Script to compile the OpenSSL project to LLVM Bitcode on a Linux system.

compile_to_bitcode.sh

#!/bin/bash
#!/usr/bin/env bash
# Run this script in the main directory of openssl.
# Requires python3


set -e

# download necessary parsing script
wget https://gist.githubusercontent.com/quend/e44520133e2cd8a6da98ce1c2a02a7b1/raw/8c93794dc2dc6cdd84255eb2de8416b59cf53a9b/comp_db_generate.py

# Install Bear
onerr() {
    echo "Errored"
}
trap onerr ERR

# First, install bear
mkdir -p bear/build

wget -O Bear-2.2.0.tar.gz https://github.com/rizsotto/Bear/archive/2.2.0.tar.gz
tar xfz Bear-2.2.0.tar.gz --strip-components=1 -C bear

pushd bear/build
cmake .. 
make 
sudo make install
popd
echo "[+] Bear Installed"


# Install updated llvm
BUILD_DIR=$(dirname $0)/build
LLVM_DIR=llvm

ARCH=$(uname -m)
LLVM_VER=3.8.0

case $(uname -s) in
  Darwin)
    OS=apple-darwin
    FILE=clang+llvm-${LLVM_VER}-${ARCH}-${OS}.tar.xz
    ;;
  Linux)
    OS=linux-gnu
    DISTRO=$(lsb_release -si | tr '[:upper:]' '[:lower:]')
    DIST_VERSION=$(lsb_release -sr)
    if [ $DIST_VERSION == "15.04" ]; then
	    DIST_VERSION="14.04"
    fi
    FILE=clang+llvm-${LLVM_VER}-${ARCH}-${OS}-${DISTRO}-${DIST_VERSION}.tar.xz
    ;;
  *)
    echo '[!] Unsupported OS'
    exit 1
    ;;
esac


echo "[+] Creating '${BUILD_DIR}'"
mkdir -p ${BUILD_DIR}
cd ${BUILD_DIR}

if [ ! -f ${FILE} ]; then
  echo "[+] Downloading Clang+LLVM.."
  wget http://llvm.org/releases/${LLVM_VER}/${FILE}

  if [ "$?" != "0" ]; then
    echo "[!] Unsupported operating system."
    echo "[!]  Check http://llvm.org/releases/${LLVM_VER}/ to see what LLVM"
    echo "[!]  packages are available."
    exit 2
  fi

fi

if [ ! -d ${LLVM_DIR} ]; then
  echo "[+] Extracting.."
  mkdir ${LLVM_DIR}
  tar xf ${FILE} -C ${LLVM_DIR} --strip-components=1 
fi
echo "[+] LLVM Installed"



# Build openssl, this is needed so the autogenerated dependancy files are there when we create bc.
./config
make clean build_libs

# Build the bear database
bear -n -o compile_db.json sh -c 'make clean build_libs'

# Parse and alter the database to output a build script that will build LLVM bitcode.
python3 comp_db_generate.py -o ./build.sh -l llvm compile_db.json generate 
/bin/bash ./build.sh 

echo "Built bitcode files (2) "
ls *.bc