ENH: out of source build for paraview plugins

- more consistent with the rest of the OpenFOAM source tree

- improve wmake / wclean behaviour

applications/utilities/postProcessing/graphics/PVReaders/PVblockMeshReader/Allwmake

@@ -4,18 +4,30 @@ cd ${0%/*} || exit 1    # Run from this directory
 # Parse arguments for library compilation
 targetType=libso
 . $WM_PROJECT_DIR/wmake/scripts/AllwmakeParseArguments
-set -x
 
+# Source the wmake functions
+. $WM_DIR/scripts/wmakeFunctions
+
+# C++ compiler for CMake
+[ -n "$WM_CXX" ] && export CXX="$WM_CXX"
+
+set -x
 if [ -d "$ParaView_DIR" -a -r "$ParaView_DIR" ]
 then
     wmake $targetType vtkPVblockMesh
+    sourceDir=$PWD/PVblockMeshReader
+
+    # Where are any generated files stored?
+    findObjectDir $sourceDir
     (
-        cd PVblockMeshReader
-        mkdir -p Make/$WM_OPTIONS > /dev/null 2>&1
-        cd Make/$WM_OPTIONS
-        cmake ../..
-        make
-    )
+        mkdir -p $objectsDir \
+        && cd $objectsDir \
+        && cmake $sourceDir \
+        && make
+    ) || {
+        echo
+        echo "WARNING: incomplete build of ParaView BlockMesh plugin"
+    }
 fi
 
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