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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.
use std::{
env, fs,
path::{Path, PathBuf},
process::Command,
};
use cargo_metadata::Message;
fn main() {
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 target_dir = out_dir.join("target");
let output = Command::new(toolchain::cargo())
.current_dir("imp")
.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)
.output()
.unwrap();
assert!(output.status.success());
let mut artifact_path = None;
for message in Message::parse_stream(output.stdout.as_slice()) {
match message.unwrap() {
Message::CompilerArtifact(artifact) => {
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]));
}
}
}
_ => (), // Unknown message
}
}
// 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();
}
|
