Upgrade rust/crates/futures-channel to 0.3.15
Test: make
Change-Id: I09aa640ae00a1055141833a6ff497d4dab47fc97
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..c4f341d
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,42 @@
+#![warn(rust_2018_idioms, single_use_lifetimes)]
+
+use std::env;
+
+include!("no_atomic_cas.rs");
+
+// The rustc-cfg listed below are considered public API, but it is *unstable*
+// and outside of the normal semver guarantees:
+//
+// - `futures_no_atomic_cas`
+// Assume the target does not have atomic CAS (compare-and-swap).
+// 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 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,
+ Err(e) => {
+ println!(
+ "cargo:warning={}: unable to get TARGET environment variable: {}",
+ 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_TARGETS.contains(&&*target) {
+ println!("cargo:rustc-cfg=futures_no_atomic_cas");
+ }
+
+ println!("cargo:rerun-if-changed=no_atomic_cas.rs");
+}