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[netCDF #QYJ-726116]: undefined reference for test_prog.f90

Hi Lou,

> Package Version: 4.1.3
> Operating System: Cygwin/W7 pro-64 bit
> Hardware: Xeon
> Description of problem:
> 
> Downloaded netcdf-4.1.3.tar.gz; ran
> ./configure --prefix=/usr/local --disable-netcdf-4
> make check
> make install
> 
> Got successfully installed message. Then ran
> 
> gfortran test_prog.f90 -I/usr/local/include /usr/local/lib/libnetdf.a

One problem might just be the typo of specifying "libnetdf.a" instead of 
"libnetcdf.a", but assuming you actually got that right when you tried it,
maybe you should be linking to the shared libraries rather than the static 
libraries.

> Got message:
> /tmp/ccmrh3C6.o:test_prog.f90:(text+0x6f): undefined reference to 
> '___netcdf_MOD_nf90_inq_libvers'
> collect2: ld returned 1 exit status
> 
> /usr/local/include does contain NETCDF.mod
> Any help would be appreciated.

By default, versions 4.1.3 and later install shared libraries.  When shared
libraries are used, netCDF needs to create a separate library for Fortran
instead of combining the C and Fortran libraries together into one static
library.  Therefor, you need to tell gfortran where to look for the Fortran
functions, which will be in a library with the name "libnetcdff".

So first try linking with the shared libraries, using

 gfortran test_prog.f90 -I/usr/local/include -L/usr/local/lib -lnetcdff -lnetcdf

You can also link with the static libraries by instead using

 gfortran test_prog.f90 -I/usr/local/include /usr/local/lib/libnetcdff.a 
/usr/local/lib/libnetcdf.a

Finally, if you don't want the shared libraries built but want to always use
static libraries, you can rebuild with the configure option --disable-shared
and then reinstall, but you might have to uninstall the shared libraries from
the previous build to make sure they aren't used.  But shared libraries have
some advantages over static libraries, see:

  http://www.unidata.ucar.edu/netcdf/docs/faq.html#Shared%20Libraries

--Russ





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



Ticket Details
===================
Ticket ID: QYJ-726116
Department: Support netCDF
Priority: Normal
Status: Closed