tensorrt: dont break eval for unrelated packages

pkgs/development/libraries/science/math/tensorrt/extension.nix

···
     isSupported = fileData: elem cudaVersion fileData.supportedCudaVersions;
     # Return the first file that is supported. In practice there should only ever be one anyway.
     supportedFile = files: findFirst isSupported null files;
-    # Supported versions with versions as keys and file as value
-    supportedVersions = filterAttrs (version: file: file !=null ) (mapAttrs (version: files: supportedFile files) tensorRTVersions);
+
     # Compute versioned attribute name to be used in this package set
     computeName = version: "tensorrt_${toUnderscore version}";
+
+    # Supported versions with versions as keys and file as value
+    supportedVersions = lib.recursiveUpdate
+      {
+        tensorrt = {
+          enable = false;
+          fileVersionCuda = null;
+          fileVersionCudnn = null;
+          fullVersion = "0.0.0";
+          sha256 = null;
+          tarball = null;
+          supportedCudaVersions = [ ];
+        };
+      }
+      (mapAttrs' (version: attrs: nameValuePair (computeName version) attrs)
+        (filterAttrs (version: file: file != null) (mapAttrs (version: files: supportedFile files) tensorRTVersions)));
+
     # Add all supported builds as attributes
-    allBuilds = mapAttrs' (version: file: nameValuePair (computeName version) (buildTensorRTPackage (removeAttrs file ["fileVersionCuda"]))) supportedVersions;
+    allBuilds = mapAttrs (name: file: buildTensorRTPackage (removeAttrs file ["fileVersionCuda"])) supportedVersions;
+
     # Set the default attributes, e.g. tensorrt = tensorrt_8_4;
-    defaultBuild = { "tensorrt" = if allBuilds ? ${computeName tensorRTDefaultVersion}
-      then allBuilds.${computeName tensorRTDefaultVersion}
-      else throw "tensorrt-${tensorRTDefaultVersion} does not support your cuda version ${cudaVersion}"; };
+    defaultName = computeName tensorRTDefaultVersion;
+    defaultBuild = lib.optionalAttrs (allBuilds ? ${defaultName}) { tensorrt = allBuilds.${computeName tensorRTDefaultVersion}; };
   in {
     inherit buildTensorRTPackage;
   } // allBuilds // defaultBuild;

pkgs/development/libraries/science/math/tensorrt/generic.nix

···
 , cudnn
 }:
 
-{ fullVersion
+{ enable ? true
+, fullVersion
 , fileVersionCudnn ? null
 , tarball
 , sha256
 , supportedCudaVersions ? [ ]
 }:
 
-assert fileVersionCudnn == null || lib.assertMsg (lib.strings.versionAtLeast cudnn.version fileVersionCudnn)
+assert !enable || fileVersionCudnn == null || lib.assertMsg (lib.strings.versionAtLeast cudnn.version fileVersionCudnn)
   "This version of TensorRT requires at least cuDNN ${fileVersionCudnn} (current version is ${cudnn.version})";
 
 backendStdenv.mkDerivation rec {
   pname = "cudatoolkit-${cudatoolkit.majorVersion}-tensorrt";
   version = fullVersion;
-  src = requireFile rec {
+  src = if !enable then null else
+  requireFile rec {
     name = tarball;
     inherit sha256;
     message = ''
···
 
   outputs = [ "out" "dev" ];
 
-  nativeBuildInputs = [
+  nativeBuildInputs = lib.optionals enable [
     autoPatchelfHook
     autoAddOpenGLRunpathHook
   ];
 
   # Used by autoPatchelfHook
-  buildInputs = [
+  buildInputs = lib.optionals enable [
     backendStdenv.cc.cc.lib # libstdc++
     cudatoolkit
     cudnn
···
     '';
 
   passthru.stdenv = backendStdenv;
+  passthru.enable = enable;
 
   meta = with lib; {
     # Check that the cudatoolkit version satisfies our min/max constraints (both
···
     # official version constraints (as recorded in default.nix). In some cases
     # you _may_ be able to smudge version constraints, just know that you're
     # embarking into unknown and unsupported territory when doing so.
-    broken = !(elem cudaVersion supportedCudaVersions);
+    broken = !enable || !(elem cudaVersion supportedCudaVersions);
     description = "TensorRT: a high-performance deep learning interface";
     homepage = "https://developer.nvidia.com/tensorrt";
     license = licenses.unfree;

pkgs/top-level/python-packages.nix

···
 
   tensorly = callPackage ../development/python-modules/tensorly { };
 
-  tensorrt = callPackage ../development/python-modules/tensorrt { };
+  tensorrt = callPackage ../development/python-modules/tensorrt { cudaPackages = pkgs.cudaPackages_11; };
 
   tensorstore = callPackage ../development/python-modules/tensorstore { };