Allow compilation to wasm32-wasi target

[rahul-thakoor]

Hello!

I have a use case where I would like to use a subset of the functionality of rust-sysfs-gpio. I am compiling a was--compatible module that can access gpio pins via a webassembly runtime.

[proohit]

Hi, I've stumbled over this issue. Is there any news on GPIO via WASI? Afaik, WASI doesn't include hardware abstractions for peripherals, but that knowledge may be old :).

[nastevens]

Closing as @posborne's statement from gpio-cdev applies here as well

This crate is very much so only intended to target Linux and wasm/wasi is not that. I think a more interesting approach in general would for there to be some project which seeks to provide an implementation of the https://github.com/rust-embedded/embedded-hal traits that could execute within an environment like wasm32-wasi which would proxy requests through some mechanism to an implementation in the host environment. At least, that's my intuition while not having extensive experience with wasm. This would seem to be much more well suited to implementing things portably and securely across platforms which is one of the reasons that people often are deciding to target wasm.