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feat: build kernel with Clang #1390

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f1a50eb
feat: build kernel with Clang
dsseng Dec 1, 2025
1a848dc
DROP: ttl.sh
dsseng Dec 1, 2025
61980ad
thinlto
dsseng Dec 8, 2025
21ca766
nvidia lto fix
dsseng Dec 8, 2025
6fd48ec
fix drivers
dsseng Dec 13, 2025
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10 changes: 10 additions & 0 deletions .github/workflows/ci.yaml
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Expand Up @@ -85,6 +85,16 @@ jobs:
password: ${{ secrets.GITHUB_TOKEN }}
registry: ghcr.io
username: ${{ github.repository_owner }}
- name: Push to ttl.sh
if: github.event_name == 'pull_request'
run: |
make PUSH=true REGISTRY=ttl.sh PROGRESS=plain
continue-on-error: true
- name: Push nonfree to ttl.sh
if: github.event_name == 'pull_request'
run: |
make nonfree PUSH=true REGISTRY=ttl.sh PROGRESS=plain
continue-on-error: true
- name: Push to registry
if: github.event_name != 'pull_request'
run: |
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2 changes: 1 addition & 1 deletion .kres.yaml
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Expand Up @@ -114,7 +114,7 @@ spec:
for platform in $(shell echo $(PLATFORM) | tr "," " "); do \
arch=`basename $$platform` ; \
$(MAKE) docker-kernel-prepare PLATFORM=$$platform BUILDKIT_MULTI_PLATFORM=0 TARGET_ARGS="--tag=$(REGISTRY)/$(USERNAME)/kernel:$(TAG)-$$arch --load"; \
docker run --rm -it --entrypoint=/bin/bash -w /src -v $$PWD/kernel/build/config-$$arch:/host/.hostconfig $(REGISTRY)/$(USERNAME)/kernel:$(TAG)-$$arch -c 'cp /host/.hostconfig .config && make $* && cp .config /host/.hostconfig'; \
docker run --rm -it --entrypoint=/bin/bash -w /src -v $$PWD/kernel/build/config-$$arch:/host/.hostconfig $(REGISTRY)/$(USERNAME)/kernel:$(TAG)-$$arch -c 'cp /host/.hostconfig .config && make LLVM=1 $* && cp .config /host/.hostconfig'; \
done
---
kind: custom.Step
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4 changes: 2 additions & 2 deletions Makefile
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@@ -1,6 +1,6 @@
# THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
#
# Generated on 2026-01-23T13:35:39Z by kres 1ffefb6.
# Generated on 2026-01-24T21:13:19Z by kres 1ffefb6.

# common variables

Expand Down Expand Up @@ -230,7 +230,7 @@ kernel-%:
for platform in $(shell echo $(PLATFORM) | tr "," " "); do \
arch=`basename $$platform` ; \
$(MAKE) docker-kernel-prepare PLATFORM=$$platform BUILDKIT_MULTI_PLATFORM=0 TARGET_ARGS="--tag=$(REGISTRY)/$(USERNAME)/kernel:$(TAG)-$$arch --load"; \
docker run --rm -it --entrypoint=/bin/bash -w /src -v $$PWD/kernel/build/config-$$arch:/host/.hostconfig $(REGISTRY)/$(USERNAME)/kernel:$(TAG)-$$arch -c 'cp /host/.hostconfig .config && make $* && cp .config /host/.hostconfig'; \
docker run --rm -it --entrypoint=/bin/bash -w /src -v $$PWD/kernel/build/config-$$arch:/host/.hostconfig $(REGISTRY)/$(USERNAME)/kernel:$(TAG)-$$arch -c 'cp /host/.hostconfig .config && make LLVM=1 $* && cp .config /host/.hostconfig'; \
done

.PHONY: check-dirty
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1 change: 1 addition & 0 deletions Pkgfile
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Expand Up @@ -6,6 +6,7 @@ vars:
TOOLCHAIN_MUSL_IMAGE: ghcr.io/siderolabs/toolchain-musl:v1.13.0-alpha.0-3-g3a527b1
TOOLS_PREFIX: ghcr.io/siderolabs/
TOOLS_REV: v1.13.0-alpha.0-10-g721ad07
LLVM: ghcr.io/dsseng/tools-llvm:v1.13.0-alpha.0-21-g784a7a3

