[22.04 FEAT] gcc tunings for power9

[James O'Connor]

This is an Ubuntu-power-systems 22.04 LTS feature bug to track changing the gcc configure options from --with-cpu=power8 to --with-cpu=power9.

Prerequisites for this bug include power9 builder hardware in Canonical datacenter.

I'm still learning my way around Debian/Ubuntu source so go easy on me if this isn't the correct branch:

https://salsa.debian.org/toolchain-team/gcc/-/blob/gcc-10-debian/debian/rules2#L394

But we'll want to add some logic around line 394 to add --with-cpu=power9 for 22.04 and possibly --with-tune=? but I'll reverse mirror this bug and verify with our IBM Power toolchain architect.

[James O'Connor (jpoc)]

After the 22.04 gcc toolchain is rebuilt for power9 there will be a mass 22.04 package rebuild for power (ppc64el).

[Matthias Klose (doko)]

yes, the defaults change should be specific to a release.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1930086

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Matthias Klose (doko)]

now built in jammy-proposed