Description of problem: If hdf5-openmpi is installed cmake does not detect that this parallel build of hdf5 was installed (HDF5_IS_PARALLEL returns False). Version-Release number of selected component (if applicable): Name : hdf5-openmpi Arch : x86_64 Epoch : 0 Version : 1.8.13 Release : 6.fc21 How reproducible: Always Steps to Reproduce: 1. install hdf5-openmpi 2. create a CMakeLists.txt file with this content cmake_minimum_required(VERSION 3.0) find_package(HDF5) message(STATUS "includes: ${HDF5_INCLUDE_DIRS}") message(STATUS "par is: ${HDF5_IS_PARALLEL}") message(STATUS "par enable: ${HDF5_ENABLE_PARALLEL}") 3. run cmake . 4. observe that HDF5_IS_PARALLEL is False Actual results: Expected results: Additional info: I fixed this problem locally by adding /usr/include/openmpi-x86_64 to HDF_INCLUDE_DIRS in FindHDF5.cmake
There is an additional problem with the FindHDF5.cmake file: The first entry of the HDF5_LIBRARIES list points to the 'serial' hdf5 lib (/usr/lib64/libhdf5.so) instead of the parallel one (/usr/lib64/mpich/lib/libhdf5.so or /usr/lib64/openmpi/lib/libhdf5.so). BTW what shared library should be used if both hdf5-openmpi and hdf5-mpich are installed?
So, the way Fedora packages MPI is quite particular to Fedora itself. The FindHDF in cmake is fairly generic. I think what we need to do is move to building HDF5 with cmake so we can use the provided HDF5 cmake config - see bug 919623.
Debian uses /etc/alternatives for its mpi packages. It would probably make things a lot easier if /etc/alternatives is used for the mpi packages in fedora as well.
Alternatives are system wide. Modules allow for per-user configuration.
I've just found https://bugzilla.redhat.com/show_bug.cgi?id=537892, where it was mentioned that /etc/alterneratives was abandoned in favor of 'environment-modules'. I'll try to find out more about those modules.
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