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Add PROC_MACRO_TEST_TOOLCHAIN environment variable #12834

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Merged
merged 1 commit into from
Jul 20, 2022
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Add PROC_MACRO_TEST_TOOLCHAIN environment variable #12834

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17 changes: 16 additions & 1 deletion crates/proc-macro-test/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,10 @@
//! `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,
Expand All @@ -13,6 +17,7 @@ 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);
Expand Down Expand Up @@ -47,7 +52,17 @@ fn main() {
}

let target_dir = out_dir.join("target");
let output = Command::new(toolchain::cargo())

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())
};

let output = 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
Expand Down