portable-atomic 0.3.20

Portable atomic types including support for 128-bit atomics, atomic float, etc.
Documentation 
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// The rustc-cfg emitted by the build script are *not* public API.

#![warn(rust_2018_idioms, single_use_lifetimes)]

mod version;
use version::{rustc_version, Version};

fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed=version.rs");

    let version = match rustc_version() {
        Some(version) => version,
        None => {
            println!(
                "cargo:warning={}: unable to determine rustc version; assuming latest stable rustc (1.{})",
                env!("CARGO_PKG_NAME"),
                Version::LATEST.minor
            );
            Version::LATEST
        }
    };

    // Note that this is `no_`*, not `has_*`. This allows treating as the latest
    // stable rustc is used when the build script doesn't run. This is useful
    // for non-cargo build systems that don't run the build script.
    // track_caller stabilized in Rust 1.46 (nightly-2020-07-02): https://github.com/rust-lang/rust/pull/72445
    if !version.probe(46, 2020, 7, 1) {
        println!("cargo:rustc-cfg=portable_atomic_no_track_caller");
    }
}