From 68dae2e1f058c0d60ea1d8fabb79f2e502b12d1c Mon Sep 17 00:00:00 2001
From: eyjhb <eyjhbb@gmail.com>
Date: Sat, 5 Oct 2024 21:18:27 +0200
Subject: [PATCH] fixed targets not working

---
 src/modules/languages/rust.nix | 39 +++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/src/modules/languages/rust.nix b/src/modules/languages/rust.nix
index b4cc2ce3d..381cd5278 100644
--- a/src/modules/languages/rust.nix
+++ b/src/modules/languages/rust.nix
@@ -9,6 +9,35 @@ let
     attribute = "languages.rust.input";
     follows = [ "nixpkgs" ];
   };
+
+  # https://github.com/nix-community/fenix/blob/cdfd7bf3e3edaf9e3f6d1e397d3ee601e513613c/lib/combine.nix
+  combine = name: paths:
+    pkgs.symlinkJoin {
+      inherit name paths;
+      postBuild = ''
+        for file in $(find $out/bin -xtype f -maxdepth 1); do
+          install -m755 $(realpath "$file") $out/bin
+    
+          if [[ $file =~ /rustfmt$ ]]; then
+            continue
+          fi
+    
+          ${lib.optionalString pkgs.stdenv.isLinux ''
+            if isELF "$file"; then
+              patchelf --set-rpath $out/lib "$file" || true
+            fi
+          ''}
+    
+          ${lib.optionalString pkgs.stdenv.isDarwin ''
+            install_name_tool -add_rpath $out/lib "$file" || true
+          ''}
+        done
+    
+        for file in $(find $out/lib -name "librustc_driver-*"); do
+          install $(realpath "$file") "$file"
+        done
+      '';
+    };
 in
 {
   imports = [
@@ -173,15 +202,19 @@ in
 
     (lib.mkIf (cfg.channel != "nixpkgs") (
       let
-        toolchain = (rust-overlay.lib.mkRustBin {} pkgs)."${cfg.channel}"."${cfg.version}";
-        # filter toolchain, otherwise it contains a bunch of non-rust stuff (llvm-tools, etc.)
+        toolchain = (rust-overlay.lib.mkRustBin {} pkgs.buildPackages)."${cfg.channel}"."${cfg.version}";
         filteredToolchain = (lib.filterAttrs (n: _: builtins.elem n toolchain._manifest.profiles.complete) toolchain);
       in
       {
         languages.rust.toolchain =
           (builtins.mapAttrs (_: pkgs.lib.mkDefault) filteredToolchain);
 
-        packages = builtins.attrValues (lib.filterAttrs (n: _: builtins.elem n cfg.components) cfg.toolchain);
+        packages = [
+          (combine "rust-mixed" (
+            (map (c: toolchain.${c}) cfg.components) ++
+            (map (t: toolchain._components.${t}.rust-std) cfg.targets)
+          ))
+        ];
       }
     ))
   ]);