linux-kernel - Re: [PATCH 1/2] kbuild: asm-generic support

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Date:	Thu, 13 Jan 2011 18:01:31 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Michal Marek <mmarek@...e.cz>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	linux arch <linux-arch@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Guan Xuetao <guanxuetao@...c.pku.edu.cn>
Subject: Re: [PATCH 1/2] kbuild: asm-generic support

On Thu, Jan 13, 2011 at 05:14:05PM +0100, Michal Marek wrote:
> On 9.1.2011 20:29, Sam Ravnborg wrote:
> > diff --git a/scripts/asm-generic.sh b/scripts/asm-generic.sh
> > new file mode 100644
> > index 0000000..d28127f
> > --- /dev/null
> > +++ b/scripts/asm-generic.sh
> > @@ -0,0 +1,33 @@
> > +#!/bin/sh
> > +#
> > +# include/asm-generic contains a lot of files that are used
> > +# verbatim by several architectures.
> > +#
> > +# This scripts read the file arch/$(ARCH)/include/asm/Kbuild
> > +# and for each file listed in this file with generic-y create
> > +# a small wrapper file in arch/$(ARCH)/include/generated/
> > +
> > +# read list of header files form Kbuild
> > +# The file has make syntax which looks like this:
> > +#
> > +# generic-y += <filename>
> > +
> > +srcdir=${srctree}/arch/$1/include/asm
> > +gendir=arch/$1/include/generated/asm
> > +
> > +# Read the list of files (note that the list uses make syntax)
> > +files=$( cat ${srcdir}/Kbuild | \
> > +          grep -v ^# | grep generic-y | cut -d '=' -f 2)
> 
> Now that the list of required generic headers is in a Kbuild file, it
> would be better to let make parse it, instead of enforcing one way to
> construct the list (it is the preferred way, but C files that do not
> conform to Documentation/CodingStyle are not rejected by the compiler
> either). I will post a patch when I'm back online in the evening.
Would be great!

Guan also pointed out a less than minor issue...
I overwrite the files each time so that I force a rebuild.

If you do not find time then I will update the
patch during the weekend.

	Sam
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