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Fix rustc-args passing issue in bootstrap #113948

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Jul 22, 2023
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Fix rustc-args passing issue in bootstrap #113948

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7 changes: 7 additions & 0 deletions src/bootstrap/builder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2043,6 +2043,13 @@ impl<'a> Builder<'a> {
rustflags.arg("-Zinline-mir");
}

// set rustc args passed from command line
let rustc_args =
self.config.cmd.rustc_args().iter().map(|s| s.to_string()).collect::<Vec<_>>();
if !rustc_args.is_empty() {
cargo.env("RUSTFLAGS", &rustc_args.join(" "));
}
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I don't understand this patch, it doesn't make sense to me. This is setting the RUSTFLAGS env var, but when this Cargo instance is later turned into a Command, the RUSTFLAGS env var is anyway overwritten again:

rust/src/bootstrap/src/core/builder.rs

Lines 2414 to 2418 in c350d3c

fn from(mut cargo: Cargo) -> Command {
let rustflags = &cargo.rustflags.0;
if !rustflags.is_empty() {
cargo.command.env("RUSTFLAGS", rustflags);
}

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Shouldn't this be added to rustflags instead?

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Also the --help text says this should only be passed when running tests; I don't see that reflected in the code.

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Yeah, this isn't correct and fixed in #123489.


Cargo { command: cargo, rustflags, rustdocflags, allow_features }
}

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