/hifive-nom-example

Primary LanguageRust

Example Project hifive revb board setup

Setup

From http://osblog.stephenmarz.com/ch0.html

  1. rustup override set nightly in directory
  2. rustup target add riscv32imac-unknown-none-elf

Fixing nom memchr std lib error:

See rust-bakery/nom#1457

Essentally the fix involves updating a project to edition 2021

Running

This example project is to demonstrate a std conflict with memchr, a dependency of the nom crate.

Run cargo build as-is (with nom turned on in Cargo.toml) to show

   Compiling memchr v2.4.1
error[E0463]: can't find crate for `std`
  |
  = note: the `riscv32imac-unknown-none-elf` target may not support the standard library
  = note: `std` is required by `memchr` because it does not declare `#![no_std]`
  = help: consider building the standard library from source with `cargo build -Zbuild-std`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: could not compile `memchr`

Now comment out:

[dependencies.nom]

# version = "7.0.0"

git = "https://github.com/Geal/nom"

default-features = false

features = []

in Cargo.toml

Running cargo build now will be successful.