extern crate cc;
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
fn main() {
let target = env::var("TARGET").unwrap();
has_fpu(&target);
let is_armv6m = is_armv6m(&target);
if target.starts_with("thumbv") {
cc::Build::new().file("asm.s").compile("asm");
}
let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
let link_x = include_bytes!("link.x.in");
let mut f = if env::var_os("CARGO_FEATURE_DEVICE").is_some() {
let mut f = File::create(out.join("link.x")).unwrap();
writeln!(
f,
r#"
/* Provides weak aliases (cf. PROVIDED) for device specific interrupt handlers */
/* This will usually be provided by a device crate generated using svd2rust (see `device.x`) */
INCLUDE device.x"#
).unwrap();
f.write_all(link_x).unwrap();
f
} else {
let mut f = File::create(out.join("link.x")).unwrap();
f.write_all(link_x).unwrap();
f
};
let max_int_handlers = if is_armv6m { 32 } else { 240 };
writeln!(
f,
r#"
ASSERT(__einterrupts - __eexceptions <= 0x{:x}, "
There can't be more than {} interrupt handlers. This may be a bug in
your device crate, or you may have registered more than 240 interrupt
handlers.");
"#,
max_int_handlers * 4,
max_int_handlers
).unwrap();
println!("cargo:rustc-link-search={}", out.display());
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-changed=link.x");
}
fn has_fpu(target: &str) {
if target.ends_with("eabihf") {
println!("cargo:rustc-cfg=has_fpu");
}
}
fn is_armv6m(target: &str) -> bool {
if target.starts_with("thumbv6m-") {
println!("cargo:rustc-cfg=armv6m");
true
} else {
false
}
}