[POWER10] __morestack calls from pcrel code

[Alan Modra]

On Wed, Jul 21, 2021 at 08:59:04AM -0400, David Edelsohn wrote:
> On Wed, Jul 21, 2021 at 4:29 AM Alan Modra <amodra@gmail.com> wrote:
> >
> > On Wed, Jul 14, 2021 at 08:24:16PM -0400, David Edelsohn wrote:
> > > > > >     * config/rs6000/morestack.S (R2_SAVE): Define.
> > > > > >     (__morestack): Save and restore r2.  Set up r2 for called
> > > > > >     functions.
> > >
> > > This patch is okay.
> >
> > Thanks David, the patch is needed on gcc-11 and gcc-10 too.
> > OK for the branches too?
> 
> Backports are fine, but I believe that Richi is planning to cut GCC 11
> RC today, so you really should check with him about a backport at the
> last minute.

Hi Richard,
Is this patch OK at this late stage for the gcc-11 branch?
https://gcc.gnu.org/pipermail/gcc-patches/2021-June/573978.html

The impacts of the bug are segfaults and other undesirable behaviour
with Go (or more generally -fsplit-stack) on power10 when libgcc is
not power10 pcrel.  A non-pcrel libgcc is very likely how distros
will ship gcc.

-- 
Alan Modra
Australia Development Lab, IBM