jimsynz
Hi folks.
In my project I needed a way to check to see if a process was running on the host system (mainly when MIX_TARGET=:host) so I quickly wrapped up the proclist crate with Rustler however my firmware doesn’t start complaining about missing shared libraries (basically it’s not cross-compiling it’s just lucky that my laptop and the firmware have the same arch). The main article I can find talks you through setting up a nerves project with rustler crates in-tree but it doesn’t help with rustler-based dependencies. Now in my case, since I only use this package when doing dev on my laptop, I can just disable it for all other targets, which is fine, but I think we need to figure out a way to make the increasing number of rustler-based packages work nicely in the nerves ecosystem.
What tooling do we need that is missing? I expect we’d need some changes to rustler itself - I’m happy to open and shepherd some PRs if that’s the case.
Where Next?
Trending in Questions
Other Trending Topics
Latest Nerves Threads
Latest on Elixir Forum
Sponsor Spotlight
Master modern tools, write cleaner code, and tackle real-world challenges with Manning books, videos, and courses. Start building today.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ai
- #ecto-query
- #elixirconf-us
- #blog-post
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #elixirconf-eu
- #api
- #forms
- #metaprogramming
- #hex
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Bringing learning, work and compliance together since 1987.
**Building the future of software with AI, trust, and human connection.**
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 2- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
gus
I’ve used Rustler on Nerves before, and fortunately it exposes ways to support cross compile, namely through the
RUSTLER_TARGETenvironment variable. Cocoa has a really good guide on it here:https://cocoa-research.works/2022/01/use-rustler-with-nerves-cross-compile/
There’s also a
:targetconfiguration option for the Rustler package:You might just be able to set that to the target triple on your Nerves device in your
config/target.exs. But there might also be some more steps that would be required to get it to work on Nerves - it looks like Cocoa’s method explicitly sets the linker withSystem.get_env("CC") |> tap(&System.put_env("RUSTFLAGS", "-C linker=#{&1}")), so that might also be requiredjimsynz
Thanks @gus - it took a bit of thinking for me to realise that I needed to provide all those env vars in the
proclistpackage and not my nerves project directly. Also because I’m targeting x86_64 I needed to add--codegen target-feature=-crt-statictoRUSTFLAGS. The final result is here for those who searched this up.