[Bug c++/103114] [12 Regression] ICE in build_complex, at tree.c:2470 since r12-4764-ga84b9d5373c7e67f

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103114

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/cp/parser.c.jj  2021-10-28 20:07:48.571193189 +0200
+++ gcc/cp/parser.c     2021-11-08 10:18:02.042896144 +0100
@@ -4804,9 +4804,9 @@ cp_parser_userdef_numeric_literal (cp_pa
       else /* if (id_equal (suffix_id, "il")) */
        type = long_double_type_node;

-      value = build_complex (build_complex_type (type),
-                            fold_convert (type, integer_zero_node),
-                            fold_convert (type, value));
+      value = fold_build2 (COMPLEX_EXPR, build_complex_type (type),
+                          fold_convert (type, integer_zero_node),
+                          fold_convert (type, value));
     }

   if (cp_parser_uncommitted_to_tentative_parse_p (parser))
does that indeed, for the usual case it will do fold_binary_loc -> const_binop
-> build_complex.