Bug#45288: pb2 returns a lot of compilation warnings on linux

Fix compiler warnings due to: a mismatch in the prototypes for
check_access and implicit conversions from double to ulonglong
and vice-versa.

mysys/my_getopt.c:
  Explicit conversion from ulonglong to double. Might need to
  be tweaked in the future.
sql/sql_parse.h:
  Make prototype equal to the case when not compiling under embedded.
sql/sys_vars.cc:
  Explicit conversion from ulonglong to double. Destination var
  is a ulonglong.
sql/sys_vars.h:
  Explicit conversion from ulonglong to double. Might need to
  be tweaked in the future.

mysys/my_getopt.c

@@ -1032,7 +1032,7 @@ static void init_one_value(const struct my_option *option, void *variable,
     *((ulonglong*) variable)= (ulonglong) value;
     break;
   case GET_DOUBLE:
-    *((double*) variable)=  (double) value;
+    *((double*) variable)= ulonglong2double(value);
     break;
   case GET_STR:
     /*

sql/sql_parse.h

@@ -183,9 +183,8 @@ inline bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *table_list)
 inline bool check_some_routine_access(THD *thd, const char *db,
                                       const char *name, bool is_proc)
 { return false; }
-inline bool check_access(THD *thd, ulong access, const char *db,
-                         ulong *save_priv, bool no_grant, bool no_errors,
-                         bool schema_db)
+inline bool check_access(THD *, ulong, const char *, ulong *save_priv,
+                         GRANT_INTERNAL_INFO *, bool, bool)
 {
   if (save_priv)
     *save_priv= GLOBAL_ACLS;

sql/sys_vars.cc

@@ -942,10 +942,10 @@ static bool update_cached_long_query_time(sys_var *self, THD *thd,
 {
   if (type == OPT_SESSION)
     thd->variables.long_query_time=
-      thd->variables.long_query_time_double * 1e6;
+      double2ulonglong(thd->variables.long_query_time_double * 1e6);
   else
     global_system_variables.long_query_time=
-      global_system_variables.long_query_time_double * 1e6;
+      double2ulonglong(global_system_variables.long_query_time_double * 1e6);
   return false;
 }
 

sql/sys_vars.h

@@ -741,13 +741,13 @@ class Sys_var_double: public sys_var
           uint deprecated_version=0, const char *substitute=0,
           int parse_flag= PARSE_NORMAL)
     : sys_var(&all_sys_vars, name_arg, comment, flag_args, off, getopt.id,
-              getopt.arg_type, SHOW_DOUBLE, def_val, lock, binlog_status_arg,
-              on_check_func, on_update_func, deprecated_version, substitute,
-              parse_flag)
+              getopt.arg_type, SHOW_DOUBLE, (longlong) double2ulonglong(def_val),
+              lock, binlog_status_arg, on_check_func, on_update_func,
+              deprecated_version, substitute, parse_flag)
   {
     option.var_type= GET_DOUBLE;
-    option.min_value= min_val;
-    option.max_value= max_val;
+    option.min_value= (longlong) double2ulonglong(min_val);
+    option.max_value= (longlong) double2ulonglong(max_val);
     global_var(double)= (double)option.def_value;
     DBUG_ASSERT(min_val < max_val);
     DBUG_ASSERT(min_val <= def_val);