message: Update setup script to install C++ complier
  Closes:
  Approved by: wqfish
diff: @@ -52,6 +52,7 @@ This script will download and install the necessary dependencies needed to
  build Libra Core. This includes:
  * Rust (and the necessary components, e.g. rust-fmt, clippy)
  * CMake
  + * Clang
  If you'd prefer to install these dependencies yourself, please exit this script
  now with Ctrl-C.
  @@ -102,6 +103,20 @@ else
  fi
  fi
  +echo "Installing Clang......"
  +if which clang &>/dev/null; then
  + echo "Clang is already installed"
  +else
  + if [[ "$PACKAGE_MANAGER" == "yum" ]]; then
  + sudo yum install clang -y
  + elif [[ "$PACKAGE_MANAGER" == "apt-get" ]]; then
  + sudo apt-get install clang -y
  + elif [[ "$PACKAGE_MANAGER" == "pacman" ]]; then
  + sudo pacman -Syu clang --noconfirm
  + elif [[ "$PACKAGE_MANAGER" == "brew" ]]; then
  + brew install llvm
  + fi
  +fi
  cat <<EOF
  Finished installing all dependencies.
  