android-kernel-tools

Kernel Toolchains

AOSP (GCC & Clang ) and Snapdragon Clang

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How to compile android kernel? Detailed Instructions Here.
Install latest version of Make from Here.

Instructions here are only for Linux OS machines, don't get messed in Windows unless you know how to use properly.

Getting Started

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How to use these toolchains for compiling android Kernels ?

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1. Clone this toolchain repo in tools folder

   $ git clone --depth=1 https://github.com/pkm774/android-kernel-tools tools
   

2. Install required packages, for Debian distros :

   $ sudo apt-get update && sudo apt-get upgrade -y
   $ sudo apt-get install gcc-aarch64-linux-gnu -y
   

   -> Now compile using AOSP clang or Snapdragon clang.

For using AOSP clang:

1. Set path for the toolchains.

   $	PATH="tools/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin:$PATH"
   $	PATH="tools/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin:$PATH"
   $	PATH="tools/clang/host/linux-x86/clang-r428724/bin:$PATH"
   $	export LD_LIBRARY_PATH="tools/clang/host/linux-x86/clang-r428724/lib64:$LD_LIBRARY_PATH"
   

2. Export required flags

   $	export ARCH=arm64
   $	export SUBARCH=ARM64
   $	export CLANG_TRIPLE=aarch64-linux-gnu-
   $	export CROSS_COMPILE=aarch64-linux-android-
   $	export CROSS_COMPILE_ARM32=arm-linux-androideabi-
   

ARCH & SUBARCH according to your device.

1. Use these command for compiling with AOSP clang.

   $ make \
   	O=out \
   	clean \
   	mrproper \
   	CC=clang \
   	AR=llvm-ar \
   	NM=llvm-nm \
   	OBJCOPY=llvm-objcopy \
   	OBJDUMP=llvm-objdump \
   	READELF=llvm-readelf \
   	OBJSIZE=llvm-size \
   	STRIP=llvm-strip \
   	HOSTCC=clang \
   	HOSTCXX=clang++ \
   	${DEVICE}_defconfig
     
   $ make \
   	O=out \
   	CC=clang \
   	AR=llvm-ar \
   	NM=llvm-nm \
   	OBJCOPY=llvm-objcopy \
   	OBJDUMP=llvm-objdump \
   	READELF=llvm-readelf \
   	OBJSIZE=llvm-size \
   	STRIP=llvm-strip \
   	HOSTCC=clang \
   	HOSTCXX=clang++ \
   	-j$(nproc --all)
   

{DEVICE}_defconfig is the kernel config file used to compile kernel. Kernel binaries will be produced in out directory.

For using Snapdragon clang:

1. Set path for the toolchain.

   $	PATH="$TOP/tools/sdclang/linux-x86_64/bin:$PATH"
   

2. Export required flags.

   $	export ARCH=arm64
   $	export SUBARCH=ARM64
   $	export CROSS_COMPILE=aarch64-linux-gnu-
   $	export CROSS_COMPILE_ARM32=arm-linux-gnueabi-
   

ARCH & SUBARCH according to your device.

1. Use these command for compiling with Snapdragon clang.

   $ make \
   	O=out \
   	clean \
   	mrproper \    
   	CC=clang \
   	${DEVICE}_defconfig
       
   $ make \
   	O=out \    
   	CC=clang \
   	-j$(nproc --all)
   

{DEVICE}_defconfig is the kernel config file used to compile kernel. Kernel binaries will be produced in out directory.

# It will be easy to compile kernel with a bash script. Make a bash script in kernel folder and set toolchain path according to your folders.

AOSP clang is taken from : Android Open Source Project.
Snapdragon clang is taken from : developer.qualcomm.com.
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