buildRustCrate: use $NIX_BUILD_CORES for each of the crates

1 files changed, 1 insertions, 1 deletions

diff --git a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
index b184d363d55..165b3414c6a 100644
--- a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
+++ b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
@@ -22,7 +22,7 @@ let version_ = lib.splitString "-" crateVersion;
     version = lib.splitString "." (lib.head version_);
     rustcOpts = lib.lists.foldl' (opts: opt: opts + " " + opt)
         (if release then "-C opt-level=3" else "-C debuginfo=2")
-        (["-C codegen-units=1"] ++ extraRustcOpts);
+        (["-C codegen-units=$NIX_BUILD_CORES"] ++ extraRustcOpts);
     buildDeps = makeDeps buildDependencies;
     authors = lib.concatStringsSep ":" crateAuthors;
     optLevel = if release then 3 else 0;