File: build.rs

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rustc 1.70.0%2Bdfsg1-9
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use std::env;

fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    let opt_level = env::var("OPT_LEVEL")
        .ok()
        .and_then(|s| s.parse().ok())
        .unwrap_or(0);
    let profile = env::var("PROFILE").unwrap_or_default();
    if profile == "release" || opt_level >= 2 {
        println!("cargo:rustc-cfg=optimized");
    }
}