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Date:   Mon, 6 Aug 2018 20:33:29 +0200
From:   Michal Kubecek <mkubecek@suse.cz>
To:     Masahiro Yamada <yamada.masahiro@socionext.com>
Cc:     Michal =?iso-8859-1?Q?Such=E1nek?= <msuchanek@suse.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Takashi Iwai <tiwai@suse.de>, Andreas Schwab <schwab@suse.de>,
        Michal Marek <michal.lkml@markovi.net>,
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Subject: Re: due to kconfig changes kernel config file is no longer
 sufficient for configuring the kernel
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On Mon, Jul 30, 2018 at 05:02:42PM +0900, Masahiro Yamada wrote:
> 
> For exmaple 'make ARCH=arm config' will create the config suitable
> only for ARM architecture.
> Then, you need to do 'make ARCH=arm' to build the kernel.
> 
> If it is tedious to give 'ARCH=arm' to every make command,
> you can do 'export ARCH=arm' in your shell.
> 
> Again, this is the behavior we have for a long time.

Actually, this no longer works reliably. For example, when I run

  ARCH=powerpc make oldconfig

with our ppc64le config on x86_64 system, I get different result than
when I run it on an actual ppc64le system (or when using a ppc64le cross
compiler on x86_64).

Since .config started to mix user configuration and build environment
capabilities, maintaining distribution configs became real pain. And
it's getting progressively worse.

Michal Kubecek