[MITgcm-support] netcdf, genmake2 and pgi-compiler

[Martin Losch]

Ed,

thanks for the fixes. I'll try these things and send further detailed 
bug reports (o:

Martin

On Dec 26, 2004, at 5:38 PM, Ed Hill wrote:

> On Wed, 2004-12-22 at 09:42 +0100, Martin Losch wrote:
>> Hi Ed,
>>
>> After compiling netcdf libraries on a  64bit system with the pgi
>> compiler I made the following observation:
>> For 1 CPU (without MPI) everything is fine and I can link the 
>> libraries.
>> For more than 1 CPU (with MPI) genmake2 cannot link the netcdf
>> libraries and turns off mnc (as it should in this case).  The
>> mpif-library is the problem: genmake_warnings says something like
>>>   pgf77 -o genmake_tnc.o -L/opt/scali/lib64
>>> -L/tphs1/user2/mlosch/netcdf_amd64_p
>>> gi/lib  -lfmpi -lmpi -lnetcdf
>>> /opt/scali/lib64/libfmpi.so: undefined reference to `mpipriv_'
>> Now this is stupid of libfmpi.so, because mpipriv is a common block
>> defined in mpif.h, so linking fmpi requires include mpif.h, and mpif.h
>> is not included in this little genmake_tnc.for that genmake2 
>> generates.
>> If I change genmake2 to include mpif.h in genmake_tnc.for, I can link
>> the netcdf-libraries and run the mitgcm in parallel with MPI. But of
>> course this is only a hack for this particular situation. Can you 
>> think
>> of a clever way to take this situation into account in genmake2?
>
> Hi Martin,
>
> Once again, thanks for the detailed bug reports!
>
> I'm about to check in two small features to genmake2 that allow for:
>
>   1) setting SKIP_NETCDF_CHECK=t in your optfile will
>      skip the NetCDF test-compile
>
>   2) setting SKIP_NETCDF_CHECK=t and HAVE_NETCDF=t will
>      turn on NetCDF without the test-compile
>
>   3) if you use the genmake2 -mpi option or if you define
>      MPI=true in your optfile, then the NetCDF test compile
>      will include the "mpif.h" header
>
> One or more of the above combinations should allow you to either get 
> the
> test compile to work or to turn off the test completely (since it is
> *just* a convenience!).
>
> Ed
>
> -- 
> Edward H. Hill III, PhD
> office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
>              Cambridge, MA 02139-4307
> emails:  eh3 at mit.edu                ed at eh3.com
> URLs:    http://web.mit.edu/eh3/    http://eh3.com/
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> fax:     617-253-4464
>
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