WL#2936

  Fix compiler warnings,
  Fix help output - this fixes im test failures.
  Fix incomplete change of SET plugin vars to ulonglong.
  Allow ER() to work without crashing when errmsg.sys has not been loaded.


include/mysql/plugin.h:
  wl2936
    slip in const modifier for default values,
    this removes compiler warnings when assigning a string const as default value.
sql/derror.cc:
  WL2936
    Allow init_errmessage() to return upon failure.
    Initialize errmesg to an array of empty strings if it failed to load errmsg.sys
sql/mysqld.cc:
  wl2936
    Include Ingo's compiler-warnings fix.
    If init_errmessage() failed to load errmsg.sys, abort.
    Failure to set working directory not fatal when '--help' is specified, as
    server will terminate anyway after displaying help information.
sql/sql_plugin.cc:
  wl2936
    complete change of SET vars from ulong to ulonglong.

include/mysql/plugin.h

@@ -193,7 +193,8 @@ typedef void (*mysql_var_update_func)(MYSQL_THD thd,
 
 #define DECLARE_MYSQL_SYSVAR_BASIC(name, type) struct { \
   MYSQL_PLUGIN_VAR_HEADER;      \
-  type *value; type def_val;    \
+  type *value;                  \
+  const type def_val;           \
 } MYSQL_SYSVAR_NAME(name)
 
 #define DECLARE_MYSQL_SYSVAR_SIMPLE(name, type) struct { \
@@ -215,7 +216,7 @@ typedef void (*mysql_var_update_func)(MYSQL_THD thd,
 #define DECLARE_MYSQL_THDVAR_BASIC(name, type) struct { \
   MYSQL_PLUGIN_VAR_HEADER;      \
   int offset;                   \
-  type def_val;                 \
+  const type def_val;           \
   DECLARE_THDVAR_FUNC(type);    \
 } MYSQL_SYSVAR_NAME(name)
 

sql/derror.cc

@@ -31,6 +31,9 @@ static void init_myfunc_errs(void);
 
   DESCRIPTION
     This function can be called multiple times to reload the messages.
+	If it fails to load the messages, it will fail softly by initializing
+	the errmesg pointer to an array of empty strings or by keeping the
+	old array if it exists.
 
   RETURN
     FALSE       OK
@@ -39,7 +42,7 @@ static void init_myfunc_errs(void);
 
 bool init_errmessage(void)
 {
-  const char **errmsgs;
+  const char **errmsgs, **ptr;
   DBUG_ENTER("init_errmessage");
 
   /*
@@ -49,8 +52,15 @@ bool init_errmessage(void)
   errmsgs= my_error_unregister(ER_ERROR_FIRST, ER_ERROR_LAST);
 
   /* Read messages from file. */
-  if (read_texts(ERRMSG_FILE, &errmsgs, ER_ERROR_LAST - ER_ERROR_FIRST + 1))
+  if (read_texts(ERRMSG_FILE, &errmsgs, ER_ERROR_LAST - ER_ERROR_FIRST + 1) &&
+      !errmsgs)
+  {
+    if (!(errmsgs= (const char**) my_malloc((ER_ERROR_LAST-ER_ERROR_FIRST+1)*
+                                            sizeof(char*), MYF(0))))
       DBUG_RETURN(TRUE);
+    for (ptr= errmsgs; ptr < errmsgs + ER_ERROR_LAST - ER_ERROR_FIRST; ptr++)
+	  *ptr= "";
+  }
 
   /* Register messages for use with my_error(). */
   if (my_error_register(errmsgs, ER_ERROR_FIRST, ER_ERROR_LAST))
@@ -66,7 +76,6 @@ bool init_errmessage(void)
 
 
 	/* Read text from packed textfile in language-directory */
-	/* If we can't read messagefile then it's panic- we can't continue */
 
 static bool read_texts(const char *file_name,const char ***point,
 		       uint error_messages)
@@ -79,7 +88,6 @@ static bool read_texts(const char *file_name,const char ***point,
   uchar head[32],*pos;
   DBUG_ENTER("read_texts");
 
