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Disable RUSTC_BOOTSTRAP in build.rs #8667

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Disable RUSTC_BOOTSTRAP in build.rs #8667

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7 changes: 7 additions & 0 deletions src/cargo/core/compiler/custom_build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -607,6 +607,13 @@ impl BuildOutput {
let mut iter = value.splitn(2, '=');
let name = iter.next();
let val = iter.next();
if name.unwrap_or("").eq_ignore_ascii_case("RUSTC_BOOTSTRAP") {
if crate::core::features::nightly_features_allowed() {
log::warn!("RUSTC_BOOTSTRAP is not supported in build script overrides");
} else {
anyhow::bail!("RUSTC_BOOTSTRAP is not supported in build script overrides");
}
}
match (name, val) {
(Some(n), Some(v)) => Ok((n.to_owned(), v.to_owned())),
_ => anyhow::bail!("Variable rustc-env has no value in {}: {}", whence, value),
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