やはりクロス環境はDockerが簡単（失敗編）

# cat Cargo.toml
[package]
name = "led_blink"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
rppal = "0.14.0"

# cargo build
    Updating crates.io index
  Downloaded rppal v0.14.1
  Downloaded libc v0.2.147
  Downloaded 2 crates (766.8 KB) in 0.86s
   Compiling libc v0.2.147
   Compiling rppal v0.14.1
   Compiling led_blink v0.1.0 (/root/rust/led_blink)
    Finished dev [unoptimized + debuginfo] target(s) in 21.72s

$ ./led_blink
Illegal instruction

extern crate rppal;

use std::error::Error;
use std::thread;
use std::time::Duration;

use rppal::gpio::Gpio;

const GPIO_LED1: u8 = 17;
const GPIO_LED2: u8 = 27;

fn main() -> Result<(), Box> {

    let mut led1 = Gpio::new()?.get(GPIO_LED1)?.into_output();
    let mut led2 = Gpio::new()?.get(GPIO_LED2)?.into_output();

    // Blink the LED by setting the pin's logic level high for 1000 ms.
    loop{
        led2.set_high();
        led1.set_high();
        thread::sleep(Duration::from_millis(100));
        
        led1.set_low();
        led2.set_low();
        thread::sleep(Duration::from_millis(100));
    }
}