app.ex

defmodule App do
  @moduledoc """
  Documentation for App.
  """

  @doc """
  Hello world.

  ## Examples

      iex> App.hello()
      :world

  """
  def hello do
    :world
  end

  def main(_) do
    IO.puts "HELLO"
  end
end

config.exs

use Mix.Config

config :elixir, [check_endianness: false]

mix.exs

defmodule App.MixProject do
  use Mix.Project

  def project do
    [
      app: :app,
      version: "0.1.0",
      elixir: "~> 1.9-dev",
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      escript: [main_module: App,
                path: "escript/app"
                # ,
                # emu_args: "-elixir check_endianness false"
               ]
    ]
  end

  # Run "mix help compile.app" to learn about applications.
  def application do
    [
      extra_applications: [:logger]
    ]
  end

  # Run "mix help deps" to learn about dependencies.
  defp deps do
    [
      # {:dep_from_hexpm, "~> 0.3.0"},
      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
    ]
  end
end