select @@smth=@@sys_str_var crash fixed

mysql-test/r/variables.result:
  new test
mysql-test/t/ctype_utf8.test:
  typos fixed
mysql-test/t/variables.test:
  new test
sql/mysqld.cc:
  sys_str_var->value must be not NULL
sql/set_var.cc:
  initialize sys_str_var->value from a constructor
sql/set_var.h:
  initialize sys_str_var->value from a constructor

mysql-test/r/variables.result

@@ -382,6 +382,8 @@ select 1;
 1
 select @@session.key_buffer_size;
 ERROR HY000: Variable 'key_buffer_size' is a GLOBAL variable
+set ft_boolean_syntax = @@init_connect;
+ERROR HY000: Variable 'ft_boolean_syntax' is a GLOBAL variable and should be set with SET GLOBAL
 select @@global.max_user_connections,@@local.max_join_size;
 @@global.max_user_connections	@@session.max_join_size
 100	200

mysql-test/t/ctype_utf8.test

@@ -54,7 +54,7 @@ select * from t1;
 drop table t1;
 
 #
-# Bug #2366  	Wrong utf8 behaviour when data is trancated
+# Bug #2366  	Wrong utf8 behaviour when data is truncated
 #
 set names koi8r;
 create table t1 (s1 char(1) character set utf8);
@@ -101,7 +101,7 @@ drop table t1;
 
 #
 # Bug 2699
-# UTF8 breaks primary keys for cols > 85 characters
+# UTF8 breaks primary keys for cols > 333 characters
 #
 --error 1071
 create table t1 (a text character set utf8, primary key(a(360)));

mysql-test/t/variables.test

@@ -270,6 +270,9 @@ select 1;
 --error 1238
 select @@session.key_buffer_size;
 
+--error 1229
+set ft_boolean_syntax = @@init_connect;
+
 #
 # swap
 #

sql/mysqld.cc

@@ -2189,10 +2189,14 @@ static int init_common_variables(const char *conf_file_name, int argc,
   sys_init_connect.value_length= 0;
   if ((sys_init_connect.value= opt_init_connect))
     sys_init_connect.value_length= strlen(opt_init_connect);
+  else
+    sys_init_connect.value=my_strdup("",MYF(0));
 
   sys_init_slave.value_length= 0;
   if ((sys_init_slave.value= opt_init_slave))
     sys_init_slave.value_length= strlen(opt_init_slave);
+  else
+    sys_init_slave.value=my_strdup("",MYF(0));
 
   if (use_temp_pool && bitmap_init(&temp_pool,0,1024,1))
     return 1;

sql/set_var.cc

@@ -121,7 +121,8 @@ sys_var_character_set_server	sys_character_set_server("character_set_server");
 sys_var_str			sys_charset_system("character_set_system",
 				    sys_check_charset,
 				    sys_update_charset,
-				    sys_set_default_charset);
+				    sys_set_default_charset,
+                                    (char *)my_charset_utf8_general_ci.name);
 sys_var_character_set_database	sys_character_set_database("character_set_database");
 sys_var_character_set_client  sys_character_set_client("character_set_client");
 sys_var_character_set_connection  sys_character_set_connection("character_set_connection");
@@ -150,13 +151,14 @@ sys_var_long_ptr	sys_flush_time("flush_time", &flush_time);
 sys_var_str             sys_ft_boolean_syntax("ft_boolean_syntax",
                                          sys_check_ftb_syntax,
                                          sys_update_ftb_syntax,
-                                         sys_default_ftb_syntax);
+                                         sys_default_ftb_syntax,
+                                         ft_boolean_syntax);
 sys_var_str             sys_init_connect("init_connect", 0,
                                          sys_update_init_connect,
-                                         sys_default_init_connect);
+                                         sys_default_init_connect,0);
 sys_var_str             sys_init_slave("init_slave", 0,
                                        sys_update_init_slave,
-                                       sys_default_init_slave);
+                                       sys_default_init_slave,0);
 sys_var_thd_ulong	sys_interactive_timeout("interactive_timeout",
 						&SV::net_interactive_timeout);
 sys_var_thd_ulong	sys_join_buffer_size("join_buffer_size",

sql/set_var.h

@@ -139,8 +139,9 @@ class sys_var_str :public sys_var
   sys_var_str(const char *name_arg,
 	      sys_check_func check_func_arg,
 	      sys_update_func update_func_arg,
-	      sys_set_default_func set_default_func_arg)
-    :sys_var(name_arg), check_func(check_func_arg),
+	      sys_set_default_func set_default_func_arg,
+              char *value_arg)
+    :sys_var(name_arg), check_func(check_func_arg), value(value_arg),
     update_func(update_func_arg),set_default_func(set_default_func_arg)
   {}
   bool check(THD *thd, set_var *var);