Merge pull request #185612 from obsidiansystems/buildRustCrate-21.05-no-choke-on-deporigin/release-21.05origin/nixpkgs-21.05-darwinorigin/nixos-21.05-smallorigin/nixos-21.05-aarch64origin/nixos-21.05

[Backport release 21.05] buildRustCrate: don't try to set CARGO_FEATURE_ variables for dep: fe…

1 files changed, 7 insertions, 2 deletions

diff --git a/pkgs/build-support/rust/build-rust-crate/default.nix b/pkgs/build-support/rust/build-rust-crate/default.nix
index ab6b867725f1..bc0aa36f17d5 100644
--- a/pkgs/build-support/rust/build-rust-crate/default.nix
+++ b/pkgs/build-support/rust/build-rust-crate/default.nix
@@ -257,9 +257,14 @@ stdenv.mkDerivation (rec {
 
     # Create a list of features that are enabled by the crate itself and
     # through the features argument of buildRustCrate. Exclude features
-    # with a forward slash, since they are passed through to dependencies.
+    # with a forward slash, since they are passed through to dependencies,
+    # and dep: features, since they're internal-only and do nothing except
+    # enable optional dependencies.
     crateFeatures = lib.optionals (crate ? features)
-      (builtins.filter (f: !lib.hasInfix "/" f) (crate.features ++ features));
+      (builtins.filter
+        (f: !(lib.hasInfix "/" f || lib.hasPrefix "dep:" f))
+        (crate.features ++ features)
+      );
 
     libName = if crate ? libName then crate.libName else crate.crateName;
     libPath = if crate ? libPath then crate.libPath else "";