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[netCDF #AJV-500600]: Missing -ldl library when using hdf5-1.8.11 with netcdf-4.3.0 and configure

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