kernel module can't link to static lib.a on fedora 30.

[zhichen.Wang]

Same to https://stackoverflow.com/questions/56926632/how-do-i-link-a-static-library-...
lib.a is create by "3.5 Library file goals - lib-y" see "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/Docume...".

Kernel version:5.0.9-301.fc30.x86_64 
My makefile:
c-objs := b.o a.o libxxx.a libxx.a
obj-m := c.o

[zhichen.Wang]

Work well on fedora 26, I think kbuild changed and not process ".a" files.

[sixpack13]

saw a simular error month ago - can't find it anymore -

the solution was to sudo dnf install glibc-static

- don't know if it helps here too -