use lld for faster link times

package.nix

@@ -7,14 +7,23 @@
   clangStdenv,
   callPackage,
   linkFarm,
+  llvmPackages,
   rustHooks,
   rustPackages,
   versionCheckHook,
+  wrapBintoolsWith,
 }: lib.callWith' rustPackages ({
   rustPlatform,
   cargo,
 }: let
-  stdenv = clangStdenv;
+  # Use LLD for faster link times.
+  stdenv = clangStdenv.override {
+    cc = clangStdenv.cc.override {
+      bintools = wrapBintoolsWith {
+        bintools = llvmPackages.bintools;
+      };
+    };
+  };
   cargoToml = lib.importTOML ./Cargo.toml;
   cargoPackage = cargoToml.package;
 in stdenv.mkDerivation (finalAttrs: let