linux-kernel - Re: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format

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Message-Id: <20130718003408.bb9d5b51.akpm@linux-foundation.org>
Date:	Thu, 18 Jul 2013 00:34:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	Sam Ravnborg <sam@...nborg.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Kyungsik Lee <kyungsik.lee@....com>,
	Michal Marek <mmarek@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	CE Linux Developers List <celinux-dev@...ts.celinuxforum.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, hyojun.im@....com,
	chan.jeong@....com, Andy Lee <raphael.andy.lee@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <rmk@....linux.org.uk>,
	Borislav Petkov <bp@...en8.de>,
	Florian Fainelli <florian@...nwrt.org>,
	Yann Collet <yann.collet.73@...il.com>,
	Chanho Min <chanho.min@....com>
Subject: Re: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new
 streaming format

On Thu, 18 Jul 2013 09:22:58 +0200 Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> On Thu, Jul 18, 2013 at 12:30 AM, Yann E. MORIN <yann.morin.1998@...e.fr> wrote:
> > On 2013-07-17 23:16 +0200, Sam Ravnborg spake thusly:
> >> > We could extend the symbol option part to retreive values from a binary.
> >> > Something like this:
> >> >
> >> > config FOOBAR
> >> >         bool
> >> >         option exec="true"
> >> >
> >> > FOOBAR would assume the value "y" if the command true has exit code == 0, otherwise "n".
> >> > And similar conversions for other types.
> >> >
> >> > This only extendt Kconfig slightly - using an already present method to import
> >> > external values.
> >> >
> >> > The drawback I see with this approach is that we may execute a lot of small programs
> >> > where the value is never used.
> >>
> >> Following is a quick patch implmenting this idea.
> >> You need to run gperf manually to enable this.
> >>
> >> "gperf -C scripts/kconfig/zconf.gperf > scripts/kconfig/zconf.hash.c"
> >>
> >> I did not figure out how to use the built-in rules to generate this file :-(
> >
> > make REGENERATE_PARSERS=y menuconfig
> >
> >> I have tested this lightly - as we should discuss if this is a viable way forward.
> >
> > Instead of extending the Kconfig language, I was thinking (as initially
> > suggested by Andrew) of generating a Kconfig file before all config
> > targets, and source that Kconfig file from $(TOPDIR)/Kconfig.
> 
> I also prefer the generated Kconfig file.
> It keeps all these checks in a single place, instead of spreading it over all
> Kconfig files. This allows to keep better control over the list of checks, and
> notice when it gets out-of-hand.

I prefer the "option exec" approach, actually.  That way the shell-outs
are colocated with the code which uses them and they will only be executed
if you've actually selected that subsystem for building (I think?).

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