[svn-r22320] Purpose:

  Fix for HDFFV-7998-h5diff: incorrect behavior and output for comparing symbolic dangling links without following-symlinks option 

Description:
  Fix not to check and display dangling link status without --follow-symlinks option.
  Berfor the fix, when comparing symbolic link to symbolic link without follow-symlinks option, h5diff followed to check if those links are dangling or not. It caused to display output incorrectly (dangling link instead of symbolic link).
  
  The fix also improved performance when comparing lots of symbolic links without the --follow-symlinks option.
  Test cases were added and tagged with jira#.
  This merged from HDF5 trunk r22319.

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

9 files changed, 55 insertions, 0 deletions

diff --git a/tools/h5diff/testfiles/h5diff_450.txt b/tools/h5diff/testfiles/h5diff_450.txt
index bf4f6e9..a63d78f 100644
--- a/tools/h5diff/testfiles/h5diff_450.txt
+++ b/tools/h5diff/testfiles/h5diff_450.txt
@@ -11,6 +11,7 @@ file1     file2
     x      x    /soft_link1    
     x      x    /soft_link2    
     x      x    /soft_link3    
+    x      x    /soft_link4    
 
 group  : </> and </>
 0 differences found
@@ -32,4 +33,6 @@ obj2 </soft_link2> is a dangling link.
 1 differences found
 obj1 </soft_link3> is a dangling link.
 1 differences found
+dangling link: </soft_link4> and </soft_link4>
+0 differences found
 EXIT CODE: 1
diff --git a/tools/h5diff/testfiles/h5diff_451.txt b/tools/h5diff/testfiles/h5diff_451.txt
index 0d30023..fd0691f 100644
--- a/tools/h5diff/testfiles/h5diff_451.txt
+++ b/tools/h5diff/testfiles/h5diff_451.txt
@@ -11,6 +11,7 @@ file1     file2
     x      x    /soft_link1    
     x      x    /soft_link2    
     x      x    /soft_link3    
+    x      x    /soft_link4    
 
 group  : </> and </>
 0 differences found
@@ -25,4 +26,5 @@ Warning: </ext_link4> is a dangling link.
 Warning: </soft_link1> is a dangling link.
 Warning: </soft_link2> is a dangling link.
 Warning: </soft_link3> is a dangling link.
+Warning: </soft_link4> is a dangling link.
 EXIT CODE: 2
diff --git a/tools/h5diff/testfiles/h5diff_471.txt b/tools/h5diff/testfiles/h5diff_471.txt
new file mode 100644
index 0000000..124cdd7
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_471.txt
@@ -0,0 +1,38 @@
+
+file1     file2
+---------------------------------------
+    x      x    /              
+    x      x    /dset1         
+    x      x    /dset2         
+    x      x    /ext_link1     
+    x      x    /ext_link2     
+    x      x    /ext_link3     
+    x      x    /ext_link4     
+    x      x    /soft_link1    
+    x      x    /soft_link2    
+    x      x    /soft_link3    
+    x      x    /soft_link4    
+
+group  : </> and </>
+0 differences found
+dataset: </dset1> and </dset1>
+0 differences found
+dataset: </dset2> and </dset2>
+0 differences found
+external link: </ext_link1> and </ext_link1>
+1 differences found
+external link: </ext_link2> and </ext_link2>
+1 differences found
+external link: </ext_link3> and </ext_link3>
+1 differences found
+external link: </ext_link4> and </ext_link4>
+0 differences found
+link   : </soft_link1> and </soft_link1>
+0 differences found
+link   : </soft_link2> and </soft_link2>
+1 differences found
+link   : </soft_link3> and </soft_link3>
+1 differences found
+link   : </soft_link4> and </soft_link4>
+1 differences found
+EXIT CODE: 1
diff --git a/tools/h5diff/testfiles/h5diff_472.txt b/tools/h5diff/testfiles/h5diff_472.txt
new file mode 100644
index 0000000..57a8af4
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_472.txt
@@ -0,0 +1,3 @@
+link   : </soft_link1> and </soft_link1>
+0 differences found
+EXIT CODE: 0
diff --git a/tools/h5diff/testfiles/h5diff_473.txt b/tools/h5diff/testfiles/h5diff_473.txt
new file mode 100644
index 0000000..4c1855d
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_473.txt
@@ -0,0 +1,3 @@
+link   : </soft_link4> and </soft_link4>
+1 differences found
+EXIT CODE: 1
diff --git a/tools/h5diff/testfiles/h5diff_474.txt b/tools/h5diff/testfiles/h5diff_474.txt
new file mode 100644
index 0000000..7807551
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_474.txt
@@ -0,0 +1,3 @@
+external link: </ext_link4> and </ext_link4>
+0 differences found
+EXIT CODE: 0
diff --git a/tools/h5diff/testfiles/h5diff_475.txt b/tools/h5diff/testfiles/h5diff_475.txt
new file mode 100644
index 0000000..be6110e
--- /dev/null
+++ b/tools/h5diff/testfiles/h5diff_475.txt
@@ -0,0 +1,3 @@
+external link: </ext_link1> and </ext_link1>
+1 differences found
+EXIT CODE: 1
diff --git a/tools/h5diff/testfiles/h5diff_danglelinks1.h5 b/tools/h5diff/testfiles/h5diff_danglelinks1.h5
index 8cbaac1..b8be9bc 100644
--- a/tools/h5diff/testfiles/h5diff_danglelinks1.h5
+++ b/tools/h5diff/testfiles/h5diff_danglelinks1.h5
diff --git a/tools/h5diff/testfiles/h5diff_danglelinks2.h5 b/tools/h5diff/testfiles/h5diff_danglelinks2.h5
index f634210..3c3907c 100644
--- a/tools/h5diff/testfiles/h5diff_danglelinks2.h5
+++ b/tools/h5diff/testfiles/h5diff_danglelinks2.h5