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# Copyright (C) 2018-2019 The LineageOS Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#
# Kernel build configuration variables
# ====================================
#
# These config vars are usually set in BoardConfig.mk:
#
# TARGET_KERNEL_SOURCE = Kernel source dir, optional, defaults
# to kernel/$(TARGET_DEVICE_DIR)
# TARGET_KERNEL_ADDITIONAL_FLAGS = Additional make flags, optional
# TARGET_KERNEL_ARCH = Kernel Arch
# TARGET_KERNEL_CROSS_COMPILE_PREFIX = Compiler prefix (e.g. arm-eabi-)
# defaults to arm-linux-androidkernel- for arm
# aarch64-linux-android- for arm64
# x86_64-linux-android- for x86
#
# TARGET_KERNEL_CLANG_COMPILE = Compile kernel with clang, defaults to false
#
# KERNEL_TOOLCHAIN_PREFIX = Overrides TARGET_KERNEL_CROSS_COMPILE_PREFIX,
# Set this var in shell to override
# toolchain specified in BoardConfig.mk
# KERNEL_TOOLCHAIN = Path to toolchain, if unset, assumes
# TARGET_KERNEL_CROSS_COMPILE_PREFIX
# is in PATH
# USE_CCACHE = Enable ccache (global Android flag)
BUILD_TOP := $(shell pwd)
TARGET_AUTO_KDIR := $(shell echo $(TARGET_DEVICE_DIR) | sed -e 's/^device/kernel/g')
TARGET_KERNEL_SOURCE ?= $(TARGET_AUTO_KDIR)
ifneq ($(TARGET_PREBUILT_KERNEL),)
TARGET_KERNEL_SOURCE :=
endif
TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))
ifeq ($(TARGET_KERNEL_ARCH),)
KERNEL_ARCH := $(TARGET_ARCH)
else
KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
endif
GCC_PREBUILTS := $(BUILD_TOP)/prebuilts/gcc/$(HOST_OS)-x86
# arm64 toolchain
KERNEL_TOOLCHAIN_arm64 := $(GCC_PREBUILTS)/aarch64/aarch64-linux-android-4.9/bin
KERNEL_TOOLCHAIN_PREFIX_arm64 := aarch64-linux-android-
# arm toolchain
KERNEL_TOOLCHAIN_arm := $(GCC_PREBUILTS)/arm/arm-linux-androideabi-4.9/bin
KERNEL_TOOLCHAIN_PREFIX_arm := arm-linux-androidkernel-
# x86 toolchain
KERNEL_TOOLCHAIN_x86 := $(GCC_PREBUILTS)/x86/x86_64-linux-android-4.9/bin
KERNEL_TOOLCHAIN_PREFIX_x86 := x86_64-linux-android-
TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX))
ifneq ($(TARGET_KERNEL_CROSS_COMPILE_PREFIX),)
KERNEL_TOOLCHAIN_PREFIX ?= $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)
else
KERNEL_TOOLCHAIN ?= $(KERNEL_TOOLCHAIN_$(KERNEL_ARCH))
KERNEL_TOOLCHAIN_PREFIX ?= $(KERNEL_TOOLCHAIN_PREFIX_$(KERNEL_ARCH))
endif
ifeq ($(KERNEL_TOOLCHAIN),)
KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN_PREFIX)
else
KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN)/$(KERNEL_TOOLCHAIN_PREFIX)
endif
# We need to add GCC toolchain to the path no matter what
# for tools like `as`
KERNEL_TOOLCHAIN_PATH_gcc := $(KERNEL_TOOLCHAIN_$(KERNEL_ARCH))/$(KERNEL_TOOLCHAIN_PREFIX_$(KERNEL_ARCH))
ifneq ($(USE_CCACHE),)
ifneq ($(CCACHE_EXEC),)
# Android 10+ deprecates use of a build ccache. Only system installed ones are now allowed
CCACHE_BIN := $(CCACHE_EXEC)
endif
endif
TARGET_KERNEL_CLANG_COMPILE := true
ifeq ($(TARGET_KERNEL_CLANG_COMPILE),true)
