[tz] Pyongyang Time transition plan announced

[Paul Eggert]

On 05/02/2018 05:20 PM, Deborah Goldsmith wrote:
> I picked up the 2018e tag from the GitHub repository, but AFAICT it’s not possible to build the rearguard tarballs on a system that doesn’t have lzip.

It is possible. The following shell script worked for me:

make version
VERSION=`cat version`
make VERSION=$VERSION tzdata$VERSION-rearguard.tar.gz

This is an awkward hack, though, so thanks for reporting the issue. 
There should be a better way.

> The traditional_tarballs target doesn’t build the rearguard tarball. It probably should.

I'd prefer that target to build just the two traditional tarballs that 
we've been building for ages, and to have a new target for the new 
stuff. How about the attached proposed patch? With it, one can build the 
tarball in question with 'make rearguard_tarballs', which is more 
convenient than the above hack.
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From bfc12fa663f6ae9bb58bd4859f85dab892bc5ea4 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Wed, 2 May 2018 18:33:24 -0700
Subject: [PROPOSED] =?UTF-8?q?New=20=E2=80=98make=E2=80=99=20rule=20reargu?=
 =?UTF-8?q?ard=5Ftarballs?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Problem reported by Deborah Goldsmith in:
https://mm.icann.org/pipermail/tz/2018-May/026443.html
* Makefile (REARGUARD_ASC): New macro.
(ALL_ASC): Use it.
(rearguard_tarballs, rearguard_tarballs_version)
(rearguard_signatures, rearguard_signatures_version): New rules.
(tarballs_version): Use new rearguard_tarballs rule.
* NEWS: Mention this.
---
 Makefile | 20 +++++++++++++-------
 NEWS     | 10 ++++++++++
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index 21fa488..91c30f7 100644
--- a/Makefile
+++ b/Makefile
@@ -906,23 +906,27 @@ check_time_t_alternatives:
 TRADITIONAL_ASC = \
   tzcode$(VERSION).tar.gz.asc \
   tzdata$(VERSION).tar.gz.asc
-ALL_ASC = $(TRADITIONAL_ASC) \
-  tzdata$(VERSION)-rearguard.tar.gz.asc \
+REARGUARD_ASC = \
+  tzdata$(VERSION)-rearguard.tar.gz.asc
+ALL_ASC = $(TRADITIONAL_ASC) $(REARGUARD_ASC) \
   tzdb-$(VERSION).tar.lz.asc
 
-tarballs traditional_tarballs signatures traditional_signatures: version
+tarballs rearguard_tarballs traditional_tarballs \
+signatures rearguard_signatures traditional_signatures: version
 		VERSION=`cat version` && \
 		$(MAKE) VERSION="$$VERSION" $@_version
 
 # These *_version rules are intended for use if VERSION is set by some
 # other means.  Ordinarily these rules are used only by the above
 # non-_version rules, which set VERSION on the 'make' command line.
-tarballs_version: traditional_tarballs_version \
-  tzdata$(VERSION)-rearguard.tar.gz \
+tarballs_version: traditional_tarballs_version rearguard_tarballs_version \
   tzdb-$(VERSION).tar.lz
+rearguard_tarballs_version: \
+  tzdata$(VERSION)-rearguard.tar.gz
 traditional_tarballs_version: \
   tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz
 signatures_version: $(ALL_ASC)
+rearguard_signatures_version: $(REARGUARD_ASC)
 traditional_signatures_version: $(TRADITIONAL_ASC)
 
 tzcode$(VERSION).tar.gz: set-timestamps.out
@@ -1003,8 +1007,10 @@ zic.o:		private.h tzfile.h version.h
 .PHONY: check_zishrink
 .PHONY: clean clean_misc dummy.zd force_tzs
 .PHONY: install install_data maintainer-clean names
-.PHONY: posix_only posix_packrat posix_right
-.PHONY: public right_only right_posix signatures signatures_version
+.PHONY: posix_only posix_packrat posix_right public
+.PHONY: rearguard_signatures rearguard_signatures_version
+.PHONY: rearguard_tarballs rearguard_tarballs_version
+.PHONY: right_only right_posix signatures signatures_version
 .PHONY: tarballs tarballs_version
 .PHONY: traditional_signatures traditional_signatures_version
 .PHONY: traditional_tarballs traditional_tarballs_version
diff --git a/NEWS b/NEWS
index 9c445cd..e985ce6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,15 @@
 News for the tz database
 
+Unreleased, experimental changes
+
+  Changes to build procedure
+
+    New 'make' target 'rearguard_tarballs' to build the rearguard
+    tarball only.  This is a convenience on platforms that lack lzip
+    if you want to build the rearguard tarball.  (Problem reported by
+    Deborah Goldsmith.)
+
+
 Release 2018e - 2018-05-01 23:42:51 -0700
 
   Briefly:
-- 
2.17.0