Re: make question : How to handle autodependencies with source in multiple directories

[Henrik Carlqvist]

dcw.web@gmail.com wrote:
> 1. Is there a better way?

I don't know if you think that I am able to help...

> 2. Am I crazy for trying this?

Absoluetly not. I think that make should be used to automate as much as
possible. In this case the compiler has to do most of the job to find the
dependencies.
 
>     36$(SC_OBJ_DIR)/%.o : %.cpp
>     37        $(SCCOM) $<
>     38        @sed -e 's|^[^:]*:|$(SC_OBJ_DIR)/&|' $*.d > $(SC_OBJ_DIR)/$*.P;\
>     39        sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \ 
>     40                -e'/^$$/ d' -e 's/$$/ :/' < $*.d >> $(SC_OBJ_DIR)/$*.P; 
> \
>     41        rm -f $*.d

I don't think you need all that sed, and I don't realize why you want to
remove the dependeny file after the compilation. Here are some snippets
from one of my makefiles:

OBJS = $(FILES:%=$(OBJ)/%.o)
DEPS = $(FILES:%=$(DEP)/%.d)

$(OBJS): $(OBJ)/%.o: $(SRC)/%.c $(DEP)/%.d
        $(CC) $(CFLAGS) -o $@ $<

$(DEPS): $(DEP)/%.d: $(SRC)/%.c
ifeq ($(MAKECMDGOALS),quiet)
        @if((printf "$@ $(OBJ)/";$(CC) -MM $(CFLAGS)  $< )> $@); then true; \
        else rm $@; false; fi
else
        if((printf "$@ $(OBJ)/";$(CC) -MM $(CFLAGS)  $< )> $@); then true; \
        else rm $@; false; fi
endif

ifneq ($(MAKECMDGOALS),mrproper)
ifneq ($(wildcard $(DEPS)),)
include $(wildcard $(DEPS))
endif
endif

So whenever an object file is created I make sure that the corresponding
.d file exist. If it doesn't already exist it is created and the object
file is rebuilt. If the .d file exist it is included at the end of the
makefile and its rules will be taken into consideration by make. I have a
rule "mrproper" which removes not only all object files but also the .d
files.

regards Henrik
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