Build with LLVM and musl

flake.nix

@@ -99,12 +99,22 @@
     };
 
     overlays = load ./overlay "overlay";
-    legacyPackages = eachSystem (system: platform:
+    legacyPackages = eachSystem (system: platform: let
-      import nixpkgs {
+      pkgs = import nixpkgs {
-        localSystem = builtins.currentSystem or platform;
+        localSystem = builtins.currentSystem or system;
         crossSystem = platform;
         overlays = [ self.overlays.default ];
-        config.allowUnsupportedSystem = true;
+        config = {
+          allowBroken = true;
+          allowUnsupportedSystem = true;
+        };
+      };
+    in pkgs // {
+      config = pkgs.config // {
+        replaceStdenv = { pkgs }: self.lib.stdenv pkgs pkgs.stdenv;
+        replaceCrossStdenv = { buildPackages, baseStdenv }:
+          self.lib.stdenv self.legacyPackages.${system} baseStdenv;
+      };
     });
 
     packages = eachSystem (system: platform:
@@ -126,6 +136,13 @@
           targetHost = config.networking.fqdnOrHostName;
           targetUser = null;
         };
+
+        nixpkgs = let
+          platform = self.lib.platforms.x86_64-linux;
+        in {
+          buildPlatform = builtins.currentSystem or platform.system;
+          hostPlatform = platform;
+        };
       };
     };
 

home/config/nil/home.nix

@@ -205,7 +205,7 @@ in {
     enable = true;
     envFile.text = let
       ls-colours = pkgs.runCommand "ls-colours" { } ''
-        ${lib.getExe pkgs.vivid} generate catppuccin-mocha >$out
+        ${lib.getExe pkgs.buildPackages.vivid} generate catppuccin-mocha >$out
       '' |> builtins.readFile;
     in ''
       load-env {

home/config/nil/music.nix

@@ -33,7 +33,7 @@ in lib.mkIf (osConfig.hardware.graphics.enable or false) {
   };
 
   services.mopidy = {
-    enable = true;
+#    enable = true;
     extensionPackages = with pkgs; [
       mopidy-iris
       mopidy-local

lib/platforms.nix

@@ -4,13 +4,25 @@ let inherit (nixpkgs) lib;
 in lib.mapAttrs (system: platform: lib.systems.elaborate platform) {
   "x86_64-linux" = {
     system = "x86_64-linux";
+    config = "x86_64-unknown-linux-musl";
+    useLLVM = true;
+    linker = "lld";
+    gcc.arch = "x86-64-v3";
   };
 
   "aarch64-linux" = {
     system = "aarch64-linux";
+    config = "aarch64-unknown-linux-musl";
+    useLLVM = true;
+    linker = "lld";
+    gcc.arch = "armv8-a";
   };
 
   "riscv64-linux" = {
     system = "riscv64-linux";
+    config = "riscv64-unknown-linux-musl";
+    useLLVM = true;
+    linker = "lld";
+    gcc.arch = "rv64imacfd";
   };
 }

lib/stdenv.nix

@@ -0,0 +1,42 @@
+{ ... }: pkgs: stdenv:
+
+let
+  inherit (lib) optionalAttrs optionals toList;
+  inherit (pkgs) lib;
+  inherit (stdenv) targetPlatform;
+in pkgs.addAttrsToDerivation (prevAttrs: let
+  overrideAlloc = prevAttrs.overrideAlloc or true;
+
+  inputs = optionals overrideAlloc [ pkgs.mimalloc ];
+
+  cflags = [ "-pipe" ];
+  ldflags = [
+    "-O2"
+    "--hash-style=gnu"
+  ] ++ optionals overrideAlloc [ "-lmimalloc" ];
+
+  rustflags = [
+    "-C" "opt-level=2"
+    "-C" "linker-flavor=ld.lld"
+    "-C" "lto"
+    "-C" "linker-plugin-lto"
+    "-C" "link-arg=--icf=safe"
+    "-C" "link-arg=--lto-O2"
+  ] ++ optionals (targetPlatform.isx86_64 && targetPlatform ? gcc.arch) [
+    "-C" "target-cpu=${targetPlatform.gcc.arch}"
+  ] ++ (map (flag: [ "-C" "link-arg=${flag}" ]) ldflags |> lib.flatten);
+in {
+  buildInputs = prevAttrs.buildInputs or [ ] ++ inputs;
+
+  env = prevAttrs.env or { } // optionalAttrs (!prevAttrs ? NIX_CFLAGS_COMPILE) {
+    NIX_CFLAGS_COMPILE = toList prevAttrs.env.NIX_CFLAGS_COMPILE or [ ] ++ cflags |> toString;
+  } // optionalAttrs (prevAttrs ? env.NIX_LDFLAGS) {
+    NIX_LDFLAGS = toList prevAttrs.NIX_LDFLAGS or [ ] ++ ldflags |> toString;
+  };
+
+  NIX_RUSTFLAGS = prevAttrs.NIX_RUSTFLAGS or [ ] ++ rustflags;
+} // optionalAttrs (prevAttrs ? NIX_CFLAGS_COMPILE) {
+  NIX_CFLAGS_COMPILE = toList prevAttrs.NIX_CFLAGS_COMPILE or [ ] ++ cflags;
+} // optionalAttrs (!prevAttrs ? env.NIX_LDFLAGS) {
+  NIX_LDFLAGS = toList prevAttrs.NIX_LDFLAGS or [ ] ++ ldflags;
+}) stdenv

