Create android standalone toolchains

create_toolchain.sh

#!/bin/bash

# Either pass in the dest directory, or will install to current dir

# from 
# https://gist.github.com/bongole/304a006a5386220246aa
for arch in armv7-a x86 x86_64; do
    echo "Create standalone for $arch"
    case $arch in
        arm*)
            ANDROID_ARCH=arm-linux-androideabi
            $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --platform=android-21 --toolchain=arm-linux-androideabi-4.9 --install-dir=$DEST/toolchain/$arch
            INSTALL_PATH=$PWD/build
            HOST=arm-linux-androidabi
            GCC_ARCH=$arch
            EXTRA_CFLAGS="-mfloat-abi=softfp"
            EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
            ;;
        x86)
            ANDROID_ARCH=i686-linux-android
            $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --platform=android-21 --toolchain=x86-4.9 --install-dir=$DEST/toolchain/$arch
            INSTALL_PATH=$PWD/build
            HOST=i686-linux-android
            GCC_ARCH=atom
            EXTRA_CFLAGS=""
            EXTRA_LDFLAGS=""
            ;;
        x86_64)
            ANDROID_ARCH=x86_64-linux-android
            $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --platform=android-21 --toolchain=x86_64-4.9 --install-dir=$DEST/toolchain/$arch
            INSTALL_PATH=$PWD/build
            HOST=x86_64-linux-android
            GCC_ARCH=atom
            EXTRA_CFLAGS=""
            EXTRA_LDFLAGS=""
            ;;
    esac
done