Fix Cargo mismatch on MacOS build

.github/workflows/nix.yaml

@@ -103,6 +103,6 @@ jobs:
         uses: >- # v4
           DeterminateSystems/magic-nix-cache-action@fc6aaceb40b9845a02b91e059ec147e78d1b4e41
 
-      - name: Run build
-        run: >
-          nix build
+      - name: Test nix run
+        run: |
+           nix run -L .#nativelink-is-executable-test

flake.nix

@@ -88,7 +88,7 @@
 
         craneLib =
           if pkgs.stdenv.isDarwin
-          then crane.lib.${system}
+          then (crane.mkLib pkgs).overrideToolchain stable-rust.default
           else
             (crane.mkLib pkgs).overrideToolchain (stable-rust.default.override {
               targets = ["x86_64-unknown-linux-musl"];
@@ -139,6 +139,8 @@
 
         local-image-test = import ./tools/local-image-test.nix {inherit pkgs;};
 
+        nativelink-is-executable-test = import ./tools/nativelink-is-executable-test.nix {inherit pkgs nativelink;};
+
         generate-toolchains = import ./tools/generate-toolchains.nix {inherit pkgs;};
 
         native-cli = import ./native-cli/default.nix {inherit pkgs;};
@@ -201,7 +203,7 @@
           };
         };
         packages = rec {
-          inherit publish-ghcr local-image-test nativelink nativelink-debug native-cli lre-cc;
+          inherit publish-ghcr local-image-test nativelink-is-executable-test nativelink nativelink-debug native-cli lre-cc;
           default = nativelink;
 
           rbe-autogen-lre-cc = rbe-autogen lre-cc;
@@ -276,6 +278,7 @@
 
               # Additional tools from within our development environment.
               local-image-test
+              nativelink-is-executable-test
               generate-toolchains
               customClang
               native-cli

tools/nativelink-is-executable-test.nix

@@ -0,0 +1,27 @@
+{
+  pkgs,
+  nativelink,
+  ...
+}:
+pkgs.writeShellScriptBin "is-executable-test" ''
+  set -xuo pipefail
+
+  nativelink_output="$(${nativelink}/bin/nativelink 2>&1)"
+
+  print_error_output=$(cat <<EOF
+  error: the following required arguments were not provided:
+    <CONFIG_FILE>
+
+  Usage: nativelink <CONFIG_FILE>
+
+  For more information, try '--help'.
+  EOF)
+
+  if [ "$nativelink_output" = "$print_error_output" ]; then
+    echo "The output of nativelink matches the print_error output."
+  else
+    echo 'The output of nativelink does not match the print_error output:'
+    diff <(echo "$nativelink_output") <(echo "$print_error_output") >&2
+    exit 1
+  fi
+''