setup_toolchains_local.sh

#!/usr/bin/env bash

# This script sets up the necessary toolchains to build for Android.

set -eu

# Keep these 3 in sync.
TARGET_ARCHS=("x86" "arm64" "arm")
RUST_TARGETS=("i686-linux-android" "armv7-linux-androideabi" "aarch64-linux-android")
CLANG_BINS=("i686-linux-android-clang" "arm-linux-androideabi-clang" "aarch64-linux-android-clang")

if [ "$#" -ne 1 ]; then
    echo "Usage:"
    echo "./setup_toolchains_local.sh <ANDROID_NDK_HOME>"
    exit 1
fi
ANDROID_NDK_HOME=$1

source "$(dirname "$0")/android_defaults.sh"
mkdir -p $ANDROID_NDK_TOOLCHAIN_DIR
echo "Installing toolchains for the following architectures: ${TARGET_ARCHS[@]}."
echo "The toolchains will be installed in $ANDROID_NDK_TOOLCHAIN_DIR (ANDROID_NDK_TOOLCHAIN_DIR)."
echo "The Android API version is set to $ANDROID_NDK_API_VERSION (ANDROID_NDK_API_VERSION)."
echo ""

# Toolchains installation
for ARCH in "${TARGET_ARCHS[@]}"; do
  if [ ! -d "$ANDROID_NDK_TOOLCHAIN_DIR/$ARCH-$ANDROID_NDK_API_VERSION" ]; then
    echo "Installing $ARCH toolchain..."
    python "$ANDROID_NDK_HOME/build/tools/make_standalone_toolchain.py" --arch="$ARCH" --api="$ANDROID_NDK_API_VERSION" --install-dir="$ANDROID_NDK_TOOLCHAIN_DIR/$ARCH-$ANDROID_NDK_API_VERSION" --deprecated-headers --force
  else
    echo "$ARCH toolchain already exists. Skipping installation."
  fi
done

# Setup cargo linkers
CONFIG_FILE="$(dirname "$0")/../.cargo/config"
read -p "Would you like to set-up the toolchain linkers in .cargo/config? (you should say yes) " -n 1 -r
echo ""
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
  exit 0
fi

mkdir -p "$(dirname "$0")/../.cargo"
echo -n "" > $CONFIG_FILE # Clear the file first
for i in "${!TARGET_ARCHS[@]}"; do
  ARCH=${TARGET_ARCHS[$i]}
  RUST_TARGET=${RUST_TARGETS[$i]}
  CLANG_BIN=${CLANG_BINS[$i]}
  echo "[target.$RUST_TARGET]
linker = \"$ANDROID_NDK_TOOLCHAIN_DIR/$ARCH-$ANDROID_NDK_API_VERSION/bin/$CLANG_BIN\"
" >> $CONFIG_FILE
done
echo "Cargo config written to $CONFIG_FILE."