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

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Message-ID: <20080224122335.GB13637@one.firstfloor.org>
Date:	Sun, 24 Feb 2008 13:23:35 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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

> > 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?

info gcc

> 
> 
> > 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.


It's in my info pages for SUSE gcc 4.1. I didn't think it was
a SUSE extension though.


I also checked and all options are in gcc head and in gcc 4.3

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

Right now they are not useful to enable because they don't save
file size and in some cases make it even worse. I checked with some gcc 
developers and they explained why that is so. gcc would need to be fixed first.

-Andi

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