DRAFT: Test modules sharing a symbol

[anbe42]

This does not work as expected, so I'm obviously missing something. Help welcome.
There are dkms modules out in the wild doing this, but I didn't have time to check them in detail.

...
*** Testing dkms modules with dependencies
Adding the prerequisite test module
Running dkms autoinstall
Adding test module with dependencies
Running dkms autoinstall
Error: command 'dkms autoinstall -k 6.11.7-amd64' returned status 11 instead of expected 0

Sign command: /lib/modules/6.11.7-amd64/build/scripts/sign-file
Signing key: /var/lib/dkms/mok.key
Public certificate (MOK): /var/lib/dkms/mok.pub

Cleaning build area... done.
Building module(s)...(bad exit status: 2)
Failed command:
make -j1 KERNELRELEASE=6.11.7-amd64 -C /lib/modules/6.11.7-amd64/build M=/var/lib/dkms/dkms_dependencies_test/1.0/build

Error! Bad return status for module build on kernel: 6.11.7-amd64 (x86_64)
Consult /var/lib/dkms/dkms_dependencies_test/1.0/build/make.log for more information.
Autoinstall on 6.11.7-amd64 succeeded for module(s) dkms_test.
Autoinstall on 6.11.7-amd64 failed for module(s) dkms_dependencies_test(10).

Error! One or more modules failed to install during autoinstall.
Refer to previous errors for more information.

DKMS make.log for dkms_dependencies_test/1.0 for kernel 6.11.7-amd64 (x86_64)
Mon Dec 16 23:00:16 UTC 2024
make: Entering directory '/usr/src/linux-headers-6.11.7-amd64'
  CC [M]  /var/lib/dkms/dkms_dependencies_test/1.0/build/dkms_dependencies_test.o
  MODPOST /var/lib/dkms/dkms_dependencies_test/1.0/build/Module.symvers
ERROR: modpost: "dkms_test_exported_function" [/var/lib/dkms/dkms_dependencies_test/1.0/build/dkms_dependencies_test.ko] undefined!
make[2]: *** [/usr/src/linux-headers-6.11.7-common/scripts/Makefile.modpost:145: /var/lib/dkms/dkms_dependencies_test/1.0/build/Module.symvers] Error 1
make[1]: *** [/usr/src/linux-headers-6.11.7-common/Makefile:1903: modpost] Error 2
make: *** [/usr/src/linux-headers-6.11.7-common/Makefile:236: __sub-make] Error 2
make: Leaving directory '/usr/src/linux-headers-6.11.7-amd64'