# renovate: datasource=github-releases depName=containernetworking/plugins
cni_version: v1.9.0
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5 changes: 3 additions & 2 deletions drbd/pkg.yaml
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Expand Up @@ -4,6 +4,7 @@ shell: /bin/bash
dependencies:
- stage: base
- stage: kernel-build
- image: "{{ .LLVM }}"
steps:
- sources:
- url: https://pkg.linbit.com//downloads/drbd/{{ regexReplaceAll ".\\d+\\.\\d+$" .drbd_version "${1}" }}/drbd-{{ .drbd_version }}.tar.gz
Expand All @@ -18,7 +19,7 @@ steps:
- network: default
build:
- |
make -j $(nproc) -C drbd KERNEL_SOURCES=/src MODVERSIONS=detect KDIR=/src
make LLVM=1 -j $(nproc) -C drbd KERNEL_SOURCES=/src MODVERSIONS=detect KDIR=/src
- network: none
install:
- |
Expand All @@ -27,7 +28,7 @@ steps:
cp /src/modules.builtin /rootfs/usr/lib/modules/$(cat /src/include/config/kernel.release)/
cp /src/modules.builtin.modinfo /rootfs/usr/lib/modules/$(cat /src/include/config/kernel.release)/

make -C /src M=$(pwd)/drbd/build-current modules_install DESTDIR=/rootfs INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=extras INSTALL_MOD_STRIP=1 CONFIG_MODULE_SIG_ALL=y
make LLVM=1 -C /src M=$(pwd)/drbd/build-current modules_install DESTDIR=/rootfs INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=extras INSTALL_MOD_STRIP=1 CONFIG_MODULE_SIG_ALL=y
test:
- |
# https://www.kernel.org/doc/html/v4.15/admin-guide/module-signing.html#signed-modules-and-stripping
Expand Down
5 changes: 3 additions & 2 deletions ena-pkg/pkg.yaml
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Expand Up @@ -4,6 +4,7 @@ shell: /bin/bash
dependencies:
- stage: base
- stage: kernel-build
- image: "{{ .LLVM }}"
steps:
- sources:
- url: https://github.com/amzn/amzn-drivers/archive/refs/tags/ena_linux_{{ .ena_version }}.tar.gz
Expand All @@ -18,14 +19,14 @@ steps:
build:
- |
cd kernel/linux/ena
make KERNEL_BUILD_DIR=/src
make LLVM=1 KERNEL_BUILD_DIR=/src

install:
- |
cd kernel/linux/ena
mkdir -p /rootfs/usr/lib/modules/$(cat /src/include/config/kernel.release)

make -C /src M=$(pwd) modules_install INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=extras INSTALL_MOD_STRIP=1
make LLVM=1 -C /src M=$(pwd) modules_install INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=extras INSTALL_MOD_STRIP=1
test:
- |
# https://www.kernel.org/doc/html/v4.15/admin-guide/module-signing.html#signed-modules-and-stripping
Expand Down
5 changes: 3 additions & 2 deletions gasket-driver/pkg.yaml
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Expand Up @@ -4,6 +4,7 @@ shell: /bin/bash
dependencies:
- stage: base
- stage: kernel-build
- image: "{{ .LLVM }}"
steps:
- sources:
- url: https://github.com/google/gasket-driver/archive/{{ .gasket_driver_ref }}.tar.gz
Expand All @@ -24,7 +25,7 @@ steps:
- |
cd src
sed -i 's|/lib/modules/$(KVERSION)/build|/src|' ./Makefile
make all
make LLVM=1 all

install:
- |
Expand All @@ -33,7 +34,7 @@ steps:
cp /src/modules.builtin /rootfs/usr/lib/modules/$(cat /src/include/config/kernel.release)/
cp /src/modules.builtin.modinfo /rootfs/usr/lib/modules/$(cat /src/include/config/kernel.release)/

