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From: "Yann E. MORIN" <yann.morin.1998@free.fr>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@kernel.org>,
	Kyungsik Lee <kyungsik.lee@lge.com>,
	Michal Marek <mmarek@suse.cz>,
	linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
	x86@kernel.org, celinux-dev@lists.celinuxforum.org,
	linux-arm-kernel@lists.infradead.org, hyojun.im@lge.com,
	chan.jeong@lge.com, raphael.andy.lee@gmail.com,
	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	Russell King <rmk@arm.linux.org.uk>,
	Borislav Petkov <bp@alien8.de>,
	Florian Fainelli <florian@openwrt.org>,
	Yann Collet <yann.collet.73@gmail.com>,
	Chanho Min <chanho.min@lge.com>
Subject: Re: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format
Date: Tue, 16 Jul 2013 10:08:07 +0200	[thread overview]
Message-ID: <201307161008.07643.yann.morin.1998@free.fr> (raw)
In-Reply-To: <20130716005611.e4ccab02.akpm@linux-foundation.org>

Andrew, All,

On Tuesday 16 July 2013 09:56:11 Andrew Morton wrote:
> On Tue, 16 Jul 2013 00:47:27 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> > On Mon, 15 Jul 2013 15:08:20 -0700 "H. Peter Anvin" <hpa@zytor.com> wrote:
> > > On 07/15/2013 03:03 PM, Andrew Morton wrote:
[--SNIP--]
> > > We keep running over the need to be able to have kconfig run tests on
> > > the build system (for toolchain support or for optional tools needed);
> > > running them in the Makefiles (i.e. at Kbuild time) is simply too late.
> > > 
> > 
> > Would it make sense to extend Kconfig's `depends'?
> > 
> > 	depends on $(shell-command)
> > 
> > I don't know how practical that would be to implement...

I'm afraid this will get rather ugly and not trivial.

Can we mix 'depends on SYMBOL' and 'depends on $(command)' ?
Can we mix both in a boolean expression such as 'depends on SYMBOL
&& $(command)' ?

What would be the condition for evaluating the dependency rule? Evaluation
at Kconfig read-time might not be enough, given this construct:

    config FOO
        depends on $(foo)
    comment "'foo' is missing, please install it"
        depends on !$(foo)

Also, I believe Kconfig should stay a config-only language, without
much esoteric features.

> Or, easier and faster, run some front-end script which generates
> once-off Kconfig symbols.
> 
> 	if [ -x /bin/lz4c ]
> 	then
> 		echo CONFIG_HAVE_LZ4C
> 	fi
> 
> then munge the output of that script into the Kconfig run and do
> 
> 	depends on HAVE_LZ4C

Yes, this is a better solution.

For what it's worth, this is what I'm doing in crosstool-NG: a script
checks for optional pre-requisites, spits out a Kconfig blob which is
included by the top-level Kconfig file.

Here is a snippet of generated Kconfig blob:
    config HAVE_XZ
        def_bool y
    config HAVE_LZMA
        bool

Which means we do have 'xz', but not 'lzma'. This is relatively trivial
to do, so I'll tackle this this evening when I'm back home (unless
someone beats me to it).

Regards,
Yann E. MORIN.

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +0/33 662376056 | Software  Designer | \ / CAMPAIGN     |   ^                |
| --==< O_o >==-- '------------.-------:  X  AGAINST      |  /e\  There is no  |
| http://ymorin.is-a-geek.org/ | (*_*) | / \ HTML MAIL    |  """  conspiracy.  |
'------------------------------'-------'------------------'--------------------'

WARNING: multiple messages have this Message-ID
From: yann.morin.1998@free.fr (Yann E. MORIN)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format
Date: Tue, 16 Jul 2013 10:08:07 +0200	[thread overview]
Message-ID: <201307161008.07643.yann.morin.1998@free.fr> (raw)
In-Reply-To: <20130716005611.e4ccab02.akpm@linux-foundation.org>

Andrew, All,

On Tuesday 16 July 2013 09:56:11 Andrew Morton wrote:
> On Tue, 16 Jul 2013 00:47:27 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> > On Mon, 15 Jul 2013 15:08:20 -0700 "H. Peter Anvin" <hpa@zytor.com> wrote:
> > > On 07/15/2013 03:03 PM, Andrew Morton wrote:
[--SNIP--]
> > > We keep running over the need to be able to have kconfig run tests on
> > > the build system (for toolchain support or for optional tools needed);
> > > running them in the Makefiles (i.e. at Kbuild time) is simply too late.
> > > 
> > 
> > Would it make sense to extend Kconfig's `depends'?
> > 
> > 	depends on $(shell-command)
> > 
> > I don't know how practical that would be to implement...

