build.rs

fn main() {
    // Ensure that only a single chip is specified
    let chip_features = [
        cfg!(feature = "esp32"),
        cfg!(feature = "esp32c2"),
        cfg!(feature = "esp32c3"),
        cfg!(feature = "esp32c6"),
        cfg!(feature = "esp32h2"),
        cfg!(feature = "esp32p4"),
        cfg!(feature = "esp32s2"),
        cfg!(feature = "esp32s3"),
    ];

    match chip_features.iter().filter(|&&f| f).count() {
        1 => {}
        n => panic!("Exactly 1 chip must be enabled via its Cargo feature, {n} provided"),
    };

    // Ensure that only a single communication method is specified
    let method_features = [cfg!(feature = "uart"), cfg!(feature = "jtag-serial")];

    match method_features.iter().filter(|&&f| f).count() {
        1 => {}
        n => panic!(
            "Exactly 1 communication method must be enabled via its Cargo feature, {n} provided"
        ),
    }

    // Ensure that, if the `jtag-serial` communication method feature is enabled,
    // either the `esp32c3`, `esp32c6`, `esp32h2`, or `esp32s3` chip feature is
    // enabled.
    if cfg!(feature = "jtag-serial")
        && !(cfg!(feature = "esp32c3")
            || cfg!(feature = "esp32c6")
            || cfg!(feature = "esp32h2")
            || cfg!(feature = "esp32p4")
            || cfg!(feature = "esp32s3"))
    {
        panic!(
            "The `jtag-serial` feature is only supported by the ESP32-C3, ESP32-C6, ESP32-H2, and ESP32-S3"
        );
    }

    // Ensure that, if the `colors` is used with `log`.`
    if cfg!(feature = "colors") && !cfg!(feature = "log") {
        println!(
            "cargo:warning=The `colors` feature is only effective when using the `log` feature"
        );
    }
}