linux-kernel - Re: [PATCH] kbuild: honor the ARCH setting of the existing configuration

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Date:	Sun, 31 Jul 2011 19:20:26 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] kbuild: honor the ARCH setting of the existing configuration

Hi,

On Sun, Jul 31, 2011 at 6:34 PM, David Woodhouse <dwmw2@...radead.org> wrote:
>> I am working with configuration for mips, sh, powerpc, arm and x86.
>> Some of them are for real board, some of them are to regress-test
>> compilers, binutils and kernel builds. Each of those config hardcode
>> the CROSS_COMPILER string and have their own build directory. In each
>> case, I want to be able to just run "make O=/src/obj/v3.0-arm
>> oldnoconfig all" without having to worry about anything else.
>
> Yes, that's a valid but *separate* problem.
yes, but I never really looked at it so far, I had the occasion now,
and did the patch.

> FWIW I usually solve this problem with a two-line GNUmakefile:
>        ARCH := arm
>        include Makefile
>
this would not work as I might ends up being multiple build in
parallel and I am an aficionados of `git clean -fdx' so the extra file
would go away.

> I haven't checked whether it works for out-of-source-tree builds; I bet
> it could be made to.
>
> I would love to see $ARCH turned into a proper configuration option.
>
I do not think this would be that hard, the main issue is that it
would heavily be cross-tree.

 - Arnaud
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