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kernel: Allow devices to opt-in for full LLVM build

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android11-5.4 kernel can fully compile with LLVM with a few cherrypicks
from android12-5.4 and android12-5.10

Change-Id: Ib71935d284ad78f1c23d039c15bfc5e0314a19eb
This commit is contained in:
Michael Bestas
2022-11-14 13:09:00 +02:00
parent d944f6d0fb
commit 41abb0b970
2 changed files with 15 additions and 8 deletions
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9
build/tasks/kernel.mk
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@@ -227,7 +227,7 @@ ifeq ($(or $(FULL_RECOVERY_KERNEL_BUILD), $(FULL_KERNEL_BUILD)),true)
# Add host bin out dir to path
PATH_OVERRIDE := PATH=$(KERNEL_BUILD_OUT_PREFIX)$(HOST_OUT_EXECUTABLES):$$PATH
ifneq ($(TARGET_KERNEL_CLANG_COMPILE),false)
ifeq (,$(filter 5.10, $(TARGET_KERNEL_VERSION)))
ifneq ($(KERNEL_NO_GCC), true)
ifeq ($(KERNEL_ARCH),arm64)
KERNEL_CLANG_TRIPLE ?= CLANG_TRIPLE=aarch64-linux-gnu-
else ifeq ($(KERNEL_ARCH),arm)
@@ -243,11 +243,8 @@ ifneq ($(TARGET_KERNEL_CLANG_COMPILE),false)
endif
endif
ifeq ($(TARGET_KERNEL_LLVM_BINUTILS), false)
# 5.10+ can fully compile without gcc
ifeq (,$(filter 5.10, $(TARGET_KERNEL_VERSION)))
PATH_OVERRIDE += PATH=$(KERNEL_TOOLCHAIN_PATH_gcc):$$PATH
endif
ifneq ($(KERNEL_NO_GCC), true)
PATH_OVERRIDE += PATH=$(KERNEL_TOOLCHAIN_PATH_gcc):$$PATH
endif
# System tools are no longer allowed on 10+

14
config/BoardConfigKernel.mk
View File

@@ -31,6 +31,8 @@
# TARGET_KERNEL_CLANG_PATH = Clang prebuilts path, optional
#
# TARGET_KERNEL_LLVM_BINUTILS = Use LLVM binutils, defaults to true
# TARGET_KERNEL_NO_GCC = Fully compile the kernel without GCC.
# Defaults to false
# TARGET_KERNEL_VERSION = Reported kernel version in top level kernel
# makefile. Can be overriden in device trees
# in the event of prebuilt kernel.
@@ -71,6 +73,15 @@ KERNEL_VERSION := $(shell grep -s "^VERSION = " $(TARGET_KERNEL_SOURCE)/Makefile
KERNEL_PATCHLEVEL := $(shell grep -s "^PATCHLEVEL = " $(TARGET_KERNEL_SOURCE)/Makefile | awk '{ print $$3 }')
TARGET_KERNEL_VERSION ?= $(shell echo $(KERNEL_VERSION)"."$(KERNEL_PATCHLEVEL))
# 5.10+ can fully compile without GCC by default
ifneq (,$(filter 5.10, $(TARGET_KERNEL_VERSION)))
TARGET_KERNEL_NO_GCC ?= true
endif
ifeq ($(TARGET_KERNEL_NO_GCC), true)
KERNEL_NO_GCC := true
endif
ifneq ($(TARGET_KERNEL_CLANG_VERSION),)
KERNEL_CLANG_VERSION := clang-$(TARGET_KERNEL_CLANG_VERSION)
else
@@ -95,8 +106,7 @@ KERNEL_MAKE_FLAGS += -j$(shell getconf _NPROCESSORS_ONLN)
TOOLS_PATH_OVERRIDE := \
PERL5LIB=$(BUILD_TOP)/prebuilts/tools-lineage/common/perl-base
# 5.10+ can fully compile without gcc
ifeq (,$(filter 5.10, $(TARGET_KERNEL_VERSION)))
ifneq ($(KERNEL_NO_GCC), true)
GCC_PREBUILTS := $(BUILD_TOP)/prebuilts/gcc/$(HOST_PREBUILT_TAG)
# arm64 toolchain
KERNEL_TOOLCHAIN_arm64 := $(GCC_PREBUILTS)/aarch64/aarch64-linux-android-4.9/bin