2009/12/8 L.Guo <[email protected]>:
...
> I have a main makefile 'Makefile' and two sub (common) makefile 'default.mk'
> and 'rules.mk'.
>
> The source files all in 'src' dir, the output in 'out'. As these:
>
> SRCS = src/a.c src/main.c src/version.h
> DEPS = out/a.d out/main.d
> OBJS = out/a.o out/main.o
> TGTS = out/programme
>
> I want to use pattern rules in 'rules.mk' to handle the dependencies
> generating.
>
> $(OUTDIR)/%.d: $(SRCDIR)/%.c $(OUTDIR)
> �...@{ set -e; $(RM) $@;\
> echo 'Generate $@ from $<'\
> $(CC) -M $(CFLAGS) $< > $...@.$$$$;\
> sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $...@.$$$$ > $@;\
> $(RM) $...@.$$$$;\
> }
>
> $(OBJS): $(OUTDIR)/%.o: $(SRCDIR)/%.c $(OUTDIR)/%.d
> $(CC) -c $(CFLAGS) -o $@ $<
I suggest you read
http://make.paulandlesley.org/autodep.html#advanced
to see how having actual targets for the files included by make is
unnecessary and wasteful. It's sufficient (and more efficient) to
just have them created as a side-effect of the rule that generates the
.o files.
> When using the whole thing to build my project, 'make' gives me an error
> report:
>
> make: *** No rule to make target `main.c', needed by `out/main.d'.
> Stop.
I don't think this can be determined from what you've provided. I
suggest you check the output of
make -Rpq
and examine all the lines that include ".d" to see whether anything
stands out as "Not What I Meant".
Philip Guenther
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