From edd039abdceb14af8eb6ca28df444966447c5b47 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sun, 27 Mar 2022 18:41:23 +0800
Subject: [PATCH] windows: build LLD

---
 flake.nix                          |  1 +
 nix/windows/default.nix            | 32 ++++++++++++++++++++++++++
 nix/windows/lld-disable-macho.diff | 36 ++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 nix/windows/lld-disable-macho.diff

diff --git a/flake.nix b/flake.nix
index da94de64e..a51f860bb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -142,6 +142,7 @@
         inherit (packages.x86_64-linux) llvm-nac3 nac3artiq;
         llvm-nac3-msys2 = packages.x86_64-w64-mingw32.llvm-nac3;
         nac3artiq-msys2 = packages.x86_64-w64-mingw32.nac3artiq;
+        lld-msys2 = packages.x86_64-w64-mingw32.lld;
       };
   };
 
diff --git a/nix/windows/default.nix b/nix/windows/default.nix
index 71248b7f5..4d48f2980 100644
--- a/nix/windows/default.nix
+++ b/nix/windows/default.nix
@@ -103,6 +103,38 @@ in rec {
       '';
     dontFixup = true;
   };
+  lld = pkgs.stdenvNoCC.mkDerivation rec {
+    pname = "lld-msys2";
+    version = "13.0.1";
+    src = pkgs.fetchurl {
+      url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-${version}/lld-${version}.src.tar.xz";
+      sha256 = "sha256-Zmr3Rei/e2gFM7TRi3ox3HyrV1sebk0mGSK7r9lkTPs=";
+    };
+    buildInputs = [ pkgs.wineWowPackages.stable ];
+    phases = [ "unpackPhase" "patchPhase" "configurePhase" "buildPhase" "installPhase" ];
+    patches = [ ./lld-disable-macho.diff ];
+    configurePhase =
+      ''
+      export HOME=`mktemp -d`
+      export WINEDEBUG=-all
+      export WINEPATH=Z:${msys2-env}/mingw64/bin\;Z:${llvm-nac3}/bin
+      ${silenceFontconfig}
+      mkdir build
+      cd build
+      wine64 cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=Z:$out
+      '';
+    buildPhase =
+      ''
+      wine64 ninja
+      '';
+    installPhase =
+      ''
+      wine64 ninja install
+      mkdir $out/nix-support
+      echo file binary-dist $out/bin/lld.exe >> $out/nix-support/hydra-build-products
+      '';
+    dontFixup = true;
+  };
   wine-msys2 = pkgs.writeShellScriptBin "wine-msys2"
     ''
     export WINEDEBUG=-all
diff --git a/nix/windows/lld-disable-macho.diff b/nix/windows/lld-disable-macho.diff
new file mode 100644
index 000000000..8f7a9a131
--- /dev/null
+++ b/nix/windows/lld-disable-macho.diff
@@ -0,0 +1,36 @@
+diff '--color=auto' -Naur lld-13.0.1.src/CMakeLists.txt lld-13.0.1.src-new/CMakeLists.txt
+--- lld-13.0.1.src/CMakeLists.txt	2022-01-21 05:31:59.000000000 +0800
++++ lld-13.0.1.src-new/CMakeLists.txt	2022-03-27 18:26:30.284921982 +0800
+@@ -206,7 +206,6 @@
+ add_subdirectory(docs)
+ add_subdirectory(COFF)
+ add_subdirectory(ELF)
+-add_subdirectory(MachO)
+ add_subdirectory(MinGW)
+ add_subdirectory(wasm)
+ 
+diff '--color=auto' -Naur lld-13.0.1.src/tools/lld/CMakeLists.txt lld-13.0.1.src-new/tools/lld/CMakeLists.txt
+--- lld-13.0.1.src/tools/lld/CMakeLists.txt	2022-01-21 05:31:59.000000000 +0800
++++ lld-13.0.1.src-new/tools/lld/CMakeLists.txt	2022-03-27 18:26:40.805046295 +0800
+@@ -15,7 +15,6 @@
+   lldCOFF
+   lldDriver
+   lldELF
+-  lldMachO2
+   lldMinGW
+   lldWasm
+   )
+diff '--color=auto' -Naur lld-13.0.1.src/tools/lld/lld.cpp lld-13.0.1.src-new/tools/lld/lld.cpp
+--- lld-13.0.1.src/tools/lld/lld.cpp	2022-01-21 05:31:59.000000000 +0800
++++ lld-13.0.1.src-new/tools/lld/lld.cpp	2022-03-27 08:43:54.205524156 +0800
+@@ -148,10 +148,6 @@
+     return !elf::link(args, exitEarly, stdoutOS, stderrOS);
+   case WinLink:
+     return !coff::link(args, exitEarly, stdoutOS, stderrOS);
+-  case Darwin:
+-    return !macho::link(args, exitEarly, stdoutOS, stderrOS);
+-  case DarwinOld:
+-    return !mach_o::link(args, exitEarly, stdoutOS, stderrOS);
+   case Wasm:
+     return !lld::wasm::link(args, exitEarly, stdoutOS, stderrOS);
+   default: