Add OpenCL Conformance Tests to PoCL

pkgs/pocl/default.nix

@@ -14,6 +14,8 @@
   python3,
   writableTmpDirAsHomeHook,
   writeText,
+  runCommand,
+  opencl-cts,
 
   fetchFromGitHub,
 
@@ -201,12 +203,38 @@ stdenv.mkDerivation (finalAttrs: {
     ''
   );
 
-  passthru = {
-    updateScript = nix-update-script { };
-    git = finalAttrs.finalPackage.override { useGit = true; };
-    test = finalAttrs.finalPackage.overrideAttrs { doCheck = true; };
-    withICD = enableICD;
-  };
+  passthru =
+    let
+      self = finalAttrs.finalPackage;
+    in
+    {
+      updateScript = nix-update-script { };
+      git = self.override { useGit = true; };
+
+      withICD = enableICD;
+
+      test = {
+        # Run builtin tests (causes a rebuild)
+        self = self.overrideAttrs { doCheck = true; };
+
+        # Run basic test from Khronos OpenCL Conformance Test Suite
+        # WARN: despite its name, test_basic is very exhaustive, and can take more
+        # than 1 hour in a marenostrum5 node.
+        cts =
+          assert enableICD;
+          lib.genAttrs [ "api" "basic" "c11_atomics" "printf" "svm" ] (
+            name:
+            runCommand "pocl-cts-test_${name}" {
+              nativeBuildInputs = [ self ];
+              requiredSystemFeatures = [ "sys-devices" ];
+              env = {
+                POCL_DEBUG = "error,warn";
+                POCL_CACHE_DIR = "/build/pocl_cache";
+              };
+            } "${opencl-cts}/bin/Release/test_${name} | tee $out"
+          );
+      };
+    };
 
   env.HWLOC_SYNTHETIC = lib.optionalDrvAttr enableHWLOC "node:1 core:1 pu:1";