[Bug c++/101098] New: [11/12 Regression] ICE in instantiate_body, at cp/pt.c:25858
gscfq@t-online.de
gcc-bugzilla@gcc.gnu.org
Wed Jun 16 17:19:34 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101098
Bug ID: 101098
Summary: [11/12 Regression] ICE in instantiate_body, at
cp/pt.c:25858
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gscfq@t-online.de
Target Milestone: ---
Changed between 20200621 and 20200628, r9 accepts it.
With option -fconcepts and file g++.dg/cpp2a/concepts-explicit-spec1.C
or the following variant :
$ cat z1.cc
template<typename T> concept C = __is_class(T);
struct Y { int n; } y;
template<C T> void g(T) { }
int called;
template<> void g(Y) { called = 3; }
int main() { g(y); }
$ g++-9 -c z1.cc -fconcepts
$
$ g++-12-20210613 -c z1.cc -fconcepts
z1.cc: In instantiation of 'void g(T) [with T = Y]':
z1.cc:6:15: required from here
z1.cc:3:27: internal compiler error: Segmentation fault
3 | template<C T> void g(T) { }
| ^
0xd4d42f crash_signal
../../gcc/toplev.c:327
0x822254 instantiate_body
../../gcc/cp/pt.c:25858
0x823223 instantiate_decl(tree_node*, bool, bool)
../../gcc/cp/pt.c:26141
0x83d9eb instantiate_pending_templates(int)
../../gcc/cp/pt.c:26220
0x752232 c_parse_final_cleanups()
../../gcc/cp/decl2.c:4966
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