a836d79629
Kernel source settings should always come at BoardConfig population time so things that use the variable later don't end up pointing to an empty or wrong variable. The following is also squashed in: Author: Christopher N. Hesse <raymanfx@gmail.com> Date: Fri Aug 10 00:23:54 2018 +0200 tasks: kernel: Honor prebuilt kernel flag For devices that want to use a prebuilt kernel, TARGET_KERNEL_SOURCE would still be set to TARGET_AUTO_KDIR, meaning the build system would still try to build the kernel if TARGET_AUTO_KDIR was present. Setting TARGET_PREBUILT_KERNEL indicates this is not wanted, so don't attempt to do it. Change-Id: Ic79b3ac1b9c946fd258ada43dce2b08bb74ea0d9 Change-Id: If046b86ff0d18c76898e90295be873a8379f678a
112 lines
4.2 KiB
Makefile
112 lines
4.2 KiB
Makefile
# 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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KERNEL_TOOLCHAIN_PREFIX ?= aarch64-linux-androidkernel-
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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 := $(KERNEL_TOOLCHAIN_PREFIX)
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else
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ifneq ($(KERNEL_TOOLCHAIN_PREFIX),)
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KERNEL_TOOLCHAIN_PATH := $(KERNEL_TOOLCHAIN)/$(KERNEL_TOOLCHAIN_PREFIX)
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endif
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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-androidkernel-"
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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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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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