gcc/cp/search.c

1917   tree over_return = fndecl_declared_return_type (overrider);
1925   if (same_type_p (base_return, over_return))
1927   else if ((CLASS_TYPE_P (over_return) && CLASS_TYPE_P (base_return))
1928 	   || (TREE_CODE (base_return) == TREE_CODE (over_return)
1937 	  fail = cp_type_quals (base_return) != cp_type_quals (over_return);
1940 	  over_return = TREE_TYPE (over_return);
1943       over_quals = cp_type_quals (over_return);
1948       if (CLASS_TYPE_P (base_return) && CLASS_TYPE_P (over_return))
1954 							  over_return))
1956 	      tree binfo = lookup_base (over_return, base_return,