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Date: Fri, 24 Feb 2012 18:52:19 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] build: allow turning off debuginfo
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-devel@nongnu.org

On 02/24/12 12:16, Peter Maydell wrote:
> On 24 February 2012 10:39, Gerd Hoffmann <kraxel@redhat.com> wrote:
>> On 02/08/12 13:54, Gerd Hoffmann wrote:
>>> This patch adds --{enable,disable}-debug-info switches to configure
>>> which allows to include/exclude the '-g' switch on the gcc & ld
>>> command lines.  Not building debug info reduces ressource usage
>>> (especially disk) alot and is quite useful for test builds.
>>
>> ping?
> 
> We've had this suggested before, haven't we? I quite like the
> existing "just build with -g and strip it later" approach...
> is the resource usage change really that significant?

Disk usage is factor ten:

[kraxel@mort qemu]$ du -sh build-*
1,7G    build-debug
173M    build-nodebug

Build time is factor two:

[build-debug]
7263.45user 805.85system 3:11:03elapsed 70%CPU (0avgtext+0avgdata
1782576maxresident)k
72784880inputs+13340840outputs (1273066major+29668783minor)pagefaults 0swaps

[build-nodebug]
5329.72user 320.46system 1:34:26elapsed 99%CPU (0avgtext+0avgdata
1542848maxresident)k
116000inputs+755248outputs (255major+16535699minor)pagefaults 0swaps

cheers,
  Gerd