nixos/module/default.nix

@@ -11,6 +11,7 @@
     iosched
     kernel
     locale-en_EU
+    musl
     network
     nix
     openssh

nixos/module/musl.nix

@@ -0,0 +1,7 @@
+{ ...}: { modulesPath, ... }: {
+  disabledModules = [
+    (modulesPath + "/config/ldso.nix")
+    (modulesPath + "/programs/nix-ld.nix")
+    (modulesPath + "/config/stub-ld.nix")
+  ];
+}

overlay/fixes.nix

@@ -1,9 +1,35 @@
-{ nixpkgs, ... }: final: prev: 
+{ self, nixpkgs, ... }: final: prev: 
 let
   inherit (nixpkgs) lib;
   inherit (lib) toList;
-  inherit (prev.stdenv) hostPlatform;
+  inherit (prev.stdenv) buildPlatform hostPlatform;
+  inherit (self.lib) removePackages;
 in {
+  bind = prev.bind.overrideAttrs (prevAttrs: {
+    buildInputs = prevAttrs.buildInputs or [ ]
+      |> removePackages [ "jemalloc" ];
+  });
+
+  keyutils = prev.keyutils.overrideAttrs (prevAttrs: {
+    NIX_LDFLAGS = toList prevAttrs.NIX_LDFLAGS or [ ] ++ [ "--undefined-version" ];
+  });
+
+  kexec-tools = prev.kexec-tools.override { stdenv = final.gccStdenv; };
+
+  llvmPackages = prev.llvmPackages // {
+    libcxx = prev.llvmPackages.libcxx.override {
+      devExtraCmakeFlags = [ "-DLIBCXX_HAS_MUSL_LIBC=1" ];
+    };
+  };
+
+  netbsd = prev.netbsd.overrideScope (final: prev: {
+    compatIfNeeded = [ final.compat ];
+
+    compat = prev.compat.overrideAttrs (prevAttrs: {
+      makeFlags = prevAttrs.makeFlags ++ [ "OBJCOPY=:" ];
+    });
+  });
+
   numactl = prev.numactl.overrideAttrs (prevAttrs: {
     patches = prevAttrs.patches or [ ] ++ [
       (final.fetchpatch {
@@ -13,19 +39,33 @@ in {
     ];
   });
 
-  redis = prev.redis.overrideAttrs {
+  python3 = (prev.python3.overrideAttrs (prevAttrs: {
-    doCheck = false;
+    postFixup = prevAttrs.postFixup + ''
-  };
+      cat <<EOF >>"$out/nix-support/setup-hook"
+      setuptoolsDistutilsHook() {
+        export SETUPTOOLS_USE_DISTUTILS="stdlib"
+      }
 
-  python312 = prev.python312.override {
+      addEnvHooks "\$hostOffset" setuptoolsDistutilsHook
+      EOF
+    '';
+  })).override {
+    enableLTO = false;
     packageOverrides = final: prev: {
-      pywebview = prev.pywebview.overrideAttrs ({
+      html5-parser = prev.html5-parser.overrideAttrs (prevAttrs: {
-        doCheck = false;
+        env = prevAttrs.env or { } // {
-        doInstallCheck = false;
+          LD = "${final.buildPackages.stdenv.cc.targetPrefix}ld";
+        };
       });
     };
   };
 
