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

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Message-ID: <20140220170209.GA5103@ravnborg.org>
Date:	Thu, 20 Feb 2014 18:02:09 +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 11:31:00AM +1030, Alan Modra wrote:
> On Tue, Feb 18, 2014 at 10:48:01PM +0100, Sam Ravnborg wrote:
> > > 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.
> 
> Missing --whole-archive?

No - at least something else to begin with.
A special liker script is used when building the vdsp files for x86 - and the
linker script is ignored as such when embedded in a .o file with ar it seems.
This is not a big suprise.

The makefile magic used for the vdso part of the kernel needs a bit more coffee
than what is good for me for now...
Will look at it again later.

Thanks for the feedback.

	Sam
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