make -C /src M=$(pwd)/src modules_install INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=extras INSTALL_MOD_STRIP=1
make LLVM=1 -C /src M=$(pwd)/src modules_install INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=extras INSTALL_MOD_STRIP=1
test:
- |
# https://www.kernel.org/doc/html/v4.15/admin-guide/module-signing.html#signed-modules-and-stripping
Expand Down
5 changes: 3 additions & 2 deletions hailort/pkg.yaml
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Expand Up @@ -4,6 +4,7 @@ shell: /bin/bash
dependencies:
- stage: base
- stage: kernel-build
- image: "{{ .LLVM }}"
steps:
- sources:
- url: https://github.com/hailo-ai/hailort-drivers/archive/refs/tags/v{{ .hailort_version }}.tar.gz
Expand All @@ -25,12 +26,12 @@ steps:
build:
- |
cd linux/pcie
make -j $(nproc) KERNEL_DIR=/src/ all
make LLVM=1 -j $(nproc) KERNEL_DIR=/src/ all
install:
- |
mv hailo8_fw.bin /rootfs/usr/lib/firmware/hailo/hailo8_fw.bin
cd linux/pcie
make -j $(nproc) -C /src M=$(pwd) modules_install INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=kernel/drivers/misc INSTALL_MOD_STRIP=1
make LLVM=1 -j $(nproc) -C /src M=$(pwd) modules_install INSTALL_MOD_PATH=/rootfs/usr INSTALL_MOD_DIR=kernel/drivers/misc INSTALL_MOD_STRIP=1
cp 51-hailo-udev.rules /rootfs/usr/lib/udev/rules.d/51-hailo-udev.rules
test:
- |
Expand Down
59 changes: 29 additions & 30 deletions kernel/build/config-amd64
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Expand Up @@ -2,18 +2,17 @@
# Automatically generated file; DO NOT EDIT.
# Linux/x86 6.18.6 Kernel Configuration
#
CONFIG_CC_VERSION_TEXT="gcc (GCC) 15.2.0"
CONFIG_CC_IS_GCC=y
CONFIG_GCC_VERSION=150200
CONFIG_CLANG_VERSION=0
CONFIG_AS_IS_GNU=y
CONFIG_AS_VERSION=24501
CONFIG_LD_IS_BFD=y
CONFIG_LD_VERSION=24501
CONFIG_LLD_VERSION=0
CONFIG_CC_VERSION_TEXT="clang version 21.1.8"
CONFIG_GCC_VERSION=0
CONFIG_CC_IS_CLANG=y
CONFIG_CLANG_VERSION=210108
CONFIG_AS_IS_LLVM=y
CONFIG_AS_VERSION=210108
CONFIG_LD_VERSION=0
CONFIG_LD_IS_LLD=y
CONFIG_LLD_VERSION=210108
CONFIG_RUSTC_VERSION=0
CONFIG_RUSTC_LLVM_VERSION=0
CONFIG_CC_CAN_LINK=y
CONFIG_CC_HAS_ASM_GOTO_OUTPUT=y
CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT=y
CONFIG_TOOLS_SUPPORT_RELR=y
Expand Down Expand Up @@ -187,11 +186,9 @@ CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y
CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH=y
CONFIG_CC_HAS_INT128=y
CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough=5"
CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough"
CONFIG_GCC10_NO_ARRAY_BOUNDS=y
CONFIG_CC_NO_ARRAY_BOUNDS=y
CONFIG_GCC_NO_STRINGOP_OVERFLOW=y
CONFIG_CC_NO_STRINGOP_OVERFLOW=y
CONFIG_ARCH_SUPPORTS_INT128=y
# CONFIG_NUMA_BALANCING is not set
CONFIG_SLAB_OBJ_EXT=y
Expand Down Expand Up @@ -528,12 +525,11 @@ CONFIG_HAVE_LIVEPATCH=y
CONFIG_X86_BUS_LOCK_DETECT=y
# end of Processor type and features

