marcandre
Specifying minimal Erlang version in mix.exs
Is it still not possible to specify Erlang compatibility in mix.exs?
Erlang/OTP is a dependency of Elixir, so it is an indirect dependency of any mix projects, but it may be a direct dependency too. mix.exs should be able to convey that and mix should be able to resolve dependencies handling this too.
As a practical example, :crypto.hmac/3 no longer exists in OTP 24, one must use :crypto.mac/4 which is OTP 22+
If a package maintainer wants to use :crypto.mac/4, the only easy choice is to require the shiny new Elixir 1.12, because Elixir 1.11 is compatible with OTP 21
Ideally one could say: compatible with Elixir >= 1.7 but OTP >= 22.
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josevalim
Correct, it is still not supported because we want to avoid adding multiple dimensions for system dependencies. So in this sense it would be preferable to either supporting v1.7 and all OTP versions by checking which crypto function is available (that’s what we did in plug_crypto) or bumping to v1.12.
However, if occurrences like this keep happening, then we should probably be more pragmatic and allow the OTP dependency.
eksperimental
Interesting request. Totally doable.
https://github.com/eksperimental/otp_dependency/commit/689e3e309118cc79a3cc162ff4a023764d54a952
It will not compile if it does not meet the :otp dependency requirement.
$ mix
** (Mix) You're trying to run :otp_dependency on Erlang/OTP 24.0.0 but it has declared in its mix.exs file it supports only Erlang/OTP ~> 24.1
josevalim
It doesn’t work on dependency resolution. It just emits a warning (or raise) if you don’t have a matching version. If this behaviour is enough for you, then you can check for the OTP release in your mix.exs.
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