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Subject: Re: powerpc/ppc64: Allow allmodconfig to build (finally !)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Guenter Roeck <linux@roeck-us.net>
Date: Thu, 15 May 2014 22:22:51 +1000
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Cc: Stephen Rothwell <sfr@canb.auug.org.au>, linuxppc-dev@lists.ozlabs.org,
 Alan Modra <amodra@gmail.com>
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On Thu, 2014-05-15 at 03:46 -0700, Guenter Roeck wrote:
> On 05/15/2014 02:47 AM, Alan Modra wrote:
> > On Wed, May 14, 2014 at 08:34:30AM -0700, Guenter Roeck wrote:
> >> Bummer. Confirmed, if I replace "@h" with "@high" in just one place,
> >> the builds pass with binutils 2.24. Unfortunately the same builds then
> >> fails with binutils 2.23.
> >>
> >> Any idea how to get it to compile with both old and new versions ?
> >
> > The standard way with GNU software would be to write a configure test,
> > that checks for @high support in the assembler, and defines a macro
> > if the assembler passes the check.  I'm not that familiar with the
> > linux kernel these days, but a little grepping around says that
> > something like
> >
> > ashigh := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
> > KBUILD_AFLAGS += $(ashigh)
> >
> > might work.
> >
> 
> Yes, it does.

Care to send a patch ? :-)

Cheers,
Ben.