stdenv: fix meson rust cross compilation

pkgs/desktops/gnome/core/gnome-tour/default.nix

@@ -17,7 +17,6 @@
 , libadwaita
 , librsvg
 , rustc
-, writeText
 , cargo
 }:
 
@@ -59,16 +58,6 @@ stdenv.mkDerivation rec {
     librsvg
   ];
 
-  mesonFlags =
-    let
-      # ERROR: 'rust' compiler binary not defined in cross or native file
-      crossFile = writeText "cross-file.conf" ''
-        [binaries]
-        rust = [ 'rustc', '--target', '${stdenv.hostPlatform.rust.rustcTargetSpec}' ]
-      '';
-    in
-    lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [ "--cross-file=${crossFile}" ];
-
   passthru = {
     updateScript = gnome.updateScript {
       packageName = pname;

pkgs/development/libraries/gstreamer/rs/default.nix

@@ -2,7 +2,6 @@
 , stdenv
 , fetchFromGitLab
 , fetchpatch
-, writeText
 , rustPlatform
 , meson
 , ninja
@@ -204,14 +203,7 @@ stdenv.mkDerivation rec {
   ) ++ [
     (lib.mesonOption "sodium-source" "system")
     (lib.mesonEnable "doc" enableDocumentation)
-  ] ++ (let
-    crossFile = writeText "cross-file.conf" ''
-      [binaries]
-      rust = [ 'rustc', '--target', '${stdenv.hostPlatform.rust.rustcTargetSpec}' ]
-    '';
-  in lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
-    "--cross-file=${crossFile}"
-  ]);
+  ];
 
   # turn off all auto plugins since we use a list of plugins we generate
   mesonAutoFeatures = "disabled";

pkgs/stdenv/generic/make-derivation.nix

@@ -402,6 +402,7 @@ else let
 
           crossFile = builtins.toFile "cross-file.conf" ''
             [properties]
+            bindgen_clang_arguments = ['-target', '${stdenv.targetPlatform.config}']
             needs_exe_wrapper = ${lib.boolToString (!stdenv.buildPlatform.canExecute stdenv.hostPlatform)}
 
             [host_machine]
@@ -412,6 +413,7 @@ else let
 
             [binaries]
             llvm-config = 'llvm-config-native'
+            rust = ['rustc', '--target', '${stdenv.targetPlatform.rust.rustcTargetSpec}']
           '';
           crossFlags = lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [ "--cross-file=${crossFile}" ];
         in crossFlags ++ mesonFlags;