linux-kernel - Re: [patch] kbuild: remember ARCH in the object directory

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Message-Id: <20070612080422.988d0da8.randy.dunlap@oracle.com>
Date:	Tue, 12 Jun 2007 08:04:22 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Oleg Verych <olecom@...wer.upol.cz>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>,
	kbuild-devel@...ts.sourceforge.net
Subject: Re: [patch] kbuild: remember ARCH in the object directory

On Tue, 12 Jun 2007 12:31:56 +0200 Oleg Verych wrote:

> [patch] kbuild: remember ARCH in the object directory
> 
>  - rephrase some related (misspelled) comments,
>  - remove all trailing whitespace in the top Makefile,
> 
>  * remember ARCH in the output directory, thus making build of i386
>    on amd64 *actually* convenient,
> 
>  - harmless refactoring of the Makefile generating.
> 
> Signed-off-by: Oleg Verych <olecom@...wer.upol.cz>
> ---
> 
>  Just lazy typing `make ARCH=i386` every time i want to check lguest.

Hi Oleg,

So does this only work when O= is used?

I had tried to modify Makefile(s) to use the include/asm symlink
if it exists, so that 'make ARCH=i386' is not needed after the
symlink is created, but I never got that to work.

Thanks, this is useful in any case (not yet tested though).


>  Makefile           |   17 ++++++++---------
>  scripts/mkmakefile |   42 ++++++++++++++++++++++++------------------
>  2 files changed, 32 insertions(+), 27 deletions(-)
> 
> Index: linux-2.6.22-rc4-mm2/scripts/mkmakefile
> ===================================================================
> --- linux-2.6.22-rc4-mm2.orig/scripts/mkmakefile	2007-06-12 11:21:27.755466250 +0200
> +++ linux-2.6.22-rc4-mm2/scripts/mkmakefile	2007-06-12 12:04:13.675826250 +0200
> @@ -1,6 +1,6 @@
> -#!/bin/sh
> +#!/bin/sh -e
>  # Generates a small Makefile used in the root of the output
> -# directory, to allow make to be started from there.
> -# The Makefile also allow for more convinient build of external modules
> +# directory, to allow kernel build to be started from there.
> +# External modules can't built with it as well.
>  
>  # Usage
> @@ -9,28 +9,34 @@
>  # $3 - version
>  # $4 - patchlevel
> +# $5 - ARCH
>  
> +set -e
>  
> -test ! -r $2/Makefile -o -O $2/Makefile || exit 0
>  echo "  GEN     $2/Makefile"
> +echo "#
> +# Automatically generated by
> +# $0
> +#
> +VERSION		= $3
> +PATCHLEVEL	= $4
> +
> +KERNELSRC	= $1
> +KERNELOUTPUT	= $2
> +ARCH		= $5
> +" >$2/Makefile
>  
> -cat << EOF > $2/Makefile
> -# Automatically generated by $0: don't edit
> +cat << "EOF" >> $2/Makefile
> +MAKEFLAGS	+= -rR --no-print-directory
>  
> -VERSION = $3
> -PATCHLEVEL = $4
> +export ARCH
>  
> -KERNELSRC    := $1
> -KERNELOUTPUT := $2
> -
> -MAKEFLAGS += --no-print-directory
> +all:
> +	$(MAKE) -C $(KERNELSRC) O=$(KERNELOUTPUT)
>  
> -.PHONY: all \$(MAKECMDGOALS)
> +$(filter-out all Makefile,$(MAKECMDGOALS)) %/:
> +	$(MAKE) -C $(KERNELSRC) O=$(KERNELOUTPUT) $@
>  
> -all:
> -	\$(MAKE) -C \$(KERNELSRC) O=\$(KERNELOUTPUT)
> +.PHONY: all $(MAKECMDGOALS)
>  
>  Makefile:;
> -
> -\$(filter-out all Makefile,\$(MAKECMDGOALS)) %/:
> -	\$(MAKE) -C \$(KERNELSRC) O=\$(KERNELOUTPUT) \$@
>  EOF

---
~Randy
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