From 9d162bf188a091431741ca8b8e38997b8787ba8c Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Mon, 16 Jun 2008 15:37:23 +0000
Subject: [PATCH] * m4/po.m4: remove POTFILES.in if it is empty, otherwise it
 is rebuilt             only when a Makefile.am is modified.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@25278 a592a061-630c-0410-9148-cb99ea01b6c8
---
 m4/po.m4 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/m4/po.m4 b/m4/po.m4
index 00133ef36f..3bfafbe1c2 100644
--- a/m4/po.m4
+++ b/m4/po.m4
@@ -112,6 +112,13 @@ changequote([,])dnl
           test -n "$as_me" && echo "$as_me: creating $ac_dir/POTFILES" || echo "creating $ac_dir/POTFILES"
           cat "$ac_given_srcdir/$ac_dir/POTFILES.in" | sed -e "/^#/d" -e "/^[ 	]*\$/d" -e "s,.*,     $top_srcdir/& \\\\," | sed -e "\$s/\(.*\) \\\\/\1/" > "$ac_dir/POTFILES"
           POMAKEFILEDEPS="POTFILES.in"
+	  # Remove POTFILES.in if it is empty, such that it can be
+	  # correctly rebuilt later.
+	  if test -s "$ac_given_srcdir/$ac_dir/POTFILES.in"; then
+	    : ;
+	  else
+	    rm -f "$ac_given_srcdir/$ac_dir/POTFILES.in"
+	  fi
           # ALL_LINGUAS, POFILES, UPDATEPOFILES, DUMMYPOFILES, GMOFILES depend
           # on $ac_dir but don't depend on user-specified configuration
           # parameters.