115 lines
3.7 KiB
Rust
115 lines
3.7 KiB
Rust
// Build script.
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//
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// This program is run by Cargo when building cranelift-codegen. It is used to generate Rust code from
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// the language definitions in the cranelift-codegen/meta directory.
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//
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// Environment:
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//
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// OUT_DIR
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// Directory where generated files should be placed.
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//
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// TARGET
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// Target triple provided by Cargo.
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//
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// The build script expects to be run from the directory where this build.rs file lives. The
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// current directory is used to find the sources.
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use cranelift_codegen_meta as meta;
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use std::env;
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use std::process;
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use std::time::Instant;
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fn main() {
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let start_time = Instant::now();
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let out_dir = env::var("OUT_DIR").expect("The OUT_DIR environment variable must be set");
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let target_triple = env::var("TARGET").expect("The TARGET environment variable must be set");
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// Configure isa targets cfg.
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let isa_targets = meta::isa::Isa::all()
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.into_iter()
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.cloned()
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.filter(|isa| {
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let env_key = format!("CARGO_FEATURE_{}", isa.to_string().to_uppercase());
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env::var(env_key).is_ok()
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})
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.collect::<Vec<_>>();
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let isas = if isa_targets.is_empty() {
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// Try to match native target.
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let target_name = target_triple.split('-').next().unwrap();
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let isa = meta::isa_from_arch(&target_name).expect("error when identifying target");
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println!("cargo:rustc-cfg=feature=\"{}\"", isa);
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vec![isa]
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} else {
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isa_targets
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};
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let cur_dir = env::current_dir().expect("Can't access current working directory");
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let crate_dir = cur_dir.as_path();
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// Make sure we rebuild if this build script changes (will not happen with
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// if the path to this file contains non-UTF8 bytes). The `build.py` script
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// prints out its own dependencies.
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println!(
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"cargo:rerun-if-changed={}",
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crate_dir.join("build.rs").to_str().unwrap()
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);
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// Scripts are in `$crate_dir/meta-python`.
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let meta_dir = crate_dir.join("meta-python");
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let build_script = meta_dir.join("build.py");
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// Launch build script with Python. We'll just find python in the path.
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// Use -B to disable .pyc files, because they cause trouble for vendoring
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// scripts, and this is a build step that isn't run very often anyway.
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let python = identify_python();
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let status = process::Command::new(python)
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.current_dir(crate_dir)
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.arg("-B")
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.arg(build_script)
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.arg("--out-dir")
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.arg(out_dir.clone())
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.status()
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.expect("Failed to launch second-level build script; is python installed?");
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if !status.success() {
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process::exit(status.code().unwrap());
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}
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// DEVELOPMENT:
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// ------------------------------------------------------------------------
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// Now that the Python build process is complete, generate files that are
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// emitted by the `meta` crate.
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// ------------------------------------------------------------------------
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if let Err(err) = meta::generate(&isas, &out_dir) {
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eprintln!("Error: {}", err);
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process::exit(1);
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}
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if let Ok(_) = env::var("CRANELIFT_VERBOSE") {
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for isa in &isas {
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println!("cargo:warning=Includes support for {} ISA", isa.to_string());
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}
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println!(
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"cargo:warning=Build step took {:?}.",
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Instant::now() - start_time
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);
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println!("cargo:warning=Generated files are in {}", out_dir);
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}
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}
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fn identify_python() -> &'static str {
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for python in &["python", "python3", "python2.7"] {
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if process::Command::new(python)
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.arg("--version")
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.status()
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.is_ok()
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{
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return python;
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}
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}
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panic!("The Cranelift build requires Python (version 2.7 or version 3)");
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}
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