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

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Message-ID: <20070910120140.GA29077@uranus.ravnborg.org>
Date:	Mon, 10 Sep 2007 14:01:40 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	kai@...maschewski.name, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] build system: section garbage collection for vmlinux

> 
> > 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?

That would also free us from modifying a lot of arch linker scripts uglifying
them even more than they are today.

	Sam
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