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Diffstat (limited to 'depend.mk')
| -rw-r--r-- | depend.mk | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/depend.mk b/depend.mk new file mode 100644 index 00000000..51d4cd63 --- /dev/null +++ b/depend.mk @@ -0,0 +1,76 @@ +# +# 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 |