| Constantin Kaplinsky | 0bb538b | 2006-05-30 06:05:33 +0000 | [diff] [blame] | 1 | # |
| 2 | # C / C++ header dependency stuff |
| 3 | # |
| 4 | # Needs GNU make and vncmkdepend, a hacked version of makedepend |
| 5 | |
| 6 | .SUFFIXES: .d |
| 7 | |
| 8 | CMAKEDEPEND = vncmkdepend |
| 9 | CXXMAKEDEPEND = vncmkdepend |
| 10 | |
| 11 | # |
| 12 | # The recommended method of doing dependency analysis in the GNU make manual |
| 13 | # turns out to be painfully slow. This method is similar but it's |
| 14 | # substantially faster and retains the desirable property that the user doesn't |
| 15 | # need to manually invoke a "make depend" step. |
| 16 | # |
| 17 | # As with the method described in the manual, we generate a separate dependency |
| 18 | # (.d) file for each source file. The .d file records the header files that |
| 19 | # each C or C++ source file includes. Any source file recorded in SRCS or |
| 20 | # CXXSRCS will cause us to try and include the corresponding .d file and GNU |
| 21 | # make then treats each .d file as a target to be remade. |
| 22 | # |
| 23 | # Unlike the manual's method, the rule we provide for making the .d file is |
| 24 | # actually a fake. All it does is record in a temporary file that the .d file |
| 25 | # needs to be remade. But as well as all the .d files, we also try to include |
| 26 | # a file called "depend.phony". This file never exists, but it causes GNU make |
| 27 | # to try and make the target "depend.phony". The rule for depend.phony then |
| 28 | # looks at the temporary files generated by the .d rules and then invokes the |
| 29 | # "omkdepend" program on all of the source files in one go. |
| 30 | # |
| 31 | |
| 32 | # |
| 33 | # We use simple assignment here to remove any of the depend.tmp files |
| 34 | # at the time make parses this bit. |
| 35 | # |
| 36 | |
| 37 | dummyvariable := $(shell $(RM) cdepend.tmp cxxdepend.tmp) |
| 38 | |
| 39 | # |
| 40 | # Now the "fake" rules for generating .d files. |
| 41 | # |
| 42 | |
| 43 | %.d: %.c |
| 44 | @echo "$<" >> cdepend.tmp |
| 45 | |
| 46 | %.d: %.cxx |
| 47 | @echo "$<" >> cxxdepend.tmp |
| 48 | |
| 49 | # |
| 50 | # The depend.phony rule which actually runs omkdepend. |
| 51 | # |
| 52 | |
| 53 | depend.phony: |
| 54 | @if [ -f cdepend.tmp ]; then \ |
| 55 | echo $(CMAKEDEPEND) $(ALL_CPPFLAGS) `cat cdepend.tmp`; \ |
| 56 | $(CMAKEDEPEND) $(ALL_CPPFLAGS) `cat cdepend.tmp`; \ |
| 57 | rm -f cdepend.tmp; \ |
| 58 | fi; \ |
| 59 | if [ -f cxxdepend.tmp ]; then \ |
| 60 | echo $(CXXMAKEDEPEND) $(ALL_CPPFLAGS) `cat cxxdepend.tmp`; \ |
| 61 | $(CXXMAKEDEPEND) $(ALL_CPPFLAGS) `cat cxxdepend.tmp`; \ |
| 62 | rm -f cxxdepend.tmp; \ |
| 63 | fi |
| 64 | |
| 65 | # |
| 66 | # Now include the .d files and the "depend.phony" file which never exists. |
| 67 | # For some reason GNU make evaluates the targets in reverse order, so we need |
| 68 | # to include depend.phony first. The "-" tells make not to complain that it |
| 69 | # can't find the file. |
| 70 | # |
| 71 | |
| 72 | -include depend.phony |
| 73 | |
| 74 | ifdef SRCS |
| 75 | -include $(patsubst %.c,%.d,$(patsubst %.cxx,%.d,$(SRCS))) |
| 76 | endif |