# `mix compile.erlang`
[🔗](https://github.com/elixir-lang/elixir/blob/7ff272706afc522e74121493b7166719985cb099/lib/mix/lib/mix/tasks/compile.erlang.ex#L5)

Compiles Erlang source files.

When this task runs, it will first check the modification times of
all files to be compiled and if they haven't been changed since the
last compilation, it will not compile them. If any of them have changed,
it compiles everything.

## Command line options

  * `--all-warnings` (`--no-all-warnings`) - prints all warnings, including previous compilations
    (default is true except on errors)
  * `--force` - forces compilation regardless of modification times
  * `--verbose` - prints verbose output

## Configuration

  * `ERL_COMPILER_OPTIONS` - can be used to give default compile options.
    The value must be a valid Erlang term. If the value is a list, it will
    be used as is. If it is not a list, it will be put into a list.

  * `:erlc_paths` - directories to find source files.
    Defaults to `["src"]`.

  * `:erlc_include_path` - directory for adding include files.
    Defaults to `"include"`.

  * `:erlc_options` - compilation options that apply to Erlang's
    compiler. Defaults to `[]`.

    For a complete list of options, see `:compile.file/2`.
    The option `:debug_info` is always added to the end of it.
    You can disable that using:

        erlc_options: [debug_info: false]

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*Consult [api-reference.md](api-reference.md) for complete listing*