Bumping the baseline on ppc64el in jammy to POWER9

[Christian Ehrhardt]

On Thu, Dec 9, 2021 at 2:25 PM Matthias Klose <doko at ubuntu.com> wrote:
>
> This weekend, we will bump the baseline for the ppc64el architecture to POWER9.
> A test compiler (gcc-11) for jammy can be found at
>
>   https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/p9
>
> We will not do an explicit test rebuild for that change, but do the first test
> rebuild during the Xmas/New Year breaks with this p9 default.  If bugs are found
> with these defaults,
>
>  - fix the bug if possible
>
>  - file a bug report with the tag "power9"
>
>  - if a fix is urgently needed, file the bug report as
>    above, and then upload the package with a workaround
>    defaulting to the previous baseline:
>
>      -march=power8 -mtune=power9

Hi Doko,
to understand this right, the new will be -march=power9 then?

If yes, that implies that any power8 test machine won't be usable for >=jammy.
I just wanted to spell this out so that the implication is clear since
I think while
P8 machines are old they are in common use as test system AFAIK.


> Matthias
>
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-- 
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd