[Bug 2051457] Re: Jammy 22.04.3 gcc compiler no longer builds modules for 6.5.0 kernel series

[Ubfan]

Testing was done with the Ubuntu 22.04.1 ISO, booted off disk, no persistence.
The Nvidia GPU was an RTX 3080 (mobile).
The gcc-12 and the generic hwe packages were installed, then the Nvidia
driver 535 selected in the Software & Updates/Additional Drivers tab.  Clicked
the apply button, and the nvidia.ko module(s) build successfully using gcc-12.
The build was done while running the default 5.15 kernel, and succeeded whether or
not gcc-11 was even present. 

Steps Taken
1)Boot the Ubuntu 22.04.1 Desktop ISO. The default kernel used is 5.15.
2)Set up wireiess.
3)In Software & Updates, add the universe and multiverse repositories. Click on
"update" button when presented.
4)sudo apt update  (Just in case)
5)sudo apt install gcc-12 build-essential
(Note, the Nvidia module will still build without the build-essential package, and its /bin/gcc link. )
6)Install the generic hwe packages. Note, using the hwe packages without "generic" in their
names immediately failed on the Nvidia module creation step. This installed the 6.5.0-15 kernel.
sudo apt install linux-generic-hwe-22.04 linux-headers-generic-hwe-22.04 linux-image-generic-hwe-22.04
7)In Software & Updates, under the Additional Drivers tab, select Nvidia 535. Click on the apply button, and watch the progress bar. No errors should occur.
8)Examine the nvidia.ko module created.
strings /lib/modules/6.5.0-15-generic/kernel/nvidia-535/nvidia.ko |grep gcc
The output should include that gcc 12.3 was used. (Whether or not /bin/gcc ->gcc-11 is even present.)

Did not try a reboot, since persistence was not even used.  The test was
quick since everything is in memory.

It looks like just the presence of gcc-12 will solve this problem, and
that may be addressed by adding a dependency on it to some (hwe, kernel
?) package.

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https://bugs.launchpad.net/bugs/2051457

Title:
  Jammy 22.04.3 gcc compiler no longer builds modules for  6.5.0 kernel
  series

Status in dkms package in Ubuntu:
  New
Status in gcc-defaults package in Ubuntu:
  Won't Fix

Bug description:
  Since Jammy went to the 6.5.0 kernel series, that kernel series was
  compiled with gcc-12. The previous 6.2.0 series kernels were compiled
  with gcc-11.

  The current version of gcc in jammy is 11.4.

  Many NVidia drivers, wifi drivers, VirtualBox (from our Repo), etc
  fail to build the modules, because of a gcc compiler version mismatch
  between what the current running kernel was built by, and the module
  being built.

  I recognized this while helping Users with NVidia driver compile errors on the forum, and came up with this work-around for them:
  https://ubuntuforums.org/showthread.php?t=2494273&p=14175164#post14175164

  Summary:
  Install gcc-12 & g++-12 on 22.04.3 and use it as the compiler.

  Since then, this work-around has helped to resolve problems with
  running the 6.5.0 series kernels and building modules for other
  applications and hardware drivers: VirtualBox, WiFi Drivers, etc. for
  use with the 6.5.0 series.

  I have run this for over a month as my default with no ill affects. I
  have continued to recommend this work-around to many user to solve
  their problems...

  *** I think it is time to look at pushing through gcc-12 as the
  default compiler for 22.04.3 through the normal updates channel.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: gcc 4:11.2.0-1ubuntu1
  ProcVersionSignature: Ubuntu 6.5.0-14.14~22.04.1-generic 6.5.3
  Uname: Linux 6.5.0-14-generic x86_64
  NonfreeKernelModules: zfs nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CloudArchitecture: x86_64
  CloudID: none
  CloudName: none
  CloudPlatform: none
  CloudSubPlatform: config
  CurrentDesktop: GNOME
  Date: Sun Jan 28 08:23:37 2024
  InstallationDate: Installed on 2022-09-19 (496 days ago)
  InstallationMedia: Ubuntu-Server 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809)
  SourcePackage: gcc-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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