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

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Message-Id: <2008-02-24-09-25-19+trackit+sam@rfc1149.net>
Date:	Sun, 24 Feb 2008 09:25:19 +0100
From:	Samuel Tardieu <sam@...1149.net>
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

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.

 Sam
-- 
Samuel Tardieu -- sam@...1149.net -- http://www.rfc1149.net/

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