linux-kernel - Re: [PATCH] kbuild: Add DTC_CPP

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Date:   Wed, 18 Dec 2019 07:51:21 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH] kbuild: Add DTC_CPP_FLAGS

On Wed, Dec 18, 2019 at 7:37 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> (+CC: DT maintainers)
>
> On Wed, Dec 18, 2019 at 8:55 PM Frank Wunderlich
> <frank-w@...lic-files.de> wrote:
> >
> > With this Patch we are able to change cpp-preprocessor options
> > (e.g. -D...) for using conditions (#ifdef) in devicetree files
> > and dynamically add include searchpaths
>
> I think this is questionable
> since DT is supposed to describe hardware.
> Does it depends on #ifdef or some external defines?

NAK. #ifdefs and complex macros in particular are features we don't
want in dts files.

Rob