Re: autodependencies

[Luke Shumaker]

I've always used the example from the GNU Make manual:

%.d: %.c
        @set -e; rm -f $@; \
         $(CC) -M $(CPPFLAGS) $< > address@hidden; \
         sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < address@hidden > $@; \
         rm -f address@hidden

sources = foo.c bar.c
     
include $(sources:.c=.d)

-- 
~ LukeShu
http://lukeshu.ath.cx


On Wed, 2011-03-09 at 16:12 -0800, Dan Kujovich wrote:
> I am trying to get my dependencies working for obvious reasons.  But when I 
> try what has been offered, it lacks the primary goal of recompiling objects 
> when any of the dependencies (header files) change.
> 
> I like the gcc -MD command as it provides the proper dependencies, but I am 
> having trouble having my make file actually be able to use it.  Here is an 
> example of what I am grabbing from paulandlesley.org/autodep.html
> 
> 
> a.o : a.cpp
>           @gcc -MD -c a.cpp; \
>             cp $*.d $*.P; \
>             sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
>                 -e '/^$$/ d' -e 's/$$/ :/' < $*.d >> $*.P; \
>             rm -f $*.d
>           gcc -c a.cpp -o a.o
> 
> 
> here the command works the first time fine.  Then I change the
> header a.h and run make again and it says nothing needs to be done.
> 
> Dan
> 
> 
> 
> 
>       
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