fixes for gcc 4.4.1 warnings

sql/mysql_priv.h:
  see change done in sys_vars.cc
sql/mysqld.cc:
  functions were defined all the time but not used if in libmysqld
sql/sql_select.cc:
  const_part is unsigned, 1<<etc is signed
sql/sql_yacc.yy:
  parenthesis
sql/sys_vars.cc:
  offsetof() gives warning for non-POD types, but it's said to be safe if the type only has a constructor (see definition
  of my_offsetof() for more info).

sql/mysql_priv.h

@@ -235,6 +235,7 @@ typedef struct my_locale_errmsgs
 
 extern char err_shared_dir[];
 
+/** @note Keep this a POD-type because we use offsetof() on it */
 typedef struct my_locale_st
 {
   uint  number;

sql/mysqld.cc

@@ -928,8 +928,6 @@ static bool add_terminator(DYNAMIC_ARRAY *options);
 extern "C" my_bool mysqld_get_one_option(int, const struct my_option *, char *);
 static void set_server_version(void);
 static int init_thread_environment();
-static void init_error_log_mutex();
-static void clean_up_error_log_mutex();
 static char *get_relative_path(const char *path);
 static int fix_paths(void);
 void handle_connections_sockets();
@@ -1346,6 +1344,18 @@ extern "C" sig_handler print_signal_warning(int sig)
 
 #ifndef EMBEDDED_LIBRARY
 
+static void init_error_log_mutex()
+{
+  mysql_mutex_init(key_LOCK_error_log, &LOCK_error_log, MY_MUTEX_INIT_FAST);
+}
+
+
+static void clean_up_error_log_mutex()
+{
+  mysql_mutex_destroy(&LOCK_error_log);
+}
+
+
 /**
   cleanup all memory and end program nicely.
 
@@ -3360,7 +3370,7 @@ static int init_common_variables()
     set the def_value member to 0 in my_long_options and initialize it
     to the correct value here.
   */
-  default_storage_engine="MyISAM";
+  default_storage_engine= const_cast<char *>("MyISAM");
 
   /*
     Add server status variables to the dynamic list of
@@ -3701,15 +3711,6 @@ You should consider changing lower_case_table_names to 1 or 2",
   return 0;
 }
 
-static void init_error_log_mutex()
-{
-  mysql_mutex_init(key_LOCK_error_log, &LOCK_error_log, MY_MUTEX_INIT_FAST);
-}
-
-static void clean_up_error_log_mutex()
-{
-  mysql_mutex_destroy(&LOCK_error_log);
-}
 
 static int init_thread_environment()
 {

sql/sql_select.cc

@@ -4378,7 +4378,7 @@ best_access_path(JOIN      *join,
               */
               if (table->quick_keys.is_set(key) &&
                   (const_part & ((1 << table->quick_key_parts[key])-1)) ==
-                  ((1 << table->quick_key_parts[key])-1) &&
+                  (((key_part_map)1 << table->quick_key_parts[key])-1) &&
                   table->quick_n_ranges[key] == 1 &&
                   records > (double) table->quick_rows[key])
               {

sql/sql_yacc.yy

@@ -9218,8 +9218,8 @@ table_factor:
               lex->pop_context();
               lex->nest_level--;
             }
-            else if ($3->select_lex &&
-                     $3->select_lex->master_unit()->is_union() || $5)
+            else if (($3->select_lex &&
+                     $3->select_lex->master_unit()->is_union()) || $5)
             {
               /* simple nested joins cannot have aliases or unions */
               my_parse_error(ER(ER_SYNTAX_ERROR));

sql/sys_vars.cc

@@ -2956,14 +2956,14 @@ static bool check_locale(sys_var *self, THD *thd, set_var *var)
 static Sys_var_struct Sys_lc_messages(
        "lc_messages", "Set the language used for the error messages",
        SESSION_VAR(lc_messages), NO_CMD_LINE,
-       offsetof(MY_LOCALE, name), DEFAULT(&my_default_lc_messages),
+       my_offsetof(MY_LOCALE, name), DEFAULT(&my_default_lc_messages),
        NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_locale));
 
 static Sys_var_struct Sys_lc_time_names(
        "lc_time_names", "Set the language used for the month "
        "names and the days of the week",
        SESSION_VAR(lc_time_names), NO_CMD_LINE,
-       offsetof(MY_LOCALE, name), DEFAULT(&my_default_lc_time_names),
+       my_offsetof(MY_LOCALE, name), DEFAULT(&my_default_lc_time_names),
        NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_locale));
 
 static Sys_var_tz Sys_time_zone(