linux-kernel - Re: [RFC] kbuild: drop use of "ld -r" for intermediate links of vmlinux

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Message-ID: <20140218214801.GA25163@ravnborg.org>
Date:	Tue, 18 Feb 2014 22:48:01 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Alan Modra <amodra@...il.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, mmarek@...e.cz,
	Cary Coutant <ccoutant@...gle.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [RFC] kbuild: drop use of "ld -r" for intermediate links of
 vmlinux

On Wed, Feb 19, 2014 at 01:28:56AM +1030, Alan Modra wrote:
> On Sun, Feb 16, 2014 at 09:37:24PM +0100, Sam Ravnborg wrote:
> > The trick used is that for each directory a linker script is
> > generated that name all the file to be linked - and for
> > sub-directories this is just the linker script for that directory.
> > 
> > The file continue to be named "built-in.o" but it is really a linker script.
> 
> You'll need binutils newer than 2012-06-25
> https://sourceware.org/ml/binutils/2012-06/msg00201.html
> 
> > I recall the idea is from someone else - but have long lost memory of
> > from where I saw it.
> 
> I think it might have been my idea originally, implemented by Stephen
> Rothwell.
Sounds right - added in cc:

> 
> Another possibility is to use thin archives to package up the objects.
> Thin archives are like normal archives except they just contain paths
> to the objects, not the object contents.  Paths are flattened when
> adding one thin archive to another.  I think Stephen may have tried
> that idea too.
I just coded this in a similar simple fashion.
It broke building vdso - needs to look into that and will get back when I may
understand why my link suddenly broke.

Thanks for the feedback!

	Sam
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