-  *point=0;					// If something goes wrong
   LINT_INIT(buff);
   funktpos=0;
   if ((file=my_open(fn_format(name,file_name,language,"",4),
@@ -119,7 +127,7 @@ but it should contain at least %d error messages.\n\
 Check that the above file is the right version for this program!",
 		    name,count,error_messages);
     VOID(my_close(file,MYF(MY_WME)));
-    unireg_abort(1);
+    DBUG_RETURN(1);
   }
 
   x_free((gptr) *point);		/* Free old language */
@@ -162,8 +170,7 @@ err:
 err1:
   if (file != FERR)
     VOID(my_close(file,MYF(MY_WME)));
-  unireg_abort(1);
-  DBUG_RETURN(1);					// keep compiler happy
+  DBUG_RETURN(1);
 } /* read_texts */
 
 

sql/mysqld.cc

@@ -1331,6 +1331,7 @@ static void clean_up_mutexes()
 ** Init IP and UNIX socket
 ****************************************************************************/
 
+#ifndef EMBEDDED_LIBRARY
 static void set_ports()
 {
   char	*env;
@@ -1355,7 +1356,6 @@ static void set_ports()
   }
 }
 
-#ifndef EMBEDDED_LIBRARY
 /* Change to run as another user if started with --user */
 
 static struct passwd *check_user(const char *user)
@@ -2614,16 +2614,18 @@ int STDCALL handle_kill(ulong ctrl_type)
 }
 #endif
 
+#if !defined(EMBEDDED_LIBRARY)
 static const char *load_default_groups[]= {
 #ifdef WITH_NDBCLUSTER_STORAGE_ENGINE
 "mysql_cluster",
 #endif
 "mysqld","server", MYSQL_BASE_VERSION, 0, 0};
 
-#if defined(__WIN__) && !defined(EMBEDDED_LIBRARY)
+#if defined(__WIN__)
 static const int load_default_groups_sz=
 sizeof(load_default_groups)/sizeof(load_default_groups[0]);
 #endif
+#endif /*!EMBEDDED_LIBRARY*/
 
 
 /*
@@ -3384,6 +3386,10 @@ server.");
     }
   }
 
+  /* if the errmsg.sys is not loaded, terminate to maintain behaviour */
+  if (!errmesg[0][0])
+    unireg_abort(1);
+
   /* We have to initialize the storage engines before CSV logging */
   if (ha_init())
   {
@@ -3743,7 +3749,7 @@ int main(int argc, char **argv)
     We have enough space for fiddling with the argv, continue
   */
   check_data_home(mysql_real_data_home);
-  if (my_setwd(mysql_real_data_home,MYF(MY_WME)))
+  if (my_setwd(mysql_real_data_home,MYF(MY_WME)) && !opt_help)
     unireg_abort(1);				/* purecov: inspected */
   mysql_data_home= mysql_data_home_buff;
   mysql_data_home[0]=FN_CURLIB;		// all paths are relative from here

sql/sql_plugin.cc

@@ -1939,8 +1939,7 @@ static int check_func_set(THD *thd, struct st_mysql_sys_var *var,
   char buff[STRING_BUFFER_USUAL_SIZE], *error= 0;
   const char *strvalue= "NULL", *str;
   TYPELIB *typelib;
-  long result;
-  ulonglong tmp;
+  ulonglong result;
   uint error_len;
   bool not_used;
   int length;
@@ -1966,18 +1965,17 @@ static int check_func_set(THD *thd, struct st_mysql_sys_var *var,
   }
   else
   {
-    if (value->val_int(value, (long long *)&tmp))
+    if (value->val_int(value, (long long *)&result))
       goto err;
-    if (unlikely((tmp >= (ULL(1) << typelib->count)) &&
+    if (unlikely((result >= (ULL(1) << typelib->count)) &&
                  (typelib->count < sizeof(long)*8)))
     {
-      llstr(tmp, buff);
+      llstr(result, buff);
       strvalue= buff;
       goto err;
     }
-    result= (long) tmp;
   }
-  *(long*)save= result;
+  *(ulonglong*)save= result;
   return 0;
 err:
   my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), var->name, strvalue);
@@ -2887,7 +2885,7 @@ static int construct_options(MEM_ROOT *mem_root, struct st_plugin_int *tmp,
       if (!opt->check)
         opt->check= check_func_set;
       if (!opt->update)
-        opt->update= update_func_long;
+        opt->update= update_func_longlong;
       break;
     default:
       sql_print_error("Unknown variable type code 0x%x in plugin '%s'.",