MDEV-12824 GCC 7 warning: this statement may fall through [-Wimplicit-fallthrough=]

sql-common/client.c

@@ -1148,6 +1148,7 @@ void mysql_read_default_options(struct st_mysql_options *options,
 	  break;
         case OPT_pipe:
           options->protocol = MYSQL_PROTOCOL_PIPE;
+	  break;
         case OPT_connect_timeout: 
 	case OPT_timeout:
 	  if (opt_arg)

sql/item_func.cc

@@ -848,8 +848,9 @@ void Item_func_num1::fix_length_and_dec()
 {
   DBUG_ENTER("Item_func_num1::fix_length_and_dec");
   DBUG_PRINT("info", ("name %s", func_name()));
-  switch (cached_result_type= args[0]->cast_to_int_type()) {
+  switch (args[0]->cast_to_int_type()) {
   case INT_RESULT:
+    cached_result_type= INT_RESULT;
     max_length= args[0]->max_length;
     unsigned_flag= args[0]->unsigned_flag;
     break;
@@ -860,8 +861,8 @@ void Item_func_num1::fix_length_and_dec()
     max_length= float_length(decimals);
     break;
   case TIME_RESULT:
-    cached_result_type= DECIMAL_RESULT;
   case DECIMAL_RESULT:
+    cached_result_type= DECIMAL_RESULT;
     decimals= args[0]->decimal_scale(); // Do not preserve NOT_FIXED_DEC
     max_length= args[0]->max_length;
     break;

sql/log.cc

@@ -9405,8 +9405,8 @@ int TC_LOG_BINLOG::recover(LOG_INFO *linfo, const char *last_log_name,
                                           sizeof(xev->xid));
           if (!x || my_hash_insert(&xids, x))
             goto err2;
-          break;
         }
+        break;
       }
       case BINLOG_CHECKPOINT_EVENT:
         if (first_round && do_xa)

sql/sql_repl.cc

@@ -2665,6 +2665,7 @@ impossible position";
           loop_breaker = (flags & BINLOG_DUMP_NON_BLOCK);
           break;
         }
+        /* fall through */
       default:
 	errmsg = "could not find next log";
 	my_errno= ER_MASTER_FATAL_ERROR_READING_BINLOG;

storage/federated/ha_federated.cc

@@ -1423,6 +1423,7 @@ bool ha_federated::create_where_from_key(String *to,
           }
           break;
         }
+        /* fall through */
       case HA_READ_KEY_OR_NEXT:
         DBUG_PRINT("info", ("federated HA_READ_KEY_OR_NEXT %d", i));
         if (emit_key_part_name(&tmp, key_part) ||
@@ -1442,6 +1443,7 @@ bool ha_federated::create_where_from_key(String *to,
             goto err;
           break;
         }
+        /* fall through */
       case HA_READ_KEY_OR_PREV:
         DBUG_PRINT("info", ("federated HA_READ_KEY_OR_PREV %d", i));
         if (emit_key_part_name(&tmp, key_part) ||

storage/federatedx/ha_federatedx.cc

@@ -1342,6 +1342,7 @@ bool ha_federatedx::create_where_from_key(String *to,
           }
           break;
         }
+        /* fall through */
       case HA_READ_KEY_OR_NEXT:
         DBUG_PRINT("info", ("federatedx HA_READ_KEY_OR_NEXT %d", i));
         if (emit_key_part_name(&tmp, key_part) ||
@@ -1361,6 +1362,7 @@ bool ha_federatedx::create_where_from_key(String *to,
             goto err;
           break;
         }
+        /* fall through */
       case HA_READ_KEY_OR_PREV:
         DBUG_PRINT("info", ("federatedx HA_READ_KEY_OR_PREV %d", i));
         if (emit_key_part_name(&tmp, key_part) ||

storage/heap/hp_extra.c

@@ -34,6 +34,7 @@ int heap_extra(register HP_INFO *info, enum ha_extra_function function)
   switch (function) {
   case HA_EXTRA_RESET_STATE:
     heap_reset(info);
+    /* fall through */
   case HA_EXTRA_NO_READCHECK:
     info->opt_flag&= ~READ_CHECK_USED;	/* No readcheck */
     break;

storage/maria/ma_key_recover.c

@@ -1169,6 +1169,7 @@ uint _ma_apply_redo_index(MARIA_HA *info,
         goto err;
       }
       page_length= page.size;
+      break;
     }
     case KEY_OP_NONE:
     default: