HDFFV-9994 port changes from develop.

CMake folder changes brought up to standard.

11 files changed, 741 insertions, 192 deletions

diff --git a/tools/h5diff/CMakeLists.txt b/tools/h5diff/CMakeLists.txt
index 5876045..fcb1a30 100644
--- a/tools/h5diff/CMakeLists.txt
+++ b/tools/h5diff/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.1.0)
+cmake_minimum_required (VERSION 3.2.2)
 PROJECT (HDF5_TOOLS_H5DIFF)
 
 #-----------------------------------------------------------------------------
@@ -45,7 +45,35 @@ if (BUILD_TESTING)
     set_target_properties (h5diffgentest PROPERTIES FOLDER generator/tools)
 
     #add_test (NAME h5diffgentest COMMAND $<TARGET_FILE:h5diffgentest>)
-  endif (HDF5_BUILD_GENERATORS)
+  endif ()
+
+  #-----------------------------------------------------------------------------
+  # If plugin library tests can be tested
+  #-----------------------------------------------------------------------------
+  set (HDF5_TOOL_PLUGIN_LIB_CORENAME         "dynlibdiff")
+  set (HDF5_TOOL_PLUGIN_LIB_NAME             "${HDF5_EXTERNAL_LIB_PREFIX}${HDF5_TOOL_PLUGIN_LIB_CORENAME}")
+  set (HDF5_TOOL_PLUGIN_LIB_TARGET           ${HDF5_TOOL_PLUGIN_LIB_CORENAME})
+  add_definitions (${HDF_EXTRA_C_FLAGS})
+  INCLUDE_DIRECTORIES (${HDF5_SRC_DIR})
+
+  add_library (${HDF5_TOOL_PLUGIN_LIB_TARGET} SHARED dynlib_diff.c)
+  TARGET_C_PROPERTIES (${HDF5_TOOL_PLUGIN_LIB_TARGET} SHARED " " " ")
+  target_link_libraries (${HDF5_TOOL_PLUGIN_LIB_TARGET} ${HDF5_TEST_LIB_TARGET})
+  H5_SET_LIB_OPTIONS (${HDF5_TOOL_PLUGIN_LIB_TARGET} ${HDF5_TOOL_PLUGIN_LIB_NAME} SHARED ${HDF5_PACKAGE_SOVERSION})
+
+  # make plugins dir
+  file (MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/plugins")
+  #-----------------------------------------------------------------------------
+  # Copy plugin library to a plugins folder
+  #-----------------------------------------------------------------------------
+  add_custom_command (
+      TARGET     ${HDF5_TOOL_PLUGIN_LIB_TARGET}
+      POST_BUILD
+      COMMAND    ${CMAKE_COMMAND}
+      ARGS       -E copy_if_different
+          "$<TARGET_FILE:${HDF5_TOOL_PLUGIN_LIB_TARGET}>"
+          "${CMAKE_BINARY_DIR}/plugins/$<TARGET_FILE_NAME:${HDF5_TOOL_PLUGIN_LIB_TARGET}>"
+  )
 
   include (CMakeTests.cmake)
 
diff --git a/tools/h5diff/CMakeTests.cmake b/tools/h5diff/CMakeTests.cmake
index f2a7ab3..91e0cab 100644
--- a/tools/h5diff/CMakeTests.cmake
+++ b/tools/h5diff/CMakeTests.cmake
@@ -50,6 +50,8 @@
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/compounds_array_vlen2.h5
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/non_comparables1.h5
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/non_comparables2.h5
+      ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/tudfilter.h5
+      ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/tudfilter2.h5
   )
 
   set (LIST_OTHER_TEST_FILES
@@ -227,6 +229,8 @@
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_710.txt
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_80.txt
       ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_90.txt
+      ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_ud.txt
+      ${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/h5diff_udfail.txt
   )
 
   set (LIST_WIN_TEST_FILES
@@ -238,6 +242,9 @@
 
   # Make testfiles dir under build dir
   file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles")
+  if (H5_HAVE_PARALLEL)
+    file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/PAR/testfiles")
+  endif ()
 
   #
   # copy test files from source to build dir
@@ -245,6 +252,9 @@
   foreach (h5_tstfiles ${LIST_HDF5_TEST_FILES} ${LIST_OTHER_TEST_FILES})
     get_filename_component(fname "${h5_tstfiles}" NAME)
     HDFTEST_COPY_FILE("${h5_tstfiles}" "${PROJECT_BINARY_DIR}/testfiles/${fname}" "h5diff_files")
+    if (H5_HAVE_PARALLEL)
+      HDFTEST_COPY_FILE("${h5_tstfiles}" "${PROJECT_BINARY_DIR}/PAR/testfiles/${fname}" "h5diff_files")
+    endif ()
   endforeach ()
 
 
@@ -255,11 +265,17 @@
     foreach (h5_tstfiles ${LIST_WIN_TEST_FILES})
       get_filename_component(fname "${h5_tstfiles}" NAME)
       HDFTEST_COPY_FILE("${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/${h5_tstfiles}w.txt" "${PROJECT_BINARY_DIR}/testfiles/${fname}.txt" "h5diff_files")
+      if (H5_HAVE_PARALLEL)
+        HDFTEST_COPY_FILE("${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/${h5_tstfiles}w.txt" "${PROJECT_BINARY_DIR}/PAR/testfiles/${fname}.txt" "h5diff_files")
+      endif ()
     endforeach ()
   else ()
     foreach (h5_tstfiles ${LIST_WIN_TEST_FILES})
       get_filename_component(fname "${h5_tstfiles}" NAME)
       HDFTEST_COPY_FILE("${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/${h5_tstfiles}.txt" "${PROJECT_BINARY_DIR}/testfiles/${fname}.txt" "h5diff_files")
+      if (H5_HAVE_PARALLEL)
+        HDFTEST_COPY_FILE("${HDF5_TOOLS_H5DIFF_SOURCE_DIR}/testfiles/${h5_tstfiles}.txt" "${PROJECT_BINARY_DIR}/PAR/testfiles/${fname}.txt" "h5diff_files")
+      endif ()
     endforeach ()
   endif ()
   add_custom_target(h5diff_files ALL COMMENT "Copying files needed by h5diff tests" DEPENDS ${h5diff_files_list})
@@ -281,12 +297,7 @@
       if (NOT "${last_test}" STREQUAL "")
         set_tests_properties (H5DIFF-${resultfile} PROPERTIES DEPENDS ${last_test})
       endif ()
-    else (HDF5_ENABLE_USING_MEMCHECKER)
-      add_test (
-          NAME H5DIFF-${resultfile}-clear-objects
-          COMMAND    ${CMAKE_COMMAND}
-              -E remove ./testfiles/${resultfile}.out ./testfiles/${resultfile}.out.err
-      )
+    else ()
       add_test (
           NAME H5DIFF-${resultfile}
           COMMAND "${CMAKE_COMMAND}"
@@ -299,78 +310,85 @@
               -D "TEST_APPEND=EXIT CODE:"
               -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
       )
-      set_tests_properties (H5DIFF-${resultfile} PROPERTIES DEPENDS "H5DIFF-${resultfile}-clear-objects")
-    endif (HDF5_ENABLE_USING_MEMCHECKER)
+    endif ()
     if (H5_HAVE_PARALLEL)
       ADD_PH5_TEST (${resultfile} ${resultcode} ${ARGN})
     endif ()
-  ENDMACRO (ADD_H5_TEST file)
+  ENDMACRO ()
 
   MACRO (ADD_PH5_TEST resultfile resultcode)
     # If using memchecker add tests without using scripts
     if (HDF5_ENABLE_USING_MEMCHECKER)
       add_test (NAME PH5DIFF-${resultfile} COMMAND $<TARGET_FILE:ph5diff> ${MPIEXEC} ${MPIEXEC_PREFLAGS} ${MPIEXEC_NUMPROC_FLAG} ${MPIEXEC_MAX_NUMPROCS} ${MPIEXEC_POSTFLAGS} ${ARGN})
-      set_tests_properties (PH5DIFF-${resultfile} PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles")
+      set_tests_properties (PH5DIFF-${resultfile} PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/PAR/testfiles")
       if (NOT ${resultcode} STREQUAL "0")
         set_tests_properties (PH5DIFF-${resultfile} PROPERTIES WILL_FAIL "true")
       endif ()
       if (NOT "${last_test}" STREQUAL "")
         set_tests_properties (PH5DIFF-${resultfile} PROPERTIES DEPENDS ${last_test})
       endif ()
-    else (HDF5_ENABLE_USING_MEMCHECKER)
-      add_test (
-          NAME PH5DIFF-${resultfile}-clear-objects
-          COMMAND    ${CMAKE_COMMAND}
-              -E remove ./testfiles/${resultfile}_p.out ./testfiles/${resultfile}_p.out.err
-      )
+    else ()
       add_test (
           NAME PH5DIFF-${resultfile}
           COMMAND "${CMAKE_COMMAND}"
               -D "TEST_PROGRAM=${MPIEXEC};${MPIEXEC_PREFLAGS};${MPIEXEC_NUMPROC_FLAG};${MPIEXEC_MAX_NUMPROCS};${MPIEXEC_POSTFLAGS};$<TARGET_FILE:ph5diff>"
               -D "TEST_ARGS:STRING=${ARGN}"
-              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
-              -D "TEST_OUTPUT=P_${resultfile}.out"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/PAR/testfiles"
+              -D "TEST_OUTPUT=${resultfile}.out"
               -D "TEST_EXPECT=${resultcode}"
               -D "TEST_REFERENCE=${resultfile}.txt"
 #              -D "TEST_APPEND=EXIT CODE: [0-9]"
 #              -D "TEST_REF_FILTER=EXIT CODE: 0"
               -D "TEST_SKIP_COMPARE=TRUE"
-              -P "${HDF_RESOURCES_EXT_DIR}/prunTest.cmake"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
       )
-      set_tests_properties (PH5DIFF-${resultfile} PROPERTIES DEPENDS "PH5DIFF-${resultfile}-clear-objects")
-    endif (HDF5_ENABLE_USING_MEMCHECKER)
-  ENDMACRO (ADD_PH5_TEST file)
-
-   # ADD_H5_NO_OUTPUT_TEST
-   # Purpose to verify only exitcode without output comparison
-   # Don't use this if possible; this may be removed.
-   MACRO (ADD_H5_NO_OUTPUT_TEST testname resultcode)
-    # If using memchecker add tests without using scripts
+    endif ()
+  ENDMACRO ()
+
+  MACRO (ADD_H5_UD_TEST testname resultcode resultfile)
     if (NOT HDF5_ENABLE_USING_MEMCHECKER)
+      # Remove any output file left over from previous test run
       add_test (
-          NAME H5DIFF-${testname}-clear-objects
+          NAME H5DIFF_UD-${testname}-clearall-objects
           COMMAND    ${CMAKE_COMMAND}
-              -E remove ./testfiles/${testname}.out ./testfiles/${testname}.out.err
+              -E remove
+              testfiles/${resultfile}.out
+              testfiles/${resultfile}.out.err
       )
-      # if there was a previous test
-      if (NOT "${last_test}" STREQUAL "")
-        set_tests_properties (H5DIFF-${testname}-clear-objects PROPERTIES DEPENDS ${last_test})
+      if (${resultcode} STREQUAL "2")
+        add_test (
+            NAME H5DIFF_UD-${testname}
+            COMMAND "${CMAKE_COMMAND}"
+                -D "TEST_PROGRAM=$<TARGET_FILE:h5diff>"
+                -D "TEST_ARGS:STRING=${ARGN}"
+                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
+                -D "TEST_OUTPUT=${resultfile}.out"
+                -D "TEST_EXPECT=${resultcode}"
+                -D "TEST_REFERENCE=${resultfile}.txt"
+                -D "TEST_APPEND=EXIT CODE:"
+                -D "TEST_ENV_VAR=HDF5_PLUGIN_PATH"
+                -D "TEST_ENV_VALUE=${CMAKE_BINARY_DIR}"
+                -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+        )
+      else ()
+        add_test (
+            NAME H5DIFF_UD-${testname}
+            COMMAND "${CMAKE_COMMAND}"
+                -D "TEST_PROGRAM=$<TARGET_FILE:h5diff>"
+                -D "TEST_ARGS:STRING=${ARGN}"
+                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
+                -D "TEST_OUTPUT=${resultfile}.out"
+                -D "TEST_EXPECT=${resultcode}"
+                -D "TEST_REFERENCE=${resultfile}.txt"
+                -D "TEST_APPEND=EXIT CODE:"
+                -D "TEST_ENV_VAR=HDF5_PLUGIN_PATH"
+                -D "TEST_ENV_VALUE=${CMAKE_BINARY_DIR}/plugins"
+                -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+        )
       endif ()
-    endif (NOT HDF5_ENABLE_USING_MEMCHECKER)
-
-    add_test (NAME H5DIFF-${testname} COMMAND $<TARGET_FILE:h5diff> ${ARGN})
-    if (NOT ${resultcode} STREQUAL "0")
-      set_tests_properties (H5DIFF-${testname} PROPERTIES WILL_FAIL "true")
+      set_tests_properties (H5DIFF_UD-${testname} PROPERTIES DEPENDS H5DIFF_UD-${testname}-clearall-objects)
     endif ()
-
-    if (HDF5_ENABLE_USING_MEMCHECKER)
-      if (NOT "${last_test}" STREQUAL "")
-        set_tests_properties (H5DIFF-${testname} PROPERTIES DEPENDS ${last_test})
-      endif ()
-    else (HDF5_ENABLE_USING_MEMCHECKER)
-      set_tests_properties (H5DIFF-${testname} PROPERTIES DEPENDS H5DIFF-${testname}-clear-objects)
-    endif (HDF5_ENABLE_USING_MEMCHECKER)
-  ENDMACRO (ADD_H5_NO_OUTPUT_TEST)
+  ENDMACRO ()
 
 ##############################################################################
 ##############################################################################
@@ -784,9 +802,9 @@
     set_tests_properties (H5DIFF-clearall-objects PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles")
     if (NOT "${last_test}" STREQUAL "")
       set_tests_properties (H5DIFF-clearall-objects PROPERTIES DEPENDS ${last_test})
-    endif (NOT "${last_test}" STREQUAL "")
+    endif ()
     set (last_test "H5DIFF-clearall-objects")
-  endif (HDF5_ENABLE_USING_MEMCHECKER)
+  endif ()
 
 # ############################################################################
 # # Common usage
@@ -1357,3 +1375,9 @@ ADD_H5_TEST (h5diff_643 1 -v -d 5 --use-system-epsilon ${FILE1} ${FILE2} /g1/dse
 ADD_H5_TEST (h5diff_644 1 -v --use-system-epsilon -d 5 ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
 ADD_H5_TEST (h5diff_645 1 -v -p 0.05 --use-system-epsilon ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
 ADD_H5_TEST (h5diff_646 1 -v --use-system-epsilon -p 0.05 ${FILE1} ${FILE2} /g1/dset3 /g1/dset4)
+
+##############################################################################
+###    P L U G I N  T E S T S
+##############################################################################
+ADD_H5_UD_TEST (h5diff_plugin_test 0 h5diff_ud -v tudfilter.h5 tudfilter2.h5)
+ADD_H5_UD_TEST (h5diff_plugin_fail 2 h5diff_udfail -v tudfilter.h5 tudfilter2.h5)
diff --git a/tools/h5diff/Makefile.am b/tools/h5diff/Makefile.am
index 7e3b620..0d01f14 100644
--- a/tools/h5diff/Makefile.am
+++ b/tools/h5diff/Makefile.am
@@ -44,6 +44,11 @@ check_PROGRAMS=$(TEST_PROG)
 check_SCRIPTS=$(TEST_SCRIPT) $(TEST_SCRIPT_PARA)
 # The parallel test script testph5diff.sh actually depends on testh5diff.sh.
 SCRIPT_DEPEND=h5diff$(EXEEXT) $(H5PDIFF) testh5diff.sh
+if HAVE_SHARED_CONDITIONAL
+if USE_PLUGINS_CONDITIONAL
+   TEST_SCRIPT += h5diff_plugin.sh
+endif
+endif
 
 # Source files for the program
 h5diff_SOURCES=h5diff_main.c h5diff_common.c
@@ -53,9 +58,20 @@ h5diffgentest_SOURCES=h5diffgentest.c
 # Programs depend on the main HDF5 library and tools library
 LDADD=$(LIBH5TOOLS) $(LIBHDF5)
 
+if HAVE_SHARED_CONDITIONAL
+  # Build it as shared library if configure is enabled for shared library.
+  lib_LTLIBRARIES=libdynlibdiff.la
+  libdynlibdiff_la_SOURCES=dynlib_diff.c
+
+install-exec-hook:
+	$(RM) $(DESTDIR)$(libdir)/*dynlib*
+endif
+
 # Temporary files.  *.h5 are generated by h5diff.  They should
 # be copied to the testfiles/ directory if update is required
 CHECK_CLEANFILES+=*.h5 expect_sorted actual_sorted
 
+DISTCLEANFILES=h5diff_plugin.sh
+
 include $(top_srcdir)/config/conclude.am
 
diff --git a/tools/h5diff/Makefile.in b/tools/h5diff/Makefile.in
index 92ec96d..a6bb1d1 100644
--- a/tools/h5diff/Makefile.in
+++ b/tools/h5diff/Makefile.in
@@ -31,6 +31,7 @@
 # HDF5 Library Makefile(.in)
 #
 
+
 VPATH = @srcdir@
 am__is_gnu_make = { \
   if test -z '$(MAKELEVEL)'; then \
@@ -107,6 +108,7 @@ build_triplet = @build@
 host_triplet = @host@
 bin_PROGRAMS = h5diff$(EXEEXT) $(am__EXEEXT_1)
 check_PROGRAMS = $(am__EXEEXT_2)
+@HAVE_SHARED_CONDITIONAL_TRUE@@USE_PLUGINS_CONDITIONAL_TRUE@am__append_1 = h5diff_plugin.sh
 TESTS = $(am__EXEEXT_2) $(TEST_SCRIPT)
 subdir = tools/h5diff
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -117,20 +119,55 @@ am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 DIST_COMMON = $(srcdir)/Makefile.am $(am__DIST_COMMON)
 mkinstalldirs = $(SHELL) $(top_srcdir)/bin/mkinstalldirs
 CONFIG_HEADER = $(top_builddir)/src/H5config.h
-CONFIG_CLEAN_FILES = testh5diff.sh testph5diff.sh
+CONFIG_CLEAN_FILES = h5diff_plugin.sh testh5diff.sh testph5diff.sh
 CONFIG_CLEAN_VPATH_FILES =
+am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
+am__vpath_adj = case $$p in \
+    $(srcdir)/*) f=`echo "$$p" | sed "s|^$$srcdirstrip/||"`;; \
+    *) f=$$p;; \
+  esac;
+am__strip_dir = f=`echo $$p | sed -e 's|^.*/||'`;
+am__install_max = 40
+am__nobase_strip_setup = \
+  srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*|]/\\\\&/g'`
+am__nobase_strip = \
+  for p in $$list; do echo "$$p"; done | sed -e "s|$$srcdirstrip/||"
+am__nobase_list = $(am__nobase_strip_setup); \
+  for p in $$list; do echo "$$p $$p"; done | \
+  sed "s| $$srcdirstrip/| |;"' / .*\//!s/ .*/ ./; s,\( .*\)/[^/]*$$,\1,' | \
+  $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \
+    if (++n[$$2] == $(am__install_max)) \
+      { print $$2, files[$$2]; n[$$2] = 0; files[$$2] = "" } } \
+    END { for (dir in files) print dir, files[dir] }'
+am__base_list = \
+  sed '$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;s/\n/ /g' | \
+  sed '$$!N;$$!N;$$!N;$$!N;s/\n/ /g'
+am__uninstall_files_from_dir = { \
+  test -z "$$files" \
+    || { test ! -d "$$dir" && test ! -f "$$dir" && test ! -r "$$dir"; } \
+    || { echo " ( cd '$$dir' && rm -f" $$files ")"; \
+         $(am__cd) "$$dir" && rm -f $$files; }; \
+  }
+am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(bindir)"
+LTLIBRARIES = $(lib_LTLIBRARIES)
+libdynlibdiff_la_LIBADD =
+am__libdynlibdiff_la_SOURCES_DIST = dynlib_diff.c
+@HAVE_SHARED_CONDITIONAL_TRUE@am_libdynlibdiff_la_OBJECTS =  \
+@HAVE_SHARED_CONDITIONAL_TRUE@	dynlib_diff.lo
+libdynlibdiff_la_OBJECTS = $(am_libdynlibdiff_la_OBJECTS)
+AM_V_lt = $(am__v_lt_@AM_V@)
+am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
+am__v_lt_0 = --silent
+am__v_lt_1 = 
+@HAVE_SHARED_CONDITIONAL_TRUE@am_libdynlibdiff_la_rpath = -rpath \
+@HAVE_SHARED_CONDITIONAL_TRUE@	$(libdir)
 @BUILD_PARALLEL_CONDITIONAL_TRUE@am__EXEEXT_1 = ph5diff$(EXEEXT)
-am__installdirs = "$(DESTDIR)$(bindir)"
 am__EXEEXT_2 = h5diffgentest$(EXEEXT)
 PROGRAMS = $(bin_PROGRAMS)
 am_h5diff_OBJECTS = h5diff_main.$(OBJEXT) h5diff_common.$(OBJEXT)
 h5diff_OBJECTS = $(am_h5diff_OBJECTS)
 h5diff_LDADD = $(LDADD)
 h5diff_DEPENDENCIES = $(LIBH5TOOLS) $(LIBHDF5)
-AM_V_lt = $(am__v_lt_@AM_V@)
-am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
-am__v_lt_0 = --silent
-am__v_lt_1 = 
 h5diff_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
 	$(h5diff_LDFLAGS) $(LDFLAGS) -o $@
@@ -176,10 +213,10 @@ AM_V_CCLD = $(am__v_CCLD_@AM_V@)
 am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
 am__v_CCLD_0 = @echo "  CCLD    " $@;
 am__v_CCLD_1 = 
-SOURCES = $(h5diff_SOURCES) $(h5diffgentest_SOURCES) \
-	$(ph5diff_SOURCES)
-DIST_SOURCES = $(h5diff_SOURCES) $(h5diffgentest_SOURCES) \
-	$(ph5diff_SOURCES)
+SOURCES = $(libdynlibdiff_la_SOURCES) $(h5diff_SOURCES) \
+	$(h5diffgentest_SOURCES) $(ph5diff_SOURCES)
+DIST_SOURCES = $(am__libdynlibdiff_la_SOURCES_DIST) $(h5diff_SOURCES) \
+	$(h5diffgentest_SOURCES) $(ph5diff_SOURCES)
 am__can_run_installinfo = \
   case $$AM_UPDATE_INFO_DIR in \
     n|no|NO) false;; \
@@ -226,33 +263,6 @@ am__tty_colors = { \
     std=''; \
   fi; \
 }
-am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
-am__vpath_adj = case $$p in \
-    $(srcdir)/*) f=`echo "$$p" | sed "s|^$$srcdirstrip/||"`;; \
-    *) f=$$p;; \
-  esac;
-am__strip_dir = f=`echo $$p | sed -e 's|^.*/||'`;
-am__install_max = 40
-am__nobase_strip_setup = \
-  srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*|]/\\\\&/g'`
-am__nobase_strip = \
-  for p in $$list; do echo "$$p"; done | sed -e "s|$$srcdirstrip/||"
-am__nobase_list = $(am__nobase_strip_setup); \
-  for p in $$list; do echo "$$p $$p"; done | \
-  sed "s| $$srcdirstrip/| |;"' / .*\//!s/ .*/ ./; s,\( .*\)/[^/]*$$,\1,' | \
-  $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \
-    if (++n[$$2] == $(am__install_max)) \
-      { print $$2, files[$$2]; n[$$2] = 0; files[$$2] = "" } } \
-    END { for (dir in files) print dir, files[dir] }'
-am__base_list = \
-  sed '$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;s/\n/ /g' | \
-  sed '$$!N;$$!N;$$!N;$$!N;s/\n/ /g'
-am__uninstall_files_from_dir = { \
-  test -z "$$files" \
-    || { test ! -d "$$dir" && test ! -f "$$dir" && test ! -r "$$dir"; } \
-    || { echo " ( cd '$$dir' && rm -f" $$files ")"; \
-         $(am__cd) "$$dir" && rm -f $$files; }; \
-  }
 am__recheck_rx = ^[ 	]*:recheck:[ 	]*
 am__global_test_result_rx = ^[ 	]*:global-test-result:[ 	]*
 am__copy_in_global_log_rx = ^[ 	]*:copy-in-global-log:[ 	]*
@@ -406,10 +416,10 @@ am__test_logs2 = $(am__test_logs1:@EXEEXT@.log=.log)
 TEST_LOGS = $(am__test_logs2:.sh.log=.log)
 SH_LOG_DRIVER = $(SHELL) $(top_srcdir)/bin/test-driver
 SH_LOG_COMPILE = $(SH_LOG_COMPILER) $(AM_SH_LOG_FLAGS) $(SH_LOG_FLAGS)
-am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/testh5diff.sh.in \
-	$(srcdir)/testph5diff.sh.in $(top_srcdir)/bin/depcomp \
-	$(top_srcdir)/bin/mkinstalldirs $(top_srcdir)/bin/test-driver \
-	$(top_srcdir)/config/commence.am \
+am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/h5diff_plugin.sh.in \
+	$(srcdir)/testh5diff.sh.in $(srcdir)/testph5diff.sh.in \
+	$(top_srcdir)/bin/depcomp $(top_srcdir)/bin/mkinstalldirs \
+	$(top_srcdir)/bin/test-driver $(top_srcdir)/config/commence.am \
 	$(top_srcdir)/config/conclude.am
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 ACLOCAL = @ACLOCAL@
@@ -696,7 +706,7 @@ h5diff_LDFLAGS = $(LT_STATIC_EXEC) $(AM_LDFLAGS)
 
 # Test programs and scripts
 TEST_PROG = h5diffgentest
-TEST_SCRIPT = testh5diff.sh
+TEST_SCRIPT = testh5diff.sh $(am__append_1)
 check_SCRIPTS = $(TEST_SCRIPT) $(TEST_SCRIPT_PARA)
 # The parallel test script testph5diff.sh actually depends on testh5diff.sh.
 SCRIPT_DEPEND = h5diff$(EXEEXT) $(H5PDIFF) testh5diff.sh
@@ -708,6 +718,9 @@ h5diffgentest_SOURCES = h5diffgentest.c
 
 # Programs depend on the main HDF5 library and tools library
 LDADD = $(LIBH5TOOLS) $(LIBHDF5)
+@HAVE_SHARED_CONDITIONAL_TRUE@lib_LTLIBRARIES = libdynlibdiff.la
+@HAVE_SHARED_CONDITIONAL_TRUE@libdynlibdiff_la_SOURCES = dynlib_diff.c
+DISTCLEANFILES = h5diff_plugin.sh
 
 # Automake needs to be taught how to build lib, progs, and tests targets.
 # These will be filled in automatically for the most part (e.g.,
@@ -762,10 +775,50 @@ $(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
 $(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
 	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
 $(am__aclocal_m4_deps):
+h5diff_plugin.sh: $(top_builddir)/config.status $(srcdir)/h5diff_plugin.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
 testh5diff.sh: $(top_builddir)/config.status $(srcdir)/testh5diff.sh.in
 	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
 testph5diff.sh: $(top_builddir)/config.status $(srcdir)/testph5diff.sh.in
 	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+
+install-libLTLIBRARIES: $(lib_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	@list='$(lib_LTLIBRARIES)'; test -n "$(libdir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(libdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(libdir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(libdir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(libdir)"; \
+	}
+
+uninstall-libLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(lib_LTLIBRARIES)'; test -n "$(libdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(libdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(libdir)/$$f"; \
+	done
+
+clean-libLTLIBRARIES:
+	-test -z "$(lib_LTLIBRARIES)" || rm -f $(lib_LTLIBRARIES)
+	@list='$(lib_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libdynlibdiff.la: $(libdynlibdiff_la_OBJECTS) $(libdynlibdiff_la_DEPENDENCIES) $(EXTRA_libdynlibdiff_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK) $(am_libdynlibdiff_la_rpath) $(libdynlibdiff_la_OBJECTS) $(libdynlibdiff_la_LIBADD) $(LIBS)
 install-binPROGRAMS: $(bin_PROGRAMS)
 	@$(NORMAL_INSTALL)
 	@list='$(bin_PROGRAMS)'; test -n "$(bindir)" || list=; \
@@ -843,6 +896,7 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c
 
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/dynlib_diff.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/h5diff_common.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/h5diff_main.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/h5diffgentest.Po@am__quote@
@@ -1113,9 +1167,11 @@ check-am: all-am
 	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS) $(check_SCRIPTS)
 	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
 check: check-am
-all-am: Makefile $(PROGRAMS) all-local
+all-am: Makefile $(LTLIBRARIES) $(PROGRAMS) all-local
+install-binPROGRAMS: install-libLTLIBRARIES
+
 installdirs:
-	for dir in "$(DESTDIR)$(bindir)"; do \
+	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(bindir)"; do \
 	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
 	done
 install: install-am
@@ -1147,14 +1203,16 @@ clean-generic:
 distclean-generic:
 	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
 	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-test -z "$(DISTCLEANFILES)" || rm -f $(DISTCLEANFILES)
 
 maintainer-clean-generic:
 	@echo "This command is intended for maintainers to use"
 	@echo "it deletes files that may require special tools to rebuild."
+@HAVE_SHARED_CONDITIONAL_FALSE@install-exec-hook:
 clean: clean-am
 
 clean-am: clean-binPROGRAMS clean-checkPROGRAMS clean-generic \
-	clean-libtool mostlyclean-am
+	clean-libLTLIBRARIES clean-libtool mostlyclean-am
 
 distclean: distclean-am
 	-rm -rf ./$(DEPDIR)
@@ -1180,8 +1238,9 @@ install-dvi: install-dvi-am
 
 install-dvi-am:
 
-install-exec-am: install-binPROGRAMS
-
+install-exec-am: install-binPROGRAMS install-libLTLIBRARIES
+	@$(NORMAL_INSTALL)
+	$(MAKE) $(AM_MAKEFLAGS) install-exec-hook
 install-html: install-html-am
 
 install-html-am:
@@ -1220,25 +1279,26 @@ ps: ps-am
 
 ps-am:
 
-uninstall-am: uninstall-binPROGRAMS
+uninstall-am: uninstall-binPROGRAMS uninstall-libLTLIBRARIES
 
-.MAKE: check-am install-am install-strip
+.MAKE: check-am install-am install-exec-am install-strip
 
 .PHONY: CTAGS GTAGS TAGS all all-am all-local check check-TESTS \
 	check-am clean clean-binPROGRAMS clean-checkPROGRAMS \
-	clean-generic clean-libtool cscopelist-am ctags ctags-am \
-	distclean distclean-compile distclean-generic \
+	clean-generic clean-libLTLIBRARIES clean-libtool cscopelist-am \
+	ctags ctags-am distclean distclean-compile distclean-generic \
 	distclean-libtool distclean-tags distdir dvi dvi-am html \
 	html-am info info-am install install-am install-binPROGRAMS \
 	install-data install-data-am install-dvi install-dvi-am \
-	install-exec install-exec-am install-html install-html-am \
-	install-info install-info-am install-man install-pdf \
-	install-pdf-am install-ps install-ps-am install-strip \
-	installcheck installcheck-am installdirs maintainer-clean \
+	install-exec install-exec-am install-exec-hook install-html \
+	install-html-am install-info install-info-am \
+	install-libLTLIBRARIES install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
 	maintainer-clean-generic mostlyclean mostlyclean-compile \
 	mostlyclean-generic mostlyclean-libtool mostlyclean-local pdf \
 	pdf-am ps ps-am recheck tags tags-am uninstall uninstall-am \
-	uninstall-binPROGRAMS
+	uninstall-binPROGRAMS uninstall-libLTLIBRARIES
 
 .PRECIOUS: Makefile
 
@@ -1254,6 +1314,11 @@ uninstall-am: uninstall-binPROGRAMS
 help:
 	@$(top_srcdir)/bin/makehelp
 
+@HAVE_SHARED_CONDITIONAL_TRUE@  # Build it as shared library if configure is enabled for shared library.
+
+@HAVE_SHARED_CONDITIONAL_TRUE@install-exec-hook:
+@HAVE_SHARED_CONDITIONAL_TRUE@	$(RM) $(DESTDIR)$(libdir)/*dynlib*
+
 # lib/progs/tests targets recurse into subdirectories. build-* targets
 # build files in this directory.
 build-lib: $(LIB)
diff --git a/tools/h5diff/dynlib_diff.c b/tools/h5diff/dynlib_diff.c
new file mode 100644
index 0000000..0d8be2b
--- /dev/null
+++ b/tools/h5diff/dynlib_diff.c
@@ -0,0 +1,94 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5. The full HDF5 copyright notice, including      *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic document set and is     *
+ * linked from the top-level documents page.  It can also be found at        *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have access   *
+ * to either file, you may request a copy from help@hdfgroup.org.            *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/*
+ * Programmer:	Raymond Lu
+ *		13 February 2013
+ *
+ * Purpose:	Tests the plugin module (H5PL)
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "H5PLextern.h"
+
+#define H5Z_FILTER_DYNLIB2      258 
+#define MULTIPLIER              3
+
+static size_t H5Z_filter_dynlib2(unsigned int flags, size_t cd_nelmts,
+                const unsigned int *cd_values, size_t nbytes, size_t *buf_size, void **buf);
+
+/* This message derives from H5Z */
+const H5Z_class2_t H5Z_DYNLIB2[1] = {{
+    H5Z_CLASS_T_VERS,                /* H5Z_class_t version             */
+    H5Z_FILTER_DYNLIB2,		     /* Filter id number		*/
+    1, 1,                            /* Encoding and decoding enabled   */
+    "dynlib2",			     /* Filter name for debugging	*/
+    NULL,                            /* The "can apply" callback        */
+    NULL,                            /* The "set local" callback        */
+    (H5Z_func_t)H5Z_filter_dynlib2,    /* The actual filter function	*/
+}};
+
+H5PL_type_t   H5PLget_plugin_type(void) {return H5PL_TYPE_FILTER;}
+const void   *H5PLget_plugin_info(void) {return H5Z_DYNLIB2;}
+
+/*-------------------------------------------------------------------------
+ * Function:	H5Z_filter_dynlib2
+ *
+ * Purpose:	A dynlib2 filter method that multiplies the original value 
+ *              during write and divide the original value during read. It
+ *              will be built as a shared library.  plugin.c test will load 
+ *              and use this filter library.    
+ *
+ * Return:	Success:	Data chunk size
+ *
+ *		Failure:	0
+ *
+ * Programmer:	Raymond Lu
+ *              29 March 2013
+ *
+ *-------------------------------------------------------------------------
+ */
+static size_t
+H5Z_filter_dynlib2(unsigned int flags, size_t cd_nelmts,
+      const unsigned int *cd_values, size_t nbytes,
+      size_t *buf_size, void **buf)
+{
+    int *int_ptr = (int *)*buf;          /* Pointer to the data values */
+    size_t buf_left = *buf_size;  /* Amount of data buffer left to process */
+
+    /* Check for the correct number of parameters */
+    if(cd_nelmts > 0)
+        return(0);
+
+    /* Assignment to eliminate unused parameter warning. */
+    cd_values = cd_values;
+
+    if(flags & H5Z_FLAG_REVERSE) { /*read*/
+        /* Divide the original value with MULTIPLIER */
+        while(buf_left > 0) {
+            *int_ptr++ /= MULTIPLIER;
+            buf_left -= sizeof(int);
+        } /* end while */
+    } /* end if */
+    else { /*write*/
+        /* Multiply the original value with MULTIPLIER */
+        while(buf_left > 0) {
+            *int_ptr++ *= MULTIPLIER;
+            buf_left -= sizeof(int);
+        } /* end while */
+    } /* end else */
+
+    return nbytes;
+} /* end H5Z_filter_dynlib2() */
+
diff --git a/tools/h5diff/h5diff_plugin.sh.in b/tools/h5diff/h5diff_plugin.sh.in
new file mode 100644
index 0000000..3f39d4c
--- /dev/null
+++ b/tools/h5diff/h5diff_plugin.sh.in
@@ -0,0 +1,299 @@
+#! /bin/sh
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5. The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the files COPYING and Copyright.html.  COPYING can be found at the root
+# of the source code distribution tree; Copyright.html can be found at the
+# root level of an installed copy of the electronic document set and is
+# linked from the top-level documents page.  It can also be found at
+# http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have access
+# to either file, you may request a copy from help@hdfgroup.org.
+#
+srcdir=@srcdir@
+TOP_BUILDDIR=@top_builddir@
+
+# Determine backward compatibility options enabled
+DEPRECATED_SYMBOLS="@DEPRECATED_SYMBOLS@"
+
+EXIT_SUCCESS=0
+EXIT_FAILURE=1
+
+H5DIFF=h5diff               # The tool name
+H5DIFF_BIN=`pwd`/$H5DIFF    # The path of the tool binary
+
+nerrors=0
+verbose=yes
+h5haveexitcode=yes        # default is yes
+
+TEST_NAME=h5diff_ud_plugin
+FROM_DIR=`pwd`/.libs
+PLUGIN_LIB="$FROM_DIR/libdynlibdiff.*"
+PLUGIN_LIBDIR=testdir3
+
+RM='rm -rf'
+CMP='cmp -s'
+DIFF='diff -c'
+CP='cp'
+DIRNAME='dirname'
+LS='ls'
+AWK='awk'
+
+# source dirs
+SRC_TOOLS="$srcdir/.."
+
+# testfiles source dirs for tools
+SRC_H5DIFF_TESTFILES="$SRC_TOOLS/h5diff/testfiles"
+
+TESTDIR=./testplug
+test -d $TESTDIR || mkdir $TESTDIR
+
+######################################################################
+# test files
+# --------------------------------------------------------------------
+# All the test files copy from source directory to test directory
+# NOTE: Keep this framework to add/remove test files.
+#       Any test files from other tools can be used in this framework.
+#       This list are also used for checking exist.
+#       Comment '#' without space can be used.
+# --------------------------------------------------------------------
+LIST_HDF5_TEST_FILES="
+$SRC_H5DIFF_TESTFILES/tudfilter.h5
+$SRC_H5DIFF_TESTFILES/tudfilter2.h5
+$SRC_H5DIFF_TESTFILES/h5diff_ud.txt
+$SRC_H5DIFF_TESTFILES/h5diff_udfail.txt
+"
+
+# Main Body
+# Create test directories if not exists yet.
+test -d $PLUGIN_LIBDIR || mkdir -p $PLUGIN_LIBDIR
+if [ $? != 0 ]; then
+    echo "Failed to create test directory($PLUGIN_LIBDIR)"
+    exit $EXIT_FAILURE
+fi
+
+# copy plugin library for test
+$CP $PLUGIN_LIB $PLUGIN_LIBDIR
+if [ $? != 0 ]; then
+    echo "Failed to copy plugin library ($PLUGIN_LIB) for test."
+    exit $EXIT_FAILURE
+fi
+
+# setup plugin path
+ENVCMD="env HDF5_PLUGIN_PATH=../${PLUGIN_LIBDIR}"
+
+#
+# copy test files and expected output files from source dirs to test dir
+#
+COPY_TESTFILES="$LIST_HDF5_TEST_FILES"
+
+COPY_TESTFILES_TO_TESTDIR()
+{
+    # copy test files. Used -f to make sure get a new copy
+    for tstfile in $COPY_TESTFILES
+    do
+        # ignore '#' comment
+        echo $tstfile | tr -d ' ' | grep '^#' > /dev/null
+        RET=$?
+        if [ $RET -eq 1 ]; then
+            # skip cp if srcdir is same as destdir
+            # this occurs when build/test performed in source dir and
+            # make cp fail
+            SDIR=`$DIRNAME $tstfile`
+            INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
+            INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
+            if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
+              $CP -f $tstfile $TESTDIR
+                if [ $? -ne 0 ]; then
+                    echo "Error: FAILED to copy $tstfile ."
+
+                    # Comment out this to CREATE expected file
+                    exit $EXIT_FAILURE
+                fi
+            fi
+        fi
+    done
+}
+
+CLEAN_TESTFILES_AND_TESTDIR()
+{
+    # skip rm if srcdir is same as destdir
+    # this occurs when build/test performed in source dir and
+    # make cp fail
+    SDIR=$SRC_H5DIFF_TESTFILES
+    INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
+    INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
+    if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
+        $RM $TESTDIR
+    fi
+}
+
+# Parse option
+#   -p   run ph5diff tests
+#   -h   print help page
+while [ $# -gt 0 ]; do
+    case "$1" in
+    -p)	# reset the tool name and bin to run ph5diff tests
+	TESTNAME=ph5diff
+	H5DIFF=ph5diff               # The tool name
+	H5DIFF_BIN=`pwd`/$H5DIFF
+	pmode=yes
+	shift
+	;;
+    -h) # print help page
+    echo "$0 [-p] [-h]"
+    echo "    -p   run ph5diff tests"
+    echo "    -h   print help page"
+    shift
+    exit 0
+    ;;
+    *)  # unknown option
+        echo "$0: Unknown option ($1)"
+    exit 1
+    ;;
+    esac
+done
+
+# RUNSERIAL is used. Check if it can return exit code from executalbe correctly.
+if [ -n "$RUNSERIAL_NOEXITCODE" ]; then
+    echo "***Warning*** Serial Exit Code is not passed back to shell corretly."
+    echo "***Warning*** Exit code checking is skipped."
+    h5haveexitcode=no
+fi
+
+# Print a line-line message left justified in a field of 70 characters
+# beginning with the word "Testing".
+#
+TESTING() {
+   SPACES="                                                               "
+   echo "Testing $* $SPACES" | cut -c1-70 | tr -d '\012'
+}
+
+# Source in the output filter function definitions.
+. $srcdir/../../bin/output_filter.sh
+
+# Run a test and print PASS or *FAIL*.  If a test fails then increment
+# the `nerrors' global variable and (if $verbose is set) display the
+# difference between the actual output and the expected output. The
+# expected output is given as the first argument to this function and
+# the actual output file is calculated by replacing the `.ddl' with
+# `.out'.  The actual output is not removed if $HDF5_NOCLEANUP has a
+# non-zero value.
+#
+# Need eval before the RUNCMD command because some machines like
+# AIX, has RUNPARALLEL in the style as
+#   MP_PROCS=3 MP_TASKS_PER_NODE=3 poe ./a.out
+# that throws the shell script off.
+#
+TOOLTEST() {
+    expect="$TESTDIR/$1"
+    actual="$TESTDIR/`basename $1 .txt`.out"
+    actual_err="$TESTDIR/`basename $1 .txt`.err"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+    shift
+    if test -n "$pmode"; then
+        RUNCMD=$RUNPARALLEL
+    else
+        RUNCMD=$RUNSERIAL
+    fi
+
+    # Run test.
+    TESTING $H5DIFF $@
+    (
+    #echo "#############################"
+    #echo "Expected output for '$H5DIFF $@'"
+    #echo "#############################"
+    cd $TESTDIR
+    eval $ENVCMD $RUNCMD $H5DIFF_BIN "$@"
+    ) >$actual 2>$actual_err
+    EXIT_CODE=$?
+    # save actual and actual_err in case they are needed later.
+    cp $actual $actual_sav
+    STDOUT_FILTER $actual
+    cp $actual_err $actual_err_sav
+    STDERR_FILTER $actual_err
+    cat $actual_err >> $actual
+    # don't add exit code check in pmode, as it causes failure. (exit code
+    # is from mpirun not tool)
+    # if any problem occurs relate to an exit code, it will be caught in
+    # serial mode, so the test is fullfilled.
+    if test $h5haveexitcode = 'yes' -a -z "$pmode"; then
+      echo "EXIT CODE: $EXIT_CODE" >> $actual
+    fi
+
+    if [ ! -f $expect ]; then
+        # Create the expect file if it doesn't yet exist.
+        echo " CREATED"
+        cp $actual $expect
+    elif $CMP $expect $actual; then
+        echo " PASSED"
+    elif test $h5haveexitcode = 'yes' -a -z "$pmode"; then
+        echo "*FAILED*"
+        echo "    Expected result ($expect) differs from actual result ($actual)"
+        nerrors="`expr $nerrors + 1`"
+        test yes = "$verbose" && $DIFF $expect $actual |sed 's/^/    /'
+    else
+        # parallel mode output are often of different ordering from serial
+        # output.  If the sorted expected and actual files compare the same,
+        # it is safe to assume the actual output match the expected file.
+        expect_sorted=expect_sorted
+        actual_sorted=actual_sorted
+        sort $expect -o $expect_sorted
+        sort $actual -o $actual_sorted
+        # remove "EXIT CODE:" line from expect file. test for exit code
+        # is done by serial mode.
+        grep -v "EXIT CODE:" $expect_sorted > $expect_sorted.noexit
+        mv $expect_sorted.noexit $expect_sorted
+    if $CMP $expect_sorted $actual_sorted; then
+        echo " PASSED"
+    else
+        echo "*FAILED*"
+        nerrors="`expr $nerrors + 1`"
+        if test yes = "$verbose"; then
+        echo "====Expected result ($expect_sorted) differs from actual result ($actual_sorted)"
+        $DIFF $expect_sorted $actual_sorted |sed 's/^/    /'
+        echo "====The actual output ($actual_sav)"
+        sed 's/^/    /' < $actual_sav
+        echo "====The actual stderr ($actual_err_sav)"
+        sed 's/^/    /' < $actual_err_sav
+        echo "====End of actual stderr ($actual_err_sav)"
+        echo ""
+        fi
+    fi
+    fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+      rm -f $actual $actual_err $actual_sav $actual_err_sav
+      rm -f $actual_sorted $expect_sorted
+    fi
+}
+
+##############################################################################
+###           T H E   T E S T S
+##############################################################################
+# prepare for test
+COPY_TESTFILES_TO_TESTDIR
+
+# Run the test
+TOOLTEST h5diff_ud.txt -v tudfilter.h5 tudfilter2.h5
+
+# print results
+if test $nerrors -ne 0 ; then
+    echo "$nerrors errors encountered"
+    exit_code=$EXIT_FAILURE
+else
+    echo "All Plugin API tests passed."
+    exit_code=$EXIT_SUCCESS
+fi
+
+# Clean up temporary files/directories
+CLEAN_TESTFILES_AND_TESTDIR
+
+# Clean up temporary files/directories and leave
+$RM $PLUGIN_LIBDIR
+
+exit $exit_code
diff --git a/tools/h5diff/testfiles/h5diff_ud.txt b/tools/h5diff/testfiles/h5diff_ud.txt
new file mode 100644
index 0000000..7c9bb5e
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_ud.txt
@@ -0,0 +1,11 @@
+
+file1     file2
+---------------------------------------
+    x      x    /              
+    x      x    /dynlib2       
+
+group  : </> and </>
+0 differences found
+dataset: </dynlib2> and </dynlib2>
+0 differences found
+EXIT CODE: 0
diff --git a/tools/h5diff/testfiles/h5diff_udfail.txt b/tools/h5diff/testfiles/h5diff_udfail.txt
new file mode 100644
index 0000000..7eb1155
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_udfail.txt
@@ -0,0 +1,12 @@
+
+file1     file2
+---------------------------------------
+    x      x    /              
+    x      x    /dynlib2       
+
+group  : </> and </>
+0 differences found
+dataset: </dynlib2> and </dynlib2>
+0 differences found
+warning: dataset </dynlib2> cannot be read, user defined filter is not available
+EXIT CODE: 2
diff --git a/tools/h5diff/testfiles/tudfilter.h5 b/tools/h5diff/testfiles/tudfilter.h5
new file mode 100644
index 0000000..a1f6d80
--- /dev/null
+++ b/tools/h5diff/testfiles/tudfilter.h5
diff --git a/tools/h5diff/testfiles/tudfilter2.h5 b/tools/h5diff/testfiles/tudfilter2.h5
new file mode 100644
index 0000000..a1f6d80
--- /dev/null
+++ b/tools/h5diff/testfiles/tudfilter2.h5
diff --git a/tools/h5diff/testh5diff.sh.in b/tools/h5diff/testh5diff.sh.in
index 3be0b80..5748128 100644
--- a/tools/h5diff/testh5diff.sh.in
+++ b/tools/h5diff/testh5diff.sh.in
@@ -331,10 +331,10 @@ COPY_TESTFILES_TO_TESTDIR()
             INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
             INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
             if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
-    	        $CP -f $tstfile $TESTDIR
+              $CP -f $tstfile $TESTDIR
                 if [ $? -ne 0 ]; then
                     echo "Error: FAILED to copy $tstfile ."
-                
+
                     # Comment out this to CREATE expected file
                     exit $EXIT_FAILURE
                 fi
@@ -348,7 +348,7 @@ CLEAN_TESTFILES_AND_TESTDIR()
     # skip rm if srcdir is same as destdir
     # this occurs when build/test performed in source dir and
     # make cp fail
-    SDIR=`$DIRNAME $tstfile`
+    SDIR=$SRC_H5DIFF_TESTFILES
     INODE_SDIR=`$LS -i -d $SDIR | $AWK -F' ' '{print $1}'`
     INODE_DDIR=`$LS -i -d $TESTDIR | $AWK -F' ' '{print $1}'`
     if [ "$INODE_SDIR" != "$INODE_DDIR" ]; then
@@ -369,16 +369,16 @@ while [ $# -gt 0 ]; do
 	shift
 	;;
     -h) # print help page
-	echo "$0 [-p] [-h]"
-	echo "    -p   run ph5diff tests"
-	echo "    -h   print help page"
-	shift
-	exit 0
-	;;
+    echo "$0 [-p] [-h]"
+    echo "    -p   run ph5diff tests"
+    echo "    -h   print help page"
+    shift
+    exit 0
+    ;;
     *)  # unknown option
         echo "$0: Unknown option ($1)"
-	exit 1
-	;;
+    exit 1
+    ;;
     esac
 done
 
@@ -429,11 +429,11 @@ TOOLTEST() {
     # Run test.
     TESTING $H5DIFF $@
     (
-	#echo "#############################"
-	#echo "Expected output for '$H5DIFF $@'" 
-	#echo "#############################"
-	cd $TESTDIR
-	eval $RUNCMD $H5DIFF_BIN "$@"
+    #echo "#############################"
+    #echo "Expected output for '$H5DIFF $@'"
+    #echo "#############################"
+    cd $TESTDIR
+    eval $RUNCMD $H5DIFF_BIN "$@"
     ) >$actual 2>$actual_err
     EXIT_CODE=$?
     # save actual and actual_err in case they are needed later.
@@ -442,9 +442,9 @@ TOOLTEST() {
     cp $actual_err $actual_err_sav
     STDERR_FILTER $actual_err
     cat $actual_err >> $actual
-    # don't add exit code check in pmode, as it causes failure. (exit code 
+    # don't add exit code check in pmode, as it causes failure. (exit code
     # is from mpirun not tool)
-    # if any problem occurs relate to an exit code, it will be caught in 
+    # if any problem occurs relate to an exit code, it will be caught in
     # serial mode, so the test is fullfilled.
     if test $h5haveexitcode = 'yes' -a -z "$pmode"; then
       echo "EXIT CODE: $EXIT_CODE" >> $actual
@@ -462,7 +462,7 @@ TOOLTEST() {
         nerrors="`expr $nerrors + 1`"
         test yes = "$verbose" && $DIFF $expect $actual |sed 's/^/    /'
     else
-	    # parallel mode output are often of different ordering from serial
+        # parallel mode output are often of different ordering from serial
         # output.  If the sorted expected and actual files compare the same,
         # it is safe to assume the actual output match the expected file.
         expect_sorted=expect_sorted
@@ -473,44 +473,44 @@ TOOLTEST() {
         # is done by serial mode.
         grep -v "EXIT CODE:" $expect_sorted > $expect_sorted.noexit
         mv $expect_sorted.noexit $expect_sorted
-	if $CMP $expect_sorted $actual_sorted; then
-	    echo " PASSED"
-	else
-	    echo "*FAILED*"
-	    nerrors="`expr $nerrors + 1`"
-	    if test yes = "$verbose"; then
-		echo "====Expected result ($expect_sorted) differs from actual result ($actual_sorted)"
-		$DIFF $expect_sorted $actual_sorted |sed 's/^/    /'
-		echo "====The actual output ($actual_sav)"
-		sed 's/^/    /' < $actual_sav 
-		echo "====The actual stderr ($actual_err_sav)"
-		sed 's/^/    /' < $actual_err_sav 
-		echo "====End of actual stderr ($actual_err_sav)"
-		echo ""
-	    fi
-	fi
+    if $CMP $expect_sorted $actual_sorted; then
+        echo " PASSED"
+    else
+        echo "*FAILED*"
+        nerrors="`expr $nerrors + 1`"
+        if test yes = "$verbose"; then
+        echo "====Expected result ($expect_sorted) differs from actual result ($actual_sorted)"
+        $DIFF $expect_sorted $actual_sorted |sed 's/^/    /'
+        echo "====The actual output ($actual_sav)"
+        sed 's/^/    /' < $actual_sav
+        echo "====The actual stderr ($actual_err_sav)"
+        sed 's/^/    /' < $actual_err_sav
+        echo "====End of actual stderr ($actual_err_sav)"
+        echo ""
+        fi
+    fi
     fi
 
     # Clean up output file
     if test -z "$HDF5_NOCLEANUP"; then
-	    rm -f $actual $actual_err $actual_sav $actual_err_sav
-    	rm -f $actual_sorted $expect_sorted
+      rm -f $actual $actual_err $actual_sav $actual_err_sav
+      rm -f $actual_sorted $expect_sorted
     fi
 }
 
 
 # Print a "SKIP" message
 SKIP() {
-	 TESTING $H5DIFF $@
-	  echo  " -SKIP-"
+   TESTING $H5DIFF $@
+    echo  " -SKIP-"
 }
 
 
 
 ##############################################################################
-# The tests 
+# The tests
 # To avoid the printing of the complete full path of the test file, that hides
-# all the other parameters for long paths, the printing of the command line 
+# all the other parameters for long paths, the printing of the command line
 # is done first in
 # TESTING with the name only of the test file $TOOL, not its full path $TESTFILE
 ##############################################################################
@@ -525,13 +525,13 @@ COPY_TESTFILES_TO_TESTDIR
 TOOLTEST h5diff_10.txt -h
 
 # 1.1 normal mode
-TOOLTEST h5diff_11.txt  h5diff_basic1.h5 h5diff_basic2.h5 
+TOOLTEST h5diff_11.txt  h5diff_basic1.h5 h5diff_basic2.h5
 
 # 1.2 normal mode with objects
 TOOLTEST h5diff_12.txt  h5diff_basic1.h5 h5diff_basic2.h5  g1/dset1 g1/dset2
 
 # 1.3 report mode
-TOOLTEST h5diff_13.txt -r h5diff_basic1.h5 h5diff_basic2.h5 
+TOOLTEST h5diff_13.txt -r h5diff_basic1.h5 h5diff_basic2.h5
 
