3 files changed, 62 insertions, 18 deletions
diff --git a/pkgs/os-specific/windows/default.nix b/pkgs/os-specific/windows/default.nix
index 4621c2da10fb..7f1634d5c0b3 100644
--- a/pkgs/os-specific/windows/default.nix
+++ b/pkgs/os-specific/windows/default.nix
@@ -1,29 +1,45 @@
-{ newScope, crossLibcStdenv }: let
+{ stdenv, buildPackages
+, newScope, overrideCC, crossLibcStdenv, libcCross
+}:
 
-  callPackage = newScope self;
+stdenv.lib.makeScope newScope (self: with self; {
 
-  self = {
-    cygwinSetup = callPackage ./cygwin-setup { };
+  cygwinSetup = callPackage ./cygwin-setup { };
 
-    jom = callPackage ./jom { };
+  jom = callPackage ./jom { };
 
-    w32api = callPackage ./w32api { };
+  w32api = callPackage ./w32api { };
 
-    mingwrt = callPackage ./mingwrt { };
-    mingw_runtime = self.mingwrt;
+  mingwrt = callPackage ./mingwrt { };
+  mingw_runtime = mingwrt;
 
-    mingw_w64 = callPackage ./mingw-w64 {
-      stdenv = crossLibcStdenv;
-    };
-
-    mingw_w64_headers = callPackage ./mingw-w64/headers.nix { };
+  mingw_w64 = callPackage ./mingw-w64 {
+    stdenv = crossLibcStdenv;
+  };
 
-    mingw_w64_pthreads = callPackage ./mingw-w64/pthreads.nix { };
+  crossThreadsStdenv = overrideCC crossLibcStdenv
+    (if stdenv.hostPlatform.useLLVM or false
+     then buildPackages.llvmPackages_8.lldClangNoLibcxx
+     else buildPackages.gccCrossStageStatic.override (old: {
+       bintools = old.bintools.override {
+         libc = libcCross;
+       };
+       libc = libcCross;
+     }));
 
-    pthreads = callPackage ./pthread-w32 { };
+  mingw_w64_headers = callPackage ./mingw-w64/headers.nix { };
 
-    wxMSW = callPackage ./wxMSW-2.8 { };
+  mingw_w64_pthreads = callPackage ./mingw-w64/pthreads.nix {
+    stdenv = crossThreadsStdenv;
+  };
 
-    libgnurx = callPackage ./libgnurx { };
+  mcfgthreads = callPackage ./mcfgthreads {
+    stdenv = crossThreadsStdenv;
   };
-in self
+
+  pthreads = callPackage ./pthread-w32 { };
+
+  wxMSW = callPackage ./wxMSW-2.8 { };
+
+  libgnurx = callPackage ./libgnurx { };
+})
diff --git a/pkgs/os-specific/windows/mcfgthreads/default.nix b/pkgs/os-specific/windows/mcfgthreads/default.nix
new file mode 100644
index 000000000000..6c4cd1710256
--- /dev/null
+++ b/pkgs/os-specific/windows/mcfgthreads/default.nix
@@ -0,0 +1,24 @@
+{ stdenv, fetchFromGitHub, autoreconfHook }:
+
+stdenv.mkDerivation {
+  pname = "mcfgthreads";
+  version = "git";
+
+  src = fetchFromGitHub {
+    owner = "lhmouse";
+    repo = "mcfgthread";
+    rev = "9570e5ca7b98002d707c502c919d951bf256b9c6";
+    sha256 = "10y2x3x601a7c1hkd6zlr3xpfsnlr05xl28v23clf619756a5755";
+  };
+
+  outputs = [ "out" "dev" ];
+
+  # Don't want prebuilt binaries sneaking in.
+  postUnpack = ''
+    rm -r "$sourceRoot/debug" "$sourceRoot/release"
+  '';
+
+  nativeBuildInputs = [
+    autoreconfHook
+  ];
+}
diff --git a/pkgs/os-specific/windows/mingw-w64/default.nix b/pkgs/os-specific/windows/mingw-w64/default.nix
index 022aaffe5961..7efc2e213133 100644
--- a/pkgs/os-specific/windows/mingw-w64/default.nix
+++ b/pkgs/os-specific/windows/mingw-w64/default.nix
@@ -11,11 +11,15 @@ in stdenv.mkDerivation {
     sha256 = "00zq3z1hbzd5yzmskskjg79xrzwsqx7ihyprfaxy4hb897vf29sm";
   };
 
+  outputs = [ "out" "dev" ];
+
   configureFlags = [
     "--enable-idl"
     "--enable-secure-api"
   ];
 
+  enableParallelBuilding = true;
+
   buildInputs = [ windows.mingw_w64_headers ];
   dontStrip = true;
   hardeningDisable = [ "stackprotector" "fortify" ];