GenServer + defmacro bug ???

[João Bernardo]

Hi !

I defined a macro like this:

```

defmodule Test do

  defmacro __using__ do

    quote do

      require Test

      import Test

    end

  end

  defmacro my_macro do

    quote do

      Gernserver.call() # generic server call from other module

    end

  end

end

```

I have this code inside a lib which I am building. When testing this lib in a different application I get a compile error on the file which has the `use Test`.

Error: `exited in: GenServer.call ...` `exit no process` (on the line of the my_macro call, more specifically on the genserver call). As if the genserver was not running, and it is not because it is compile time.

Adding a simple Application.ensure_all_started(:lib_name) to the __using__ macro seems to fix the problem. But then again, at compile time the code shouldn't be running, am I right ? Or is here something I am not seeing ? Maybe I can not use genserver calls on a macro ? Or is it a bug ?

Thanks.

[José Valim]

You need to provide more information. Possibly a mechanism to reproduce the bug. Otherwise, we will be all at guesses of what went wrong. You are right the code should not be executed at compile time as long as you are calling the GenServer inside a function.

If you are not sure it is an Elixir bug, it is probably better to move the discussion elsewhere, such as Stack Overflow or Elixir Forum.

[João Bernardo]

Yep you're right, I've been at the elixir slack but no one seemed to get an answer. I will post it to Stack Overflow.