linux-kernel - Re: [PATCH] kbuild: avoid unrecognized option error for external DTC

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Message-ID: <87tw7epqep.fsf@concordia.ellerman.id.au>
Date:   Tue, 28 Feb 2017 21:21:02 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Ben Hutchings <ben@...adent.org.uk>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org
Cc:     Alessio Igor Bogani <alessio.bogani@...ttra.eu>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, linux-c6x-dev@...ux-c6x.org,
        Michal Simek <monstr@...str.eu>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Marcin Nowakowski <marcin.nowakowski@...tec.com>,
        devicetree@...r.kernel.org,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Michal Marek <mmarek@...e.com>, Scott Wood <oss@...error.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org, Paul Mackerras <paulus@...ba.org>,
        openrisc@...ts.librecores.org, Mark Salter <msalter@...hat.com>,
        Stafford Horne <shorne@...il.com>,
        Aurelien Jacquiot <a-jacquiot@...com>,
        Jonas Bonn <jonas@...thpole.se>, linux-kernel@...r.kernel.org,
        Oliver O'Halloran <oohall@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Emese Revfy <re.emese@...il.com>
Subject: Re: [PATCH] kbuild: avoid unrecognized option error for external DTC

Ben Hutchings <ben@...adent.org.uk> writes:

> [ Unknown signature status ]
> On Mon, 2017-02-27 at 14:40 +0900, Masahiro Yamada wrote:
>> Since commit 6b22b3d1614a ("kbuild: Allow using host dtc instead of
>> kernel's copy"), it is possible to use an external dtc.  In this
>> case, we do not know which options are supported on it.
>> 
>> Commit bc553986a2f7 ("dtc: turn off dtc unit address warnings by
>> default") gives -Wno-unit_address_vs_reg, but this options is only
>> recognized by v1.4.2 or later.
>> 
>> If an older version is specified, the build fails:
>
> But the option to use an external dtc was intended to allow testing of
> newer versions.  If there's no reason to use this option to run an
> older version, why bother trying to support that?

+1

That's a lot of added complexity, when the answer could just be "use the
kernel dtc".

cheers