}
}
+ // Cargo doesn't pass RUSTFLAGS to proc_macros:
+ // https://github.com/rust-lang/cargo/issues/4423
+ // Thus, if we are on stage 0, we explicitly set `--cfg=bootstrap`.
+ // We also declare that the flag is expected, which is mainly needed for
+ // later stages so that they don't warn about #[cfg(bootstrap)],
+ // but enabling it for stage 0 too lets any warnings, if they occur,
+ // occur more early on, e.g. about #[cfg(bootstrap = "foo")].
if stage == "0" {
- // Cargo doesn't pass RUSTFLAGS to proc_macros:
- // https://github.com/rust-lang/cargo/issues/4423
- // Set `--cfg=bootstrap` explicitly instead.
cmd.arg("--cfg=bootstrap");
}
+ cmd.arg("-Zunstable-options");
+ cmd.arg("--check-cfg=values(bootstrap)");
}
if let Ok(map) = env::var("RUSTC_DEBUGINFO_MAP") {