CONFIG_CC_HAS_NAMED_AS=y
CONFIG_CC_HAS_NAMED_AS_FIXED_SANITIZERS=y
CONFIG_USE_X86_SEG_SUPPORT=y
CONFIG_CC_HAS_SLS=y
CONFIG_CC_HAS_RETURN_THUNK=y
CONFIG_CC_HAS_ENTRY_PADDING=y
CONFIG_CC_HAS_KCFI_ARITY=y
CONFIG_FUNCTION_PADDING_CFI=11
CONFIG_FUNCTION_PADDING_BYTES=16
CONFIG_CALL_PADDING=y
Expand Down Expand Up @@ -729,7 +725,6 @@ CONFIG_AMD_NODE=y
#
CONFIG_IA32_EMULATION=y
# CONFIG_IA32_EMULATION_DEFAULT_DISABLED is not set
# CONFIG_X86_X32_ABI is not set
CONFIG_COMPAT_32=y
CONFIG_COMPAT=y
CONFIG_COMPAT_FOR_U64_ALIGNMENT=y
Expand Down Expand Up @@ -889,12 +884,21 @@ CONFIG_HAVE_ARCH_KSTACK_ERASE=y
CONFIG_HAVE_STACKPROTECTOR=y
CONFIG_STACKPROTECTOR=y
CONFIG_STACKPROTECTOR_STRONG=y
CONFIG_LTO=y
CONFIG_LTO_CLANG=y
CONFIG_ARCH_SUPPORTS_LTO_CLANG=y
CONFIG_ARCH_SUPPORTS_LTO_CLANG_THIN=y
CONFIG_LTO_NONE=y
CONFIG_HAS_LTO_CLANG=y
# CONFIG_LTO_NONE is not set
# CONFIG_LTO_CLANG_FULL is not set
CONFIG_LTO_CLANG_THIN=y
CONFIG_ARCH_SUPPORTS_AUTOFDO_CLANG=y
# CONFIG_AUTOFDO_CLANG is not set
CONFIG_ARCH_SUPPORTS_PROPELLER_CLANG=y
# CONFIG_PROPELLER_CLANG is not set
CONFIG_ARCH_SUPPORTS_CFI=y
# CONFIG_CFI is not set
CONFIG_HAVE_CFI_ICALL_NORMALIZE_INTEGERS=y
CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES=y
CONFIG_HAVE_CONTEXT_TRACKING_USER=y
CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK=y
Expand Down Expand Up @@ -976,12 +980,9 @@ CONFIG_ARCH_HAS_GCOV_PROFILE_ALL=y
# end of GCOV-based kernel profiling

CONFIG_HAVE_GCC_PLUGINS=y
CONFIG_GCC_PLUGINS=y
CONFIG_GCC_PLUGIN_LATENT_ENTROPY=y
CONFIG_FUNCTION_ALIGNMENT_4B=y
CONFIG_FUNCTION_ALIGNMENT_16B=y
CONFIG_FUNCTION_ALIGNMENT=16
CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT=y
CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT=y
CONFIG_ARCH_HAS_CPU_ATTACK_VECTORS=y
# end of General architecture-dependent options
Expand All @@ -996,7 +997,6 @@ CONFIG_MODULE_UNLOAD=y
# CONFIG_MODULE_UNLOAD_TAINT_TRACKING is not set
CONFIG_MODVERSIONS=y
CONFIG_GENKSYMS=y
# CONFIG_GENDWARFKSYMS is not set
CONFIG_ASM_MODVERSIONS=y
# CONFIG_EXTENDED_MODVERSIONS is not set
CONFIG_BASIC_MODVERSIONS=y
Expand Down Expand Up @@ -6939,9 +6939,8 @@ CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO=y
# CONFIG_INIT_STACK_NONE is not set
# CONFIG_INIT_STACK_ALL_PATTERN is not set
CONFIG_INIT_STACK_ALL_ZERO=y
CONFIG_CC_HAS_SANCOV_STACK_DEPTH_CALLBACK=y
CONFIG_KSTACK_ERASE=y
CONFIG_GCC_PLUGIN_STACKLEAK=y
# CONFIG_GCC_PLUGIN_STACKLEAK_VERBOSE is not set
CONFIG_KSTACK_ERASE_TRACK_MIN_SIZE=100
# CONFIG_KSTACK_ERASE_METRICS is not set
# CONFIG_KSTACK_ERASE_RUNTIME_DISABLE is not set
Expand All @@ -6966,9 +6965,9 @@ CONFIG_LIST_HARDENED=y
CONFIG_BUG_ON_DATA_CORRUPTION=y
# end of Hardening of kernel data structures

