linux-kernel - Re: [PATCH v2 0/4] Add support for compiling with -ffunction-sections -fdata-sections

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Message-ID: <49EF01B4.6000406@redhat.com>
Date:	Wed, 22 Apr 2009 07:38:28 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Anders Kaseorg <andersk@....EDU>
CC:	Américo Wang <xiyou.wangcong@...il.com>,
	Tim Abbott <tabbott@....EDU>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Waseem Daher <wdaher@....EDU>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Jeff Arnold <jbarnold@....EDU>
Subject: Re: [PATCH v2 0/4] Add support for compiling with	-ffunction-sections
 -fdata-sections

Anders Kaseorg wrote:
> On Tue, 21 Apr 2009, Américo Wang wrote:
>> Nice work! But, don't -ffunction-sections and -fdata-sections have
>> collisions with '-g' and 'gprof'? Just like what gcc(1) describes.
> 
> That description seems to be long obsolete.  gcc used to warn that 
> -ffunction-sections may affect debugging, but that warning was disabled 
> for ELF targets in 1999, presumably because ELF has always supported 
> arbitrary section names even though some other object formats have issues.
>   <http://gcc.gnu.org/ml/gcc-patches/2008-03/msg00975.html>
> 
> I know that debugging under -ffunction-sections -g works fine on at least 
> x86, which is the only platform on which we currently propose to provide 
> this option, and based on that message it looks like other platforms are 
> fine too.

Would you know actual version of gcc from which supports the combination of
-ffunction-sections and -g?

Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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