 # 1.4 report  mode with objects
 TOOLTEST h5diff_14.txt  -r h5diff_basic1.h5 h5diff_basic2.h5 g1/dset1 g1/dset2
@@ -549,7 +549,7 @@ TOOLTEST h5diff_16_2.txt --verbose --relative=0.02 h5diff_basic1.h5 h5diff_basic
 TOOLTEST h5diff_16_3.txt -v -p 0.02 h5diff_basic1.h5 h5diff_basic1.h5 g1/dset9 g1/dset10
 
 # 1.7 verbose mode
-TOOLTEST h5diff_17.txt -v h5diff_basic1.h5 h5diff_basic2.h5   
+TOOLTEST h5diff_17.txt -v h5diff_basic1.h5 h5diff_basic2.h5
 
 # 1.7 test 32-bit INFINITY
 TOOLTEST h5diff_171.txt -v h5diff_basic1.h5 h5diff_basic1.h5 /g1/fp19 /g1/fp19_COPY
@@ -557,8 +557,8 @@ TOOLTEST h5diff_171.txt -v h5diff_basic1.h5 h5diff_basic1.h5 /g1/fp19 /g1/fp19_C
 # 1.7 test 64-bit INFINITY
 TOOLTEST h5diff_172.txt -v h5diff_basic1.h5 h5diff_basic1.h5 /g1/fp20 /g1/fp20_COPY
 
-# 1.8 quiet mode 
-TOOLTEST h5diff_18.txt -q h5diff_basic1.h5 h5diff_basic2.h5 
+# 1.8 quiet mode
+TOOLTEST h5diff_18.txt -q h5diff_basic1.h5 h5diff_basic2.h5
 
 # 1.8 -v and -q
 TOOLTEST h5diff_18_1.txt -v -q h5diff_basic1.h5 h5diff_basic2.h5
@@ -588,7 +588,7 @@ TOOLTEST h5diff_23.txt -v h5diff_types.h5 h5diff_types.h5 g1 g1
 TOOLTEST h5diff_24.txt -v h5diff_types.h5 h5diff_types.h5 t1 t1
 
 # 2.5
-TOOLTEST h5diff_25.txt -v h5diff_types.h5 h5diff_types.h5 l1 l1 
+TOOLTEST h5diff_25.txt -v h5diff_types.h5 h5diff_types.h5 l1 l1
 
 # 2.6
 TOOLTEST h5diff_26.txt -v h5diff_types.h5 h5diff_types.h5 g1 g2
@@ -642,7 +642,7 @@ TOOLTEST h5diff_57.txt -v h5diff_dtypes.h5 h5diff_dtypes.h5 dset7a dset7b
 # 5.8 (region reference)
 TOOLTEST h5diff_58.txt -v h5diff_dset1.h5 h5diff_dset2.h5 refreg
 
-# test for both dset and attr with same type but with different size 
+# test for both dset and attr with same type but with different size
 # ( HDDFV-7942 )
 TOOLTEST h5diff_59.txt -v h5diff_dtypes.h5 h5diff_dtypes.h5 dset11a dset11b
 
@@ -652,14 +652,14 @@ TOOLTEST h5diff_59.txt -v h5diff_dtypes.h5 h5diff_dtypes.h5 dset11a dset11b
 
 
 # 6.0: Check if the command line number of arguments is less than 3
-TOOLTEST h5diff_600.txt h5diff_basic1.h5 
+TOOLTEST h5diff_600.txt h5diff_basic1.h5
 
-# 6.1: Check if non-exist object name is specified 
+# 6.1: Check if non-exist object name is specified
 TOOLTEST h5diff_601.txt h5diff_basic1.h5 h5diff_basic1.h5 nono_obj
 
 
 # ##############################################################################
-# # -d 
+# # -d
 # ##############################################################################
 
 
@@ -678,7 +678,7 @@ TOOLTEST h5diff_606.txt -d 0x1 h5diff_basic1.h5 h5diff_basic2.h5 g1/dset3 g1/dse
 # 6.7: string
 TOOLTEST h5diff_607.txt -d "1" h5diff_basic1.h5 h5diff_basic2.h5 g1/dset3 g1/dset4
 
-# 6.8: use system epsilon 
+# 6.8: use system epsilon
 TOOLTEST h5diff_608.txt --use-system-epsilon h5diff_basic1.h5 h5diff_basic2.h5  g1/dset3 g1/dset4
 
 # 6.9: number larger than biggest difference
@@ -762,7 +762,7 @@ TOOLTEST h5diff_631.txt -v --use-system-epsilon h5diff_basic1.h5 h5diff_basic1.h
 # ##############################################################################
 # 7.  attributes
 # ##############################################################################
-TOOLTEST h5diff_70.txt -v h5diff_attr1.h5 h5diff_attr2.h5 
+TOOLTEST h5diff_70.txt -v h5diff_attr1.h5 h5diff_attr2.h5
 # temporary test to verify HDF5-8625
 TOOLTEST h5diff_tmp1.txt tmptest2.he5 tmptest.he5
 # temporary test to verify HDF5-8639
@@ -772,10 +772,10 @@ TOOLTEST h5diff_tmp2.txt tmpSingleSiteBethe.output.h5 tmpSingleSiteBethe.referen
 #  attrs with verbose option level
 # ##################################################
 
-TOOLTEST h5diff_700.txt -v1 h5diff_attr1.h5 h5diff_attr2.h5 
-TOOLTEST h5diff_701.txt -v2 h5diff_attr1.h5 h5diff_attr2.h5 
-TOOLTEST h5diff_702.txt --verbose=1 h5diff_attr1.h5 h5diff_attr2.h5 
-TOOLTEST h5diff_703.txt --verbose=2 h5diff_attr1.h5 h5diff_attr2.h5 
+TOOLTEST h5diff_700.txt -v1 h5diff_attr1.h5 h5diff_attr2.h5
+TOOLTEST h5diff_701.txt -v2 h5diff_attr1.h5 h5diff_attr2.h5
+TOOLTEST h5diff_702.txt --verbose=1 h5diff_attr1.h5 h5diff_attr2.h5
+TOOLTEST h5diff_703.txt --verbose=2 h5diff_attr1.h5 h5diff_attr2.h5
 
 # same attr number , all same attr name
 TOOLTEST h5diff_704.txt -v2 h5diff_attr_v_level1.h5 h5diff_attr_v_level2.h5 /g
@@ -789,7 +789,7 @@ TOOLTEST h5diff_706.txt -v2 h5diff_attr_v_level1.h5 h5diff_attr_v_level2.h5 /nty
 # different attr number , same attr name (intersected)
 TOOLTEST h5diff_707.txt -v2 h5diff_attr_v_level1.h5 h5diff_attr_v_level2.h5 /g2
 
-# different attr number , all different attr name 
+# different attr number , all different attr name
 TOOLTEST h5diff_708.txt -v2 h5diff_attr_v_level1.h5 h5diff_attr_v_level2.h5 /g3
 
 # when no attributes exist in both objects
@@ -801,32 +801,32 @@ TOOLTEST h5diff_710.txt -v2 h5diff_attr_v_level1.h5 h5diff_attr_v_level2.h5
 # ##############################################################################
 # 8.  all dataset datatypes
 # ##############################################################################
-TOOLTEST h5diff_80.txt -v h5diff_dset1.h5 h5diff_dset2.h5 
+TOOLTEST h5diff_80.txt -v h5diff_dset1.h5 h5diff_dset2.h5
 
 # 9. compare a file with itself
 TOOLTEST h5diff_90.txt -v h5diff_basic2.h5 h5diff_basic2.h5
 
 # 10. read by hyperslab, print indexes
-TOOLTEST h5diff_100.txt -v h5diff_hyper1.h5 h5diff_hyper2.h5 
+TOOLTEST h5diff_100.txt -v h5diff_hyper1.h5 h5diff_hyper2.h5
 
 # 11. floating point comparison
 # double value
-TOOLTEST h5diff_101.txt -v h5diff_basic1.h5 h5diff_basic1.h5 g1/d1  g1/d2 
+TOOLTEST h5diff_101.txt -v h5diff_basic1.h5 h5diff_basic1.h5 g1/d1  g1/d2
 
 # float value
-TOOLTEST h5diff_102.txt -v h5diff_basic1.h5 h5diff_basic1.h5 g1/fp1 g1/fp2 
+TOOLTEST h5diff_102.txt -v h5diff_basic1.h5 h5diff_basic1.h5 g1/fp1 g1/fp2
 
-# with --use-system-epsilon for double value 
-TOOLTEST h5diff_103.txt -v --use-system-epsilon h5diff_basic1.h5 h5diff_basic1.h5 g1/d1  g1/d2 
+# with --use-system-epsilon for double value
+TOOLTEST h5diff_103.txt -v --use-system-epsilon h5diff_basic1.h5 h5diff_basic1.h5 g1/d1  g1/d2
 
 # with --use-system-epsilon for float value
-TOOLTEST h5diff_104.txt -v --use-system-epsilon h5diff_basic1.h5 h5diff_basic1.h5 g1/fp1 g1/fp2 
+TOOLTEST h5diff_104.txt -v --use-system-epsilon h5diff_basic1.h5 h5diff_basic1.h5 g1/fp1 g1/fp2
 
