https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95838
--- Comment #1 from Matthias Klose <doko at debian dot org> ---
also seen with 20200623:
../watchdog.ii: In member function ‘void g::e()’:
../watchdog.ii:20:5: internal compiler error: Segmentation fault
20 | c()
| ^
0x12f56ac crash_signal
../../src/gcc/toplev.c:328
0x7f9e10e4f7ff ???
./signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x922806 lookup_vfn_in_binfo(tree_node*, tree_node*)
../../src/gcc/cp/class.c:2459
0x90f952 build_over_call
../../src/gcc/cp/call.c:8699
0x914077 build_new_method_call_1
../../src/gcc/cp/call.c:10357
0x914378 build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
../../src/gcc/cp/call.c:10432
0xa4e03c cp_parser_postfix_expression
../../src/gcc/cp/parser.c:7439
0xa50911 cp_parser_unary_expression
../../src/gcc/cp/parser.c:8563
0xa51ca3 cp_parser_cast_expression
../../src/gcc/cp/parser.c:9459
0xa51d90 cp_parser_binary_expression
../../src/gcc/cp/parser.c:9562
0xa52ac9 cp_parser_assignment_expression
../../src/gcc/cp/parser.c:9867
0xa52e66 cp_parser_expression
../../src/gcc/cp/parser.c:10035
0xa56481 cp_parser_expression_statement
../../src/gcc/cp/parser.c:11696
0xa55e3b cp_parser_statement
../../src/gcc/cp/parser.c:11492
0xa568dc cp_parser_statement_seq_opt
../../src/gcc/cp/parser.c:11843
0xa567c0 cp_parser_compound_statement
../../src/gcc/cp/parser.c:11793
0xa69a63 cp_parser_function_body
../../src/gcc/cp/parser.c:23074
0xa69bfd cp_parser_ctor_initializer_opt_and_function_body
../../src/gcc/cp/parser.c:23125
0xa73b20 cp_parser_function_definition_after_declarator
../../src/gcc/cp/parser.c:29016
0xa73947 cp_parser_function_definition_from_specifiers_and_declarator
../../src/gcc/cp/parser.c:28932
Please submit a full bug report,
with preprocessed source if appropriate.
