1 files changed, 21 insertions, 5 deletions

diff --git a/build.rs b/build.rs
index 587e058..978141a 100644
--- a/build.rs
+++ b/build.rs
@@ -15,10 +15,11 @@
 use std::env;
 
 include!("no_atomic.rs");
+include!("build-common.rs");
 
 fn main() {
     let target = match env::var("TARGET") {
-        Ok(target) => target,
+        Ok(target) => convert_custom_linux_target(target),
         Err(e) => {
             println!(
                 "cargo:warning={}: unable to get TARGET environment variable: {}",
@@ -29,13 +30,28 @@ fn main() {
         }
     };
 
-    // 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.
+    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");
 }