Add PoCL passthru test that sets doCheck

Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>

pkgs/pocl/default.nix

@@ -199,8 +199,18 @@ stdenv.mkDerivation (finalAttrs: {
   passthru = {
     updateScript = nix-update-script { };
     git = finalAttrs.finalPackage.override { useGit = true; };
+    test = finalAttrs.finalPackage.overrideAttrs { doCheck = true; };
   };
 
+  requiredSystemFeatures = lib.optionals (finalAttrs.finalPackage.doCheck && enableHWLOC) [
+    "sys-devices"
+  ];
+
+  preCheck = ''
+    export POCL_DEBUG=error,warn
+    export NIX_DEBUG=1
+  '';
+
   propagatedBuildInputs = [ stdenv.cc.cc ];
 
   meta = with lib; {