Hi! The question of building custom Linux kernel modules was recently brought up in bug #35758 (packaging CDEmu).
I'll summarize: a typical Makefile to build a kernel module looks like
this:
--8<---------------cut here---------------start------------->8---
VHBA_VERSION := 20170610
KERNELRELEASE ?= $(shell uname -r)
KDIR ?= /lib/modules/$(KERNELRELEASE)/build
PWD ?= $(shell pwd)
obj-m := vhba.o
ccflags-y := -DVHBA_VERSION=\"$(VHBA_VERSION)\" -Werror
default: modules
install: modules_install
modules modules_install clean:
$(MAKE) -C $(KDIR) M=$(PWD) $@
--8<---------------cut here---------------end--------------->8---
The only thing we need, beside a C compiler, is this KDIR, which on Guix
_could_ be found at
/gnu/store/…-linux-libre-5.0.1/lib/modules/5.0.1/build
Sadly, for us it's a dangling link to
/tmp/guix-build-linux-libre-5.0.1.drv-0/linux-5.0.1.
I presume that the answer is simple: replace the link with the folder.
But that would eat up significantly more disk space. So we could
replace the link with a link to a new "build" output of the linux-libre
package, which would contain this "build" folder.
Thoughts?
--
Pierre Neidhardt
https://ambrevar.xyz/
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