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Hi Russ:I have the snapshot of netcdf4 as of 2008031112. I am using the F90 interface (Intel Macbook pro, the gcc hat comes with Xcode and gfortran), and other than changing my prefix, I have done everything by default, except for including the szlib library in hdf5.. So given that, I have found:
1. A number of the examples for F90, in terms of the modules, only have
use netcdf
I found that this produces an error in my own code (the module was
found, so that is not the error), and programs would only compile if
both modules were used and in this order only:
use typesizes use netcdf2. In linking, I had to explicitly list netcdf, hdf_hl, hdf, z and sz as the libraries to link in, otherwise I would get an undefined reference.
I have already sent an email that how to do Vlen's in fortran is very unclear - somehow the data needs to be stuffed into a character buffer (what HDF fortran has done for awhile) but it is very unclear how to map data into the given calls. Groups and subgroups, and straightforward data puts so far are working fine.
HTH, -Roy On Apr 2, 2008, at 9:31 AM, Russ Rew wrote:
Hi Roy,I am finally getting a chance to look at the f90 interface to netcdf-4. I will use gfortran for compatibility. I am reading the Makefile correctly that I should use: gfortran -g -O2 and that libnetcdf libnetcdff and both hdf libs need to be linked in, or are the hdflibs already linked to libnetcdf? Is there a preferred order to the links?By default, you don't need libnetcdff, which is a separate Fortran library required only when you specify --enable-separate-fortran or --enable-shared flags to the configure script.The --enable-separate-fortran flag will cause the Fortran 77 and Fortran90 APIs to be built into a separate library, instead of being included in the C library. This is useful for supporting more than one Fortran compiler with the same netCDF C library. This is turned on by default for shared library builds.The --enable-shared flag will build shared libraries (as well as static)on platforms that support them. If you have enabled shared libraries or specified a separate Fortranlibrary, you should link with the Fortran library first, since it callsfunctions in the C library, as in -L/usr/local/netcdf -lnetcdff -lnetcdf Because the netCDF-4 library calls HDF5 functions, HDF5 libraries need to be specified after the netCDF library, as in-L/usr/local/netcdf -lnetcdff -lnetcdf -L/usr/local/hdf -lhdf5_hl -lhdf5This finds functions in both the HDF5 high-level library and the HDF5 core library, and the libraries should be mentioned in that order. It would be simpler if you define an environment variable or macro for the needed libraries, as you would do in a Makefile.Another approach is to define a customized compiler command (which mightbe an alias or a simple shell script) so you only have to get the location of the include files and libraries right once and can changethem in one place. We may eventually provide such a convenience commandif we can figure out how to make it flexible enough, analogous to the h5cc script included in HDF5 software.Eventually we would like to bundle the software to make linking simpler,but that will have to wait for a future release. --Russ
**********************"The contents of this message do not reflect any position of the U.S. Government or NOAA."
********************** Roy Mendelssohn Supervisory Operations Research Analyst NOAA/NMFS Environmental Research Division Southwest Fisheries Science Center 1352 Lighthouse Avenue Pacific Grove, CA 93950-2097 e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address) voice: (831)-648-9029 fax: (831)-648-8440 www: http://www.pfeg.noaa.gov/ "Old age and treachery will overcome youth and skill."
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