[Buildroot] [PATCH 3/4] Makefile: expose 'graph-depends' to generate a graph of the dependency tree

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Yann E. MORIN,

On Sat, 28 Dec 2013 12:56:34 +0100, Yann E. MORIN wrote:

> > Why isn't that one done in the package infrastructure, i.e in
> > pkg-generic.mk ?
> 
> For two reasons:
>   - to have both graph-depends and %-graph-depends side-by-side, so it
>     is easier to update the rules,

Right, that's a pretty good reason.

>   - to limit the number of rules in the Makefile, which is already a bit
>     long to parse.

Well, you still have the rule in pkg-generic.mk, which you added to
make the completion work. So practically speaking, the number of rules
is the same.

> I initially added that in package/pkg-generic.mk:
>     $(1)-graph-depends:
>         @install -d $(O)/graphs

Should be $(INSTALL) maybe?

>         @./support/scripts/graph-depends $(1) \
>         |dot -Tpdf \
>         -o $(O)/graphs/$$(@).pdf
> 
> But this adds yet another rule per-package to the Makefile. So for the
> reasons above, I decided to move it with graph-depends.
> 
> But I don't really care, I can change it back to a per-package rule.

To me, it makes more sense to have all the per-package rules in the
package infrastructure, but that's not a very strong opinion, since the
argument of having both the per-package and the global rules together
also makes sense.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com