Add workaround for sporadic kills when building on Macos

Author: charlesroussel

crates/cargo-util/src/paths.rs

@@ -539,7 +539,18 @@ fn _link_or_copy(src: &Path, dst: &Path) -> Result<()> {
         // gory details.
         fs::copy(src, dst).map(|_| ())
     } else {
-        fs::hard_link(src, dst)
+        if cfg!(target_os = "macos") {
+            // This is a work-around for a bug on macos. There seems to be a race condition
+            // with APFS when hard-linking binaries. Gatekeeper does not have signing or
+            // hash informations stored in kernel when running the process. Therefore killing it.
+            // This problem does not appear when copying files as kernel has time to process it.
+            // Note that: fs::copy on macos is using CopyOnWrite (syscall fclonefileat) which should be
+            // as fast as hardlinking.
+            // See https://github.com/rust-lang/cargo/issues/10060 for the details
+            fs::copy(src, dst).map(|_| ())
+        } else {
+            fs::hard_link(src, dst)
+        }
     };
     link_result
         .or_else(|err| {