build.sh

#!/usr/bin/env bash

if [ $# -eq 0 ]; then
    echo "Usage: $0 <kernel_directory>"
    exit 1
fi

KERNEL_DIR="$1"
TOOLCHAIN_DIR="$(pwd)/toolchain"
CLANG_DIR="$TOOLCHAIN_DIR/clang-r383902"
GCC_DIR="$TOOLCHAIN_DIR/aarch64-linux-android-4.9"

if [ ! -d "$KERNEL_DIR" ]; then
    echo "Error: Kernel directory '$KERNEL_DIR' does not exist"
    exit 1
fi

if [ ! -d "$CLANG_DIR" ]; then
    echo "Downloading CLANG toolchain..."
    mkdir -p "$TOOLCHAIN_DIR"
    cd "$TOOLCHAIN_DIR"
    wget -O clang-r383902.tar.gz "https://android.googlesource.com/platform//prebuilts/clang/host/linux-x86/+archive/3857008389202edac32d57008bb8c99d2c957f9d/clang-r383902.tar.gz"
    mkdir -p clang-r383902
    tar -xzf clang-r383902.tar.gz -C clang-r383902
    rm clang-r383902.tar.gz
    cd - > /dev/null
fi

if [ ! -d "$GCC_DIR" ]; then
    echo "Downloading GCC toolchain..."
    mkdir -p "$TOOLCHAIN_DIR"
    cd "$TOOLCHAIN_DIR"
    git clone -b lineage-18.1 https://github.com/LineageOS/android_prebuilts_gcc_linux-x86_aarch64_aarch64-linux-android-4.9.git aarch64-linux-android-4.9
    cd - > /dev/null
fi

cd "$KERNEL_DIR"

export PATH="$CLANG_DIR/bin:$GCC_DIR/bin:$PATH"
export ARCH=arm64
export CLANG_TRIPLE=aarch64-linux-gnu-
export CROSS_COMPILE=aarch64-linux-androidkernel-
export CC=clang
export LD=ld.lld
export AR=llvm-ar
export NM=llvm-nm
export OBJCOPY=llvm-objcopy
export OBJDUMP=llvm-objdump
export READELF=llvm-readelf
export OBJSIZE=llvm-size
export STRIP=llvm-strip

make O=out kobe2_defconfig -j$(nproc --all)
make O=out -j$(nproc --all)