Bumping the baseline on ppc64el in jammy to POWER9

[Matthias Klose]

On 12/9/21 15:24, Christian Ehrhardt wrote:
> 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.

yes, that's correct.

Matthias