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Improve fidelity of rustc-crates-on-stable test #133168

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Improve fidelity of rustc-crates-on-stable test #133168

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13 changes: 9 additions & 4 deletions tests/run-make/rustc-crates-on-stable/rmake.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,13 +4,18 @@
use run_make_support::{cargo, rustc_path, source_root};

fn main() {
// Use the stage0 beta cargo for the compilation (it shouldn't really matter which cargo we use)
// NOTE: in the following cargo invocation, make sure that no unstable cargo flags are used! We
// want to check that the listed compiler crates here can compile on the stable channel. We
// can't really just "ask" a stage1 cargo to pretend that it is a stable cargo, because other
// compiler crates are part of the same workspace, which necessarily requires that they can use
// unstable features and experimental editions (like edition 2024).
cargo()
// Ensure `proc-macro2`'s nightly detection is disabled
// Ensure `proc-macro2`'s nightly detection is disabled: its build script avoids using
// nightly features when `RUSTC_STAGE` is set.
.env("RUSTC_STAGE", "0")
.env("RUSTC", rustc_path())
// We want to disallow all nightly features to simulate a stable build
.env("RUSTFLAGS", "-Zallow-features=")
// This forces the underlying rustc to think it is a stable rustc.
.env("RUSTC_BOOTSTRAP", "-1")
.arg("build")
.arg("--manifest-path")
.arg(source_root().join("Cargo.toml"))
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