Subject: Re: PowerPC64 future proof kernel toc, revised for lld

From: Alan Modra <[email-masked]>
Date: Thu, 11 Mar 2021 10:11:35 +1030

On Wed, Mar 10, 2021 at 01:44:57PM +0100, Christophe Leroy wrote:
> 
> 
> Le 10/03/2021 à 13:25, Alan Modra a écrit :
> > On Wed, Mar 10, 2021 at 08:33:37PM +1100, Alexey Kardashevskiy wrote:
> > > One more question - the older version had a construct "DEFINED (.TOC.) ?
> > > .TOC. : ..." in case .TOC. is not defined (too old ld? too old gcc?) but the
> > > newer patch seems assuming it is always defined, when was it added? I have
> > > the same check in SLOF, for example, do I still need it?
> > 
> > .TOC. symbol support was first added 2012-11-06, so you need
> > binutils-2.24 or later to use .TOC. as a symbol.
> > 
> 
> As of today, minimum requirement to build kernel is binutils 2.23, see https://www.kernel.org/doc/html/latest/process/changes.html#current-minimal-requirements

Yes, and arch/powerpc/Makefile complains about 2.24.  So for powerpc
that means you need to go to at least 2.25.  Oh the horror of needing
such new tools!

-- 
Alan Modra
Australia Development Lab, IBM