This bug was fixed in the package v4l2loopback - 0.12.7-2ubuntu2
---------------
v4l2loopback (0.12.7-2ubuntu2) kinetic; urgency=medium
* Preserve CC setting when invoking sub-make, to ensure module can be
built correctly with the kernel's custom compiler. Fixes FTBFS in
hwe-5.19 build. LP: #1991664
-- Dimitri John Ledkov <[email protected]> Thu, 06 Oct 2022
15:01:47 +0100
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https://bugs.launchpad.net/bugs/1991664
Title:
backport dkms fixes to build modules correctly for hwe-5.19+ kernels
with custom compiler
Status in backport-iwlwifi-dkms package in Ubuntu:
Fix Released
Status in dkms package in Ubuntu:
In Progress
Status in linux package in Ubuntu:
Incomplete
Status in v4l2loopback package in Ubuntu:
Fix Released
Status in zfs-linux package in Ubuntu:
Fix Released
Status in backport-iwlwifi-dkms source package in Jammy:
New
Status in dkms source package in Jammy:
Fix Committed
Status in linux source package in Jammy:
Incomplete
Status in v4l2loopback source package in Jammy:
New
Status in zfs-linux source package in Jammy:
New
Bug description:
[ Impact ]
* hwe-5.19 kernel has to be compiled with gcc-12+ for the new
security kernel config options that have been enabled in that kernel
(init zero structs).
* dkms needs to be patched to attempt to use the same compiler as was
used to build the kernel, specifically use gcc for v5.15 but gcc-12
for v5.19+ in jammy
* dkms autopkgtests also need to be improved to ensure there are no
false negatives when kernel has module under test already built-in at
the same version.
* because linux-headers packages in Ubuntu do not depend on a
toolchain, and it is very hard to correctly depend on a native or
cross-toolchain, add gcc-12 dependency in the dkms package.
[ Test Plan ]
* Retrigger dkms module test for a built-in package of the same
version as already built into the kernel, for example zfs-linux dkms.
It should pass.
* Attempt to build dkms modules against v5.15 kernel and v5.19 kernel
from proposed. dkms module should be built with gcc and gcc-12
respectively.
[ Where problems could occur ]
* New gcc-12 dependency on the dkms package may result in two
compilers being installed in the Ubuntu Desktop Live image
* New gcc-12 dependency may prevent automatic upgrade/installation of
the dkms package update via unattended upgrades.
[ Other Info ]
* It is questionable for dkms to depend on any c-compiler, given that
a module for a given kernel can really be built with the same
toolchain and the same compiler features.
* In debian, linux kernel packages ship and extra configuration file
in the kernel headers, dkms uses said configuration file to use a
matching compiler, and linux-headers packages depend on the toolchain
used to build a given kernel. Maybe in the future Ubuntu could
consider using the same packaging.
* Some DKMS modules need further fixes to preserve and not loose the
compiler setting
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