Re: how to create a single rule to build a directory as necessary

[Derek Clegg]

I always use order-only prerequisites for directories. For example,

bar/foo.o: foo.c | bar
        cc -o $@ -c $<

bar:
        mkdir -p $@

Works for me.
Derek

On Sep 22, 2009, at 11:17 AM, Kristof Provost wrote:

> On 2009-09-22 11:44:21 (-0400), Sam Steingold <address@hidden> wrote:
> > Kristof Provost wrote:
> > > [Dead links]
> Hmm, it looks like CM crossroads reworked their website.
> You can now find the 'Ask Mr. Make' column here:
> http://www.cmcrossroads.com/cm-articles/columns/ask-mr-make
>
> > I, too, am struggling with rebuilding a directory.
> > it appears that the rule:
> >
> > gllib: config.status
> >         mkdir -p gllib; cd gllib; make
> >
> > is wrong because the script "mkdir ..." is always executed,  
> > regardless of
> > whether config.status has changed or not.
> > So, what is the right way to handle this?
>
> I can't really tell why the gllib rule is always executed. If the
> config.status file is older than the gllib directory it shouldn't be.
> The '$?' variable might help you debug this problem. It contains the  
> names of all
> the prerequisites that are newer than the target.
>
> Regards.
> Kristof
>
>
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