Fix for 64 bit machines (To remove warnings on Itanium)

mysys/thr_alarm.c:
  Safety fix

include/my_global.h

@@ -634,7 +634,12 @@ extern double		my_atof(const char*);
   Max size that must be added to a so that we know Size to make
   adressable obj.
 */
+#if SIZEOF_CHARP == 4
 typedef long		my_ptrdiff_t;
+#else
+typedef long long	my_ptrdiff_t;
+#endif
+
 #define MY_ALIGN(A,L)	(((A) + (L) - 1) & ~((L) - 1))
 #define ALIGN_SIZE(A)	MY_ALIGN((A),sizeof(double))
 /* Size to make adressable obj. */

mysys/thr_alarm.c

@@ -169,6 +169,7 @@ bool thr_alarm(thr_alarm_t *alrm, uint sec, ALARM *alarm_data)
     if (!(alarm_data=(ALARM*) my_malloc(sizeof(ALARM),MYF(MY_WME))))
     {
       DBUG_PRINT("info", ("failed my_malloc()"));
+      *alrm= 0;					/* No alarm */
       pthread_mutex_unlock(&LOCK_alarm);
       pthread_sigmask(SIG_SETMASK,&old_mask,NULL);
       DBUG_RETURN(1);