cosmic-settings: use mold linker

Author: HeitorAugustoLN

pkgs/by-name/co/cosmic-settings/package.nix

@@ -1,6 +1,7 @@
 {
   lib,
   stdenv,
+  stdenvAdapters,
   fetchFromGitHub,
   rustPlatform,
   cmake,
@@ -18,83 +19,90 @@
   cosmic-randr,
   xkeyboard_config,
   nix-update-script,
+
+  withMoldLinker ? stdenv.targetPlatform.isLinux,
 }:
 let
   libcosmicAppHook' = (libcosmicAppHook.__spliced.buildHost or libcosmicAppHook).override {
     includeSettings = false;
   };
 in
-rustPlatform.buildRustPackage rec {
-  pname = "cosmic-settings";
-  version = "1.0.0-alpha.6";
+rustPlatform.buildRustPackage.override
+  { stdenv = if withMoldLinker then stdenvAdapters.useMoldLinker stdenv else stdenv; }
+  rec {
+    pname = "cosmic-settings";
+    version = "1.0.0-alpha.6";
 
-  src = fetchFromGitHub {
-    owner = "pop-os";
-    repo = "cosmic-settings";
-    tag = "epoch-${version}";
-    hash = "sha256-UKg3TIpyaqtynk6wLFFPpv69F74hmqfMVPra2+iFbvE=";
-  };
+    src = fetchFromGitHub {
+      owner = "pop-os";
+      repo = "cosmic-settings";
+      tag = "epoch-${version}";
+      hash = "sha256-UKg3TIpyaqtynk6wLFFPpv69F74hmqfMVPra2+iFbvE=";
+    };
 
-  useFetchCargoVendor = true;
-  cargoHash = "sha256-mf/Cw3/RLrCYgsk7JKCU2+oPn1VPbD+4JzkUmbd47m8=";
+    useFetchCargoVendor = true;
+    cargoHash = "sha256-mf/Cw3/RLrCYgsk7JKCU2+oPn1VPbD+4JzkUmbd47m8=";
 
-  nativeBuildInputs = [
-    cmake
-    just
-    libcosmicAppHook'
-    pkg-config
-    rustPlatform.bindgenHook
-    util-linux
-  ];
+    nativeBuildInputs = [
+      cmake
+      just
+      libcosmicAppHook'
+      pkg-config
+      rustPlatform.bindgenHook
+      util-linux
+    ];
+
+    buildInputs = [
+      expat
+      fontconfig
+      freetype
+      libinput
+      pipewire
+      pulseaudio
+      udev
+    ];
 
-  buildInputs = [
-    expat
-    fontconfig
-    freetype
-    libinput
-    pipewire
-    pulseaudio
-    udev
-  ];
+    dontUseJustBuild = true;
+    dontUseJustCheck = true;
 
-  dontUseJustBuild = true;
-  dontUseJustCheck = true;
+    justFlags = [
+      "--set"
+      "prefix"
+      (placeholder "out")
+      "--set"
+      "bin-src"
+      "target/${stdenv.hostPlatform.rust.cargoShortTarget}/release/cosmic-settings"
+    ];
 
-  justFlags = [
-    "--set"
-    "prefix"
-    (placeholder "out")
-    "--set"
-    "bin-src"
-    "target/${stdenv.hostPlatform.rust.cargoShortTarget}/release/cosmic-settings"
-  ];
+    env."CARGO_TARGET_${stdenv.hostPlatform.rust.cargoEnvVarTarget}_RUSTFLAGS" =
+      lib.optionalString withMoldLinker "-C link-arg=-fuse-ld=mold";
 
-  preFixup = ''
-    libcosmicAppWrapperArgs+=(
-      --prefix PATH : ${lib.makeBinPath [ cosmic-randr ]}
-      --set-default X11_BASE_RULES_XML ${xkeyboard_config}/share/X11/xkb/rules/base.xml
-      --set-default X11_BASE_EXTRA_RULES_XML ${xkeyboard_config}/share/X11/xkb/rules/extra.xml
-    )
-  '';
+    preFixup = ''
+      libcosmicAppWrapperArgs+=(
+        --prefix PATH : ${lib.makeBinPath [ cosmic-randr ]}
+        --set-default X11_BASE_RULES_XML ${xkeyboard_config}/share/X11/xkb/rules/base.xml
+        --set-default X11_BASE_EXTRA_RULES_XML ${xkeyboard_config}/share/X11/xkb/rules/extra.xml
+      )
+    '';
 
-  passthru.updateScript = nix-update-script {
-    extraArgs = [
-      "--version"
-      "unstable"
-      "--version-regex"
-      "epoch-(.*)"
-    ];
-  };
+    passthru.updateScript = nix-update-script {
+      extraArgs = [
+        "--version"
+        "unstable"
+        "--version-regex"
+        "epoch-(.*)"
+      ];
+    };
 
-  meta = {
-    description = "Settings for the COSMIC Desktop Environment";
-    homepage = "https://github.com/pop-os/cosmic-settings";
-    license = lib.licenses.gpl3Only;
-    mainProgram = "cosmic-settings";
-    maintainers = with lib.maintainers; [
-      nyabinary
-      HeitorAugustoLN
-    ];
-    platforms = lib.platforms.linux;
-  };
-}
+    meta = {
+      description = "Settings for the COSMIC Desktop Environment";
+      homepage = "https://github.com/pop-os/cosmic-settings";
+      license = lib.licenses.gpl3Only;
+      mainProgram = "cosmic-settings";
+      maintainers = with lib.maintainers; [
+        nyabinary
+        HeitorAugustoLN
+      ];
+      platforms = lib.platforms.linux;
+    };
+  }