set -evux -o pipefail

PROTOBUF_VERSION=21.7

ARCH="${ARCH:-x86_64}"

DOWNLOAD_DIR=/tmp/source

INSTALL_DIR="/tmp/protobuf-cache/$PROTOBUF_VERSION/$(uname -s)-$ARCH"

mkdir -p $DOWNLOAD_DIR

NUM_CPU=4

if [[ $(uname) == 'Linux' ]]; then

NUM_CPU=$(nproc)

if [[ $(uname) == 'Darwin' ]]; then

NUM_CPU=$(sysctl -n hw.ncpu)

if [ -f ${INSTALL_DIR}/bin/protoc ]; then

echo "Not building protobuf. Already built"

if [[ ! -d "$DOWNLOAD_DIR"/protobuf-"${PROTOBUF_VERSION}" ]]; then

curl -Ls https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/protobuf-all-${PROTOBUF_VERSION}.tar.gz | tar xz -C $DOWNLOAD_DIR

fi

pushd $DOWNLOAD_DIR/protobuf-${PROTOBUF_VERSION}

# install here so we don't need sudo

if [[ "$ARCH" == x86* ]]; then

./configure CFLAGS=-m${ARCH#*_} CXXFLAGS=-m${ARCH#*_} --disable-shared \

--prefix="$INSTALL_DIR"

elif [[ "$ARCH" == aarch* ]]; then

./configure --disable-shared --host=aarch64-linux-gnu --prefix="$INSTALL_DIR"

elif [[ "$ARCH" == ppc* ]]; then

./configure --disable-shared --host=powerpc64le-linux-gnu --prefix="$INSTALL_DIR"

elif [[ "$ARCH" == s390* ]]; then

./configure --disable-shared --host=s390x-linux-gnu --prefix="$INSTALL_DIR"

elif [[ "$ARCH" == loongarch* ]]; then

./configure --disable-shared --host=loongarch64-unknown-linux-gnu --prefix="$INSTALL_DIR"

fi

# the same source dir is used for 32 and 64 bit builds, so we need to clean stale data first

make clean

make V=0 -j$NUM_CPU

make install

popd

if [[ -L /tmp/protobuf ]]; then

rm /tmp/protobuf

ln -s "$INSTALL_DIR" /tmp/protobuf

cat <<EOF