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Greg, > I think the issue is related to the use of a static hdf5 and/or netcdf > library which is why it arises for you in the parallel case; I assume your > serial testing only uses shareable hdf5/netcdf libraries. > > In 1.8.11, hdf5 added the capability to use plugins which are dynamically > loaded. If linking with shareable libraries, then the -ldl is already > present due to the mechanisms of shareable libraries; however, if using > static libraries, the -ldl needs to be added manually which is not > currently being done in configure. Thanks for the explanation. We'll get that fixed in the next release. --Russ > --Greg > > On 6/5/13 2:37 PM, "Unidata netCDF Support" > <address@hidden> wrote: > > >Hi Greg, > > > >> When I try to use hdf5-1.8.11 with netcdf-4.3.0, the configure step > >>fails when looking for the hdf5 library. The configure test output is: > >> > >> configure:16229: gcc -o conftest -I../libsrc -O > >>-I/home/gdsjaar/src/SEACAS/inc -m64 -DBuild64 -Dlinux -DADDC_ -I./ > >> -I/home/gdsjaar/src/SEACAS/inc -fpic -DNDEBUG > >>-L/home/gdsjaar/src/SEACAS/lib -m64 conftest.c -lhdf5 -lm -lz >&5 > >> /home/gdsjaar/src/SEACAS/lib/libhdf5.a(H5PL.o): In function > >>`H5PL__close': > >> H5PL.c:(.text+0xd8): undefined reference to `dlclose' > >> /home/gdsjaar/src/SEACAS/lib/libhdf5.a(H5PL.o): In function `H5PL_load': > >> H5PL.c:(.text+0x3f2): undefined reference to `dlsym' > >> H5PL.c:(.text+0x71a): undefined reference to `dlopen' > >> H5PL.c:(.text+0x727): undefined reference to `dlerror' > >> H5PL.c:(.text+0x73b): undefined reference to `dlsym' > >> collect2: ld returned 1 exit status > >> configure:16229: $? = 1 > >> configure: failed program was: > >> > >> If I add ldl to the library list, it then links correctly. Do I need > >>to pass some different option to configure, or is hdf5-1.8.11 not yet > >>supported for use with netcdf-4.3.0 > > > >It's definitely supported, and we've been doing our testing with > >HDF5-1.8.11 since their > >first pre-release. I didn't notice the problem until I started doing > >some parallel > >testing, and I think it only occurs when linking with parallel > >hdf5-1.8.11. > > > >I documented it here: > > > > http://www.unidata.ucar.edu/netcdf/docs/build_parallel.html > > > >but I have never determined why "-ldl" is necessary. It might be a good > >question for > >the HDF Group, so I'm CC:ing them on this response. > > > >--Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: AJV-500600 Department: Support netCDF Priority: Normal Status: Closed