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From: Roland McGrath <roland@redhat.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Sam Ravnborg <sam@ravnborg.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kconfig CROSS_COMPILE option
In-Reply-To: Pavel Machek's message of  Monday, 7 September 2009 15:09:04 +0200 <20090907130402.GB1595@ucw.cz>
References: <20090905002947.A4C678BEB1@magilla.sf.frob.com>
	<20090907130402.GB1595@ucw.cz>
Message-Id: <20090907183801.379228BF3F@magilla.sf.frob.com>
Date: Mon,  7 Sep 2009 11:38:01 -0700 (PDT)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 890
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> Yes that would be very nice. Editing Makefile every time I
> crosscomppile for arm sucks.

The other trick I can recommend is to write a GNUmakefile containing:

ARCH=foo
CROSS_COMPILE=foo-linux-
include Makefile

(GNU make reads GNUmakefile in preference to Makefile.)
But this manual hackery is still not nearly as nice as the automagic way.

> But... do we need an option for subarch, too? And will Kconfig system
> handle that?

I'm not sure I follow exactly what your concern is.  I am mostly familiar
with doing x86 and powerpc builds.  For both of those, the kernel config
sets whether it's the 32-bit or 64-bit world.


Thanks,
Roland
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