138 lines
4.3 KiB
Rust
138 lines
4.3 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::io::Read;
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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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let new_backend_isas = if env::var("CARGO_FEATURE_X64").is_ok() {
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// The x64 (new backend for x86_64) is a bit particular: it only requires generating
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// the shared meta code; the only ISA-specific code is for settings.
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vec![meta::isa::Isa::X86]
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} else {
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Vec::new()
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};
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// Configure isa targets using the old backend.
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let isa_targets = meta::isa::Isa::all()
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.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 old_backend_isas = if new_backend_isas.is_empty() && 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-UTF-8 bytes).
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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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if let Err(err) = meta::generate(&old_backend_isas, &new_backend_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 env::var("CRANELIFT_VERBOSE").is_ok() {
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for isa in &old_backend_isas {
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println!(
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"cargo:warning=Includes old-backend support for {} ISA",
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isa.to_string()
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);
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}
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for isa in &new_backend_isas {
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println!(
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"cargo:warning=Includes new-backend support for {} ISA",
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isa.to_string()
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);
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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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#[cfg(feature = "rebuild-peephole-optimizers")]
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{
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std::fs::write(
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std::path::Path::new(&out_dir).join("CRANELIFT_CODEGEN_PATH"),
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cur_dir.to_str().unwrap(),
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)
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.unwrap()
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}
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let pkg_version = env::var("CARGO_PKG_VERSION").unwrap();
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let mut cmd = std::process::Command::new("git");
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cmd.arg("rev-parse")
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.arg("HEAD")
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.stdout(std::process::Stdio::piped())
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.current_dir(env::var("CARGO_MANIFEST_DIR").unwrap());
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let version = if let Ok(mut child) = cmd.spawn() {
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let mut git_rev = String::new();
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child
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.stdout
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.as_mut()
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.unwrap()
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.read_to_string(&mut git_rev)
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.unwrap();
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let status = child.wait().unwrap();
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if status.success() {
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let git_rev = git_rev.trim().chars().take(9).collect::<String>();
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format!("{}-{}", pkg_version, git_rev)
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} else {
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// not a git repo
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pkg_version
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}
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} else {
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// git not available
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pkg_version
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};
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std::fs::write(
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std::path::Path::new(&out_dir).join("version.rs"),
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format!(
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"/// Version number of this crate. \n\
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pub const VERSION: &str = \"{}\";",
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version
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),
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)
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.unwrap();
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}
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