##                                                             -*- makefile -*-

## We keep a list of dependencies in `.depend' for each of the source
## files on which it depends.  When one of the source files is modified
## we remove its record from .depend and regenerate its dependencies,
## tacking them onto the end of .depend.  By including the .depend file
## into the makefile, we're telling make that the makefile depends on
## the dependency list in the .depend file.
##
## This is as fast as the `.d' method described in the GNU make manual
## for automatic dependencies, but has the added advantage that all
## dependencies are stored in one place.  The advantage over the
## `makedepend' program is that only those files that are out of date
## have dependency information rebuilt, and the Makefile is not
## modified.
##
## This is also where tracing information is updated.  The $(TRACE)
## program is run on each source file to make sure that the H5TRACE()
## macros are up to date.  If they are then the file is not modified,
## otherwise the file is changed and a backup is saved by appending a
## tilde to the file name.
##
$(srcdir)/Dependencies: .depend
	@if test "$(srcdir)" != "."; then				      \
	    echo '## This file is machine generated on GNU systems.' >$@;     \
	    echo '## Only temporary changes may be made here.' >>$@;	      \
	    echo >>$@;					      		      \
	    perl -p $(top_srcdir)/bin/distdep .depend >>$@;		      \
	else								      \
	    echo 'Dependencies cannot be built when $$srcdir == $$builddir';  \
	fi

.depend: $(LIB_SRC) $(TEST_SRC) $(PROG_SRC)
	@touch .depend
	@for dep in $? dummy; do					      \
	   if [ $$dep != "dummy" ]; then				      \
	      case "$$dep" in						      \
	         *.C)							      \
	            echo Building dependencies for $$dep;		      \
	            obj=`basename $$dep .C`.lo;				      \
	            sed '\%^'"$$obj"':%,\%[^\\]$$%d' <$@ >$@- && mv $@- $@;   \
	            $(TRACE) $$dep;					      \
	            $(CC) -M -MG $(CPPFLAGS) $$dep 2>/dev/null |	      \
                        sed 's% $(srcdir)/% $$(srcdir)/%g' |		      \
                        sed 's% $(top_srcdir)/% $$(top_srcdir)/%g' |	      \
                        sed 's% $(top_builddir)/% $$(top_builddir)/%g' |      \
	                sed 's/\.o/.lo/' >>$@;				      \
	            ;;							      \
	      esac;							      \
	   fi;								      \
	done;

-include .depend