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-rw-r--r--third_party/rust/crossbeam-epoch/build.rs57
1 files changed, 57 insertions, 0 deletions
diff --git a/third_party/rust/crossbeam-epoch/build.rs b/third_party/rust/crossbeam-epoch/build.rs
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+++ b/third_party/rust/crossbeam-epoch/build.rs
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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");
+include!("build-common.rs");
+
+fn main() {
+ let target = match env::var("TARGET") {
+ Ok(target) => convert_custom_linux_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 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.
+ if NO_ATOMIC_CAS.contains(&&*target) {
+ println!("cargo:rustc-cfg=crossbeam_no_atomic_cas");
+ }
+
+ if !cfg.probe_rustc_version(1, 61) {
+ println!("cargo:rustc-cfg=crossbeam_no_const_fn_trait_bound");
+ }
+
+ println!("cargo:rerun-if-changed=no_atomic.rs");
+}