Re: build-aux/po/Makefile.in.in needs updating

[Bruno Haible <bruno@clisp.org>]

Reuben Thomas wrote:
> > Bruno pointed out to me that there's a bug fixed in the Makfile.in.in from
> > gettext 0.20.2, which postdates the 0.20 version found in gnulib. (The bug
> > is that the Makefile.in.in has prerequisites on suffix rules, which are
> > ignored.)

Done. See below.

Paul Eggert wrote:
> In Gnulib I'd normally run 'config/srclist-update <config/srclist.txt' 
> to propagate stuff from other projects into Gnulib, but Bruno typically 
> does Gettext-related stuff by hand so srclist-update doesn't do that.

I do it by hand because it should be synced with the latest GNU gettext
release that is compatible with the current 'gettext' module. Syncing
with the contents of the git repo would bear major risks.


2023-02-05  Bruno Haible  <bruno@clisp.org>

	Update build-aux/po/Makefile.in.in.
	Reported by Reuben Thomas <rrt@sc3d.org> in
	<https://lists.gnu.org/archive/html/bug-gnulib/2023-02/msg00020.html>.
	* build-aux/po/Makefile.in.in: Sync from GNU gettext 0.21.1.
	Fixes:
	- In the .po -> .gmo rules, consider the newest changes to the POT file.
	- Emit a warning when creating a tarball without POT file.

diff --git a/build-aux/po/Makefile.in.in b/build-aux/po/Makefile.in.in
index c2cf0491b9..6b25f0d916 100644
--- a/build-aux/po/Makefile.in.in
+++ b/build-aux/po/Makefile.in.in
@@ -1,13 +1,13 @@
 # Makefile for PO directory in any package using GNU gettext.
 # Copyright (C) 1995-2000 Ulrich Drepper <drepper@gnu.ai.mit.edu>
-# Copyright (C) 2000-2023 Free Software Foundation, Inc.
+# Copyright (C) 2000-2020 Free Software Foundation, Inc.
 #
 # Copying and distribution of this file, with or without modification,
 # are permitted in any medium without royalty provided the copyright
 # notice and this notice are preserved.  This file is offered as-is,
 # without any warranty.
 #
-# Origin: gettext-0.20
+# Origin: gettext-0.21
 GETTEXT_MACRO_VERSION = 0.20
 
 PACKAGE = @PACKAGE@
@@ -90,6 +90,9 @@ DISTFILESDEPS = $(DISTFILESDEPS_$(DIST_DEPENDS_ON_UPDATE_PO))
 
 # Makevars gets inserted here. (Don't remove this line!)
 
+all: all-@USE_NLS@
+
+
 .SUFFIXES:
 .SUFFIXES: .po .gmo .sed .sin .nop .po-create .po-update
 
@@ -107,7 +110,8 @@ DISTFILESDEPS = $(DISTFILESDEPS_$(DIST_DEPENDS_ON_UPDATE_PO))
 # the .pot file. This eliminates the need to update the .po files when the
 # .pot file has changed, which would be troublesome if the .po files are put
 # under version control.
-.po.gmo: $(srcdir)/$(DOMAIN).pot
+$(GMOFILES): $(srcdir)/$(DOMAIN).pot
+.po.gmo:
 	@lang=`echo $* | sed -e 's,.*/,,'`; \
 	test "$(srcdir)" = . && cdcmd="" || cdcmd="cd $(srcdir) && "; \
 	echo "$${cdcmd}rm -f $${lang}.gmo && $(MSGMERGE) $(MSGMERGE_FOR_MSGFMT_OPTION) -o $${lang}.1po $${lang}.po $(DOMAIN).pot && $(GMSGFMT) -c --statistics --verbose -o $${lang}.gmo $${lang}.1po && rm -f $${lang}.1po"; \
@@ -123,8 +127,6 @@ DISTFILESDEPS = $(DISTFILESDEPS_$(DIST_DEPENDS_ON_UPDATE_PO))
 	mv t-$@ $@
 
 
-all: all-@USE_NLS@
-
 all-yes: $(srcdir)/stamp-po
 all-no:
 
@@ -413,12 +415,17 @@ dist distdir:
 	@$(MAKE) dist2
 # This is a separate target because 'update-po' must be executed before.
 dist2: $(srcdir)/stamp-po $(DISTFILES)
-	dists="$(DISTFILES)"; \
+	@dists="$(DISTFILES)"; \
 	if test "$(PACKAGE)" = "gettext-tools"; then \
 	  dists="$$dists Makevars.template"; \
 	fi; \
 	if test -f $(srcdir)/$(DOMAIN).pot; then \
 	  dists="$$dists $(DOMAIN).pot stamp-po"; \
+	else \
+	  case $(XGETTEXT) in \
+	    :) echo "Warning: Creating a tarball without '$(DOMAIN).pot', because a suitable 'xgettext' program was not found in PATH." 1>&2;; \
+	    *) echo "Warning: Creating a tarball without '$(DOMAIN).pot', because 'xgettext' found no strings to extract. Check the contents of the POTFILES.in file and the XGETTEXT_OPTIONS in the Makevars file." 1>&2;; \
+	  esac; \
 	fi; \
 	if test -f $(srcdir)/ChangeLog; then \
 	  dists="$$dists ChangeLog"; \