106 lines
3.8 KiB
Rust
106 lines
3.8 KiB
Rust
//! This will build the proc macro in `imp`, and copy the resulting dylib artifact into the
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//! `OUT_DIR`.
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//!
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//! `proc-macro-test` itself contains only a path to that artifact.
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//!
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//! The `PROC_MACRO_TEST_TOOLCHAIN` environment variable can be exported to use
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//! a specific rustup toolchain: this allows testing against older ABIs (e.g.
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//! 1.58) and future ABIs (stage1, nightly)
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use std::{
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env, fs,
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path::{Path, PathBuf},
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process::Command,
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};
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use cargo_metadata::Message;
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fn main() {
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println!("cargo:rerun-if-changed=imp");
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println!("cargo:rerun-if-env-changed=PROC_MACRO_TEST_TOOLCHAIN");
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let out_dir = env::var_os("OUT_DIR").unwrap();
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let out_dir = Path::new(&out_dir);
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let name = "proc-macro-test-impl";
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let version = "0.0.0";
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let imp_dir = std::env::current_dir().unwrap().join("imp");
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let staging_dir = out_dir.join("proc-macro-test-imp-staging");
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// this'll error out if the staging dir didn't previously exist. using
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// `std::fs::exists` would suffer from TOCTOU so just do our best to
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// wipe it and ignore errors.
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let _ = std::fs::remove_dir_all(&staging_dir);
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println!("Creating {}", staging_dir.display());
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std::fs::create_dir_all(&staging_dir).unwrap();
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let src_dir = staging_dir.join("src");
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println!("Creating {}", src_dir.display());
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std::fs::create_dir_all(src_dir).unwrap();
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for item_els in [&["Cargo.toml"][..], &["src", "lib.rs"]] {
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let mut src = imp_dir.clone();
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let mut dst = staging_dir.clone();
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for el in item_els {
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src.push(el);
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dst.push(el);
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}
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println!("Copying {} to {}", src.display(), dst.display());
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std::fs::copy(src, dst).unwrap();
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}
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let target_dir = out_dir.join("target");
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let mut cmd = if let Ok(toolchain) = std::env::var("PROC_MACRO_TEST_TOOLCHAIN") {
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// leverage rustup to find user-specific toolchain
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let mut cmd = Command::new("cargo");
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cmd.arg(format!("+{toolchain}"));
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cmd
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} else {
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Command::new(toolchain::cargo())
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};
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let output = cmd
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.current_dir(&staging_dir)
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.args(&["build", "-p", "proc-macro-test-impl", "--message-format", "json"])
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// Explicit override the target directory to avoid using the same one which the parent
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// cargo is using, or we'll deadlock.
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// This can happen when `CARGO_TARGET_DIR` is set or global config forces all cargo
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// instance to use the same target directory.
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.arg("--target-dir")
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.arg(&target_dir)
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.output()
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.unwrap();
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if !output.status.success() {
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println!("proc-macro-test-impl failed to build");
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println!("============ stdout ============");
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println!("{}", String::from_utf8_lossy(&output.stdout));
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println!("============ stderr ============");
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println!("{}", String::from_utf8_lossy(&output.stderr));
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panic!("proc-macro-test-impl failed to build");
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}
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let mut artifact_path = None;
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for message in Message::parse_stream(output.stdout.as_slice()) {
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match message.unwrap() {
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Message::CompilerArtifact(artifact) => {
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if artifact.target.kind.contains(&"proc-macro".to_string()) {
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let repr = format!("{} {}", name, version);
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if artifact.package_id.repr.starts_with(&repr) {
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artifact_path = Some(PathBuf::from(&artifact.filenames[0]));
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}
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}
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}
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_ => (), // Unknown message
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}
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}
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// This file is under `target_dir` and is already under `OUT_DIR`.
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let artifact_path = artifact_path.expect("no dylib for proc-macro-test-impl found");
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let info_path = out_dir.join("proc_macro_test_location.txt");
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fs::write(info_path, artifact_path.to_str().unwrap()).unwrap();
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}
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