#!/bin/bash

HOST="aarch64-linux-android"
ANDROID_NDK_TOOLCHAIN_DIR=""

#parse arguments
for arg in "$@"
do
  case $arg in
    -h=*|--host=*)
      HOST="${arg#*=}"
      shift
      ;;
    -t=*|--toolchain=*)
      ANDROID_NDK_TOOLCHAIN_DIR="${arg#*=}"
      shift
      ;;
  esac
done

#validate arguments

function print_help {
cat << EOF
Usage: $0 [OPTION]... [VAR=VALUE]...

  --host=HOST         cross-compile to build programs to run on HOST [default: aarch64-linux-android]
  --toolchain=DIR     Android NDK standalone toolchain

Example usage: $0 --host=aarch64-linux-android --toolchain=/ram/arm

EOF
  exit 0
}

if [[ ! -d $ANDROID_NDK_TOOLCHAIN_DIR ]]; then
  print_help
fi

# configure

ANDROID_NDK_ROOT=${ANDROID_NDK_TOOLCHAIN_DIR}
ANDROID_NDK_BIN="${ANDROID_NDK_ROOT}/bin"
ANDROID_SYSROOT_DIR="${ANDROID_NDK_ROOT}/sysroot"

COMPILER_PREFIX=$HOST
export CC=${ANDROID_NDK_BIN}/${COMPILER_PREFIX}-gcc
export CPP=${ANDROID_NDK_BIN}/${COMPILER_PREFIX}-cpp
export CXX=${ANDROID_NDK_BIN}/${COMPILER_PREFIX}-g++
export LD=${ANDROID_NDK_BIN}/${COMPILER_PREFIX}-ld
export AR=${ANDROID_NDK_BIN}/${COMPILER_PREFIX}-ar
export RANLIB=${ANDROID_NDK_BIN}/${COMPILER_PREFIX}-ranlib
export STRIP=${ANDROID_NDK_BIN}/${COMPILER_PREFIX}-strip

./configure --host="${COMPILER_PREFIX}" --disable-aes-ni --with-sysroot="${ANDROID_SYSROOT_DIR}"