compile stockfish from github on RHEL into /opt/stockfish

compile_stockfish.sh

#!/usr/bin/env bash
# assumes bmi2 arch: "x86 64-bit with pext support"
# compiled binary ends in /opt/stockfish/$MAJOR_VERSION/bin/stockfish

set -e
set -x

sudo yum update -y
sudo yum install -y git gcc gcc-c++

SF_GH="https://github.com/official-stockfish/Stockfish.git"
SF_DIR="/opt/stockfish"

TMP=$(mktemp -d)

pushd "$TMP"
git clone "$SF_GH" .
pushd src

make clean
make build ARCH=x86-64-bmi2 COMP=gcc
chmod +x stockfish

STOCKFISH_MV=$(echo "uci" | ./stockfish | head -n 1 | cut -d' ' -f2 | cut -c1-2)
STOCKFISH_BIN="$SF_DIR/$STOCKFISH_MV/bin"

sudo mkdir -p "$STOCKFISH_BIN"
sudo chown -R $USER:$USER "$STOCKFISH_BIN"
cp stockfish "$STOCKFISH_BIN"

popd
rm -rf "$TMP"

set +x