Support for Erlang 22

[spkane31]

There was an issue closed about this but I am having similar issues. I added rustler to my dependencies, added the module in my lib/ folder, added the compiler, and added the rustler_crates, but when I try to test the add function from an interactive session I have errors.

For reference here is my latest commit with my rust additions:
https://github.com/spkane31/cc-rankings/compare/rustler

And here is what I did for the interactive session:

iex(1)> alias Rankings.RustNif
Rankings.RustNif
iex(2)> Rankings.RustNif.add(1,2)
[warn] The on_load function for module Elixir.Rankings.RustNif returned:
{:error, {:load_failed, 'Failed to load NIF library: \'/home/sean/github/cc-rankings/rankings/_build/dev/lib/rankings/priv/native/librustnif.so: cannot open shared object file: No such file or directory\''}}

** (UndefinedFunctionError) function Rankings.RustNif.add/2 is undefined (module Rankings.RustNif is not available)
    (rankings) Rankings.RustNif.add(1, 2)
[warn] The on_load function for module Elixir.Rankings.RustNif returned:
{:error, {:load_failed, 'Failed to load NIF library: \'/home/sean/github/cc-rankings/rankings/_build/dev/lib/rankings/priv/native/librustnif.so: cannot open shared object file: No such file or directory\''}}

[NobbZ]

0.16.0 is from february 2018, this version will never be able to support this years OTP version.

Please update to a more recent version of rustler.

[spkane31]

@NobbZ I changed to rustler 0.20.0 (silly mistake on my part) but it still will not run properly. Now I can't get the interactive terminal to load because of the error.
Link to the branch I'm working on:
https://github.com/spkane31/cc-rankings/compare/rustler

Error I get:

16:13:52.619 [error] Process #PID<0.202.0> raised an exception
** (Protocol.UndefinedError) protocol String.Chars not implemented for {:error, :bad_name}
    (elixir) lib/string/chars.ex:3: String.Chars.impl_for!/1
    (elixir) lib/string/chars.ex:22: String.Chars.to_string/1
    lib/rustler.ex:80: Rustler.compile_config/2
    lib/rankings/rustler.ex:2: Nifty.__init__/0
    (kernel) code_server.erl:1340: anonymous fn/1 in :code_server.handle_on_load/5
 
16:13:52.624 [warn]  The on_load function for module Elixir.Nifty returned: 
{%Protocol.UndefinedError{description: "", protocol: String.Chars, value: {:error, :bad_name}}, [{String.Chars, :impl_for!, 1, [file: 'lib/string/chars.ex', line: 3]}, {String.Chars, :to_string, 1, [file: 'lib/string/chars.ex', line: 22]}, {Rustler, :compile_config, 2, [file: 'lib/rustler.ex', ...]}, {Nifty, :__init__, 0, [...]}, {:code_server, :"-handle_on_load/5-fun-0-", 1, ...}]}

Compiling NIF crate :niftest (native/niftest)...
   Compiling erlang_nif-sys v0.6.4
   Compiling backtrace-sys v0.1.30
   Compiling quote v0.6.13
error: failed to run custom build command for `erlang_nif-sys v0.6.4`

Caused by:
  process didn't exit successfully: `/home/sean/github/cc-rankings/rankings/_build/dev/rustler_crates/niftest/debug/build/erlang_nif-sys-ec04123539aeff43/build-script-build` (exit code: 101)
--- stdout
Unsupported Erlang version.

Is the erlang_nif-sys version up to date in the Cargo.toml?
Does 'cargo update' fix it?
If not please report at https://github.com/goertzenator/erlang_nif-sys.```

[NobbZ]

Yeah, now your rustler is up to date, but its dependency is not yet able to talk with current OTP, see:

rusterlium/erlang_nif-sys#37 and rusterlium/erlang_nif-sys#38

[filmor]

The support for Erlang 22 was merged into master, try to reference that instead until a release has been cut.

[ericlathrop]

Is there an ETA of when a version with Erlang 22 support will be released? A library I use doesn't want to have a dependency pointed at master.

[nyo16]

Hi, any estimate for the new release?

[mischov]

@hansihe @scrogson Is there a checklist of things that need to be taken care of before a new release? Is there any way people can help?

[hansihe]

Rustler 0.21.0 has been released. This release includes support for OTP-22.