tz problem with GMT leap seconds when the file "backward" is omitted

[Paul Eggert]

We discussed the following change as part of a proposed larger patch
in late May when talking about the problems with sendmail 8.8.8 in
Australia.  The rest of the patch was done in a different way, but it
seems to me that a fix is still needed for installations that want
leap seconds, but also want to omit the links mentioned in the file
"backward".

Another possible fix would be to modify localtime.c so that it loads
"Etc/GMT" rather than "GMT" to get the leap second info for GMT.

===================================================================
RCS file: RCS/backward,v
retrieving revision 1997.10
retrieving revision 1997.10.1.1
diff -u -r1997.10 -r1997.10.1.1
--- backward	1997/12/11 17:44:35	1997.10
+++ backward	1998/05/24 07:28:25	1997.10.1.1
@@ -38,7 +38,6 @@
 Link	Africa/Cairo		Egypt
 Link	Europe/Dublin		Eire
 Link	Europe/London		GB
-Link	Etc/GMT			GMT
 Link	Etc/GMT+0		GMT+0
 Link	Etc/GMT-0		GMT-0
 Link	Etc/GMT0		GMT0
===================================================================
RCS file: RCS/etcetera,v
retrieving revision 1997.11
retrieving revision 1997.11.1.2
diff -u -r1997.11 -r1997.11.1.2
--- etcetera	1997/12/29 14:31:50	1997.11
+++ etcetera	1998/07/20 19:15:00	1997.11.1.2
@@ -10,6 +10,12 @@
 Zone	Etc/UTC		0	-	UTC
 Zone	Etc/UCT		0	-	UCT
 
+# The following link uses older naming conventions,
+# but it belongs here, not in the file `backward',
+# as functions like gmtime load the "GMT" file to handle leap seconds properly.
+# We want this to work even on installations that omit the other older names.
+Link	Etc/GMT				GMT
+
 Link	Etc/UTC				Etc/Universal
 Link	Etc/UTC				Etc/Zulu