linux-kernel - Re: [PATCH] Configure out DMI scanning code v2 (Linux Tiny)

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Date:	Tue, 1 Apr 2008 15:09:28 -0500
From:	Rob Landley <rob@...dley.net>
To:	linux-tiny@...enic.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Reynes Philippe <tremyfr@...oo.fr>, hpa@...or.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de
Subject: Re: [PATCH] Configure out DMI scanning code v2 (Linux Tiny)

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.
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