I'm afraid this will get rather ugly and not trivial.

Can we mix 'depends on SYMBOL' and 'depends on $(command)' ?
Can we mix both in a boolean expression such as 'depends on SYMBOL
&& $(command)' ?

What would be the condition for evaluating the dependency rule? Evaluation
at Kconfig read-time might not be enough, given this construct:

    config FOO
        depends on $(foo)
    comment "'foo' is missing, please install it"
        depends on !$(foo)

Also, I believe Kconfig should stay a config-only language, without
much esoteric features.

> Or, easier and faster, run some front-end script which generates
> once-off Kconfig symbols.
> 
> 	if [ -x /bin/lz4c ]
> 	then
> 		echo CONFIG_HAVE_LZ4C
> 	fi
> 
> then munge the output of that script into the Kconfig run and do
> 
> 	depends on HAVE_LZ4C

Yes, this is a better solution.

For what it's worth, this is what I'm doing in crosstool-NG: a script
checks for optional pre-requisites, spits out a Kconfig blob which is
included by the top-level Kconfig file.

Here is a snippet of generated Kconfig blob:
    config HAVE_XZ
        def_bool y
    config HAVE_LZMA
        bool

Which means we do have 'xz', but not 'lzma'. This is relatively trivial
to do, so I'll tackle this this evening when I'm back home (unless
someone beats me to it).

Regards,
Yann E. MORIN.

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +0/33 662376056 | Software  Designer | \ / CAMPAIGN     |   ^                |
| --==< O_o >==-- '------------.-------:  X  AGAINST      |  /e\  There is no  |
| http://ymorin.is-a-geek.org/ | (*_*) | / \ HTML MAIL    |  """  conspiracy.  |
'------------------------------'-------'------------------'--------------------'

  reply	other threads:[~2013-07-16  8:08 UTC|newest]

