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#
# C / C++ header dependency stuff
#
# Needs GNU make and vncmkdepend, a hacked version of makedepend
.SUFFIXES: .d
CMAKEDEPEND = vncmkdepend
CXXMAKEDEPEND = vncmkdepend
#
# The recommended method of doing dependency analysis in the GNU make manual
# turns out to be painfully slow. This method is similar but it's
# substantially faster and retains the desirable property that the user doesn't
# need to manually invoke a "make depend" step.
#
# As with the method described in the manual, we generate a separate dependency
# (.d) file for each source file. The .d file records the header files that
# each C or C++ source file includes. Any source file recorded in SRCS or
# CXXSRCS will cause us to try and include the corresponding .d file and GNU
# make then treats each .d file as a target to be remade.
#
# Unlike the manual's method, the rule we provide for making the .d file is
# actually a fake. All it does is record in a temporary file that the .d file
# needs to be remade. But as well as all the .d files, we also try to include
# a file called "depend.phony". This file never exists, but it causes GNU make
# to try and make the target "depend.phony". The rule for depend.phony then
# looks at the temporary files generated by the .d rules and then invokes the
# "omkdepend" program on all of the source files in one go.
#
#
# We use simple assignment here to remove any of the depend.tmp files
# at the time make parses this bit.
#
dummyvariable := $(shell $(RM) cdepend.tmp cxxdepend.tmp)
#
# Now the "fake" rules for generating .d files.
#
%.d: %.c
@echo "$<" >> cdepend.tmp
%.d: %.cxx
@echo "$<" >> cxxdepend.tmp
#
# The depend.phony rule which actually runs omkdepend.
#
depend.phony:
@if [ -f cdepend.tmp ]; then \
echo $(CMAKEDEPEND) $(ALL_CPPFLAGS) `cat cdepend.tmp`; \
$(CMAKEDEPEND) $(ALL_CPPFLAGS) `cat cdepend.tmp`; \
rm -f cdepend.tmp; \
fi; \
if [ -f cxxdepend.tmp ]; then \
echo $(CXXMAKEDEPEND) $(ALL_CPPFLAGS) `cat cxxdepend.tmp`; \
$(CXXMAKEDEPEND) $(ALL_CPPFLAGS) `cat cxxdepend.tmp`; \
rm -f cxxdepend.tmp; \
fi
#
# Now include the .d files and the "depend.phony" file which never exists.
# For some reason GNU make evaluates the targets in reverse order, so we need
# to include depend.phony first. The "-" tells make not to complain that it
# can't find the file.
#
-include depend.phony
ifdef SRCS
-include $(patsubst %.c,%.d,$(patsubst %.cxx,%.d,$(SRCS)))
endif
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