Using Rustler with OTP24

Ah OK, that makes perfect sense and I didn’t realize. Thanks for letting me know

The reason the approach above has been recommended is just one: rustler maintainers seem to be active again and we can expect a stable next release soon.

If not for that factor then I’d go with what you recommended.

(Gah, I’m sorry to double post, I messed up making an edit.)

You can override the version rustler is looking for with an ENV variable:

$ RUSTLER_NIF_VERSION=2.15 mix compile

This is the easiest way to make progress (I’ve found) without having to re-target any deps or anything.

Am I missing some downsides to doing this? I think rustler works just fine targeting the older nif version in my experience.

I’d try both things:

• Use the commented out line in your mix.exs:

{:rustler, git: "git://github.com/rusterlium/rustler.git" branch: "master", sparse: "rustler_mix"},

• Put this into your Cargo.toml as @maciejgryka showed:

rustler = {git = "git://github.com/rusterlium/rustler.git", branch="master"}

defp deps do

    [

      {:tzdata, "~> 1.1.0"},

      {:gen_smtp, "~> 1.0"},

      {:mime, "~> 1.4"},

      {:fs, "~> 4.10.0"},

      # {:circuits_uart, "~> 1.4"},

      {:jason, "~> 1.2"},

      {:meeseeks, "~> 0.15.1"},

      {:decimal, "~> 2.0"},

      {:tesla, "~> 1.3"},

      {:castore, "~> 0.1.0"},

      # {:rustler, git: "git://github.com/rusterlium/rustler.git" branch: "master", sparse: "rustler_mix"},

      {:rustler, "~> 0.22.0-rc.1", override: true}

    ]

  end

Show us your mix.exs?

Still have the same issues after this update. Previously working code will not compile anymore.

   Compiling quote v1.0.7
   Compiling rustler_codegen v0.22.0-rc.1
error[E0432]: unresolved imports `rustler_sys::TWinDynNifCallbacks`, `rustler_sys::WIN_DYN_NIF_CALLBACKS`
  --> C:\Users\Charles Okwuagwu\.cargo\registry\src\github.com-1ecc6299db9ec823\rustler-0.22.0-rc.1\src\codegen_runtime.rs:16:23
   |
16 | pub use rustler_sys::{TWinDynNifCallbacks, WIN_DYN_NIF_CALLBACKS};
   |                       ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^ no `WIN_DYN_NIF_CALLBACKS` in the root
   |                       |
   |                       no `TWinDynNifCallbacks` in the root

error: aborting due to previous error

For more information about this error, try `rustc --explain E0432`.
error: could not compile `rustler`

To learn more, run the command again with --verbose.

== Compilation error in file lib/nif.ex ==
** (RuntimeError) Rust NIF compile error (rustc exit code 101)
    (rustler 0.22.0-rc.1) lib/rustler/compiler.ex:36: Rustler.Compiler.compile_crate/2
    lib/nif.ex:2: (module)
    (stdlib 3.15) erl_eval.erl:685: :erl_eval.do_apply/6

There’s a 0.22.0-rc.1 release that got out like 45 minutes ago.

@maciejgryka What you have shown have worked for me for Elixir 1.12.0-otp-24 and Erlang 24.0.1. Thanks!

(I still used rustler from the master branch, though.)

no luck compiling {:meeseeks, "~> 0.15.1"}, even with the specified updates.

I had the same problem - it all seems to work after you use the git checkout option both in your mix.exs as well as Cargo.toml (a short blog post about this here).

I was missing the Cargo.toml step for a long time leading me to being stuck with 0.22.0-rc.0 there and still getting the version error.

To summarize, I’ve added this to mix.exs (thanks for the sparse tip @josevalim):

{:rustler, git: "git://github.com/rusterlium/rustler.git", branch: "master", sparse: "rustler_mix"},

And this to Cargo.toml:

rustler = {git = "git://github.com/rusterlium/rustler.git", branch="master"}