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WIP: Compat with clang-built kernel #458

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7ccbaf5
testsuite: Match kernel compiler for external modules
lucasdemarchi Aug 7, 2026
ada8348
testsuite: Workaround BTF failures
lucasdemarchi Aug 7, 2026
905572d
ci: Fix typo s/ldd/lld/
lucasdemarchi Aug 7, 2026
1df1722
ci: Plumb cachyos support
lucasdemarchi Aug 7, 2026
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23 changes: 23 additions & 0 deletions .github/actions/setup-os/setup-cachyos.sh
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
#!/bin/bash
# SPDX-FileCopyrightText: 2024 Emil Velikov <emil.l.velikov@gmail.com>
# SPDX-FileCopyrightText: 2024 Lucas De Marchi <lucas.de.marchi@gmail.com>
#
# SPDX-License-Identifier: LGPL-2.1-or-later

# Semi-regularly the packager key may have (temporarily) expired. Somewhat
# robust solution is to wipe the local keyring and regenerate/reinstall it
# prior to any other packages on the system.
rm -rf /etc/pacman.d/gnupg
pacman-key --init
pacman-key --populate
pacman --noconfirm -Sy archlinux-keyring

pacman --noconfirm -Su \
clang \
git \
gtk-doc \
linux-cachyos-headers \
lld \
mbedtls \
meson \
scdoc
9 changes: 8 additions & 1 deletion .github/workflows/main.yml
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Expand Up @@ -63,7 +63,14 @@ jobs:
- container: 'archlinux:multilib-devel'
only_bits: '64'
only_compiler: 'clang'
custom: 'ldd-as-linker'
custom: 'lld-as-linker'
linker: 'lld'

# Variant with kernel built with clang
- container: 'cachyos/cachyos:latest'
only_bits: '64'
only_compiler: 'clang'
custom: 'clang-kernel'
linker: 'lld'

# Variants with moduledir
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10 changes: 8 additions & 2 deletions testsuite/module-playground/Makefile
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Expand Up @@ -19,6 +19,12 @@ else ifeq ($(KDIR),any)
KDIR := $(shell find $(MODULE_DIRECTORY) -maxdepth 1 -mindepth 1 -type d | sort -V | tail -n1)/build
endif

KERNEL_MAKE_ARGS := M=$$PWD
ifeq ($(origin LLVM), undefined)
KERNEL_MAKE_ARGS += $(shell grep -qs "^CONFIG_CC_IS_CLANG=y" "$(KDIR)/include/config/auto.conf" && printf 'LLVM=1')
KERNEL_MAKE_ARGS += CONFIG_DEBUG_INFO_BTF_MODULES=
endif

ARCH_SPECIFIC_MODULES := mod-simple-x86_64.ko mod-simple-i386.ko mod-simple-sparc64.ko

default: modules
Expand All @@ -28,9 +34,9 @@ mod-simple-%.ko: mod-simple-%.c Makefile.arch
$(MAKE) KDIR=$(KDIR_$(arch)) ARCH=$(arch) CROSS_COMPILE=$(CROSS_COMPILE_$(arch)) -f Makefile.arch

modules:
$(MAKE) -C $(KDIR) M=$$PWD modules
$(MAKE) -C $(KDIR) $(KERNEL_MAKE_ARGS) modules

arch-modules: $(ARCH_SPECIFIC_MODULES)

clean:
$(MAKE) -C $(KDIR) M=$$PWD clean
$(MAKE) -C $(KDIR) $(KERNEL_MAKE_ARGS) clean
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