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

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Message-ID: <20080224090750.GB8169@uranus.ravnborg.org>
Date:	Sun, 24 Feb 2008 10:07:50 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Samuel Tardieu <sam@...1149.net>
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

On Sun, Feb 24, 2008 at 09:25:19AM +0100, Samuel Tardieu wrote:
> Andy> -feliminate-unused-debug-types -feliminate-unused-debug-symbols
> Andy> -feliminate-dwarf2-dups
> 
> Sam> google did not turn up anything useful.  Do you have a poiter to
> Sam> where these are described?
> 
> >From GCC (svn) man page:
> 
>    -feliminate-unused-debug-symbols
>        Produce debugging information in stabs format (if that is sup‐
>        ported), for only symbols that are actually used.
> 
>    -feliminate-unused-debug-types
>        Normally, when producing DWARF2 output, GCC will emit debugging
>        information for all types declared in a compilation unit, regard‐
>        less of whether or not they are actually used in that compilation
>        unit.  Sometimes this is useful, such as if, in the debugger, you
>        want to cast a value to a type that is not actually used in your
>        program (but is declared).  More often, however, this results in a
>        significant amount of wasted space.  With this option, GCC will
>        avoid producing debug symbol output for types that are nowhere used
>        in the source file being compiled.
> 
>    -feliminate-dwarf2-dups
>        Compress DWARF2 debugging information by eliminating duplicated
>        information about each symbol.  This option only makes sense when
>        generating DWARF2 debugging information with -gdwarf-2.
> 

Hi Sam.

I did not include the '-f' part in my google search. When I did so I got more hits.

Thanks,
	Sam - who is not talking to himself ;-)
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