Re: [netcdfgroup] Unable to compile netCDF4-C++

• To: netcdfgroup@xxxxxxxxxxxxxxxx
• Subject: Re: [netcdfgroup] Unable to compile netCDF4-C++
• From: Gus Correa <gus@xxxxxxxxxxxxxxxxx>
• Date: Wed, 18 Jul 2018 18:27:12 -0400

Hi Namu

For the record, I am not a C++ programmer.
This is all I can do to help.

On CentOS 7.5, with the same libraries as you,
I get the same errors.
It looks like libnetcdf_c++ is the legacy/obsolete version.
'yum info' shows this:

Description : Legacy netCDF C++ library.  This library is provided
              for backward
            : compatibility only. New C++ development should
              be done with the netCDF
            : CXX4 C++ library.

See also this:

https://www.unidata.ucar.edu/support/help/MailArchives/netcdf/msg12530.html

But unfortunately that is the one available in Red Hat/CentOS 7.

The new interface is libnetcdf_c++4.

Unfortunately I couldn't find the libnetcdf_c++4 for RedHat/CentOS 7
on epel, which is too bad.

So, I guess this problem is really a matter of having only
the obsolete libnetcdf_c++ library.

I hope this helps,
Gus Correa

On 07/18/2018 04:34 PM, namu patel wrote:

On RedHat 7, using yum, I installed netCDF4 C and C++ libraries:

    $ ls /usr/lib64/*netcdf*
    /usr/lib64/libnetcdf_c++.so        /usr/lib64/libnetcdf.so
    /usr/lib64/libnetcdf_c++.so.4      /usr/lib64/libnetcdf.so.7
    /usr/lib64/libnetcdf_c++.so.4.2.0  /usr/lib64/libnetcdf.so.7.2.0

    $ ls /usr/include/*netcdf*
    /usr/include/netcdfcpp.h  /usr/include/netcdf.hh
    /usr/include/netcdf.h     /usr/include/netcdf_meta.h


I am trying to compile the code:

    #include <iostream>
    #include <netcdf>

    using namespace std;
    using namespace netCDF;

    int main()
    {
        return 0;
    }


using:

    g++ -o test test.cpp -I/usr/include -L/usr/lib64 -lnetcdf_c++4
    -lnetcdf -lm

​but get the error:

    ​
    fatal error: netcdf: No such file or directory
      #include <netcdf>
                       ^
    compilation terminated.

​I tried using netcdf.h and netcdfcpp.h. This gives me the error:

    ​
    error: ‘netCDF’ is not a namespace-name
      using namespace netCDF;
    error: expected namespace-name before ‘;’ token
      using namespace netCDF;

​I'll appreciate any help in trying to get this working.

Thanks,
Namu​



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