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From: Rob Landley <rob@landley.net>
To: linux-tiny@selenic.com
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Reynes Philippe <tremyfr@yahoo.fr>,
	hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@elte.hu,
	tglx@linutronix.de
Subject: Re: [PATCH] Configure out DMI scanning code v2 (Linux Tiny)
Date: Tue, 1 Apr 2008 15:09:28 -0500	[thread overview]
Message-ID: <200804011509.28842.rob@landley.net> (raw)
In-Reply-To: <20080401120036.2254d7eb.akpm@linux-foundation.org>

On Tuesday 01 April 2008 14:00:36 Andrew Morton wrote:
>    text    data     bss     dec     hex filename
> 1614279  210524  159992 1984795  1e491b vmlinux
>
> but when I remove the ifdefs around the tables and rely on the compiler
> removing the code and data I get
>
>    text    data     bss     dec     hex filename
> 1614447  210972  159992 1985411  1e4b83 vmlinux
>
> An additional 616 bytes of useless stuff.
>
> Ingo, I think there was some trick to making this work right.  Do you
> recall?

Does bloat-o-meter say what the additional 616 bytes _is_?

scripts/bloat-o-meter vmlinux.old vmlinux.new

P.S.  What busybox did:

    ifneq ($(strip $(CONFIG_DEBUG)),y)
        OPTIMIZATION+=$(call check_cc,
$(CC),-ffunction-sections -fdata-sections,)
        CHECKED_LDFLAGS += $(call check_ld,$(LD),--gc-sections,)
    endif

Tells gcc to put each function and each global into its own ELF section, and 
then told the linker to garbage collect unused sections...

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.

      reply	other threads:[~2008-04-01 20:09 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-12  9:04 Thomas Petazzoni
2008-02-12 18:56 ` Matt Mackall
2008-02-12 20:08   ` Andrew Morton
2008-02-17 17:59     ` Ingo Molnar
2008-04-01 19:00 ` Andrew Morton
2008-04-01 20:09   ` Rob Landley [this message]

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