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// The rustc-cfg listed below are considered public API, but it is *unstable*
// and outside of the normal semver guarantees:
//
// - `crossbeam_no_atomic_cas`
// Assume the target does *not* support atomic CAS operations.
// This is usually detected automatically by the build script, but you may
// need to enable it manually when building for custom targets or using
// non-cargo build systems that don't run the build script.
//
// With the exceptions mentioned above, the rustc-cfg emitted by the build
// script are *not* public API.
#![warn(rust_2018_idioms)]
use std::env;
include!("no_atomic.rs");
fn main() {
let target = match env::var("TARGET") {
Ok(target) => target,
Err(e) => {
println!(
"cargo:warning={}: unable to get TARGET environment variable: {}",
env!("CARGO_PKG_NAME"),
e
);
return;
}
};
let cfg = match autocfg::AutoCfg::new() {
Ok(cfg) => cfg,
Err(e) => {
println!(
"cargo:warning={}: unable to determine rustc version: {}",
env!("CARGO_PKG_NAME"),
e
);
return;
}
};
// Note that this is `no_*`, not `has_*`. This allows treating
// `cfg(target_has_atomic = "ptr")` as true when the build script doesn't
// run. This is needed for compatibility with non-cargo build systems that
// don't run the build script.
if NO_ATOMIC_CAS.contains(&&*target) {
println!("cargo:rustc-cfg=crossbeam_no_atomic_cas");
}
if cfg.probe_rustc_version(1, 61) {
// TODO: invert cfg once Rust 1.61 became stable.
println!("cargo:rustc-cfg=crossbeam_const_fn_trait_bound");
}
println!("cargo:rerun-if-changed=no_atomic.rs");
}
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