Re: [netcdfgroup] auto linking hdf5 libraries?

• To: Chris Webster <cjw@xxxxxxxx>
• Subject: Re: [netcdfgroup] auto linking hdf5 libraries?
• From: Russ Rew <russ@xxxxxxxxxxxxxxxx>
• Date: Thu, 08 Apr 2010 12:59:50 -0600

Hi Chris,

> So I notice that on some of my netCDF installations from RPMs if you 
> link against libnetcdf_c++ that it will automatically link to libnetcdf 
> also.  Would it be possible to get the same behavior from the hdf5 
> libraries when/if netCDF is being built against hdf5? 
> 
> My case for this is that software we distribute which depends upon 
> netCDF but not HDF5 does not know whether the target system has the HDF5 
> build of netCDF or not (sorry I am not sophisticated enough to use 
> autoconfig at this time).  So the user will have to tweak Makefile / 
> SConscript files to either add or delete the -lhdf5.
> 
> e.g. ncplot does not require hdf5, but when UWyo downloads the source 
> and builds they may have to tweak the Makefile for -lhdf5 depending on 
> which netCDF version they have.
> 
> So, is what I am asking for possible?  Am I making sense?

Dennis pointed out that if the target system was built from the latest
source with --enable-shared, then the shared netCDF library is supposed
to link to the HDF5 libraries, if needed.

However, using the nc-config utility may work for what you have in mind,
even if the target system has a static build of netCDF libraries.

Compile and link the Fortran application with something like:

 $(FC) `nc-config --fflags` myapp.f90 `nc-config --flibs`

where the particular options to this use of nc-config are

  --fflags  for the Fortran compiler options used

  --flibs   for the libraries needed to link against

--Russ

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  • [netcdfgroup] auto linking hdf5 libraries?
    • From: Chris Webster