1$(DEPDIR)/deps-ver: $(top_srcdir)/deps-ver
2	@[ -f $@ ] ||							\
3		cp $(top_srcdir)/deps-ver $@
4	@[ -w $@ ] ||							\
5		chmod ug+w $@
6	@cmp $(top_srcdir)/deps-ver $@ > /dev/null || (			\
7		$(MAKE) clean &&					\
8		echo -n "Prior $(subdir)/$(DEPDIR) version " &&		\
9		cat $@ &&						\
10		rm -rf $(DEPDIR) &&					\
11		mkdir $(DEPDIR) && 					\
12		case "$(top_builddir)" in				\
13		 .)							\
14		    ./config.status Makefile depfiles			\
15		    ;;							\
16		 ..)							\
17			cd .. &&					\
18			./config.status $(subdir)/Makefile depfiles &&	\
19			cd $(subdir)					\
20		    ;;							\
21		 *)							\
22		    echo 'Fatal: depsver.mf Automake fragment limited'	\
23			 'to immediate subdirectories.'	&&		\
24		    echo "top_builddir:	$(top_builddir)" &&		\
25		    echo "subdir:	$(subdir)" &&			\
26		    exit 1						\
27		    ;;							\
28		esac &&							\
29		echo -n "Cleaned $(subdir)/$(DEPDIR) version " &&	\
30		cat $(top_srcdir)/deps-ver				\
31	)
32	cp $(top_srcdir)/deps-ver $@
33
34.deps-ver: $(top_srcdir)/deps-ver
35	@[ ! -d $(DEPDIR) ] || $(MAKE) $(DEPDIR)/deps-ver
36	@touch $@
37
38BUILT_SOURCES += .deps-ver
39CLEANFILES += .deps-ver
40
41#
42# depsver.mf	included in Makefile.am for directories with .deps
43#
44# When building in the same directory with sources that change over
45# time, such as when tracking using bk, the .deps files can become
46# stale with respect to moved, deleted, or superceded headers.  Most
47# commonly, this would exhibit as make reporting a failure to make a
48# header file which is no longer in the location given.  To address
49# this issue, we use a deps-ver file which is updated with each change
50# that breaks old .deps files.  A copy of deps-ver is made into
51# $(DEPDIR) if not already present.  If $(DEPDIR)/deps-ver is present
52# with different contents than deps-ver, we make clean to ensure all
53# .o files built before the incompatible change are rebuilt along with
54# their updated .deps files, then remove $(DEPDIR) and recreate it as
55# empty stubs.
56#
57# It is normal when configured with --disable-dependency-tracking for
58# the DEPDIR to not have been created.  For this reason, we use the
59# intermediate target .deps-ver, which invokes make recursively if
60# DEPDIR exists.
61#
62# If you modify depsver.mf, please make the changes to the master
63# copy, the one in sntp is copied by the bootstrap script from it.
64#
65# This comment block follows rather than leads the related code so that
66# it stays with it in the generated Makefile.in and Makefile.
67#
68