Vendor things

third-party/vendor/valuable/build.rs

@@ -0,0 +1,39 @@
+#![warn(rust_2018_idioms, single_use_lifetimes)]
+
+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,
+        Err(e) => {
+            println!(
+                "cargo:warning=valuable: unable to get TARGET environment variable: {}",
+                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=valuable_no_atomic_cas");
+    }
+    if NO_ATOMIC.contains(&&*target) {
+        println!("cargo:rustc-cfg=valuable_no_atomic");
+        println!("cargo:rustc-cfg=valuable_no_atomic_64");
+    } else if NO_ATOMIC_64.contains(&&*target) {
+        println!("cargo:rustc-cfg=valuable_no_atomic_64");
+    } else {
+        // Otherwise, assuming `"max-atomic-width" == 64`.
+    }
+
+    println!("cargo:rerun-if-changed=no_atomic.rs");
+}