https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90548
Bug ID: 90548
Summary: [9/10 Regression] ICE in tsubst_copy_and_build, at
cp/pt.c:18877
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
This changed between 20190127 and 20190203 :
$ cat z1.cc
struct S { S (void ()); }
foo ([] (auto ...) {});
$ g++-9-20190127 -c z1.cc
$
$ g++-10-20190519 -c z1.cc
z1.cc: In instantiation of 'static decltype (((const<lambda(auto:1
...)>*)0)->operator()<auto:1
...>(static_cast<auto:1&>(__lambda0::_FUN::<unnamed>) ...))<lambda(auto:1
...)>::_FUN(auto:1 ...) [with auto:1 = {}; decltype (((const<lambda(auto:1
...)>*)0)->operator()<auto:1
...>(static_cast<auto:1&>(__lambda0::_FUN::<unnamed>) ...)) = void]':
z1.cc:2:21: required from '<lambda(auto:1 ...)>::operator decltype
(((const<lambda(auto:1 ...)>*)0)->operator()<auto:1
...>(static_cast<auto:1&>(__lambda0::_FUN::<unnamed>) ...)) (*)(auto:1 ...)()
const [with auto:1 = {}; decltype (((const<lambda(auto:1
...)>*)0)->operator()<auto:1
...>(static_cast<auto:1&>(__lambda0::_FUN::<unnamed>) ...)) = void]'
z1.cc:2:22: required from here
z1.cc:2:21: internal compiler error: Segmentation fault
2 | foo ([] (auto ...) {});
| ^
0xb8ae7f crash_signal
../../gcc/toplev.c:326
0x6dd614 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/cp/pt.c:18877
0x6e6609 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/cp/pt.c:18242
0x6e6609 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:17918
0x6e557a tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:17034
0x6e6291 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:17325
0x6e4764 instantiate_decl(tree_node*, bool, bool)
../../gcc/cp/pt.c:24755
0x6f9a0b instantiate_pending_templates(int)
../../gcc/cp/pt.c:24871
0x651755 c_parse_final_cleanups()
../../gcc/cp/decl2.c:4819
