From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yann E. MORIN <yann.morin.1998@free.fr>
Date: Fri, 3 Apr 2015 00:06:12 +0200
Subject: [Buildroot] [PATCH 1/1 v2] build host lz4 to support lz4
 compression in the kernel.
In-Reply-To: <20150402000158.0b85c847@free-electrons.com>
References: <1427919153-16080-1-git-send-email-sagaert.johan@proximus.be>
 <20150401223752.0fd358cf@free-electrons.com>
 <551C6935.3050401@mind.be>
 <20150402000158.0b85c847@free-electrons.com>
Message-ID: <20150402220612.GD4229@free.fr>
List-Id: <buildroot.busybox.net>
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To: buildroot@busybox.net

Thomas, All,

On 2015-04-02 00:01 +0200, Thomas Petazzoni spake thusly:
> On Wed, 01 Apr 2015 23:55:01 +0200, Arnout Vandecappelle wrote:
> 
> >  Well, I'm in agreement with Johan's earlier statement that the overhead of the
> > host-lz4 build is negligible. It takes 20 seconds on my laptop, of which 6 are
> > buildroot overhead from parsing package/*/*.mk.
> 
> 20 seconds, plus the host-lzop build time that we already build
> unconditionally.
> 
> >  Peter said before that all this hacking of linux (or other) config files should
> > be avoided, and I agree.
> 
> Correct, except when it's related to needed dependencies in Buildroot.
> 
> But if that's fine for everyone, I'm OK with merging an unconditional
> host-lz4 dependency. I'll just follow what the consensus is on this
> matter, since I don't feel like arguing too much on this
> not-so-important issue.
> 
> Thanks for the feedback, definitely very useful to have the opinion of
> others to help take a decision.

Well, I always find it very frustrating to build something that I do not
use. 20 seconds is an eternity (even the 15-or-so it takes here).

Also, I see a lot of people doing this use-case, and being quite
frustrated:

    make foo_defconfig
    make linux-menuconfig
    [Bam, 20s overhead, 35s on slower machines]

Otherwise, 15s for a lzo, yet another 10s for lz4. What next?

I would side with Thomas: add an entry in the Buildroot menuconfig to
configure what compression to use.

My 2-cent advice... ;-)

Regards,
Yann E. MORIN.

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