[svn-r21892] Purpose:

  Fix for HDFFV-7836 h5diff: displays error stack message for comparing the two dangling symlink with follow-symlinks option

Description:
  While ago, to improve performance, skipping same object checking 
  (h5tools_is_obj_same()) was added. 
  However the checking function doesn't understand about the dangling link and
  caused the issue. 
  Since handling dangling link code section already implemented, move the 
  checking function after handling dangling-links to address the problem.
  Test was added and tagged with jira#.

Tested:
  jam (linux32-LE), koala (linux64-LE), ostrich (linuxppc64-BE), tejeda (mac32-LE), linew (solaris-BE),  Windows (32-LE cmake), Cmake (jam)

4 files changed, 26 insertions, 11 deletions

diff --git a/tools/h5diff/CMakeLists.txt b/tools/h5diff/CMakeLists.txt
index cbb5ed3..1fa1cf3 100644
--- a/tools/h5diff/CMakeLists.txt
+++ b/tools/h5diff/CMakeLists.txt
@@ -130,6 +130,7 @@ IF (BUILD_TESTING)
       h5diff_457.txt
       h5diff_458.txt
       h5diff_459.txt
+      h5diff_465.txt
       h5diff_480.txt
       h5diff_481.txt
       h5diff_482.txt
@@ -655,6 +656,8 @@ IF (BUILD_TESTING)
           h5diff_458.out.err
           h5diff_459.out
           h5diff_459.out.err
+          h5diff_465.out
+          h5diff_465.out.err
           h5diff_480.out
           h5diff_480.out.err
           h5diff_481.out
@@ -1262,6 +1265,10 @@ ADD_H5_TEST (h5diff_458 2  --follow-symlinks -v --no-dangling-links  ${FILE15} $
 # dangling link found for ext links (obj to obj). Both dangle links
 ADD_H5_TEST (h5diff_459 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_noexist1 /ext_link_noexist2)
 
+# dangling link --follow-symlinks (obj vs obj)
+# (HDFFV-7836)
+ADD_H5_TEST (h5diff_465 1 --follow-symlinks h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /soft_link1)
+
 # ##############################################################################
 # # test for group diff recursivly
 # ##############################################################################
diff --git a/tools/h5diff/testfiles/h5diff_465.txt b/tools/h5diff/testfiles/h5diff_465.txt
new file mode 100644
index 0000000..827e88e
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_465.txt
@@ -0,0 +1,2 @@
+1 differences found
+EXIT CODE: 1
diff --git a/tools/h5diff/testh5diff.sh b/tools/h5diff/testh5diff.sh
index 8de12a5..aa0f502 100755
--- a/tools/h5diff/testh5diff.sh
+++ b/tools/h5diff/testh5diff.sh
@@ -200,6 +200,7 @@ $SRC_H5DIFF_TESTFILES/h5diff_456.txt
 $SRC_H5DIFF_TESTFILES/h5diff_457.txt
 $SRC_H5DIFF_TESTFILES/h5diff_458.txt
 $SRC_H5DIFF_TESTFILES/h5diff_459.txt
+$SRC_H5DIFF_TESTFILES/h5diff_465.txt
 $SRC_H5DIFF_TESTFILES/h5diff_480.txt
 $SRC_H5DIFF_TESTFILES/h5diff_481.txt
 $SRC_H5DIFF_TESTFILES/h5diff_482.txt
@@ -939,6 +940,9 @@ TOOLTEST h5diff_458.txt  --follow-symlinks -v --no-dangling-links  h5diff_extlin
 # 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
 
+# dangling link --follow-symlinks (obj vs obj)
+# (HDFFV-7836)
+TOOLTEST h5diff_465.txt --follow-symlinks h5diff_danglelinks1.h5 h5diff_danglelinks2.h5 /soft_link1
 
 # ##############################################################################
 # # test for group diff recursivly
diff --git a/tools/lib/h5diff.c b/tools/lib/h5diff.c
index 6e9fee8..be20ed4 100644
--- a/tools/lib/h5diff.c
+++ b/tools/lib/h5diff.c
@@ -861,17 +861,6 @@ hsize_t h5diff(const char *fname1,
         HDstrcat(obj2fullname, "/");
     }
 
-   /* 
-    * If verbose options is used, need to traverse thorugh the list of objects 
-    * in the group to print out objects information.
-    * Use h5tools_is_obj_same() to improve performance by skipping 
-    * comparing details of same objects. 
-    */
-    if(!(options->m_verbose || options->m_report))
-    {
-        if (h5tools_is_obj_same(file1_id,obj1fullname,file2_id,obj2fullname)!=0)
-            goto out;
-    }
 
     /*---------------------------------------------
      * check for following symlinks 
@@ -949,6 +938,19 @@ hsize_t h5diff(const char *fname1,
             obj2type = trg_linfo2.trg_type;
     } /* end of if follow symlinks */
 
+   /* 
+    * If verbose options is not used, don't need to traverse thorugh the list 
+    * of objects in the group to display objects information,
+    * So use h5tools_is_obj_same() to improve performance by skipping 
+    * comparing details of same objects. 
+    */
+
+    if(!(options->m_verbose || options->m_report))
+    {
+        if (h5tools_is_obj_same(file1_id,obj1fullname,file2_id,obj2fullname)!=0)
+            goto out;
+    }
+
 
     /* if both obj1 and obj2 are group */
     if (obj1type == H5TRAV_TYPE_GROUP && obj2type == H5TRAV_TYPE_GROUP)