X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/72183df4da75116a496099c856097f7f049b2d8a..966aba6583640869f5a0ab4a9ffc60dd40fd7406:/doc/Makefile.am

diff --git a/doc/Makefile.am b/doc/Makefile.am
index f5ff34b2..3c403275 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -26,10 +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) $(top_srcdir)/src/scan-gram.l >$@.tmp
+	diff -u $@~ $@.tmp || true
 	mv $@.tmp $@
 MAINTAINERCLEANFILES = $(srcdir)/cross-options.texi