blob: dc2dbef0b7055cf9eaa70302ccd6b96cbadfa221 [file] [log] [blame]
use std::env;
use std::fs;
use std::fs::File;
use std::io::BufRead;
use std::io::BufReader;
use std::path::{Path, PathBuf};
use std::process;
static LAYOUT_FILE_NAME: &str = "layout.ld";
static LAYOUT_GENERIC_FILENAME: &str = "layout_generic.ld";
fn main() {
static PLATFORM_FILE_NAME: &str = "platform";
static APP_HEAP_SIZE: &str = "APP_HEAP_SIZE";
println!("cargo:rerun-if-env-changed={}", PLATFORM_ENV_VAR);
println!("cargo:rerun-if-env-changed={}", APP_HEAP_SIZE);
println!("cargo:rerun-if-env-changed={}", KERNEL_HEAP_SIZE);
println!("cargo:rerun-if-changed={}", PLATFORM_FILE_NAME);
println!("cargo:rerun-if-changed={}", LAYOUT_FILE_NAME);
println!("cargo:rerun-if-changed={}", LAYOUT_GENERIC_FILENAME);
let platform_name =
read_env_var(PLATFORM_ENV_VAR).or_else(|| read_board_name_from_file(PLATFORM_FILE_NAME));
if let Some(platform_name) = platform_name {
println!("cargo:rustc-env={}={}", PLATFORM_ENV_VAR, platform_name);
} else {
"cargo:warning=No platform specified. \
Remember to manually specify a linker file.",
set_default_env(APP_HEAP_SIZE, "1024");
set_default_env(KERNEL_HEAP_SIZE, "1024");
fn set_default_env(env_var: &str, default: &str) {
if let Some(s) = read_env_var(env_var) {
println!("cargo:rustc-env={}={}", env_var, s);
} else {
// Just use a default of 1024 if nothing is passed in
println!("cargo:rustc-env={}={}", env_var, default);
fn read_env_var(env_var: &str) -> Option<String> {
env::var_os(env_var).map(|os_string| os_string.into_string().unwrap())
fn read_board_name_from_file(file_name: &str) -> Option<String> {
let path = Path::new(file_name);
if !path.exists() {
return None;
let board_file = File::open(path).unwrap();
let mut board_name = String::new();
.read_line(&mut board_name)
fn copy_linker_file(platform_name: &str) {
let linker_file_name = format!("boards/layout_{}.ld", platform_name);
let path = Path::new(&linker_file_name);
if !path.exists() {
println!("Cannot find layout file {:?}", path);
// Note: cargo fails if run in a path that is not valid Unicode, so this
// script doesn't need to handle non-Unicode paths. Also, OUT_DIR cannot be
// in a location with a newline in it, or we have no way to pass
// rustc-link-search to cargo.
let out_dir = &std::env::var("OUT_DIR").expect("Unable to read OUT_DIR");
"Build path contains a newline, which is unsupported"
let out_layout_path: PathBuf = [out_dir, "layout.ld"].iter().collect();
fs::copy(linker_file_name, out_layout_path).unwrap();
// Copy the generic layout file into OUT_DIR.
let out_layout_generic: PathBuf = [out_dir, LAYOUT_GENERIC_FILENAME].iter().collect();
fs::copy(LAYOUT_GENERIC_FILENAME, out_layout_generic)
.expect("Unable to copy layout_generic.ld into OUT_DIR");
println!("cargo:rustc-link-search={}", out_dir);