Comments (3)
danudey
commented on August 10, 2024
In order to successfully compile a kernel module via DKMS, you need to provide the module build with the same LLVM-related environment variables you used to build the kernel, and as far as I can tell this doesn't happen with DKMS (i.e. there's no way for DKMS to know what those parameters were).
On Ubuntu I had to modify the dkms file in /usr/src/nvidia-<ver>/dkms.conf to add those parameters; for example, to go from this:
MAKE[0]="'make' -j__JOBS NV_EXCLUDE_BUILD_MODULES='__EXCLUDE_MODULES' KERNEL_UNAME=${kernelver} modules"
to this:
MAKE[0]="LLVM=1 'make' -j__JOBS NV_EXCLUDE_BUILD_MODULES='__EXCLUDE_MODULES' KERNEL_UNAME=${kernelver} modules"
I would assume that on Arch you would have to do a similar thing.
(Ubuntu actually uses a different dkms.conf file which needs more work to fix.)
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ltsdw
commented on August 10, 2024
While setting the envar on the dkms.conf file would work, I have other kernels which weren't compiled using clang.
Like, the dkms script can detect where you compiled your kernel using clang or not:
# Check if clang was used to compile or lld was used to link the kernel.
if [[ -e $kernel_source_dir/vmlinux ]]; then
if readelf -p .comment $kernel_source_dir/vmlinux | grep -q clang; then
make_command="${make_command} CC=clang"
fi
if readelf -p .comment $kernel_source_dir/vmlinux | grep -q LLD; then
make_command="${make_command} LD=ld.lld"
fi
elif [[ -e "${kernel_config}" ]]; then
if grep -q CONFIG_CC_IS_CLANG=y "${kernel_config}"; then
make_command="${make_command} CC=clang"
fi
if grep -q CONFIG_LD_IS_LLD=y "${kernel_config}"; then
make_command="${make_command} LD=ld.lld"
fi
fiAs such without ThinLTO I don't even have to worry about setting envars for clang ou llvm-strip, it compiles normally.
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ltsdw
commented on August 10, 2024
This one works for me, although some of the envars may not be needed.
--- a/dkms 2024-05-18 11:52:29.624897615 -0300
+++ b/dkms 2024-05-18 11:52:17.387875553 -0300
@@ -589,17 +589,17 @@
# Check if clang was used to compile or lld was used to link the kernel.
if [[ -e $kernel_source_dir/vmlinux ]]; then
if readelf -p .comment $kernel_source_dir/vmlinux | grep -q clang; then
- make_command="${make_command} CC=clang"
+ make_command="${make_command} CC=clang CXX=clang++ AR=llvm-ar OBJCOPY=llvm-objcopy"
fi
if readelf -p .comment $kernel_source_dir/vmlinux | grep -q LLD; then
- make_command="${make_command} LD=ld.lld"
+ make_command="${make_command} LD=ld.lld AR=llvm-ar OBJCOPY=llvm-objcopy"
fi
elif [[ -e "${kernel_config}" ]]; then
if grep -q CONFIG_CC_IS_CLANG=y "${kernel_config}"; then
- make_command="${make_command} CC=clang"
+ make_command="${make_command} CC=clang CXX=clang++ AR=llvm-ar OBJCOPY=llvm-objcopy"
fi
if grep -q CONFIG_LD_IS_LLD=y "${kernel_config}"; then
- make_command="${make_command} LD=ld.lld"
+ make_command="${make_command} LD=ld.lld AR=llvm-ar OBJCOPY=llvm-objcopy"
fi
fi
@@ -1112,7 +1112,11 @@
local built_module="$the_module$module_uncompressed_suffix"
local compressed_module="$the_module$module_suffix"
- [[ ${strip[$count]} != no ]] && strip -g "$built_module"
+ if [[ ${strip[$count]} != no ]] && [[ ${CC} == "clang" ]]; then
+ llvm-strip -g "$built_module"
+ elif [[ ${strip[$count]} != no ]]; then
+ strip -g "$built_module"
+ fi
if (( do_signing )); then
echo "Signing module $built_module"from dkms.
Related Issues (20)
- document creation of missing signing key/certificate
- common.postinst and AUTOINSTALL="" HOT 6
- adding a BUILD_EXCLUSIVE_KERNEL... blacklist? HOT 3
- command to (re)sign currently installed modules
- Warnings since dkms-3.0.10 on Arch system HOT 9
- dkms built modules may be compressed in a way unsupported by the kernel HOT 4
- Kernel match for BUILT_MODULE_NAME HOT 9
- Introduce a `build $module for all kernels` functionality HOT 1
- Reintroduce support for `dkms add/build/install m/v --all` HOT 1
- A typo in the readme file
- Ubuntu 22.04 VM broke HOT 6
- marking built/installed modules as rebuild-needed
- parameter validation
- 3.0.13 release isn't tagged as latest on GitHub HOT 1
- OBSOLETE_BY does not prevent building HOT 1
- Retrospective from the recent XZ vuln HOT 1
- DOS-style line endings in dkms.conf break dkms in unpredictable ways HOT 1
- Stop handling dkms.conf as a bash/shell script HOT 8
- Leftover files after zfs build HOT 2
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