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-rw-r--r--build.rs29
1 files changed, 25 insertions, 4 deletions
diff --git a/build.rs b/build.rs
index 9c924ad..a7557fd 100644
--- a/build.rs
+++ b/build.rs
@@ -1,12 +1,33 @@
+// 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.
+//
+// - `crossbeam_no_atomic`
+// Assume the target does *not* support any atomic 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.
+//
+// - `crossbeam_no_atomic_64`
+// Assume the target does *not* support AtomicU64/AtomicI64.
+// 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");
-// The rustc-cfg strings below are *not* public API. Please let us know by
-// opening a GitHub issue if your build environment requires some way to enable
-// these cfgs other than by executing our build script.
fn main() {
let target = match env::var("TARGET") {
Ok(target) => target,
@@ -33,7 +54,7 @@ fn main() {
} else if NO_ATOMIC_64.contains(&&*target) {
println!("cargo:rustc-cfg=crossbeam_no_atomic_64");
} else {
- // Otherwise, assuming `"max-atomic-width" == 64`.
+ // Otherwise, assuming `"max-atomic-width" == 64` or `"max-atomic-width" == 128`.
}
println!("cargo:rerun-if-changed=no_atomic.rs");