102547] [11 " ppalka at gcc dot gnu.org
2021-10-06 14:15 ` cvs-commit at gcc dot gnu.org
2021-10-06 14:21 ` ppalka at gcc dot gnu.org
2021-10-29 19:43 ` ppalka at gcc dot gnu.org
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