 
 # not comparable -c flag
-TOOLTEST h5diff_200.txt h5diff_basic2.h5 h5diff_basic2.h5 g2/dset1  g2/dset2 
+TOOLTEST h5diff_200.txt h5diff_basic2.h5 h5diff_basic2.h5 g2/dset1  g2/dset2
 
-TOOLTEST h5diff_201.txt -c h5diff_basic2.h5 h5diff_basic2.h5 g2/dset1  g2/dset2 
+TOOLTEST h5diff_201.txt -c h5diff_basic2.h5 h5diff_basic2.h5 g2/dset1  g2/dset2
 
 TOOLTEST h5diff_202.txt -c h5diff_basic2.h5 h5diff_basic2.h5 g2/dset2  g2/dset3
 
@@ -842,9 +842,9 @@ TOOLTEST h5diff_206.txt -c h5diff_basic2.h5 h5diff_basic2.h5 g2/dset7  g2/dset8
 TOOLTEST h5diff_207.txt -c h5diff_basic2.h5 h5diff_basic2.h5 g2/dset8  g2/dset9
 
 # not comparable in dataspace of zero dimension size
-TOOLTEST h5diff_208.txt -c h5diff_dset_zero_dim_size1.h5 h5diff_dset_zero_dim_size2.h5 
+TOOLTEST h5diff_208.txt -c h5diff_dset_zero_dim_size1.h5 h5diff_dset_zero_dim_size2.h5
 
-# non-comparable dataset with comparable attribute, and other comparable datasets. 
+# non-comparable dataset with comparable attribute, and other comparable datasets.
 # Also test non-compatible attributes with different type, dimention, rank.
 # All the comparables should display differences.
 TOOLTEST h5diff_220.txt -c non_comparables1.h5 non_comparables2.h5 /g1
@@ -862,7 +862,7 @@ TOOLTEST h5diff_222.txt -c non_comparables1.h5 non_comparables2.h5
 TOOLTEST h5diff_223.txt -c non_comparables1.h5 non_comparables2.h5 /diffobjtypes
 # swap files
 TOOLTEST h5diff_224.txt -c non_comparables2.h5 non_comparables1.h5 /diffobjtypes
-    
+
 # ##############################################################################
 # # Links compare without --follow-symlinks nor --no-dangling-links
 # ##############################################################################
@@ -958,28 +958,28 @@ TOOLTEST h5diff_425.txt --follow-symlinks -v h5diff_ext2softlink_src.h5 h5diff_e
 TOOLTEST h5diff_450.txt  --follow-symlinks -v h5diff_danglelinks1.h5 h5diff_danglelinks2.h5
 
 # dangling links --follow-symlinks and --no-dangling-links (FILE to FILE)
-TOOLTEST h5diff_451.txt  --follow-symlinks -v --no-dangling-links  h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 
+TOOLTEST h5diff_451.txt  --follow-symlinks -v --no-dangling-links  h5diff_danglelinks1.h5 h5diff_danglelinks2.h5
 
 # try --no-dangling-links without --follow-symlinks options
 TOOLTEST h5diff_452.txt  --no-dangling-links  h5diff_softlinks.h5 h5diff_softlinks.h5
 
 # dangling link found for soft links (FILE to FILE)
-TOOLTEST h5diff_453.txt  --follow-symlinks -v --no-dangling-links  h5diff_softlinks.h5 h5diff_softlinks.h5  
+TOOLTEST h5diff_453.txt  --follow-symlinks -v --no-dangling-links  h5diff_softlinks.h5 h5diff_softlinks.h5
 
 # dangling link found for soft links (obj to obj)
-TOOLTEST h5diff_454.txt  --follow-symlinks -v --no-dangling-links  h5diff_softlinks.h5 h5diff_softlinks.h5 /softlink_dset2 /softlink_noexist 
+TOOLTEST h5diff_454.txt  --follow-symlinks -v --no-dangling-links  h5diff_softlinks.h5 h5diff_softlinks.h5 /softlink_dset2 /softlink_noexist
 
 # dangling link found for soft links (obj to obj) Both dangle links
-TOOLTEST h5diff_455.txt  --follow-symlinks -v --no-dangling-links  h5diff_softlinks.h5 h5diff_softlinks.h5 /softlink_noexist /softlink_noexist 
+TOOLTEST h5diff_455.txt  --follow-symlinks -v --no-dangling-links  h5diff_softlinks.h5 h5diff_softlinks.h5 /softlink_noexist /softlink_noexist
 
 # dangling link found for ext links (FILE to FILE)
-TOOLTEST h5diff_456.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlink_src.h5 h5diff_extlink_src.h5 
+TOOLTEST h5diff_456.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlink_src.h5 h5diff_extlink_src.h5
 
 # dangling link found for ext links (obj to obj). target file exist
-TOOLTEST h5diff_457.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlink_src.h5 h5diff_extlink_src.h5 /ext_link_dset1 /ext_link_noexist1 
+TOOLTEST h5diff_457.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlink_src.h5 h5diff_extlink_src.h5 /ext_link_dset1 /ext_link_noexist1
 
 # dangling link found for ext links (obj to obj). target file NOT exist
-TOOLTEST h5diff_458.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlink_src.h5 h5diff_extlink_src.h5 /ext_link_dset1 /ext_link_noexist2  
+TOOLTEST h5diff_458.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlink_src.h5 h5diff_extlink_src.h5 /ext_link_dset1 /ext_link_noexist2
 
 # dangling link found for ext links (obj to obj). Both dangle links
 TOOLTEST h5diff_459.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlink_src.h5 h5diff_extlink_src.h5 /ext_link_noexist1 /ext_link_noexist2
@@ -993,14 +993,14 @@ TOOLTEST h5diff_466.txt -v --follow-symlinks h5diff_danglelinks1.h5 h5diff_dangl
 # soft link  vs. soft dangling
 TOOLTEST h5diff_467.txt -v --follow-symlinks h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /soft_link2
 # ext dangling vs. ext dangling
-TOOLTEST h5diff_468.txt -v --follow-symlinks h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /ext_link4 
+TOOLTEST h5diff_468.txt -v --follow-symlinks h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /ext_link4
 # ext link vs. ext dangling
 TOOLTEST h5diff_469.txt -v --follow-symlinks h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /ext_link2
 
 #----------------------------------------
-# dangling links without follow symlink 
+# dangling links without follow symlink
 # (HDFFV-7998)
-# test - soft dangle links (same and different paths), 
+# test - soft dangle links (same and different paths),
 #      - external dangle links (same and different paths)
 TOOLTEST h5diff_471.txt -v h5diff_danglelinks1.h5 h5diff_danglelinks2.h5
 TOOLTEST h5diff_472.txt -v h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /soft_link1
@@ -1011,7 +1011,7 @@ TOOLTEST h5diff_475.txt -v h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /ext_li
 # ##############################################################################
 # # test for group diff recursivly
 # ##############################################################################
-# root 
+# root
 TOOLTEST h5diff_500.txt -v h5diff_grp_recurse1.h5 h5diff_grp_recurse2.h5 / /
 TOOLTEST h5diff_501.txt -v --follow-symlinks h5diff_grp_recurse1.h5 h5diff_grp_recurse2.h5 / /
 
@@ -1045,7 +1045,7 @@ TOOLTEST h5diff_513.txt -v h5diff_grp_recurse1.h5 h5diff_grp_recurse2.h5 /slink_
 TOOLTEST h5diff_514.txt -v --follow-symlinks h5diff_grp_recurse1.h5 h5diff_grp_recurse2.h5 /slink_grp10 /slink_grp11
 
 ###############################################################################
-# Test for group recursive diff via multi-linked external links 
+# Test for group recursive diff via multi-linked external links
 # With follow-symlinks, file h5diff_grp_recurse_ext1.h5 and h5diff_grp_recurse_ext2-1.h5 should
 # be same with the external links.
 ###############################################################################
@@ -1068,7 +1068,7 @@ TOOLTEST h5diff_480.txt -v --exclude-path /group1/dset3 h5diff_exclude1-1.h5 h5d
 TOOLTEST h5diff_481.txt -v h5diff_exclude1-1.h5 h5diff_exclude1-2.h5
 
 #
-# Different structure, different names. 
+# Different structure, different names.
 #
 # Exclude all the different objects. Expect return - same
 TOOLTEST h5diff_482.txt -v --exclude-path "/group1" --exclude-path "/dset1" h5diff_exclude2-1.h5 h5diff_exclude2-2.h5
@@ -1099,9 +1099,9 @@ TOOLTEST h5diff_530.txt -v  h5diff_comp_vl_strs.h5 h5diff_comp_vl_strs.h5 /group
 TOOLTEST h5diff_540.txt -v compounds_array_vlen1.h5 compounds_array_vlen2.h5
 
 # ##############################################################################
-# # Test mutually exclusive options 
+# # Test mutually exclusive options
 # ##############################################################################
-# Test with -d , -p and --use-system-epsilon. 
+# Test with -d , -p and --use-system-epsilon.
 TOOLTEST h5diff_640.txt -v -d 5 -p 0.05 --use-system-epsilon h5diff_basic1.h5 h5diff_basic2.h5 /g1/dset3 /g1/dset4
 TOOLTEST h5diff_641.txt -v -d 5 -p 0.05 h5diff_basic1.h5 h5diff_basic2.h5 /g1/dset3 /g1/dset4
 TOOLTEST h5diff_642.txt -v -p 0.05 -d 5 h5diff_basic1.h5 h5diff_basic2.h5 /g1/dset3 /g1/dset4