linux-kernel - Re: [PATCH V5 4/5] kbuild: Add support to build overlays (%.dtbo)

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Date:   Wed, 20 Jan 2021 23:40:54 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bill Mills <bill.mills@...aro.org>, anmar.oueja@...aro.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH V5 4/5] kbuild: Add support to build overlays (%.dtbo)

On 1/20/21 10:13 PM, Viresh Kumar wrote:
> On 21-01-21, 11:49, David Gibson wrote:
>> If you're using overlays, you probably need the -@ flag, for both the
>> base file and the overlays, which AFAICT is not already the case.
> 
> I think the idea was to do that in the platform specific Makefiles,
> unless I have misunderstood that from earlier discussions. So a
> platform may want to do that per-file or just enable it for the entire
> platform.
> 

Yes, that is correct.  For drivers/of/unitest-data/Makefile, we have
entries like:

DTC_FLAGS_overlay += -@
DTC_FLAGS_overlay_bad_phandle += -@
DTC_FLAGS_overlay_bad_symbol += -@
DTC_FLAGS_overlay_base += -@
DTC_FLAGS_testcases += -@

-Frank