rayex
Cannot compile an Erlang dependency in an Elixir project
Hi,
I am using the following versions:
Erlang/OTP 27 [erts-15.1] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns]
Elixir 1.18.4 (compiled with Erlang/OTP 27)
I am compiling an Identicon project based on the one by Stephen Grider.
In this project, I use the following dependency:
{:egd24, “~> 0.10”}
Unfortunately, when compiling this dependency, I get a compile error:
mix deps.compile egd24
===> Analyzing applications...
===> Compiling string_compat
===> Compiling bbmustache
===> Compiling _build/default/plugins/bbmustache/src/bbmustache.erl failed
ââ _build/default/plugins/bbmustache/src/bbmustache.erl:
â
622 â -spec check_data_type(data() | term()) -> boolean() | maybe.
â â°ââ syntax error before: 'maybe'
ââ _build/default/plugins/bbmustache/src/bbmustache.erl:
â
624 â check_data_type([]) -> maybe;
â â°ââ syntax error before: ';'
ââ _build/default/plugins/bbmustache/src/bbmustache.erl:
â
181 â case check_data_type(Data) of
â â°ââ function check_data_type/1 undefined
ââ _build/default/plugins/bbmustache/src/bbmustache.erl:
â
207 â case check_data_type(Value) of
â â°ââ function check_data_type/1 undefined
ââ _build/default/plugins/bbmustache/src/bbmustache.erl:
â
592 â case check_data_type(Data) =:= true andalso find_data(convert_keytype(Key, State), Data) of
â â°ââ function check_data_type/1 undefined
Any help appreciated…
Thanks, 
Most Liked
al2o3cr
maybe was introduced as an Erlang feature in OTP 27.
You can disable it partially using a couple different methods:
I suspect there’s a way to pass the required options for just one dependency when building with mix deps, but I don’t see a good example of it.
The easiest approach would be to copy bbmustache locally and add -feature(maybe_expr, disable) to the top of bbmustache.erl.
rayex
Hi,
I found a better solution thanks to the advise of Hinagiku Soranoba (the publisher of bbmustache).
I updated file rebar.config of the egd app to use the latest version of rebar3_appup_pluginlike so:
%% -*- erlang -*-
% {plugins, [rebar3_appup_plugin]}.
{plugins, [{rebar3_appup_plugin, "2.4.8"}]}.
{provider_hooks, [{post, [{compile, {appup, compile}},
{clean, {appup, clean}}]}
]}.
{otpdoc_opts, [{edoc_modules, [egd]}]}.
%% vim: ft=erlang
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