removed pointless option: this is meant for web services using Isabelle/Scala, not command-line tools;
#!/usr/bin/env bash
#
# Multi-platform build script
THIS="$(cd "$(dirname "$0")"; pwd)"
PRG="$(basename "$0")"
# diagnostics
function usage()
{
  echo
  echo "Usage: $PRG TARGET"
  echo
  exit 1
}
function fail()
{
  echo "$1" >&2
  exit 2
}
# command line args
[ "$#" -eq 0 ] && usage
TARGET="$1"; shift
[ "$#" -eq 0 ] || usage
# main
mkdir -p "$TARGET"
case "$TARGET" in
  x86_64-linux | x86_64-darwin)
    cc -m64 bash_process.c -o "$TARGET/bash_process"
    ;;
  x86-linux | x86-darwin)
    cc -m32 bash_process.c -o "$TARGET/bash_process"
    ;;
  x86-cygwin)
    cc bash_process.c -o "$TARGET/bash_process.exe"
    ;;
  *)
    cc bash_process.c -o "$TARGET/bash_process"
    ;;
esac