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