https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71169
Bug ID: 71169
Summary: [7 Regression] ICE on invalid C++ code in
pop_nested_class (cp/class.c:7785)
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
Hi.
Follow code was created during reduction of a different problem:
$ cat invalid.cc
template <Preconditioner> class A {
template <class = int> m_fn1() {
m_fn1()
}
}
$ invalid.cc:1:11: error: ‘Preconditioner’ has not been declared
template <Preconditioner> class A {
^~~~~~~~~~~~~~
invalid.cc:2:32: error: ISO C++ forbids declaration of ‘m_fn1’ with no type
[-fpermissive]
template <class = int> m_fn1() {
^
invalid.cc:5:1: error: expected ‘;’ after class definition
}
^
invalid.cc: In substitution of ‘template<<typeprefixerror><anonymous> >
template<class> int A<<anonymous> >::m_fn1() [with <template-parameter-2-1> =
<missing>; <typeprefixerror><anonymous> = int]’:
invalid.cc:3:9: required from here
invalid.cc:3:9: internal compiler error: Segmentation fault
m_fn1()
^
0xd7d93f crash_signal
../../gcc/toplev.c:333
0x731f03 tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
../../gcc/tree.h:3147
0x731f03 pop_nested_class()
../../gcc/cp/class.c:7785
0x6f6ede instantiate_template_1
../../gcc/cp/pt.c:17400
0x6f6ede instantiate_template(tree_node*, tree_node*, int)
../../gcc/cp/pt.c:17449
0x7084d7 fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, bool, bool)
../../gcc/cp/pt.c:17808
0x66ddd0 add_template_candidate_real
../../gcc/cp/call.c:3110
0x66eb2c add_template_candidate
../../gcc/cp/call.c:3188
0x66eb2c add_candidates
../../gcc/cp/call.c:5361
0x66f3af build_new_method_call_1
../../gcc/cp/call.c:8312
0x66f3af build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
../../gcc/cp/call.c:8511
0x784522 cp_parser_postfix_expression
../../gcc/cp/parser.c:6875
0x78205c cp_parser_unary_expression
../../gcc/cp/parser.c:7986
0x78c097 cp_parser_cast_expression
../../gcc/cp/parser.c:8663
0x78c65b cp_parser_binary_expression
../../gcc/cp/parser.c:8764
0x78cf20 cp_parser_assignment_expression
../../gcc/cp/parser.c:9051
0x78f84a cp_parser_expression
../../gcc/cp/parser.c:9220
0x78fdf3 cp_parser_expression_statement
../../gcc/cp/parser.c:10681
0x79f156 cp_parser_statement
../../gcc/cp/parser.c:10532
0x79fb3c cp_parser_statement_seq_opt
../../gcc/cp/parser.c:10804
GCC 6.1 works fine.
Martin
