MDEV-220 MariaDB server 5.5 GA candidate has default storage engine MyISAM

config.h.cmake

@@ -589,6 +589,8 @@
 #cmakedefine WITH_MYISAM_STORAGE_ENGINE 1
 #cmakedefine WITH_MYISAMMRG_STORAGE_ENGINE 1
 #cmakedefine WITH_HEAP_STORAGE_ENGINE 1
+#cmakedefine WITH_INNOBASE_STORAGE_ENGINE 1
+#cmakedefine WITH_XTRADB_STORAGE_ENGINE 1
 #cmakedefine WITH_CSV_STORAGE_ENGINE 1
 #cmakedefine WITH_PARTITION_STORAGE_ENGINE 1
 #cmakedefine WITH_PERFSCHEMA_STORAGE_ENGINE 1

mysql-test/include/default_mysqld.cnf

@@ -60,6 +60,8 @@ loose-performance-schema-max-table-handles=1000
 
 binlog-direct-non-transactional-updates
 
+default-storage-engine=myisam
+
 # here, at the end of [mysqld] group mtr will automatically disable
 # all optional plugins.
 

mysql-test/r/default_storage_engine.result

@@ -0,0 +1 @@
+"all ok"

mysql-test/t/default_storage_engine.test

@@ -0,0 +1,16 @@
+if (`SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME = 'innodb' AND PLUGIN_LIBRARY IS NULL`)
+{
+  --skip Requires built-in InnoDB.
+}
+
+let $cmd=`select replace("$MYSQLD_BOOTSTRAP_CMD", " --default-storage-engine=myisam", "")`;
+
+#
+# Now it *must* fail, because if InnoDB is compiled in, it is used as a default
+# storage engine. but $MYSQLD_BOOTSTRAP_CMD includes --skip-innodb
+#
+error 1;
+exec $cmd;
+
+echo "all ok"; # to not have zero-length result file
+

sql/mysqld.cc

@@ -3491,10 +3491,10 @@ static int init_common_variables()
     (except in the embedded server, where the default continues to
     be MyISAM)
   */
-#ifndef WITH_INNOBASE_STORAGE_ENGINE
+#if defined(WITH_INNOBASE_STORAGE_ENGINE) || defined(WITH_XTRADB_STORAGE_ENGINE)
-  default_storage_engine= const_cast<char *>("MyISAM");
-#else
   default_storage_engine= const_cast<char *>("InnoDB");
+#else
+  default_storage_engine= const_cast<char *>("MyISAM");
 #endif
 
   /*