netcdf 4.0 lib not linking

[Ryan Schmidt]

On Mar 16, 2009, at 14:15, Yolande Serra wrote:

> I've written previously about this issue and got no reply.  I'm  
> trying again after trying everything I could think of to get my  
> netcdf 4.0 library installed with macport to work with the gcc43  
> also installed with macport.  I made a local port for netcdf in  
> which I compiled it with gcc43 after having installed gcc43 from  
> macport.  The build worked and I configured it with gfortran so  
> that the fortran libs were also installed with my netcdf libs.  I  
> selected to not have separate fortran libraries and did not  
> configure with shared libraries so everything is in libnetcdf.a.  I  
> checked using otool and all the right references are in  
> libnetcdf.a, at least if I compare it to a working version of  
> netcdf 4.0 on my old powerpc mac.  No netcdf 4.0 options were  
> turned on so I did not have to install netcdf with hdf5, zlib or  
> szlib (as this is what I tried at first and did not get it to work).
>
> So, the question is why do I get linking errors when I try to  
> compile fortran code that calls the netcdf libs?  I compile the  
> code with gfortran-mp-4.3 and use the same options as when I built  
> netcdf 4.0 (-fno-second-underscore -O2 -g).  I also have provided  
> the location of the include file and library explicitly in the  
> compile command line (-I/opt/local/include and -L/opt/local/lib - 
> lnetcdf).  I also call some udunits functions which do not give any  
> errors and udunits was also installed using macports and is in /opt/ 
> local.
>
> Do I need to recompile the gcc43 using the same options (-fno- 
> second-underscore)??  I tried compiling netcdf libs without this  
> option, but this also did not work.  I tried compiling my code  
> without that option as well and it did not work.  I also tried -fno- 
> underscoring - no luck. I have a netcdf 4.0 library installed on my  
> powerpc mac and can use gcc4.3 with that library with no problem  
> but neither of these packages were installed with macports.  I'd  
> like to use macports for the new mac (intel), as it seems more  
> convenient than building source code myself all the time.  However,  
> I desperately need a working netcdf library as all my data is  
> stored this way.

I'm afraid your specific questions are beyond my expertise.

I'm curious why you cannot use the netcdf port unmodified as it  
exists in MacPorts today. If it does not meet your needs, have you  
discussed your needs with the maintainer of the netcdf port to see if  
the port can be enhanced to meet your needs?