I just realized that if I limit the comparison to a specific dataset, h5diff 
exits with a 0 status even when "Some objects are not comparable".

To wit,

[dws@oxygen02 infrastructure]$ /usr/local/contrib/hdf5-1.8.8-par/bin/h5diff  -v 
unstructScalarGradient3ds_0.h5 
/scr1_oxygen/dws/jenkins/workspace/nautilusall-build/qarnodes/oxygen/nttests/ntresults-oxygen/infrastructure/unstructScalarGradient3ds/unstructScalarGradient3ds_0.h5
 /fluids/qnew
dataset: </fluids/qnew> and </fluids/qnew>
Not comparable: </fluids/qnew> has rank 2, dimensions [1000x3], max dimensions 
[1000x3]
and </fluids/qnew> has rank 2, dimensions [8000x3], max dimensions [8000x3]
attribute: <vsCentering of </fluids/qnew>> and <vsCentering of </fluids/qnew>>
0 differences found
attribute: <vsMesh of </fluids/qnew>> and <vsMesh of </fluids/qnew>>
0 differences found
attribute: <vsType of </fluids/qnew>> and <vsType of </fluids/qnew>>
0 differences found
0 differences found
--------------------------------
Some objects are not comparable
--------------------------------
Use -c for a list of objects without details of differences.
[dws@oxygen02 infrastructure]$ echo $?
0

Interestingly, if I don't limit the comparison to a specific dataset, h5diff 
has the correct exit status:

[dws@oxygen02 infrastructure]$ /usr/local/contrib/hdf5-1.8.8-par/bin/h5diff  -v 
unstructScalarGradient3ds_0.h5 
/scr1_oxygen/dws/jenkins/workspace/nautilusall-build/qarnodes/oxygen/nttests/ntresults-oxygen/infrastructure/unstructScalarGradient3ds/unstructScalarGradient3ds_0.h5
file1     file2
---------------------------------------
   x      x    /              
   x      x    /fluids        
   x      x    /fluids/domain 
   x      x    /fluids/error  
   x      x    /fluids/q      
   x      x    /fluids/qan    
   x      x    /fluids/qnew   
   x      x    /runInfo       
   x      x    /timeData      

...
108 differences found
attribute: <vsSoftware of </runInfo>> and <vsSoftware of </runInfo>>
0 differences found
attribute: <vsSwRevision of </runInfo>> and <vsSwRevision of </runInfo>>
0 differences found
attribute: <vsType of </runInfo>> and <vsType of </runInfo>>
0 differences found
group  : </timeData> and </timeData>
0 differences found
attribute: <vsStep of </timeData>> and <vsStep of </timeData>>
0 differences found
attribute: <vsTime of </timeData>> and <vsTime of </timeData>>
0 differences found
attribute: <vsType of </timeData>> and <vsType of </timeData>>
0 differences found
--------------------------------
Some objects are not comparable
--------------------------------
Use -c for a list of objects without details of differences.
[dws@oxygen02 infrastructure]$ echo $?
1

Dave
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