Rebar_mix how to use in erlang rebar projects

Questions / Help
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1

Hello! I need to use elixir lib in my erlang project. I add plugin {plugins, [rebar_mix]}. in rebar.config file and add my elixir library in deps. After that I run rebar3 install_deps && rebar3 compile. It fetched and compiled dependencies without problems. Then I ran application and got error ** exception error: undefined function 'Elixir.GenServer':start_link/3. Elixir and erlang installed in system with asdf. elixir 1.7.4, erlang 21.2.7, rebar3 3.9.1

What is wrong with my configurations? Can I find somewhere examples of using rebar_mix?

Thanks! :slight_smile:

2

Have you added Elixir as a dependency to your Rebar project? I do not think that rebar_mix does that for you.

3

No, I thought it should use system elixir

4

It uses the system elixir to compile but depending on how you run the application it might not be able to find elixir.

How are you running your project? rebar3 shell? A release? something else?

5

According to the projects README, you also need to specify some hooks:

{provider_hooks, [
  {pre,  [{compile, {mix, find_elixir_libs}}]},
  {post, [{compile, {mix, consolidate_protocols}}]}
]}.
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6

Oh, and these PRs I forgot about that are probably exactly what OP is looking for :slight_smile:

https://github.com/tsloughter/rebar_mix/pulls

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7

I merged the PR that should help with release creation.

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