- -rm -f $@ $@.tmp
- cd $(top_builddir)/src && $(MAKE) $(AM_MAKEFLAGS) bison
- $(top_builddir)/src/bison --help | perl $(CROSS_OPTIONS_PL) >$@.tmp
- mv $@.tmp $@
+ $(AM_V_GEN)mv -f $@ $@~ || : >$@~
+ $(AM_V_at)rm -f $@.tmp
+ $(AM_V_at)cd $(top_builddir)/src && $(MAKE) $(AM_MAKEFLAGS) bison
+ $(AM_V_at)$(top_builddir)/src/bison --help \
+ | perl $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >$@.tmp
+ $(AM_V_at)diff -u $@~ $@.tmp || true
+ $(AM_V_at)mv $@.tmp $@