MDEV-5220 - [PATCH] MariaDB 10.0.4 doesn't compile without perfschema

Fixed the following compilation errors and test failures:
- maria SE: "stage_waiting_for_a_resource" wasn't declared w/o PFS
- sql_repl.h: PSI_mutex_key is not available in non-PFS builds
- mysqld.cc: pfs_param is not available in non-PFS builds
- mysqld.cc: init_show_explain_psi_keys() is not available in non-PFS builds
- mysqld.cc: call net_before_header_psi, net_after_header_psi even if PFS
  is not available so that thread enters stage_init at proper time. Fixes
  sp-threads and a few tests in funcs_1.
- myisam_file_io.opt: added missing loose prefix

mysql-test/suite/perfschema/t/myisam_file_io.opt

---performance_schema_events_waits_history_long_size=5000
+--loose-performance_schema_events_waits_history_long_size=5000

sql/my_apc.h

@@ -134,6 +134,8 @@ private:
 
 #ifdef HAVE_PSI_INTERFACE
 void init_show_explain_psi_keys(void);
+#else
+#define init_show_explain_psi_keys() /* no-op */
 #endif
 
 #endif //SQL_MY_APC_INCLUDED

sql/mysqld.cc

@@ -758,8 +758,9 @@ static char **remaining_argv;
 int orig_argc;
 char **orig_argv;
 
-static struct my_option pfs_early_options[] __attribute__((unused)) =
+static struct my_option pfs_early_options[]=
 {
+#ifdef WITH_PERFSCHEMA_STORAGE_ENGINE
   {"performance_schema_instrument", OPT_PFS_INSTRUMENT,
     "Default startup value for a performance schema instrument.",
     &pfs_param.m_pfs_instrument, &pfs_param.m_pfs_instrument, 0, GET_STR,
@@ -824,6 +825,7 @@ static struct my_option pfs_early_options[] __attribute__((unused)) =
     &pfs_param.m_consumer_statement_digest_enabled,
     &pfs_param.m_consumer_statement_digest_enabled, 0,
     GET_BOOL, OPT_ARG, TRUE, 0, 0, 0, 0, 0}
+#endif /* WITH_PERFSCHEMA_STORAGE_ENGINE */
 };
 
 #ifdef HAVE_PSI_INTERFACE
@@ -1146,7 +1148,6 @@ void net_after_header_psi(struct st_net *net, void *user_data, size_t /* unused:
 
 void init_net_server_extension(THD *thd)
 {
-#ifdef HAVE_PSI_INTERFACE
   /* Start with a clean state for connection events. */
   thd->m_idle_psi= NULL;
   thd->m_statement_psi= NULL;
@@ -1157,9 +1158,6 @@ void init_net_server_extension(THD *thd)
   thd->m_net_server_extension.m_after_header= net_after_header_psi;
   /* Activate this private extension for the mysqld server. */
   thd->net.extension= & thd->m_net_server_extension;
-#else
-  thd->net.extension= NULL;
-#endif
 }
 #endif /* EMBEDDED_LIBRARY */
 
@@ -5137,9 +5135,11 @@ int mysqld_main(int argc, char **argv)
   buffered_logs.init();
   my_getopt_error_reporter= buffered_option_error_reporter;
   my_charset_error_reporter= buffered_option_error_reporter;
+#ifdef WITH_PERFSCHEMA_STORAGE_ENGINE
   pfs_param.m_pfs_instrument= const_cast<char*>("");
+#endif /* WITH_PERFSCHEMA_STORAGE_ENGINE */
 
-  int ho_error= handle_early_options();
+  int ho_error __attribute__((unused))= handle_early_options();
 
 #ifdef WITH_PERFSCHEMA_STORAGE_ENGINE
   if (ho_error == 0)

sql/sql_repl.h

@@ -67,7 +67,9 @@ int log_loaded_block(IO_CACHE* file);
 int init_replication_sys_vars();
 void mysql_binlog_send(THD* thd, char* log_ident, my_off_t pos, ushort flags);
 
+#ifdef HAVE_PSI_INTERFACE
 extern PSI_mutex_key key_LOCK_slave_state, key_LOCK_binlog_state;
+#endif
 void rpl_init_gtid_slave_state();
 void rpl_deinit_gtid_slave_state();
 int gtid_state_from_binlog_pos(const char *name, uint32 pos, String *out_str);

storage/maria/ma_static.c

@@ -146,6 +146,7 @@ PSI_thread_key key_thread_checkpoint, key_thread_find_all_keys,
 PSI_file_key key_file_translog, key_file_kfile, key_file_dfile,
              key_file_control, key_file_tmp;
 
-PSI_stage_info stage_waiting_for_a_resource= { 0, "Waiting for a resource", 0};
-
 #endif /* HAVE_PSI_INTERFACE */
+
+/* Note that PSI_stage_info globals must always be declared. */
+PSI_stage_info stage_waiting_for_a_resource= { 0, "Waiting for a resource", 0};

storage/maria/maria_def.h

@@ -930,10 +930,11 @@ extern PSI_thread_key key_thread_checkpoint, key_thread_find_all_keys,
 extern PSI_file_key key_file_translog, key_file_kfile, key_file_dfile,
                     key_file_control, key_file_tmp;
 
-extern PSI_stage_info stage_waiting_for_a_resource;
-
 #endif
 
+/* Note that PSI_stage_info globals must always be declared. */
+extern PSI_stage_info stage_waiting_for_a_resource;
+
 /* This is used by _ma_calc_xxx_key_length och _ma_store_key */
 typedef struct st_maria_s_param
 {