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kernel: Use LLVM's substitutes for GNU binutils if possible

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Co-authored-by: LuK1337 <priv.luk@gmail.com>
Change-Id: I06884fb774b6548aad68942f1ce659384521c62a
This commit is contained in:
Alexander Koskovich
2022-06-15 08:46:57 -07:00
committed by Michael Bestas
parent 87c0acd05e
commit 09a874fe75
1 changed files with 15 additions and 1 deletions
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16
config/BoardConfigKernel.mk
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@@ -1,4 +1,4 @@
# Copyright (C) 2018-2020 The LineageOS Project
# Copyright (C) 2018-2022 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.
@@ -28,6 +28,9 @@
# x86_64-linux-android- for x86
#
# TARGET_KERNEL_CLANG_COMPILE = Compile kernel with clang, defaults to true
# TARGET_KERNEL_VERSION = Reported kernel version in top level kernel
# makefile. Can be overriden in device trees
# in the event of prebuilt kernel.
#
# KERNEL_TOOLCHAIN_PREFIX = Overrides TARGET_KERNEL_CROSS_COMPILE_PREFIX,
# Set this var in shell to override
@@ -49,6 +52,10 @@ else
KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
endif
KERNEL_VERSION := $(shell grep "^VERSION = " $(TARGET_KERNEL_SOURCE)/Makefile | awk '{ print $$3 }')
KERNEL_PATCHLEVEL := $(shell grep "^PATCHLEVEL = " $(TARGET_KERNEL_SOURCE)/Makefile | awk '{ print $$3 }')
TARGET_KERNEL_VERSION ?= $(shell echo $(KERNEL_VERSION)"."$(KERNEL_PATCHLEVEL))
CLANG_PREBUILTS := $(BUILD_TOP)/prebuilts/clang/host/$(HOST_PREBUILT_TAG)/clang-r416183b1
GCC_PREBUILTS := $(BUILD_TOP)/prebuilts/gcc/$(HOST_PREBUILT_TAG)
# arm64 toolchain
@@ -147,6 +154,13 @@ KERNEL_MAKE_CMD := $(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/m
KERNEL_MAKE_FLAGS += HOSTCC=$(CLANG_PREBUILTS)/bin/clang
KERNEL_MAKE_FLAGS += HOSTCXX=$(CLANG_PREBUILTS)/bin/clang++
# Use LLVM's substitutes for GNU binutils if compatible kernel version.
ifneq ($(TARGET_KERNEL_CLANG_COMPILE), false)
ifneq (,$(filter 5.4, $(TARGET_KERNEL_VERSION)))
KERNEL_MAKE_FLAGS += LLVM=1 LLVM_IAS=1
endif
endif
# Since Linux 4.16, flex and bison are required
KERNEL_MAKE_FLAGS += LEX=$(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/flex
KERNEL_MAKE_FLAGS += YACC=$(BUILD_TOP)/prebuilts/build-tools/$(HOST_PREBUILT_TAG)/bin/bison