linux-kernel - Re: [PATCH 3/3] build system: section garbage collection for vmlinux

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Message-Id: <200709102002.15383.vda.linux@googlemail.com>
Date:	Mon, 10 Sep 2007 20:02:15 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] build system: section garbage collection for vmlinux

On Monday 10 September 2007 13:01, Sam Ravnborg wrote:
> > 
> > > Doing a normal kernel build will link vmlinux three or four times.
> > > If we introduce --gc-sections we should add a preparational link of
> > > vmlinux where we use --gc-sections and skip it for the rest of the links
> > > assuming that --gc-sections takes some time for ld to do.
> > 
> > Yes, this will speed up things a bit.
> 
> If we do the --gc-sections trick during the preparational link then we do
> not use the arch supplied linker script.
> Will it be possible to create a dedicated linker script that is valid
> for all architectures and which only include the KEEP() directives for
> the diverse sections?

Unfortunately, -r and --gc-sections don't mix.

x86_64-pc-linux-gnu-ld: --gc-sections and -r may not be used together
--
vda
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