clang

.github/build-nest-v3

@@ -1 +1 @@
-2
+1

patches/0001-dkms-clang.patch

@@ -0,0 +1,50 @@
+From 1e5a4a3f9c67c5abea53df6881192c8c5f43765c Mon Sep 17 00:00:00 2001
+From: Eric Naim <dnaim@cachyos.org>
+Date: Sat, 21 Sep 2024 23:46:05 +0800
+Subject: [PATCH] Remove some Werror CFLAGS to increase compatibility with some
+ DKMS modules in clang-built kernels
+
+Signed-off-by: Eric Naim <dnaim@cachyos.org>
+---
+ scripts/Makefile.clang     | 2 --
+ scripts/Makefile.extrawarn | 4 ----
+ 2 files changed, 6 deletions(-)
+
+diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang
+index 6c23c6af797f..59b2e19416af 100644
+--- a/scripts/Makefile.clang
++++ b/scripts/Makefile.clang
+@@ -31,9 +31,7 @@ endif
+ # certain optimization flags it knows it has not implemented.
+ # Make it behave more like gcc by erroring when these flags are encountered
+ # so they can be implemented or wrapped in cc-option.
+-CLANG_FLAGS	+= -Werror=unknown-warning-option
+ CLANG_FLAGS	+= -Werror=ignored-optimization-argument
+ CLANG_FLAGS	+= -Werror=option-ignored
+-CLANG_FLAGS	+= -Werror=unused-command-line-argument
+ KBUILD_CPPFLAGS	+= $(CLANG_FLAGS)
+ export CLANG_FLAGS
+diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
+index 1d13cecc7cc7..ec97275c8852 100644
+--- a/scripts/Makefile.extrawarn
++++ b/scripts/Makefile.extrawarn
+@@ -12,7 +12,6 @@ KBUILD_CFLAGS += -Wundef
+ KBUILD_CFLAGS += -Werror=implicit-function-declaration
+ KBUILD_CFLAGS += -Werror=implicit-int
+ KBUILD_CFLAGS += -Werror=return-type
+-KBUILD_CFLAGS += -Werror=strict-prototypes
+ KBUILD_CFLAGS += -Wno-format-security
+ KBUILD_CFLAGS += -Wno-trigraphs
+ KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
+@@ -68,9 +67,6 @@ KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
+ # Prohibit date/time macros, which would make the build non-deterministic
+ KBUILD_CFLAGS += -Werror=date-time
+ 
+-# enforce correct pointer usage
+-KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
+-
+ # Require designated initializers for all marked structures
+ KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
+ 
+-- 
+2.46.1

patches/series

@@ -1,4 +1,5 @@
 0001-cachyos-base-all.patch
+0001-dkms-clang.patch
 0002-bore-cachy.patch
 0003-lazy.patch
 0004-zerofanstop1.patch

scripts/build.sh

@@ -2,4 +2,4 @@
 
 echo "Pika Kernel - Building"
 
-make -j`nproc` bindeb-pkg LOCALVERSION=-pikaos KDEB_PKGVERSION=$(make kernelversion)-101pika1
+make CC=clang LD=ld.lld LLVM=1 LLVM_IAS=1 -j`nproc` bindeb-pkg LOCALVERSION=-pikaos KDEB_PKGVERSION=$(make kernelversion)-101pika1

scripts/config.sh

@@ -9,10 +9,11 @@ scripts/config -k -e CONFIG_GENERIC_CPU3
 scripts/config -e CACHY
 scripts/config -e SCHED_BORE
 
+scripts/config -e LTO -e LTO_CLANG -e ARCH_SUPPORTS_LTO_CLANG -e ARCH_SUPPORTS_LTO_CLANG_THIN -e HAS_LTO_CLANG -e LTO_CLANG_THIN -d LTO_NONE -e HAVE_GCC_PLUGINS
+
 scripts/config -e HZ_1000 --set-val HZ 1000
 scripts/config -d HZ_PERIODIC -d NO_HZ_IDLE -d CONTEXT_TRACKING_FORCE -e NO_HZ_FULL_NODEF -e NO_HZ_FULL -e NO_HZ -e NO_HZ_COMMON -e CONTEXT_TRACKING
 scripts/config -e PREEMPT_BUILD -d PREEMPT_NONE -d PREEMPT_VOLUNTARY -e PREEMPT -e PREEMPT_COUNT -e PREEMPTION -e PREEMPT_DYNAMIC
-
 scripts/config -d CC_OPTIMIZE_FOR_PERFORMANCE \
             -e CC_OPTIMIZE_FOR_PERFORMANCE_O3