CONFIG_CC_HAS_RANDSTRUCT=y
CONFIG_RANDSTRUCT_NONE=y
# CONFIG_RANDSTRUCT_FULL is not set
# CONFIG_RANDSTRUCT_PERFORMANCE is not set
# end of Kernel hardening options
# end of Security options

Expand Down Expand Up @@ -7426,15 +7425,14 @@ CONFIG_DEBUG_INFO_COMPRESSED_NONE=y
# CONFIG_DEBUG_INFO_SPLIT is not set
CONFIG_DEBUG_INFO_BTF=y
CONFIG_PAHOLE_HAS_SPLIT_BTF=y
CONFIG_PAHOLE_HAS_BTF_TAG=y
CONFIG_PAHOLE_HAS_LANG_EXCLUDE=y
CONFIG_DEBUG_INFO_BTF_MODULES=y
# CONFIG_MODULE_ALLOW_BTF_MISMATCH is not set
# CONFIG_GDB_SCRIPTS is not set
CONFIG_FRAME_WARN=2048
# CONFIG_STRIP_ASM_SYMS is not set
# CONFIG_READABLE_ASM is not set
# CONFIG_HEADERS_INSTALL is not set
# CONFIG_DEBUG_SECTION_MISMATCH is not set
CONFIG_SECTION_MISMATCH_WARN_ONLY=y
# CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B is not set
CONFIG_OBJTOOL=y
Expand All @@ -7459,11 +7457,10 @@ CONFIG_HAVE_ARCH_KGDB=y
CONFIG_ARCH_HAS_UBSAN=y
CONFIG_UBSAN=y
# CONFIG_UBSAN_TRAP is not set
CONFIG_CC_HAS_UBSAN_BOUNDS_STRICT=y
CONFIG_CC_HAS_UBSAN_ARRAY_BOUNDS=y
CONFIG_UBSAN_BOUNDS=y
CONFIG_UBSAN_BOUNDS_STRICT=y
CONFIG_UBSAN_ARRAY_BOUNDS=y
CONFIG_UBSAN_SHIFT=y
# CONFIG_UBSAN_DIV_ZERO is not set
CONFIG_UBSAN_BOOL=y
CONFIG_UBSAN_ENUM=y
# CONFIG_UBSAN_ALIGNMENT is not set
Expand Down Expand Up @@ -7530,6 +7527,8 @@ CONFIG_KFENCE_NUM_OBJECTS=255
# CONFIG_KFENCE_STATIC_KEYS is not set
CONFIG_KFENCE_STRESS_TEST_FAULTS=0
CONFIG_HAVE_ARCH_KMSAN=y
CONFIG_HAVE_KMSAN_COMPILER=y
# CONFIG_KMSAN is not set
# end of Memory Debugging

# CONFIG_DEBUG_SHIRQ is not set
Expand Down Expand Up @@ -7673,7 +7672,7 @@ CONFIG_BPF_EVENTS=y
CONFIG_DYNAMIC_EVENTS=y
CONFIG_PROBE_EVENTS=y
# CONFIG_BPF_KPROBE_OVERRIDE is not set
CONFIG_FTRACE_MCOUNT_USE_CC=y
CONFIG_FTRACE_MCOUNT_USE_OBJTOOL=y
# CONFIG_SYNTH_EVENTS is not set
# CONFIG_USER_EVENTS is not set
# CONFIG_HIST_TRIGGERS is not set
Expand Down
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