[Users] HDF5 and C++

[Kelly, Bernard J. (GSFC-660.0)[UNIVERSITY OF MARYLAND BALTIMORE COUNTY]]

Hi Erik.

Both John and I are compiling with HDF5_DIR=BUILD. We're using the latest
available macports version of openmpi. This is exactly what gives the
"incompatible --enable-cxx" error message John mentioned in his report.

Bernard

On 12/9/10 12:16 PM, "Erik Schnetter" <schnetter at cct.lsu.edu> wrote:

>On Thu, Dec 9, 2010 at 5:04 PM, John Baker <john.g.baker at nasa.gov> wrote:
>> Hi,
>>     There was some discussion of HDF5 and c++ recently on
>> this list (See:
>> 
>>http://lists.einsteintoolkit.org/pipermail/users/2010-September/000515.ht
>>ml
>> ). And also on the trac list in October.
>> In relation to these, our group has been having several problems
>> related to HDF5 and c++ recently.
>>      On many of the production environments where we run, there is no
>> hdf5 build available which includes cpp support.  In particular a build
>> failed when searching for libhdf5_hl_cpp.   We worked around this by
>> removing these libraries from the list in
>> ExternalLibraries/HDF5/HDF5.sh.  This seemed to work, but required our
>> hacking the repository version of the code and presumably could cause a
>> failure with any thorns needing HDF5 C++ support.
>>     At the same time (actually going back to the first ETK release) I
>> have had difficulty compiling on MacOS, (the macports hdf5-18 doesn't
>> support fortran or c++ with openmpi).  I don't generally need hdf5 when
>> I'm doing development on my laptop, but it would be good to have it
>> working.  I recently tried using the HDF5=BUILD option on Mac, but this
>> seemed to lead to the same problem in different form.  The HDF5
>> configuration failed with a complaint that --enable-cxx was incompatible
>> with MPI compilers.
>>     Getting to the point now, I have some questions:
>>
>> 1. Is there a good reason why HDF5 needs the C++ libraries in Cactus?
>> 2. Does hdf5 1.8.5 even support the c++ interface?
>> 3. What should we be doing differently to work around these issues?
>
>John
>
>Yes, we have source code that calls HDF5 from C++, and also code that
>calls HDF5 from Fortran. We therefore use HDF5 with both C++ and
>Fortran interfaces enabled. At the same time we build only the serial
>version, because the parallel version does not support the C++
>interface (for whatever reason).
>
>If the system HDF5 library is not good enough, then this should be
>auto-detected, and Cactus should build HDF5 on its own. You can also
>specify this manually with HDF5=BUILD. This should work -- this is our
>catch-all fallback solution and is supposed to be very robust (except
>on systems where the HDF5 configure-make-make install steps don't
>work).
>
>Your problems read as if you tried to build a parallel version of
>HDF5. This should not happen on its own. Did you enable that yourself?
>
>-erik
>
>-- 
>Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/
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