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23 lines
672 B
23 lines
672 B
7 months ago
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use autocfg::AutoCfg;
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fn main() {
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match AutoCfg::new() {
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Ok(ac) => {
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// The #[track_caller] attribute was stabilized in rustc 1.46.0.
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if ac.probe_rustc_version(1, 46) {
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autocfg::emit("tokio_track_caller")
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}
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}
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Err(e) => {
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// If we couldn't detect the compiler version and features, just
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// print a warning. This isn't a fatal error: we can still build
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// Tokio, we just can't enable cfgs automatically.
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println!(
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"cargo:warning=tokio: failed to detect compiler features: {}",
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e
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);
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}
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}
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}
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