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157 lines
6.7 KiB
157 lines
6.7 KiB
# Copyright (C) 2018-2020 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_ADDITIONAL_FLAGS = Additional make flags, optional
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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-android- for arm64
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# x86_64-linux-android- 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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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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CLANG_PREBUILTS := $(BUILD_TOP)/prebuilts/clang/host/$(HOST_PREBUILT_TAG)/clang-r383902b
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GCC_PREBUILTS := $(BUILD_TOP)/prebuilts/gcc/$(HOST_PREBUILT_TAG)
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# arm64 toolchain
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KERNEL_TOOLCHAIN_arm64 := $(GCC_PREBUILTS)/aarch64/aarch64-linux-android-4.9/bin
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KERNEL_TOOLCHAIN_PREFIX_arm64 := aarch64-linux-android-
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# arm toolchain
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KERNEL_TOOLCHAIN_arm := $(GCC_PREBUILTS)/arm/arm-linux-androideabi-4.9/bin
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KERNEL_TOOLCHAIN_PREFIX_arm := arm-linux-androidkernel-
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# x86 toolchain
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KERNEL_TOOLCHAIN_x86 := $(GCC_PREBUILTS)/x86/x86_64-linux-android-4.9/bin
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KERNEL_TOOLCHAIN_PREFIX_x86 := x86_64-linux-android-
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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
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KERNEL_TOOLCHAIN ?= $(KERNEL_TOOLCHAIN_$(KERNEL_ARCH))
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KERNEL_TOOLCHAIN_PREFIX ?= $(KERNEL_TOOLCHAIN_PREFIX_$(KERNEL_ARCH))
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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
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KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN)/$(KERNEL_TOOLCHAIN_PREFIX)
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endif
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# We need to add GCC toolchain to the path no matter what
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# for tools like `as`
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KERNEL_TOOLCHAIN_PATH_gcc := $(KERNEL_TOOLCHAIN_$(KERNEL_ARCH))/$(KERNEL_TOOLCHAIN_PREFIX_$(KERNEL_ARCH))
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ifneq ($(USE_CCACHE),)
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ifneq ($(CCACHE_EXEC),)
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# Android 10+ deprecates use of a build ccache. Only system installed ones are now allowed
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CCACHE_BIN := $(CCACHE_EXEC)
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endif
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endif
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ifeq ($(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="$(KERNEL_TOOLCHAIN_arm)/$(KERNEL_TOOLCHAIN_PREFIX_arm)"
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KERNEL_CROSS_COMPILE += CROSS_COMPILE_COMPAT="$(KERNEL_TOOLCHAIN_arm)/$(KERNEL_TOOLCHAIN_PREFIX_arm)"
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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 $(nproc)/2
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KERNEL_MAKE_FLAGS += -j$(shell prebuilts/tools-lineage/$(HOST_PREBUILT_TAG)/bin/nproc --all)
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ifeq ($(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 += HOSTCFLAGS="-I$(BUILD_TOP)/external/elfutils/libelf -I/usr/local/opt/openssl/include -fuse-ld=lld" HOSTLDFLAGS="-L/usr/local/opt/openssl/lib -fuse-ld=lld"
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else
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KERNEL_MAKE_FLAGS += CPATH="/usr/include:/usr/include/x86_64-linux-gnu" HOSTCFLAGS="-fuse-ld=lld" HOSTLDFLAGS="-L/usr/lib/x86_64-linux-gnu -L/usr/lib64 -fuse-ld=lld"
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endif
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ifneq ($(TARGET_KERNEL_ADDITIONAL_FLAGS),)
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KERNEL_MAKE_FLAGS += $(TARGET_KERNEL_ADDITIONAL_FLAGS)
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endif
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TOOLS_PATH_OVERRIDE := \
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PATH=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_PREBUILT_TAG)/bin:$$PATH \
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LD_LIBRARY_PATH=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_PREBUILT_TAG)/lib:$$LD_LIBRARY_PATH \
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PERL5LIB=$(BUILD_TOP)/prebuilts/tools-lineage/common/perl-base
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# Set DTBO image locations so the build system knows to build them
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ifeq (true,$(filter true, $(TARGET_NEEDS_DTBOIMAGE) $(BOARD_KERNEL_SEPARATED_DTBO)))
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BOARD_PREBUILT_DTBOIMAGE ?= $(TARGET_OUT_INTERMEDIATES)/DTBO_OBJ/arch/$(KERNEL_ARCH)/boot/dtbo.img
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endif
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# Set use the full path to the make command
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KERNEL_MAKE_CMD := $(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/make
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# Set the full path to the clang command
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KERNEL_MAKE_FLAGS += HOSTCC=$(CLANG_PREBUILTS)/bin/clang
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KERNEL_MAKE_FLAGS += HOSTCXX=$(CLANG_PREBUILTS)/bin/clang++
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# Since Linux 4.16, flex and bison are required
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KERNEL_MAKE_FLAGS += LEX=$(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/flex
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KERNEL_MAKE_FLAGS += YACC=$(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/bison
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KERNEL_MAKE_FLAGS += M4=$(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/m4
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TOOLS_PATH_OVERRIDE += BISON_PKGDATADIR=$(BUILD_TOP)/prebuilts/build-tools/common/bison
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# Set the out dir for the kernel's O= arg
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# This needs to be an absolute path, so only set this if the standard out dir isn't used
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OUT_DIR_PREFIX := $(shell echo $(OUT_DIR) | sed -e 's|/target/.*$$||g')
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KERNEL_BUILD_OUT_PREFIX :=
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ifeq ($(OUT_DIR_PREFIX),out)
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KERNEL_BUILD_OUT_PREFIX := $(BUILD_TOP)/
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endif
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