use cranelift_codegen_meta as meta;
use std::env;
use std::process;
use std::time::Instant;
fn main() {
let start_time = Instant::now();
let out_dir = env::var("OUT_DIR").expect("The OUT_DIR environment variable must be set");
let target_triple = env::var("TARGET").expect("The TARGET environment variable must be set");
let isa_targets = meta::isa::Isa::all()
.into_iter()
.cloned()
.filter(|isa| {
let env_key = format!("CARGO_FEATURE_{}", isa.to_string().to_uppercase());
env::var(env_key).is_ok()
})
.collect::<Vec<_>>();
let isas = if isa_targets.is_empty() {
let target_name = target_triple.split('-').next().unwrap();
let isa = meta::isa_from_arch(&target_name).expect("error when identifying target");
println!("cargo:rustc-cfg=feature=\"{}\"", isa);
vec![isa]
} else {
isa_targets
};
let cur_dir = env::current_dir().expect("Can't access current working directory");
let crate_dir = cur_dir.as_path();
println!(
"cargo:rerun-if-changed={}",
crate_dir.join("build.rs").to_str().unwrap()
);
let meta_dir = crate_dir.join("meta-python");
let build_script = meta_dir.join("build.py");
let python = identify_python();
let status = process::Command::new(python)
.current_dir(crate_dir)
.arg("-B")
.arg(build_script)
.arg("--out-dir")
.arg(out_dir.clone())
.status()
.expect("Failed to launch second-level build script; is python installed?");
if !status.success() {
process::exit(status.code().unwrap());
}
if let Err(err) = meta::generate(&isas, &out_dir) {
eprintln!("Error: {}", err);
process::exit(1);
}
if let Ok(_) = env::var("CRANELIFT_VERBOSE") {
for isa in &isas {
println!("cargo:warning=Includes support for {} ISA", isa.to_string());
}
println!(
"cargo:warning=Build step took {:?}.",
Instant::now() - start_time
);
println!("cargo:warning=Generated files are in {}", out_dir);
}
}
fn identify_python() -> &'static str {
for python in &["python", "python3", "python2.7"] {
if process::Command::new(python)
.arg("--version")
.status()
.is_ok()
{
return python;
}
}
panic!("The Cranelift build requires Python (version 2.7 or version 3)");
}