2013-12-04 21:33:17 +00:00
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$(DEPDIR)/deps-ver: $(top_srcdir)/deps-ver
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@[ -f $@ ] || \
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cp $(top_srcdir)/deps-ver $@
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@[ -w $@ ] || \
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chmod ug+w $@
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@cmp $(top_srcdir)/deps-ver $@ > /dev/null || ( \
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2014-12-20 22:52:39 +00:00
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$(MAKE) $(AM_MAKEFLAGS) clean && \
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2013-12-04 21:33:17 +00:00
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echo -n "Prior $(subdir)/$(DEPDIR) version " && \
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cat $@ && \
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rm -rf $(DEPDIR) && \
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mkdir $(DEPDIR) && \
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case "$(top_builddir)" in \
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.) \
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./config.status Makefile depfiles \
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;; \
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*) \
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2014-12-20 22:52:39 +00:00
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cd "$(top_builddir)" && \
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./config.status $(subdir)/Makefile depfiles && \
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cd $(subdir) \
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2013-12-04 21:33:17 +00:00
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;; \
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esac && \
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echo -n "Cleaned $(subdir)/$(DEPDIR) version " && \
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cat $(top_srcdir)/deps-ver \
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)
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cp $(top_srcdir)/deps-ver $@
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.deps-ver: $(top_srcdir)/deps-ver
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2014-12-20 22:52:39 +00:00
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@[ ! -d $(DEPDIR) ] || $(MAKE) $(AM_MAKEFLAGS) $(DEPDIR)/deps-ver
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2013-12-04 21:33:17 +00:00
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@touch $@
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BUILT_SOURCES += .deps-ver
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CLEANFILES += .deps-ver
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#
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# depsver.mf included in Makefile.am for directories with .deps
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#
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# When building in the same directory with sources that change over
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# time, such as when tracking using bk, the .deps files can become
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# stale with respect to moved, deleted, or superceded headers. Most
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# commonly, this would exhibit as make reporting a failure to make a
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# header file which is no longer in the location given. To address
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# this issue, we use a deps-ver file which is updated with each change
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# that breaks old .deps files. A copy of deps-ver is made into
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# $(DEPDIR) if not already present. If $(DEPDIR)/deps-ver is present
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# with different contents than deps-ver, we make clean to ensure all
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# .o files built before the incompatible change are rebuilt along with
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# their updated .deps files, then remove $(DEPDIR) and recreate it as
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# empty stubs.
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#
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# It is normal when configured with --disable-dependency-tracking for
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# the DEPDIR to not have been created. For this reason, we use the
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# intermediate target .deps-ver, which invokes make recursively if
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# DEPDIR exists.
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#
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# If you modify depsver.mf, please make the changes to the master
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# copy, the one in sntp is copied by the bootstrap script from it.
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#
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# This comment block follows rather than leads the related code so that
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# it stays with it in the generated Makefile.in and Makefile.
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#
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