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