imxrt-boot-gen 0.1.0

Generate data structures for booting iMXRT processors. Usable in Rust build scripts.
Documentation 
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//! The build script requires that a user has provided a valid
//! feature flag. If they provide too many feature flags, we fail.

use std::env;

// Keep this in sync with the available features
static SUPPORTED_FEATURES: &[&str] = &["imxrt1011", "imxrt1061", "imxrt1062", "imxrt1064"];

fn main() {
    let feature_count = SUPPORTED_FEATURES
        .iter()
        .cloned()
        .map(str::to_uppercase)
        .map(|feature| format!("CARGO_FEATURE_{}", feature))
        .map(|cargo_feature| env::var(cargo_feature).is_ok() as i32)
        .sum();

    if 0 == feature_count {
        panic!(
            "No feature selected! Available features: {}",
            SUPPORTED_FEATURES.join(" | ")
        );
    } else if feature_count > 1 {
        panic!(
            "Too many features selected! Select one feature from the feature list: {}",
            SUPPORTED_FEATURES.join(" | ")
        );
    }
}