Thread overview: 110+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-06  8:42 [PATCH -next 1/2] arm: Remove enforced Os flag for LZ4 decompressor Kyungsik Lee
2013-05-06  8:42 ` Kyungsik Lee
2013-05-06  8:42 ` [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format Kyungsik Lee
2013-05-06  8:42   ` Kyungsik Lee
2013-05-06  9:51   ` Borislav Petkov
2013-05-06  9:51     ` Borislav Petkov
2013-07-10  8:12     ` Geert Uytterhoeven
2013-07-10  8:12       ` Geert Uytterhoeven
2013-07-10  8:12       ` Geert Uytterhoeven
2013-07-10  9:36       ` Borislav Petkov
2013-07-10  9:36         ` Borislav Petkov
2013-07-10  9:36         ` Borislav Petkov
2013-07-10 18:28         ` Markus Trippelsdorf
2013-07-10 18:28           ` Markus Trippelsdorf
2013-07-10 18:28           ` Markus Trippelsdorf
2013-07-10 18:28           ` Markus Trippelsdorf
2013-07-10 20:01           ` Borislav Petkov
2013-07-10 20:01             ` Borislav Petkov
2013-07-10 20:01             ` Borislav Petkov
2013-07-10 20:01             ` Borislav Petkov
2013-07-11  4:34           ` Kyungsik Lee
2013-07-11  4:34             ` Kyungsik Lee
2013-07-11  4:34             ` Kyungsik Lee
2013-07-11  4:34             ` Kyungsik Lee
2013-07-11  9:46             ` [PATCH] .gitignore: ignore *.lz4 files Markus Trippelsdorf
2013-07-11  9:46               ` Markus Trippelsdorf
2013-07-11  9:46               ` Markus Trippelsdorf
2013-07-11  9:46               ` Markus Trippelsdorf
2013-07-12  7:56   ` [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format Ingo Molnar
2013-07-12  7:56     ` Ingo Molnar
2013-07-12  8:01     ` Borislav Petkov
2013-07-12  8:01       ` Borislav Petkov
2013-07-12 10:13       ` Ingo Molnar
2013-07-12 10:13         ` Ingo Molnar
2013-07-12 10:23         ` Borislav Petkov
2013-07-12 10:23           ` Borislav Petkov
2013-07-12 11:18           ` Andrew Morton
2013-07-12 11:18             ` Andrew Morton
2013-07-12 12:06             ` Ingo Molnar
2013-07-12 12:06               ` Ingo Molnar
2013-07-12 12:13             ` Borislav Petkov
2013-07-12 12:13               ` Borislav Petkov
2013-07-12 12:34               ` Florian Fainelli
2013-07-12 12:34                 ` Florian Fainelli
2013-07-12 12:34                 ` Florian Fainelli
2013-07-12 12:46                 ` Borislav Petkov
2013-07-12 12:46                   ` Borislav Petkov
2013-07-12 12:46                   ` Borislav Petkov
2013-07-15 22:03     ` Andrew Morton
2013-07-15 22:03       ` Andrew Morton
2013-07-15 22:08       ` H. Peter Anvin
2013-07-15 22:08         ` H. Peter Anvin
2013-07-16  7:47         ` Andrew Morton
2013-07-16  7:47           ` Andrew Morton
2013-07-16  7:56           ` Andrew Morton
2013-07-16  7:56             ` Andrew Morton
2013-07-16  8:08             ` Yann E. MORIN [this message]
2013-07-16  8:08               ` Yann E. MORIN
2013-07-16  8:27               ` Andrew Morton
2013-07-16  8:27                 ` Andrew Morton
2013-07-16  9:05                 ` Borislav Petkov
2013-07-16  9:05                   ` Borislav Petkov
2013-07-16  9:12                   ` Yann E. MORIN
2013-07-16  9:12                     ` Yann E. MORIN
2013-07-16  9:22                     ` Borislav Petkov
2013-07-16  9:22                       ` Borislav Petkov
2013-07-16  9:32                       ` Yann E. MORIN
2013-07-16  9:32                         ` Yann E. MORIN
2013-07-16  9:38                         ` Borislav Petkov
2013-07-16  9:38                           ` Borislav Petkov
2013-07-16  9:45                           ` Yann E. MORIN
2013-07-16  9:45                             ` Yann E. MORIN
2013-07-16  9:59                             ` Borislav Petkov
2013-07-16  9:59                               ` Borislav Petkov
2013-07-16 10:04                               ` Florian Fainelli
2013-07-16 10:04                                 ` Florian Fainelli
2013-07-16 10:04                                 ` Florian Fainelli
2013-07-16 18:04               ` Sam Ravnborg
2013-07-16 18:04                 ` Sam Ravnborg
2013-07-17 21:16                 ` Sam Ravnborg
2013-07-17 21:16                   ` Sam Ravnborg
2013-07-17 21:44                   ` Borislav Petkov
2013-07-17 21:44                     ` Borislav Petkov
2013-07-17 22:30                   ` Yann E. MORIN
2013-07-17 22:30                     ` Yann E. MORIN
2013-07-17 23:22                     ` H. Peter Anvin
2013-07-17 23:22                       ` H. Peter Anvin
2013-07-18  8:02                       ` Geert Uytterhoeven
2013-07-18  8:02                         ` Geert Uytterhoeven
2013-07-18  8:02                         ` Geert Uytterhoeven
2013-07-18  7:22                     ` Geert Uytterhoeven
2013-07-18  7:22                       ` Geert Uytterhoeven
2013-07-18  7:22                       ` Geert Uytterhoeven
2013-07-18  7:34                       ` Andrew Morton
2013-07-18  7:34                         ` Andrew Morton
2013-07-18  7:34                         ` Andrew Morton
2013-07-18  7:47                         ` Yann E. MORIN
2013-07-18  7:47                           ` Yann E. MORIN
2013-07-18  7:47                           ` Yann E. MORIN
2013-07-18  7:52                           ` Andrew Morton
2013-07-18  7:52                             ` Andrew Morton
2013-07-18  7:52                             ` Andrew Morton
2013-07-18 20:47                     ` Sam Ravnborg
2013-07-18 20:47                       ` Sam Ravnborg
2013-07-16  9:13             ` Florian Fainelli
2013-07-16  9:13               ` Florian Fainelli
2013-07-16  9:13               ` Florian Fainelli
2013-07-16  9:25               ` Yann E. MORIN
2013-07-16  9:25                 ` Yann E. MORIN
2013-07-16  9:25                 ` Yann E. MORIN

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