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Diffstat (limited to '')
-rw-r--r-- | vendor/crossbeam-epoch/build.rs | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/vendor/crossbeam-epoch/build.rs b/vendor/crossbeam-epoch/build.rs new file mode 100644 index 000000000..bba54d999 --- /dev/null +++ b/vendor/crossbeam-epoch/build.rs @@ -0,0 +1,58 @@ +// 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"); +} |