diff --git a/sql/log.cc b/sql/log.cc
index cb484210c50..c784dc1c308 100644
--- a/sql/log.cc
+++ b/sql/log.cc
@@ -10403,7 +10403,8 @@ binlog_checksum_update(MYSQL_THD thd, struct st_mysql_sys_var *var,
 }
 
 
-static int show_binlog_vars(THD *thd, SHOW_VAR *var, char *buff)
+static int show_binlog_vars(THD *thd, SHOW_VAR *var, void *,
+                            system_status_var *status_var, enum_var_type)
 {
   mysql_bin_log.set_status_variables(thd);
   var->type= SHOW_ARRAY;
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 4516e8ff596..ad0b1d9c000 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -8337,8 +8337,8 @@ show_ssl_get_server_not_after(THD *thd, SHOW_VAR *var, char *buff,
 
 #endif /* HAVE_OPENSSL && !EMBEDDED_LIBRARY */
 
-static int show_default_keycache(THD *thd, SHOW_VAR *var, char *buff,
-                                 enum enum_var_type scope)
+static int show_default_keycache(THD *thd, SHOW_VAR *var, void *buff,
+                                 system_status_var *, enum_var_type)
 {
   struct st_data {
     KEY_CACHE_STATISTICS stats;
@@ -8371,7 +8371,7 @@ static int show_default_keycache(THD *thd, SHOW_VAR *var, char *buff,
 
   v->name= 0;
 
-  DBUG_ASSERT((char*)(v+1) <= buff + SHOW_VAR_FUNC_BUFF_SIZE);
+  DBUG_ASSERT((char*)(v+1) <= static_cast<char*>(buff) + SHOW_VAR_FUNC_BUFF_SIZE);
 
 #undef set_one_keycache_var
 
@@ -8395,8 +8395,8 @@ static int show_memory_used(THD *thd, SHOW_VAR *var, char *buff,
 
 
 #ifndef DBUG_OFF
-static int debug_status_func(THD *thd, SHOW_VAR *var, char *buff,
-                             enum enum_var_type scope)
+static int debug_status_func(THD *thd, SHOW_VAR *var, void *buff,
+                             system_status_var *, enum_var_type)
 {
 #define add_var(X,Y,Z)                  \
   v->name= X;                           \
diff --git a/sql/wsrep_mysqld.h b/sql/wsrep_mysqld.h
index e28b90885b4..3d68eda0d6b 100644
--- a/sql/wsrep_mysqld.h
+++ b/sql/wsrep_mysqld.h
@@ -131,8 +131,8 @@ extern const char* wsrep_provider_name;
 extern const char* wsrep_provider_version;
 extern const char* wsrep_provider_vendor;
 
-int  wsrep_show_status(THD *thd, SHOW_VAR *var, char *buff,
-                       enum enum_var_type scope);
+int  wsrep_show_status(THD *thd, SHOW_VAR *var, void *buff,
+                       system_status_var *status_var, enum_var_type scope);
 int  wsrep_init();
 void wsrep_deinit(bool free_options);
 
diff --git a/sql/wsrep_var.cc b/sql/wsrep_var.cc
index 9777cc6ec62..45f929de9de 100644
--- a/sql/wsrep_var.cc
+++ b/sql/wsrep_var.cc
@@ -726,8 +726,8 @@ static int show_var_cmp(const void *var1, const void *var2)
   return strcasecmp(((SHOW_VAR*)var1)->name, ((SHOW_VAR*)var2)->name);
 }
 
-int wsrep_show_status (THD *thd, SHOW_VAR *var, char *buff,
-                       enum enum_var_type scope)
+int wsrep_show_status (THD *thd, SHOW_VAR *var, void *buff,
+                       system_status_var *, enum_var_type scope)
 {
   uint i, maxi= SHOW_VAR_FUNC_BUFF_SIZE / sizeof(*var) - 1;
   SHOW_VAR *v= (SHOW_VAR *)buff;