KERNEL_CROSS_COMPILE := CROSS_COMPILE="$(KERNEL_TOOLCHAIN_PATH)"
else
KERNEL_CROSS_COMPILE := CROSS_COMPILE="$(CCACHE_BIN) $(KERNEL_TOOLCHAIN_PATH)"
endif
# Needed for CONFIG_COMPAT_VDSO, safe to set for all arm64 builds
ifeq ($(KERNEL_ARCH),arm64)
KERNEL_CROSS_COMPILE += CROSS_COMPILE_ARM32="$(KERNEL_TOOLCHAIN_arm)/$(KERNEL_TOOLCHAIN_PREFIX_arm)"
endif
# Clear this first to prevent accidental poisoning from env
KERNEL_MAKE_FLAGS :=
# Add back threads, ninja cuts this to $(nproc)/2
KERNEL_MAKE_FLAGS += -j$(shell prebuilts/tools-lineage/$(HOST_PREBUILT_TAG)/bin/nproc --all)
ifeq ($(KERNEL_ARCH),arm)
# Avoid "Unknown symbol _GLOBAL_OFFSET_TABLE_" errors
KERNEL_MAKE_FLAGS += CFLAGS_MODULE="-fno-pic"
endif
ifeq ($(KERNEL_ARCH),arm64)
# Avoid "unsupported RELA relocation: 311" errors (R_AARCH64_ADR_GOT_PAGE)
KERNEL_MAKE_FLAGS += CFLAGS_MODULE="-fno-pic"
endif
ifeq ($(HOST_OS),darwin)
KERNEL_MAKE_FLAGS += HOSTCFLAGS="-I$(BUILD_TOP)/external/elfutils/libelf -I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib"
else
KERNEL_MAKE_FLAGS += CPATH="/usr/include:/usr/include/x86_64-linux-gnu" HOSTCFLAGS="-L/usr/lib/x86_64-linux-gnu -L/usr/lib64"
endif
ifneq ($(TARGET_KERNEL_ADDITIONAL_FLAGS),)
KERNEL_MAKE_FLAGS += $(TARGET_KERNEL_ADDITIONAL_FLAGS)
endif
TOOLS_PATH_OVERRIDE := \
PATH=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_OS)-x86/bin:$$PATH \
LD_LIBRARY_PATH=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_OS)-x86/lib:$$LD_LIBRARY_PATH \
PERL5LIB=$(BUILD_TOP)/prebuilts/tools-lineage/common/perl-base
# Set DTBO image locations so the build system knows to build them
ifeq (true,$(filter true, $(TARGET_NEEDS_DTBOIMAGE) $(BOARD_KERNEL_SEPARATED_DTBO)))
BOARD_PREBUILT_DTBOIMAGE ?= $(TARGET_OUT_INTERMEDIATES)/DTBO_OBJ/arch/$(KERNEL_ARCH)/boot/dtbo.img
endif
# Set use the full path to the make command
KERNEL_MAKE_CMD := $(BUILD_TOP)/prebuilts/build-tools/$(HOST_OS)-x86/bin/make
# Set the full path to the gcc command
ifeq ($(HOST_OS),darwin)
KERNEL_HOST_TOOLCHAIN_ROOT := $(GCC_PREBUILTS)/host/i686-apple-darwin-4.2.1/bin/i686-apple-darwin11-
else
KERNEL_HOST_TOOLCHAIN_ROOT := $(GCC_PREBUILTS)/host/x86_64-linux-glibc2.17-4.8/bin/x86_64-linux-
endif
KERNEL_MAKE_FLAGS += HOSTCC=$(KERNEL_HOST_TOOLCHAIN_ROOT)gcc
KERNEL_MAKE_FLAGS += HOSTCXX=$(KERNEL_HOST_TOOLCHAIN_ROOT)g++
# Since Linux 4.16, flex and bison are required
KERNEL_MAKE_FLAGS += LEX=$(BUILD_TOP)/prebuilts/build-tools/$(HOST_OS)-x86/bin/flex
KERNEL_MAKE_FLAGS += YACC=$(BUILD_TOP)/prebuilts/build-tools/$(HOST_OS)-x86/bin/bison
TOOLS_PATH_OVERRIDE += BISON_PKGDATADIR=$(BUILD_TOP)/prebuilts/build-tools/common/bison
# Set the out dir for the kernel's O= arg
# This needs to be an absolute path, so only set this if the standard out dir isn't used
OUT_DIR_PREFIX := $(shell echo $(OUT_DIR) | sed -e 's|/target/.*$$||g')
KERNEL_BUILD_OUT_PREFIX :=
ifeq ($(OUT_DIR_PREFIX),out)
KERNEL_BUILD_OUT_PREFIX := $(BUILD_TOP)/
endif