[19.11][20.11][21.11] ppc64 fixes backport

[Thomas Monjalon]

06/07/2022 20:53, Luca Boccassi:
> On Wed, 29 Jun 2022 at 14:40, Xueming(Steven) Li <xuemingl at nvidia.com> wrote:
> >
> > Hi LTS maintainers,
> >
> > Confirmed with Thomas, mlx5 PMD needs the following patches to compile with the upstream rdma-core lib.
> >
> > 2022-05-25 2022-06-01 b251bb7630  eal/ppc: undefine AltiVec keyword vector      @Thomas Monjalon
> > 2022-05-03 2022-05-25 64fcadeac0  avoid AltiVec keyword vector  @Thomas Monjalon
> >
> > I tried to backport to 20.11.6 LTS, cherry-pick works without conflicts.
> >
> > Best Regards,
> > Xueming Li
> 
> Hi,
> 
> This patch:
> 
> 2022-05-25 2022-06-01 b251bb7630  eal/ppc: undefine AltiVec keyword
> vector      @Thomas Monjalon
> 
> Looks like an incompatible change? Commit message says so too:
> 
> "This is a compatibility breakage for applications which were using
> the keyword "vector" for its AltiVec meaning."
> 
> The first one looks like but I don't think we should pick up the
> second one for the LTS branches?

Yes if we undefine "vector", we break applications using this syntax.
That's a required change for recent rdma-core which uses the name "vector"
for another purpose.
I don't know what is best/worst.