+  python3Packages = final.python3.pkgs;
+
+  redis = prev.redis.overrideAttrs {
+    doCheck = false;
+  };
+
   sioyek = prev.sioyek.overrideAttrs (prevAttrs: {
     env = prevAttrs.env or { } // {
       NIX_CFLAGS_COMPILE = toList prevAttrs.env.NIX_CFLAGS_COMPILE or [ ]
@@ -33,10 +73,22 @@ in {
     };
   });
 
+  time = prev.time.overrideAttrs (prevAttrs: {
+    env = prevAttrs.env or { } // {
+      CFLAGS = toList prevAttrs.env.CFLAGS or [ ] ++ [
+        "-Wno-error=implicit-function-declaration"
+      ] |> toString;
+    };
+  });
+
   zeromq = prev.zeromq.overrideAttrs (prevAttrs: {
     postPatch = prevAttrs.postPatch or "" + ''
       substituteInPlace CMakeLists.txt \
         --replace-fail 'CACHELINE_SIZE EQUAL "undefined"' 'CACHELINE_SIZE STREQUAL "undefined"'
     '';
   });
+
+  zlib = prev.zlib.override {
+    splitStaticOutput = false;
+  };
 }

overlay/mimalloc.nix

@@ -4,6 +4,7 @@ let
   inherit (nixpkgs) lib;
 in {
   mimalloc = (prev.mimalloc.overrideAttrs (prevAttrs: {
+    overrideAlloc = false;
     postPatch = prevAttrs.postPatch or "" + ''
       sed -E -i \
         -e 's/(\{ )1(, UNINIT, MI_OPTION_LEGACY\(purge_decommits,reset_decommits\) \})/\10\2/' \
@@ -33,10 +34,6 @@ in {
 
   fractal = prev.fractal.overrideAttrs (prevAttrs: {
     nativeBuildInputs = prevAttrs.nativeBuildInputs or [ ] ++ [ final.makeBinaryWrapper ];
-    buildInputs = prevAttrs.buildInputs or [ ] ++ [ final.mimalloc ];
-
-    NIX_RUSTFLAGS = lib.toList prevAttrs.NIX_RUSTFLAGS or [ ] ++ [ "-C" "link-arg=-lmimalloc" ];
-    
     postInstall = prevAttrs.postInstall or "" + ''
       wrapProgram "$out/bin/fractal" \
         --set MIMALLOC_RESERVE_HUGE_OS_PAGES 1
@@ -47,47 +44,8 @@ in {
     mpv = final.mpv-unwrapped;
     extraMakeWrapperArgs = [ "--set" "MIMALLOC_RESERVE_HUGE_OS_PAGES" "1" ];
   };
-} // lib.genAttrs [
-  "bat"
-  "bottom"
-  "cryptsetup"
-  "dbus-broker"
-  "erlang"
-  "fd"
-  "firefox-unwrapped"
-  "fuzzel"
-  "helix"
-  "kitty"
-  "mako"
-  "mpv-unwrapped"
-  "niri"
-  "nix"
-  "nushell"
-  "openssh"
-  "pipewire"
-  "pueue"
-  "ripgrep"
-  "sd"
-  "sioyek"
-  "sudo-rs"
-  "systemd"
-  "swayidle"
-  "swaylock"
-  "swaylock-effects"
-  "thunderbird-unwrapped"
-  "uutils-coreutils"
-  "uutils-coreutils-noprefix"
-  "waybar"
-  "wirepluber"
-  "xdg-desktop-portal-gnome"
-  "xdg-desktop-portal-gtk"
-] (pkg: prev.${pkg}.overrideAttrs (prevAttrs: {
-  buildInputs = prevAttrs.buildInputs or [ ] ++ [ final.mimalloc ];
-  env = prevAttrs.env or { } // lib.optionalAttrs (prevAttrs ? env.NIX_LDFLAGS) {
-    NIX_LDFLAGS = toString (lib.toList prevAttrs.env.NIX_LDFLAGS or [ ] ++ [ "-lmimalloc" ]);
-  };
 
-  NIX_RUSTFLAGS = lib.toList prevAttrs.NIX_RUSTFLAGS or [ ] ++ [ "-C" "link-arg=-lmimalloc" ];
+  perl = prev.perl.overrideAttrs {
-} // lib.optionalAttrs (!prevAttrs ? env.NIX_LDFLAGS) {
+    overrideAlloc = false;
-  NIX_LDFLAGS = lib.toList prevAttrs.NIX_LDFLAGS or [ ] ++ [ "-lmimalloc" ];
+  };
-}))
+}