43447: Generate tar.xz artifacts only.

ChangeLog

@@ -1,5 +1,8 @@
 2018-09-12  Daniel Shahaf  <d.s@daniel.shahaf.name>
 
+	* 43447: Etc/creating-a-release.txt, Makefile.in: Generate
+	tar.xz artifacts only.
+
 	* 43443: Completion/Unix/Command/_git: When completing worktrees,
 	show the ref and hash of each worktree.
 

Etc/creating-a-release.txt

@@ -40,8 +40,6 @@ To create a zsh release:
 	make tarxz-doc tarxz-src
 	for i in zsh*.tar.?z ; do gpg -ab -- $i ; done
 
-	# The tarxz-* targets create both *.tar.gz and *.tar.xz.
-
 - [one time step] Add your key to http://zsh.sf.net/Arc/source.html; see README in the 'web' repository for how to do this.  Its URL is:
 
 	git clone git://git.code.sf.net/p/zsh/web

Makefile.in

@@ -159,28 +159,19 @@ $(sdir)/stamp-h.in: $(sdir)/configure
 
 DISTNAME = zsh-$(VERSION)
 
-targz-src: $(DISTNAME).tar.gz
-$(DISTNAME).tar.gz: FORCE
+tarxz-src: $(DISTNAME).tar.xz
+$(DISTNAME).tar.xz: FORCE
 	@$(sdir_top)/Util/mkdisttree.sh $(DISTNAME) $(sdir_top) $(dir_top) SRC \
 	    $(MAKE) $(MAKEDEFS)
 	echo '#define ZSH_PATCHLEVEL "'`cd $(sdir_top) && git describe --tags --long --abbrev=7`'"' >$(DISTNAME)/Src/patchlevel.h.release
-	tar cf - $(DISTNAME) | gzip -9 > $@
+	tar cf - $(DISTNAME) | xz -9 > $@
 	rm -rf $(DISTNAME)
 
-targz-doc: $(DISTNAME)-doc.tar.gz
-$(DISTNAME)-doc.tar.gz: FORCE
+tarxz-doc: $(DISTNAME)-doc.tar.xz
+$(DISTNAME)-doc.tar.xz: FORCE
 	@$(sdir_top)/Util/mkdisttree.sh $(DISTNAME) $(sdir_top) $(dir_top) DOC \
 	    $(MAKE) $(MAKEDEFS)
-	tar cf - $(DISTNAME) | gzip -9 > $@
+	tar cf - $(DISTNAME) | xz -9 > $@
 	rm -rf $(DISTNAME)
 
 FORCE:
-
-tarxz-src: $(DISTNAME).tar.xz
-$(DISTNAME).tar.xz: $(DISTNAME).tar.gz
-	< $< zcat | xz -9 > $@
-
-tarxz-doc: $(DISTNAME)-doc.tar.xz
-$(DISTNAME)-doc.tar.xz: $(DISTNAME)-doc.tar.gz
-	< $< zcat | xz -9 > $@
-