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12 changes: 12 additions & 0 deletions src/bootstrap/builder.rs
Original file line number Diff line number Diff line change
Expand Up @@ -469,6 +469,18 @@ impl<'a> Builder<'a> {
stage = compiler.stage;
}

let mut extra_args = env::var(&format!("RUSTFLAGS_STAGE_{}", stage)).unwrap_or_default();
if stage != 0 {
let s = env::var("RUSTFLAGS_STAGE_NOT_0").unwrap_or_default();
extra_args.push_str(" ");
extra_args.push_str(&s);
}

if !extra_args.is_empty() {
cargo.env("RUSTFLAGS",
format!("{} {}", env::var("RUSTFLAGS").unwrap_or_default(), extra_args));
}

// Customize the compiler we're running. Specify the compiler to cargo
// as our shim and then pass it some various options used to configure
// how the actual compiler itself is called.
Expand Down