linux-kernel - Re: [PATCH] kconfig CROSS

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Date:	Wed, 9 Sep 2009 15:20:00 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Roland McGrath <roland@...hat.com>
cc:	Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig CROSS_COMPILE option

On Mon, 7 Sep 2009, Roland McGrath wrote:
> > 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

Woow, that's shorter than mine :-)

--------------------------------------------------------------------------------

MAKEARGS = ARCH=powerpc CROSS_COMPILE=ppu- CC="ppu-gcc43 -m32 -mcpu=440"

MAKEFLAGS += --no-print-directory

.PHONY: all $(MAKECMDGOALS)

all	:= $(filter-out all Makefile,$(MAKECMDGOALS))

all:
	$(MAKE) $(MAKEARGS) $(all) -f Makefile

Makefile:;

$(all) %/: all
	@:

--------------------------------------------------------------------------------

Note that in this example I also have to override CC, as (1) ppu-gcc is gcc
version 4.1.1, i.e. too old and (2) ppu-gcc43 defaults to -m64 and -mcpu=cell.

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

Indeed, putting everything in .config would be more convenient.

With kind regards,

Geert Uytterhoeven
Software Architect
Techsoft Centre

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