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

Lou,

> > 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
> 
> In both cases, I got many messages (identical I believe) of the sort:
> 
> /usr/local/lib/libnetcdf.a(liboc_la-ocinternal.o): In function
> `ocinternalinitialize':
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/ocinternal.c:142:
> undefined reference to `_curl_version_info'
> /usr/local/lib/libnetcdf.a(liboc_la-http.o): In function `ocfetchhttpcode':
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:27: undefined
> reference to `_curl_easy_getinfo'
> /usr/local/lib/libnetcdf.a(liboc_la-http.o): In function `ocfetchurl_file':
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:41: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:46: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:79: undefined
> reference to `_curl_easy_strerror'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:51: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:56: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:60: undefined
> reference to `_curl_easy_perform'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:74: undefined
> reference to `_curl_easy_getinfo'
> /usr/local/lib/libnetcdf.a(liboc_la-http.o): In function `ocfetchurl':
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:91: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:96: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:133: undefined
> reference to `_curl_easy_strerror'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:101: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:106: undefined
> reference to `_curl_easy_setopt'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:108: undefined
> reference to `_curl_easy_perform'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:119: undefined
> reference to `_curl_easy_getinfo'
> /home/goodlou/Netcdf-download/netcdf-4.1.3/oc/http.c:111: undefined
> reference to `_curl_easy_strerror'

All these are from the "curl" library, that's required for OPeNDAP support, 
which is included
by default if you don't specify the --disable-dap option to configure when you 
build netCDF,
and if the configure script locates a working libcurl.  For shared libraries, 
the location of
libcurl should have been built in to the library, but for static libraries it 
would need to be
specified, as in

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

if it was in /usr/local/lib, otherwise you'd need to say where it was with 
-L/where/libcurl/is.

Does the output of

  nc-config --all

include the line ?

  --has-dap   -> yes

If so, what are the outputs of

  nc-config --flibs

and 

  nc-config --libs

?

--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