Merge with 3.23 to get patch for floor()

BitKeeper/etc/logging_ok:
  auto-union
myisam/mi_check.c:
  Auto merged
mysql-test/r/func_math.result:
  Auto merged
mysql-test/t/func_math.test:
  Auto merged
sql/item_func.cc:
  Auto merged

libmysql/libmysql.c

@@ -2112,8 +2112,8 @@ static my_bool mysql_reconnect(MYSQL *mysql)
   {
    /* Allow reconnect next time */
     mysql->server_status&= ~SERVER_STATUS_IN_TRANS;
-    mysql->net.last_errno=CR_SERVER_GONE_ERROR;
-    strmov(mysql->net.last_error,ER(mysql->net.last_errno));
+    mysql->net.last_errno= CR_SERVER_GONE_ERROR;
+    strmov(mysql->net.last_error, ER(mysql->net.last_errno));
     DBUG_RETURN(1);
   }
   mysql_init(&tmp_mysql);

myisam/mi_check.c

@@ -112,7 +112,9 @@ int chk_status(MI_CHECK *param, register MI_INFO *info)
     /* Don't count this as a real warning, as check can correct this ! */
     uint save=param->warning_printed;
     mi_check_print_warning(param,
-			   "%d clients is using or hasn't closed the table properly",
+			   share->state.open_count==1 ? 
+			   "%d client is using or hasn't closed the table properly" : 
+			   "%d clients are using or haven't closed the table properly",
 			   share->state.open_count);
     /* If this will be fixed by the check, forget the warning */
     if (param->testflag & T_UPDATE_STATE)

mysql-test/r/func_math.result

@@ -59,3 +59,9 @@ ASIN(0.8+0.2)
 SELECT ASIN(1.2-0.2);
 ASIN(1.2-0.2)
 1.570796
+floor(log(4)/log(2))
+2
+floor(log(8)/log(2))
+3
+floor(log(16)/log(2))
+4

mysql-test/t/func_math.test

@@ -28,3 +28,11 @@ SELECT ACOS(0.2*5.0);
 SELECT ACOS(0.5*2.0);
 SELECT ASIN(0.8+0.2);
 SELECT ASIN(1.2-0.2);
+
+#
+# Bug #3051 FLOOR returns invalid 
+#
+
+select floor(log(4)/log(2));
+select floor(log(8)/log(2));
+select floor(log(16)/log(2));

sql/item_func.cc

@@ -667,7 +667,8 @@ longlong Item_func_ceiling::val_int()
 
 longlong Item_func_floor::val_int()
 {
-  double value=args[0]->val();
+  // the volatile's for BUG #3051 to calm optimizer down (because of gcc's bug)
+  volatile double value=args[0]->val();
   null_value=args[0]->null_value;
   return (longlong) floor(value);
 }