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

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Date:	Sun, 31 Jul 2011 23:34:45 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Arnaud Lacombe <lacombar@...il.com>
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

On Sun, 2011-07-31 at 18:07 -0400, Arnaud Lacombe wrote:
> I think you totally miss the point of the patch as you keep being
> self-centered on x86.

I'm focusing on x86 at the moment because x86 is the only architecture
that's *broken* in this respect. The other architectures that you
mention below, where they support 64-bit kernels, all work fine with
only *one* ARCH= setting covering all configurations. It's only x86
where we haven't actually *finished* the merge.

> 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. FWIW I usually solve this
problem with a two-line GNUmakefile:
	ARCH := arm
	include Makefile

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. 

-- 
dwmw2

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