Hello,
When you run g++, you need to link against the netCDF C++ library, otherwise
the resultant executable does not know where to find the 'NcVar::' functions,
as listed below. Try the following:
$ g++ -o readNet readNet.cpp -l netcdf-cxx4 -l netcdf
You may need to specify the location of your C++ and C libraries, if they are
not in the standard locations on your system.
I hope this helps!
-Ward
> Hello,
>
> Im sorry this is a simple error but I canât seem to fix it. I am having
> trouble compiling and running the C++ example file found here.
>
> https://www.unidata.ucar.edu/software/netcdf/examples/programs/SimpleXyWr.cpp
>
>
>
> I have installed netcdf4 by using brew command âbrew install netcdfâ. I
> can see it there under Celler along with the other dependancies I installed
> (ncview etc..)
>
>
>
> I have the c++ file inside of atom and named it âreadNet.cppâ. When I run
> this command from the terminal I get the following errors (sudo g++ -o
> readNet readNet.cpp)
>
>
> Undefined symbols for architecture x86_64:
> "netCDF::NcVar::NcVar()", referenced from:
> _main in readNet-feb390.o
> "netCDF::NcVar::operator=(netCDF::NcVar const&)", referenced from:
> _main in readNet-feb390.o
> "netCDF::NcFile::NcFile(std::__1::basic_string<char,
> std::__1::char_traits<char>, std::__1::allocator<char> > const&,
> netCDF::NcFile::FileMode)", referenced from:
> _main in readNet-feb390.o
> "netCDF::NcFile::~NcFile()", referenced from:
> _main in readNet-feb390.o
> "netCDF::NcVar::getVar(float*) const", referenced from:
> _main in readNet-feb390.o
> "netCDF::NcVar::getVar(std::__1::vector<unsigned long,
> std::__1::allocator<unsigned long> > const&, std::__1::vector<unsigned long,
> std::__1::allocator<unsigned long> > const&, void*) const", referenced from:
> _main in readNet-feb390.o
> "netCDF::NcGroup::getVar(std::__1::basic_string<char,
> std::__1::char_traits<char>, std::__1::allocator<char> > const&,
> netCDF::NcGroup::Location) const", referenced from:
> _main in readNet-feb390.o
> "typeinfo for netCDF::exceptions::NcException", referenced from:
> GCC_except_table0 in readNet-feb390.o
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
>
>
> I have tried many things but I just cant seem to get it to compile. When I
> remove the stuff inside the try and catch it runs (the blank program). Ive
> also tried to get it running in xCode but when I link the dependancies it
> comes up with cannot find netcdf. (#include <netcdf>).
>
> Any help would be greatly appreciated
>
> Thank you
> Sam
>
Ticket Details
===================
Ticket ID: YBS-587954
Department: Support netCDF
Priority: Normal
Status: Closed
===================
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