build.rs

/***************************************************************************************************
 * Copyright (c) 2019 by the authors
 *
 * Author: André Borrmann
 * License: Apache License 2.0
 **************************************************************************************************/
//! Build script to pre-compile the assembly files containing the majority of the bootstrap code
//! and some initial configuration required before rust code could pick up processing
//!

extern crate cc;
use std::env;

fn main() {
  let script_location = env::current_dir().unwrap();

  if let Some(target_arch) = env::var_os("CARGO_CFG_TARGET_ARCH") {
    if target_arch == "aarch64" && env::var("DOCS_RS").is_err() {
      cc::Build::new()
        .file("src/asm/aarch64/bootstrap.S")
        .flag("-march=armv8-a")
        .compile("bootstrap");
      cc::Build::new()
        .file("src/asm/aarch64/exceptionvector.S")
        .flag("-march=armv8-a")
        .compile("excvector");
      // print the linker file location of the boot crate to the env-variables
      println!("cargo:linkerscript={}/link64.ld", script_location.display());

      println!("cargo:rerun-if-changed=link64.ld");
      println!("cargo:rerun-if-changed=src/asm/aarch64/bootstrap.S");
      println!("cargo:rerun-if-changed=src/asm/aarch64/exceptionvector.S");
    }
  }
}