linux-kernel - Re: Reducing debuginfo size by removing unneeded includes

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Message-ID: <20080224075821.GA7781@uranus.ravnborg.org>
Date:	Sun, 24 Feb 2008 08:58:21 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: Reducing debuginfo size by removing unneeded includes

Hi Andi.

On Mon, Feb 18, 2008 at 02:12:01PM +0100, Andi Kleen wrote:
> Arnaldo Carvalho de Melo <acme@...hat.com> writes:
> >
> > [acme@...pio net-2.6]$ l /tmp/sys_ia32.o.before /tmp/sys_ia32.o.after
> > -rw-rw-r-- 1 acme acme 185240 2008-02-06 19:19 /tmp/sys_ia32.o.after
> > -rw-rw-r-- 1 acme acme 248328 2008-02-06 19:00 /tmp/sys_ia32.o.before
> >
> > 	Almost 64KB only on this object file!
> 
> Just FYI, newer gcc does this in theory automatically when you specify 
> 
> -feliminate-unused-debug-types -feliminate-unused-debug-symbols
google did not turn up anything useful.
Do you have a poiter to where these are described?


> There is also -feliminate-dwarf2-dups, but it seems to even increase
> obj dir size. Also -feliminate-dwarf2-dups seems to generate a lot of 

Google only turned up a patch from Mark Mitchell removing this
in ~2001 timeframe.
So again a pointer would be nice.

I use FC8:
gcc --version
gcc (GCC) 4.1.2 20070925 (Red Hat 4.1.2-33)

So this is far behind trunk that you use - but I have not had any
real incentive to upgrade.

I would like to have a remote understanding of the options before
enabling them.

	Sam
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