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Only pass -Zincremental to nightly rustc. #4000

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May 7, 2017
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Only pass -Zincremental to nightly rustc. #4000

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8 changes: 8 additions & 0 deletions src/cargo/ops/cargo_rustc/context.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,14 @@ impl<'a, 'cfg> Context<'a, 'cfg> {
Err(_) => false,
};

// -Z can only be used on nightly builds; other builds complain loudly.
// Since incremental builds only work on nightly anyway, we silently
// ignore CARGO_INCREMENTAL on anything but nightly. This allows users
// to always have CARGO_INCREMENTAL set without getting unexpected
// errors on stable/beta builds.
let incremental_enabled = incremental_enabled
&& config.rustc()?.verbose_version.contains("nightly");

Ok(Context {
ws: ws,
host: host_layout,
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