This bug was fixed in the package dkms - 3.0.8-3
---------------
dkms (3.0.8-3) unstable; urgency=high
* Revert back to 3.0.8-1 behavior to prevent breakages for sid users
(Closes: #1025214, #1025171)
-- Aron Xu <[email protected]> Fri, 02 Dec 2022 19:49:16 +0800
** Changed in: dkms (Ubuntu Lunar)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1997841
Title:
More dkms fixes for exact cc compiler
Status in dkms package in Ubuntu:
Fix Released
Status in dkms source package in Jammy:
New
Status in dkms source package in Kinetic:
New
Status in dkms source package in Lunar:
Fix Released
Bug description:
[ Impact ]
* Previously
https://bugs.launchpad.net/ubuntu/+source/dkms/+bug/1991664 has fixed
up some dkms modules that use makefiles without setting a CC= variable
inside them. However, there is a class of dkms modules that set a CC=
variable inside the makefile, and then the environment variable is
ignored, thus resulting in hwe-5.19 dkms modules to FTBFS.
* Fix those by setting MAKEFLAGS="--environment-overrides" to really
ensure that environmental variable compiler is really being used.
Observe the following:
$ cat Makefile.just-cc
all:
echo $(CC)
$ cat Makefile.cc-set
CC=cc-set-in-makefile
all:
echo $(CC)
# cmdline override works in both cases
$ make -f Makefile.just-cc CC=make-var-cmdline
echo make-var-cmdline
make-var-cmdline
$ make -f Makefile.cc-set CC=make-var-cmdline
echo make-var-cmdline
make-var-cmdline
# environment/shell variable override only works in one of them
$ CC=env-cc make -f Makefile.just-cc
echo env-cc
env-cc
$ CC=env-cc make -f Makefile.cc-set
echo cc-set-in-makefile
cc-set-in-makefile
# unless environment-overrides is set
$ MAKEFLAGS=--environment-overrides CC=env-cc make -f Makefile.cc-set
echo env-cc
env-cc
[ Test Plan ]
* Divert /usr/bin/gcc to /bin/false
$ sudo ln -sf /bin/false /usr/bin/gcc
* Install a v5.19 kernel that must be built with gcc-12 and a dkms
module that uses a CC variable set inside its makefile
$ sudo apt install linux-virtual-hwe-22.04-edge gost-crypto-dkms
* Check that dkms status has the module successfully installed for v5.19
kernel
$ dkms status
[ Where problems could occur ]
* dkms cleans environment of all tool-chain related variables
already, but MAKEFLAGS=--environment-overrides may result in
additional/new/unexpected variables leaking into the dkms module
build, which were previously ignored.
* A better solution might be for our kernel builds to emit a makefile
snippet that is included by the Kbuild makefiles, but that too will
only cover a subset of dkms modules, not all of them.
* It might be nice if environment-overrides command line option of
make accepted a list of allowed variables that are desired to be
honored from the environment.
[ Other Info ]
* Any better suggestions of how to handle toolchain export would be welcome
here, as this is starting to be silly.
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