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124 lines
4.7 KiB
124 lines
4.7 KiB
# Copyright (C) 2018 The LineageOS Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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#
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# Kernel build configuration variables
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# ====================================
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#
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# These config vars are usually set in BoardConfig.mk:
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#
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# TARGET_KERNEL_SOURCE = Kernel source dir, optional, defaults
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# to kernel/$(TARGET_DEVICE_DIR)
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# TARGET_KERNEL_ARCH = Kernel Arch
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# TARGET_KERNEL_CROSS_COMPILE_PREFIX = Compiler prefix (e.g. arm-eabi-)
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# defaults to arm-linux-androidkernel- for arm
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# aarch64-linux-androidkernel- for arm64
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# x86_64-linux-androidkernel- for x86
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#
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# TARGET_KERNEL_CLANG_COMPILE = Compile kernel with clang, defaults to false
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#
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# KERNEL_TOOLCHAIN_PREFIX = Overrides TARGET_KERNEL_CROSS_COMPILE_PREFIX,
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# Set this var in shell to override
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# toolchain specified in BoardConfig.mk
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# KERNEL_TOOLCHAIN = Path to toolchain, if unset, assumes
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# TARGET_KERNEL_CROSS_COMPILE_PREFIX
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# is in PATH
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# USE_CCACHE = Enable ccache (global Android flag)
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BUILD_TOP := $(shell pwd)
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TARGET_AUTO_KDIR := $(shell echo $(TARGET_DEVICE_DIR) | sed -e 's/^device/kernel/g')
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TARGET_KERNEL_SOURCE ?= $(TARGET_AUTO_KDIR)
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ifneq ($(TARGET_PREBUILT_KERNEL),)
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TARGET_KERNEL_SOURCE :=
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endif
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TARGET_KERNEL_ARCH := $(strip $(TARGET_KERNEL_ARCH))
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ifeq ($(TARGET_KERNEL_ARCH),)
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KERNEL_ARCH := $(TARGET_ARCH)
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else
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KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
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endif
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TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX))
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ifneq ($(TARGET_KERNEL_CROSS_COMPILE_PREFIX),)
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KERNEL_TOOLCHAIN_PREFIX ?= $(TARGET_KERNEL_CROSS_COMPILE_PREFIX)
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else ifeq ($(KERNEL_ARCH),arm64)
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ifeq ($(TARGET_KERNEL_CLANG_COMPILE),true)
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KERNEL_TOOLCHAIN_PREFIX ?= aarch64-linux-android-
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else
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KERNEL_TOOLCHAIN_PREFIX ?= aarch64-linux-androidkernel-
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endif
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else ifeq ($(KERNEL_ARCH),arm)
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KERNEL_TOOLCHAIN_PREFIX ?= arm-linux-androidkernel-
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else ifeq ($(KERNEL_ARCH),x86)
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KERNEL_TOOLCHAIN_PREFIX ?= x86_64-linux-androidkernel-
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endif
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ifeq ($(KERNEL_TOOLCHAIN),)
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KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN_PREFIX)
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else ifneq ($(KERNEL_TOOLCHAIN_PREFIX),)
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KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN)/$(KERNEL_TOOLCHAIN_PREFIX)
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endif
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ifneq ($(USE_CCACHE),)
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# Detect if the system already has ccache installed to use instead of the prebuilt
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CCACHE_BIN := $(shell which ccache)
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ifeq ($(CCACHE_BIN),)
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CCACHE_BIN := $(BUILD_TOP)/prebuilts/misc/$(HOST_PREBUILT_TAG)/ccache/ccache
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# Check that the executable is here.
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CCACHE_BIN := $(strip $(wildcard $(CCACHE_BIN)))
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endif
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endif
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ifeq ($(TARGET_KERNEL_CLANG_COMPILE),true)
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KERNEL_CROSS_COMPILE := CROSS_COMPILE="$(KERNEL_TOOLCHAIN_PATH)"
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else
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KERNEL_CROSS_COMPILE := CROSS_COMPILE="$(CCACHE_BIN) $(KERNEL_TOOLCHAIN_PATH)"
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endif
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# Needed for CONFIG_COMPAT_VDSO, safe to set for all arm64 builds
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ifeq ($(KERNEL_ARCH),arm64)
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KERNEL_CROSS_COMPILE += CROSS_COMPILE_ARM32="arm-linux-androideabi-"
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endif
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# Clear this first to prevent accidental poisoning from env
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KERNEL_MAKE_FLAGS :=
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# Add back threads, ninja cuts this to $(nproc)/2
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KERNEL_MAKE_FLAGS += -j$$(nproc)
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ifeq ($(KERNEL_ARCH),arm)
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# Avoid "Unknown symbol _GLOBAL_OFFSET_TABLE_" errors
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KERNEL_MAKE_FLAGS += CFLAGS_MODULE="-fno-pic"
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endif
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ifeq ($(KERNEL_ARCH),arm64)
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# Avoid "unsupported RELA relocation: 311" errors (R_AARCH64_ADR_GOT_PAGE)
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KERNEL_MAKE_FLAGS += CFLAGS_MODULE="-fno-pic"
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endif
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ifeq ($(HOST_OS),darwin)
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KERNEL_MAKE_FLAGS += C_INCLUDE_PATH=$(BUILD_TOP)/external/elfutils/libelf:/usr/local/opt/openssl/include
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KERNEL_MAKE_FLAGS += LIBRARY_PATH=/usr/local/opt/openssl/lib
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endif
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# Set DTBO image locations so the build system knows to build them
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ifeq ($(TARGET_NEEDS_DTBOIMAGE),true)
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BOARD_PREBUILT_DTBOIMAGE ?= $(PRODUCT_OUT)/dtbo/arch/$(KERNEL_ARCH)/boot/dtbo.img
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else ifeq ($(BOARD_KERNEL_SEPARATED_DTBO),true)
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BOARD_PREBUILT_DTBOIMAGE ?= $(PRODUCT_OUT)/dtbo-pre.img
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endif
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