[BZ #5186]

	* time/tzset.c (__tz_convert): Don't force testing for a change of
	TZ if not called from localtime.  But then also see whether the
	file changed, in case __use_tzfile is set.

ChangeLog

@@ -1,5 +1,10 @@
 2007-10-17  Ulrich Drepper  <drepper@redhat.com>
 
+	[BZ #5186]
+	* time/tzset.c (__tz_convert): Don't force testing for a change of
+	TZ if not called from localtime.  But then also see whether the
+	file changed, in case __use_tzfile is set.
+
 	* sysdeps/unix/sysv/linux/i386/bits/fcntl.h: Define F_DUPFD_CLOEXEC.
 	* sysdeps/unix/sysv/linux/ia64/bits/fcntl.h: Likewise.
 	* sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h: Likewise.

time/tzset.c

@@ -401,7 +401,7 @@ tzset_internal (always, explicit)
   if (tz && *tz == ':')
     ++tz;
 
-  /* Check whether the value changes since the last run.  */
+  /* Check whether the value changed since the last run.  */
   if (old_tz != NULL && tz != NULL && strcmp (tz, old_tz) == 0)
     /* No change, simply return.  */
     return;
@@ -606,9 +606,8 @@ __tz_convert (const time_t *timer, int use_localtime, struct tm *tp)
 
   /* Update internal database according to current TZ setting.
      POSIX.1 8.3.7.2 says that localtime_r is not required to set tzname.
-     This is a good idea since this allows at least a bit more parallelism.
-     By analogy we apply the same rule to gmtime_r.  */
-  tzset_internal (tp == &_tmbuf, 0);
+     This is a good idea since this allows at least a bit more parallelism.  */
+  tzset_internal (tp == &_tmbuf && use_localtime, 1);
 
   if (__use_tzfile)
     __tzfile_compute (*timer, use_localtime, &leap_correction,