Improve error messages

- mysql_install_db now prints position to error file, if log-error is used
- Warning about compatibility now mentions MySQL 5.6 and 5.7
- Give warning if --show_compatibility_56 is used

mysql-test/mysql-test-run.pl

@@ -4418,7 +4418,7 @@ sub extract_warning_lines ($$) {
      qr|feedback plugin: failed to retrieve the MAC address|,
      qr|Plugin 'FEEDBACK' init function returned error|,
      qr|Plugin 'FEEDBACK' registration as a INFORMATION SCHEMA failed|,
-     qr|'log-bin-use-v1-row-events' is MySQL 5.6 compatible option|,
+     qr|'log-bin-use-v1-row-events' is MySQL .* compatible option|,
      qr|InnoDB: Setting thread \d+ nice to \d+ failed, current nice \d+, errno 13|, # setpriority() fails under valgrind
      qr|Failed to setup SSL|,
      qr|SSL error: Failed to set ciphers to use|,

scripts/mysql_install_db.sh

@@ -24,6 +24,7 @@ builddir=""
 ldata="@localstatedir@"
 langdir=""
 srcdir=""
+log_error=""
 
 args=""
 defaults=""
@@ -136,6 +137,8 @@ parse_arguments()
       --builddir=*) builddir=`parse_arg "$arg"` ;;
       --srcdir=*)  srcdir=`parse_arg "$arg"` ;;
       --ldata=*|--datadir=*|--data=*) ldata=`parse_arg "$arg"` ;;
+      --log-error=*)
+       log_error=`parse_arg "$arg"` ;;
       --user=*)
         # Note that the user will be passed to mysqld so that it runs
         # as 'user' (crucial e.g. if log-bin=/some_other_path/
@@ -147,7 +150,6 @@ parse_arguments()
       --help) usage ;;
       --no-defaults|--defaults-file=*|--defaults-extra-file=*)
         defaults="$arg" ;;
-
       --cross-bootstrap|--windows)
         # Used when building the MariaDB system tables on a different host than
         # the target. The platform-independent files that are created in
@@ -475,9 +477,14 @@ if { echo "use mysql;$install_params"; cat "$create_system_tables" "$create_syst
 then
   s_echo "OK"
 else
+  log_file_place=$ldata
+  if test -n "$log_error"
+  then
+    log_file_place="$log_error or $log_file_place"
+  fi
   echo
   echo "Installation of system tables failed!  Examine the logs in"
-  echo "$ldata for more information."
+  echo "$log_file_place for more information."
   echo
   echo "The problem could be conflicting information in an external"
   echo "my.cnf files. You can ignore these by doing:"

sql/mysqld.cc

@@ -7759,6 +7759,7 @@ struct my_option my_long_options[]=
   MYSQL_SUGGEST_ANALOG_OPTION("max-binlog-dump-events", "--debug-max-binlog-dump-events"),
   MYSQL_SUGGEST_ANALOG_OPTION("sporadic-binlog-dump-fail", "--debug-sporadic-binlog-dump-fail"),
   MYSQL_COMPATIBILITY_OPTION("new"),
+  MYSQL_COMPATIBILITY_OPTION("show_compatibility_56"),
 
   /* The following options were added after 5.6.10 */
   MYSQL_TO_BE_IMPLEMENTED_OPTION("rpl-stop-slave-timeout"),
@@ -9044,12 +9045,12 @@ mysqld_get_one_option(int optid, const struct my_option *opt, char *argument)
                       opt->name);
     break;
   case OPT_MYSQL_COMPATIBILITY:
-    sql_print_warning("'%s' is MySQL 5.6 compatible option. Not used or needed "
-                      "in MariaDB.", opt->name);
+    sql_print_warning("'%s' is MySQL 5.6 / 5.7 compatible option. Not used or "
+                      "needed in MariaDB.", opt->name);
     break;
   case OPT_MYSQL_TO_BE_IMPLEMENTED:
-    sql_print_warning("'%s' is MySQL 5.6 compatible option. To be implemented "
-                      "in later versions.", opt->name);
+    sql_print_warning("'%s' is MySQL 5.6 / 5.7 compatible option. To be "
+                      "implemented in later versions.", opt->name);
     break;
   case 'a':
     SYSVAR_AUTOSIZE(global_system_variables.sql_mode, MODE_ANSI);