Script for setting up environment for Android NDK

SetEnv.sh

#!/bin/bash

if [ $# -lt 1 ]; then
    echo >&2 "Usage: SetEnv.sh <android-arch> [min-sdk-version]"
    return 1
fi

if [ -z "$NDK" ]; then
    echo >&2 "Missing 'NDK' environment variable"
    return 1
fi

export BUILD_HOST=$(uname -s | tr '[:upper:]' '[:lower:]')-$(uname -p)
export ANDROID_ARCH=$1
export MIN_SDK_VERSION=$2
if [ -z "$MIN_SDK_VERSION" ]; then
    export MIN_SDK_VERSION=21
fi

if [ $ANDROID_ARCH = "x86" ]; then
    export ANDROID_ABI="x86"
    export TARGET_HOST="i686-linux-android"
elif [ $ANDROID_ARCH = "x86_64" ]; then
    export ANDROID_ABI="x86-64"
    export TARGET_HOST="x86_64-linux-android"
elif [ $ANDROID_ARCH = "arm" ]; then
    export ANDROID_ABI="armeabi-v7a"
    export TARGET_HOST="armv7a-linux-androideabi"
elif [ $ANDROID_ARCH = "arm64" ]; then
    export ANDROID_ABI="arm64-v8a"
    export TARGET_HOST="aarch64-linux-android"
else
    echo >&2 "Unknown Android arch '$ANDROID_ARCH'"
    return 1
fi

export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/$BUILD_HOST
export SYSROOT=$TOOLCHAIN/sysroot

export CC=$TOOLCHAIN/bin/$TARGET_HOST$MIN_SDK_VERSION-clang
export CXX=$TOOLCHAIN/bin/$TARGET_HOST$MIN_SDK_VERSION-clang++
export AR=$TOOLCHAIN/bin/$TARGET_HOST-ar
export AS=$TOOLCHAIN/bin/$TARGET_HOST-as
export LD=$TOOLCHAIN/bin/$TARGET_HOST-ld
export NM=$TOOLCHAIN/bin/$TARGET_HOST-nm
export STRIP=$TOOLCHAIN/bin/$TARGET_HOST-strip
export STRINGS=$TOOLCHAIN/bin/$TARGET_HOST-strings

PREFIX_RELATIVE=$(dirname $0)/../prebuild/$ANDROID_ABI
[ -d $PREFIX_RELATIVE ] || mkdir -p $PREFIX_RELATIVE

export PREFIX=$(realpath $PREFIX_RELATIVE)

export CFLAGS="-fPIE -fPIC"

export CPATH=$PREFIX/include:$PREFIX/include/libxml2
export CMAKE_INCLUDE_PATH=$CPATH

export LIBRARY_PATH=$PREFIX/lib
export LD_LIBRARY_PATH=$LIBRARY_PATH
export CMAKE_LIBRARY_PATH=$LIBRARY_PATH

android-cmake() {
    cmake \
        -DCMAKE_BUILD_TYPE=Release \
        -DCMAKE_TOOLCHAIN_FILE=$NDK/build/cmake/android.toolchain.cmake \
        -DCMAKE_INSTALL_PREFIX=$PREFIX \
        -DANDROID_NDK=$NDK \
        -DANDROID_TOOLCHAIN=$CC \
        -DANDROID_ABI=$ANDROID_ABI \
        -DANDROID_NATIVE_API_LEVEL=$MIN_SDK_VERSION \
        -DANDROID_CPP_FEATURES="rtti exceptions" \
        $@
}