build.rs

//! This build script copies the `memory.x` file from the crate root into
//! a directory where the linker can always find it at build time.
//! For many projects this is optional, as the linker always searches the
//! project root directory -- wherever `Cargo.toml` is. However, if you
//! are using a workspace or have a more complicated build setup, this
//! build script becomes required. Additionally, by requesting that
//! Cargo re-run the build script whenever `memory.x` is changed,
//! updating `memory.x` ensures a rebuild of the application with the
//! new memory settings.

use std::{env, fs::File, io::Write, path::PathBuf};
extern crate prost_build;

// fn main() {
//     // Put `memory.x` in our output directory and ensure it's
//     // on the linker search path.
// let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
// File::create(out.join("memory.x"))
//     .unwrap()
//     .write_all(include_bytes!("memory.x"))
//     .unwrap();
// println!("cargo:rustc-link-search={}", out.display());

// By default, Cargo will re-run a build script whenever
// any file in the project changes. By specifying `memory.x`
// here, we ensure the build script is only re-run when
// `memory.x` is changed.
// println!("cargo:rerun-if-changed=memory.x");
// }

fn main() {
    println!("cargo:rustc-link-arg-bins=--nmagic");
    println!("cargo:rustc-link-arg-bins=-Tlink.x");

    // TODO FIXME: why does conditionally linking this become a huge pain
    // #[cfg(feature = "defmt_log")]
    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");

    println!("cargo:rerun-if-changed=memory.x");
    println!("cargo:rerun-if-changed=otomo-protobuf/otomo.proto");

    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
    File::create(out.join("memory.x"))
        .unwrap()
        .write_all(include_bytes!("memory.x"))
        .unwrap();
    println!("cargo:rustc-link-search={}", out.display());

    let mut config = prost_build::Config::new();
    config.btree_map(["."]);
    config
        .compile_protos(&["otomo.proto"], &["otomo-protobuf"])
        .unwrap();
}