Multiple Undefined errors when trying to compile hid-tmff2/deps/hid-tminit/hid-tminit-new.ko

[mattmcadoo]

$ make
make -C deps/hid-tminit KDIR="/lib/modules/6.10.6-gentoo-x86_64/build"
make[1]: Entering directory '/home/mcadoo/git/hid-tmff2/deps/hid-tminit'
make -C /lib/modules/6.10.6-gentoo-x86_64/build M=/home/mcadoo/git/hid-tmff2/deps/hid-tminit modules
make[2]: Entering directory '/usr/src/linux-6.10.6-gentoo'
  CC [M]  /home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit.o
  CC [M]  /home/mcadoo/git/hid-tmff2/deps/hid-tminit/tminit.o
  LD [M]  /home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.o
  CC [M]  /home/mcadoo/git/hid-tmff2/deps/hid-tminit/usb-tminit.o
  LD [M]  /home/mcadoo/git/hid-tmff2/deps/hid-tminit/usb-tminit-new.o
  MODPOST /home/mcadoo/git/hid-tmff2/deps/hid-tminit/Module.symvers
ERROR: modpost: "__hid_register_driver" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "memcpy" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "kfree" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "usb_get_intf" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "hid_hw_stop" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "usb_interrupt_msg" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "usb_put_dev" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "__stack_chk_fail" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "usb_get_dev" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
ERROR: modpost: "usb_submit_urb" [/home/mcadoo/git/hid-tmff2/deps/hid-tminit/hid-tminit-new.ko] undefined!
WARNING: modpost: suppressed 35 unresolved symbol warnings because there were too many)
make[4]: *** [scripts/Makefile.modpost:145: /home/mcadoo/git/hid-tmff2/deps/hid-tminit/Module.symvers] Error 1
make[3]: *** [/usr/src/linux-6.10.6-gentoo/Makefile:1886: modpost] Error 2
make[2]: *** [Makefile:240: __sub-make] Error 2
make[2]: Leaving directory '/usr/src/linux-6.10.6-gentoo'
make[1]: *** [Makefile:4: all] Error 2
make[1]: Leaving directory '/home/mcadoo/git/hid-tmff2/deps/hid-tminit'
make: *** [Makefile:16: deps/hid-tminit] Error 2

commit 580cabe
6.10.6-gentoo-x86_64 kernel

$ gcc --version
gcc (Gentoo Hardened 14.2.1_p20240817 p4) 14.2.1 20240817

[Kimplul]

Did you configure your kernel yourself? I had a go at installing Gentoo, but the pre-configured gentoo-kernel seems to be at version 6.6.47 and has a different suffix (-gentoo-dist versus your -gentoo-x86_64). gentoo-kernel seems to build the module just fine.

[mattmcadoo]

Yes, it's a kernel configuration I've tailored to my system. Using the latest sys-kernel/gentoo-sources at 6.10.6.

[mattmcadoo]

kernel config
kernel-config-6.10.6-gentoo-x86_64.gz

[Kimplul]

Thanks, I can try playing around with the config and see if I can replicate. I'm assuming there's some parameter that's not set, possibly HID_something or maybe something related to modules, not sure. I'm unfortunately a bit busy at the moment but I hope I can get to it by the end of the week. Of course, feel free to look around yourself if you feel like it.

[mattmcadoo]

Has GCC 14.2 been tested on compiling the module?

[Kimplul]

Yep, at least Debian Testing's gcc (Debian 14.2.0-1) 14.2.0 works.

[Kimplul]

Okay, I snooped around a little, as a treat. I noticed that Modules.symvers in /usr/src/linux (with your config + 6.10.6 sources eselected) was empty for whatever reason. Modules.symvers is the file that modpost uses to link external modules (if I understand it correctly). Running ./scripts/mod/modpost -M -o Module.symvers -T modules.order vmlinux.o from /usr/src/linux populates Module.symvers and the module compilation succeeds, but it's still a bit unclear to me why this doesn't happen automatically.

EDIT: Fixed the ./scripts/mod/modpost command. Apparently they differ between 6.6.47 vs 6.10.6, with 6.6.47 being

./scripts/mod/modpost -M        -o Module.symvers -T modules.order vmlinux.o

and 6.10.6

./scripts/mod/modpost -M -m       -o Module.symvers -T modules.order -t  vmlinux.o

with the newer version producing an empty file, and the older one populating Modules.symvers as expected. At first I accidentally copied the newer command because I thought they would be identical, but I had actually used the older one.

[Kimplul]

Alright, TRIM_UNUSED_KSYMS was =y, switched it to be =n, that seems to get the module compiling as it should. TRIM_UNUSED_KSYMS just adds the -t option to scripts/mod/modpost, as the name suggests, trimming out unused exports. In this case I guess it trims out all exports.

[mattmcadoo]

Nice! I'm looking forward to trying it out when you get things pushed over.

[Kimplul]

TRIM_UNUSED_KSYMS is in your kernel config. You should change it, recompile, reinstall, grub-mkconfig, etc. Nothing I can really do about it. Guess I was a bit vague.

[Kimplul]

Doing some winter cleanup, I never got a confirmation that my suggestion worked but if it didn't, feel free to reopen.