Re: [PATCH RESEND v3 0/2] Makefile: libfdt: build only the strict necessary

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Apr 15, 2020 at 10:16:52AM +0200, Claudio Fontana wrote:
> On 4/14/20 4:03 AM, David Gibson wrote:
> > On Sat, Apr 11, 2020 at 11:31:48AM +0200, Claudio Fontana wrote:
> >> v2 -> v3:
> >>
> >> * changed into a 2 patch series; in the second patch we remove the old
> >>   compatibility gunks that were meant for removal some time after 4.1.
> >>
> >> * renamed the libfdt PHONY rule to dtc/all, with the intent to make
> >>   existing working trees forward and backward compatible across the change.
> >>
> >> v1 -> v2:
> >>
> >> * fix error generated when running UNCHECKED_GOALS without prior configure,
> >>   for example during make docker-image-fedora. Without configure, DSOSUF is
> >>   empty, and the module pattern rule in rules.mak that uses this variable
> >>   can match too much; provide a default in the Makefile to avoid it.
> >>
> >> * only attempt to build the archive when there is a non-empty list of objects.
> >>   This could be done in general for the %.a: pattern in rules.mak, but maybe
> >>   there are valid reasons to build an empty .a?
> >>
> >> * removed some intermediate variables that did not add much value
> >>   (LIBFDT_srcdir, LIBFDT_archive)
> >>
> >> Tested locally with 3 VPATH configurations (no-, VPATH, VPATH in src subdir),
> >> and with docker-image-fedora, docker-test-debug@fedora that failed
> >> before.
> > 
> > Seems reasonable to me.  It's a bit of a shame that we can't use the
> > dtc makefiles more simply for this.  But I don't quickly know how to
> > fix them upstream to allow that.
> 
> 
> Hi David,

Sorry it's taken so long to reply.

> I tried to look at dtc upstream makefiles, I don't see a perfect
> solution at the moment.
> 
> I came up with this idea though (not fully tested..) that _could_
> work, ie special casing the libfdt target when it is the only goal
> in MAKECMDGOALS.
> 
> Any thoughts?

Bit of a hack, but still better than what we have now.  If you post
that for dtc upstream <devicetree-compiler@vger.kernel.org>, I'd apply
it.

Another improvement would be to not include these files on a "make
clean" - it's kind of annoying how a make clean will regenerate all
these before removing them.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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