linux-kernel - Re: [PATCH v2 0/4] kconfig: store default ARCH in .config

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Date:	Mon, 1 Sep 2014 11:35:06 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Michal Marek <mmarek@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Paul Bolle <pebolle@...cali.nl>
Subject: Re: [PATCH v2 0/4] kconfig: store default ARCH in .config

On Mon, Sep 1, 2014 at 11:24 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> Hi Konstantin,
>
> On Mon, Sep 1, 2014 at 9:16 AM, Konstantin Khlebnikov <koct9i@...il.com> wrote:
>> This is second attempt of fixing target archecture amnesia.
>> v1 patch: http://lkml.kernel.org/r/20140706080234.19520.96704.stgit@zurg
>>
>> First version saved ARCH as CONFIG_DEFAULT_ARCH and used it as defult ARCH.
>>
>> This version changes semantic of Kconfig option env="...", now it acts more
>> like the user input, except that the value comes from the environment.
>> Variable from environment overrides all defaults and value from config file.
>> If environment variable is not defined this option has no effect.
>>
>> So, now ARCH is saved as CONFIG_ARCH.
>>
>> Also this patchset links CONFIG_CROSS_COMPILE and CROSS_COMPILE in the same way.
>> Changing it in command line/environment also updates value in the config file.
>
> Thanks, I haven't tried this yet, but it looks promising!
>
> For the record, right now I use a GNUmakefile (which takes precedence over
> the Makefile) in the build directory containing e.g.

Heh, I've used and seen a lot of such hacks.
GNUmakefile also might include Makefile after defining environment.

>
> MAKEARGS = ARCH=arm CROSS_COMPILE=arm-unknown-linux-gnueabi-
>
> MAKEFLAGS += --no-print-directory
>
> .PHONY: all $(MAKECMDGOALS)
>
> all := $(filter-out all Makefile,$(MAKECMDGOALS))
>
> all:
>         $(MAKE) $(MAKEARGS) $(all) -f Makefile
>
> Makefile:;
>
> $(all) %/: all
>         @:
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
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