libtensorflow: support building on OS X and add optional cuda support

pkgs/development/libraries/libtensorflow/default.nix

@@ -1,11 +1,50 @@
-{ stdenv, fetchurl, patchelf }:
+{ stdenv
-stdenv.mkDerivation rec {
+, fetchurl
+, patchelf
+, cudaSupport ? false, symlinkJoin, cudatoolkit, cudnn, nvidia_x11
+}:
+with stdenv.lib;
+let
+  tfType = if cudaSupport then "gpu" else "cpu";
+  system =
+    if stdenv.isx86_64
+    then if      stdenv.isLinux  then "linux-x86_64"
+         else if stdenv.isDarwin then "darwin-x86_64" else unavailable
+    else unavailable;
+  unavailable = throw "libtensorflow is not available for this platform!";
+  cudatoolkit_joined = symlinkJoin {
+    name = "unsplit_cudatoolkit";
+    paths = [ cudatoolkit.out
+              cudatoolkit.lib ];};
+  rpath = makeLibraryPath ([stdenv.cc.libc stdenv.cc.cc.lib] ++
+            optionals cudaSupport [ cudatoolkit_joined cudnn nvidia_x11 ]);
+  patchLibs =
+    if stdenv.isDarwin
+    then ''
+      install_name_tool -id $out/lib/libtensorflow.so $out/lib/libtensorflow.so
+      install_name_tool -id $out/lib/libtensorflow_framework.so $out/lib/libtensorflow_framework.so
+    ''
+    else ''
+      ${patchelf}/bin/patchelf --set-rpath "${rpath}:$out/lib" $out/lib/libtensorflow.so
+      ${patchelf}/bin/patchelf --set-rpath "${rpath}" $out/lib/libtensorflow_framework.so
+    '';
+
+in stdenv.mkDerivation rec {
   pname = "libtensorflow";
   version = "1.8.0";
   name = "${pname}-${version}";
   src = fetchurl {
-    url = "https://storage.googleapis.com/tensorflow/${pname}/${pname}-cpu-linux-x86_64-${version}.tar.gz";
+    url = "https://storage.googleapis.com/tensorflow/${pname}/${pname}-${tfType}-${system}-${version}.tar.gz";
-    sha256 = "0qzy15rc3x961cyi3bqnygrcnw4x69r28xkwhpwrv1r0gi6k73ha";
+    sha256 =
+      if system == "linux-x86_64" then
+        if cudaSupport
+        then "0m1g4sqr9as0jgfx7wlyay2nkad6wgvsyk2gvhfkqkq5sm1vbx85"
+        else "0qzy15rc3x961cyi3bqnygrcnw4x69r28xkwhpwrv1r0gi6k73ha"
+      else if system == "darwin-x86_64" then
+        if cudaSupport
+        then unavailable
+        else "0q8lmyj8l50hl6l48c640ixanvhqf2836bicyl9p2x8sj97b7y8l"
+      else unavailable;
   };
 
   # Patch library to use our libc, libstdc++ and others
@@ -15,18 +54,16 @@ stdenv.mkDerivation rec {
     tar -C $out -xzf $src
     chmod +w $out/lib/libtensorflow.so
     chmod +w $out/lib/libtensorflow_framework.so
-    ${patchelf}/bin/patchelf --set-rpath "${stdenv.cc.libc}/lib:${stdenv.cc.cc.lib}/lib:$out/lib" $out/lib/libtensorflow.so
+    ${patchLibs}
-    ${patchelf}/bin/patchelf --set-rpath "${stdenv.cc.libc}/lib:${stdenv.cc.cc.lib}/lib" $out/lib/libtensorflow_framework.so
     chmod -w $out/lib/libtensorflow.so
     chmod -w $out/lib/libtensorflow_framework.so
   '';
 
-  meta = with stdenv.lib; {
+  meta = {
-    inherit version;
     description = "C API for TensorFlow";
-    license = licenses.asl20;
-    maintainers = [maintainers.basvandijk];
-    platforms = platforms.linux;
     homepage = https://www.tensorflow.org/versions/master/install/install_c;
+    license = licenses.asl20;
+    platforms = with platforms; linux ++ darwin;
+    maintainers = [maintainers.basvandijk];
   };
 }

pkgs/top-level/all-packages.nix

@@ -858,7 +858,12 @@ with pkgs;
 
   tensor = libsForQt5.callPackage ../applications/networking/instant-messengers/tensor { };
 
-  libtensorflow = callPackage ../development/libraries/libtensorflow { };
+  libtensorflow = callPackage ../development/libraries/libtensorflow {
+    cudaSupport = config.cudaSupport or false;
+    inherit (linuxPackages) nvidia_x11;
+    cudatoolkit = cudatoolkit_9_0;
+    cudnn = cudnn_cudatoolkit_9_0;
+  };
 
   blink1-tool = callPackage ../tools/misc/blink1-tool { };