build: avoid warnings about set-but-not-used variables

[bison.git] / doc / Makefile.am

diff --git a/doc/Makefile.am b/doc/Makefile.am
index 36370fca4ef90045a53e954cd3d67af9d985fc05..1d393d43b503f1b6ffed89110355a47ffb464718 100644 (file)
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,6 +1,6 @@
 ## Process this file with automake to produce Makefile.in -*-Makefile-*-
-## Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008 Free Software
-## Foundation, Inc.
+
+## Copyright (C) 2001-2003, 2005-2011 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -26,9 +26,12 @@ clean-local:
 
 CROSS_OPTIONS_PL = $(top_srcdir)/build-aux/cross-options.pl
 $(srcdir)/cross-options.texi: $(top_srcdir)/src/getargs.c $(CROSS_OPTIONS_PL)
-       -rm -f $@ $@.tmp
+       mv -f $@ $@~ || : >$@~
+       -rm -f $@.tmp
        cd $(top_builddir)/src && $(MAKE) $(AM_MAKEFLAGS) bison
-       $(top_builddir)/src/bison --help | perl $(CROSS_OPTIONS_PL) >$@.tmp
+       $(top_builddir)/src/bison --help \
+         | perl $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >$@.tmp
+       diff -u $@~ $@.tmp || true
        mv $@.tmp $@
 MAINTAINERCLEANFILES = $(srcdir)/cross-options.texi