Re: 20020305: BOUNCE address@hidden

>To: address@hidden
>Subject: installing netCDF with Porland Group Compilers
>Date: Fri, 15 Mar 2002 17:08:27 -0500
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Hi Ryan,

> I am using netCDF on a Linux workstation, RH 7.2 o/s.  The netCDF program was 
> compiled using g77,gcc,g++ compilers. However, I have a fortran program that 
> tries to read a binary file that is > 2GB and write it's output in netCDF 
> format.  The program compiles, using g77, with no errors but when I run the 
> executable it crashes when it tries to read the > 2GB file.  ...

If you are *reading* a non-netCDF binary file when the crash occurs,
that doesn't sound like a netCDF problem.

Note that you can't write a netCDF file greater than
2GB unless:
 
 - You are running on a platform that has Large File Support (LFS)
 - You have compiled the netCDF library to specify use of LFS, for
   example with CFLAGS='-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE'
 - The file is structured so as not to require 64-bit offsets to
   netCDF variables, see:

     
http://www.unidata.ucar.edu/packages/netcdf/f90/Documentation/f90-html-docs/guide9.html#2236524

   for example.

Also note that 2GB netCDF files are not portable to platforms without
LFS, so you lose one of the advantages of netCDF by deciding to use
large files.

>                                                              ...  I have 
> Portland 
> Group Fortran 77 and 90 compilers on my machine which can read/write files > 
> 2GB, but when I compile my program using them I get a series of undefined 
> references to all the netCDF functions.  Does anyone have any insight to my 
> problem?

In general, you must build the netCDF Fortran interfaces using the same
compilers you will use to build and link Fortran programs later.  In
particular, it doesn't work to build the netCDF library using g77 as
the Fortran compiler and later try to link with programs compiled with
a Portland Group compiler.  If you will need to link with code
compiled with several different Fortran compilers, you will need to
build several versions of the Fortran interfaces.

To build netCDF with Portland Group compilers, you might try one of
the settings suggested in the installation instructions at:

  http://www.unidata.ucar.edu/packages/netcdf/INSTALL.html

for example:


    CC=/usr/bin/gcc
    CFLAGS='-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE'
    CPPFLAGS='-DNDEBUG -DpgiFortran'
    FC=/opt/pgi/linux86/bin/pgf90
    FFLAGS='-O -w'
    CXX=/usr/bin/g++

--Russ

_____________________________________________________________________

Russ Rew                                         UCAR Unidata Program
address@hidden                     http://www.unidata.ucar.edu