Function main

cranelift/codegen/build.rs:26–136

()

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 out_dir = std::path::Path::new(&out_dir);
    let target_triple = env::var("TARGET").expect("The TARGET environment variable must be set");

    let all_arch = env::var("CARGO_FEATURE_ALL_ARCH").is_ok();
    let all_native_arch = env::var("CARGO_FEATURE_ALL_NATIVE_ARCH").is_ok();

    let mut isas = meta::isa::Isa::all()
        .iter()
        .cloned()
        .filter(|isa| {
            let env_key = match isa {
                meta::isa::Isa::Pulley32 | meta::isa::Isa::Pulley64 => {
                    "CARGO_FEATURE_PULLEY".to_string()
                }
                _ => format!("CARGO_FEATURE_{}", isa.to_string().to_uppercase()),
            };
            all_arch || env::var(env_key).is_ok()
        })
        .collect::<Vec<_>>();

    // Don't require host isa if under 'all-arch' feature.
    let host_isa = env::var("CARGO_FEATURE_HOST_ARCH").is_ok() && !all_native_arch;

    if isas.is_empty() || host_isa {
        // Try to match native target.
        let target_name = target_triple.split('-').next().unwrap();
        if let Ok(isa) = meta::isa_from_arch(&target_name) {
            println!("cargo:rustc-cfg=feature=\"{isa}\"");
            isas.push(isa);
        }
    }

    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=build.rs");
    println!("cargo:rerun-if-env-changed=ISLE_SOURCE_DIR");

    let isle_dir = if let Ok(path) = std::env::var("ISLE_SOURCE_DIR") {
        // This will canonicalize any relative path in terms of the
        // crate root, and will take any absolute path as overriding the
        // `crate_dir`.
        crate_dir.join(&path)
    } else {
        out_dir.into()
    };

    std::fs::create_dir_all(&isle_dir).expect("Could not create ISLE source directory");

    if let Err(err) = meta::generate(&isas, &out_dir, &isle_dir) {
        eprintln!("Error: {err}");
        process::exit(1);
    }