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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Sat, 16 Mar 2019 00:25:17 +0900
Message-ID: <CAK7LNASzUiiG7ivyVmZCMF+5NbfrXJDw3GcLd-05pOk6+r5_Cg@mail.gmail.com>
Subject: Re: [PATCH] powerpc: use $(origin ARCH) to select KBUILD_DEFCONFIG
To:     Michael Ellerman <mpe@ellerman.id.au>
Cc:     Mathieu Malaterre <malat@debian.org>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        Paul Mackerras <paulus@samba.org>,
        LKML <linux-kernel@vger.kernel.org>
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On Thu, Mar 14, 2019 at 11:27 AM Michael Ellerman <mpe@ellerman.id.au> wrote:
>
> Mathieu Malaterre <malat@debian.org> writes:
> > On Sat, Feb 16, 2019 at 3:26 AM Masahiro Yamada
> > <yamada.masahiro@socionext.com> wrote:
> >>
> >> On Sat, Feb 16, 2019 at 1:11 AM Mathieu Malaterre <malat@debian.org> wrote:
> >> >
> >> > On Fri, Feb 15, 2019 at 10:41 AM Masahiro Yamada
> >> > <yamada.masahiro@socionext.com> wrote:
> >> > >
> >> > > I often test all Kconfig commands for all architectures. To ease my
> >> > > workflow, I want 'make defconfig' at least working without any cross
> >> > > compiler.
> >> > >
> >> > > Currently, arch/powerpc/Makefile checks CROSS_COMPILE to decide the
> >> > > default defconfig source.
> >> > >
> >> > > If CROSS_COMPILE is unset, it is likely to be the native build, so
> >> > > 'uname -m' is useful to choose the defconfig. If CROSS_COMPILE is set,
> >> > > the user is cross-building (i.e. 'uname -m' is probably x86_64), so
> >> > > it falls back to ppc64_defconfig. Yup, make sense.
> >> > >
> >> > > However, I want to run 'make ARCH=* defconfig' without setting
> >> > > CROSS_COMPILE for each architecture.
> >> > >
> >> > > My suggestion is to check $(origin ARCH).
> >> > >
> >> > > When you cross-compile the kernel, you need to set ARCH from your
> >> > > environment or from the command line.
> >> > >
> >> > > For the native build, you do not need to set ARCH. The default in
> >> > > the top Makefile is used:
> >> > >
> >> > >   ARCH            ?= $(SUBARCH)
> >> > >
> >> > > Hence, $(origin ARCH) returns 'file'.
> >> > >
> >> > > Before this commit, 'make ARCH=powerpc defconfig' failed:
> >> >
> >> > In case you have not seen it, please check:
> >> >
> >> > http://patchwork.ozlabs.org/patch/1037835/
> >>
> >> I did not know that because I do not subscribe to ppc ML.
> >>
> >> Michael's patch looks good to me.
> >
> > OK
> >
> >>
> >> If you mimic x86, the following will work:
> >>
> >
> > Nice! Michael do you have a preference ?
>
> Yeah I don't like playing games with ARCH. Doing so means auto builders
> and other build scripts need to learn about the special rules for ARCH,
> which is a pain.
>
> So I'll merge my patch, which I think will also work for Masahiro's
> case.
>
> cheers


Yes, works for me.

Thanks!


-- 
Best Regards
Masahiro Yamada