Re: 980121: NetCDF-3.3.1 and fortran compiler option -U

Randy,

> To: address@hidden
> From: address@hidden (Randy Zagar)
> Subject: NetCDF-3.3.1 and fortran compiler option -U
> Organization: University of Delaware/College of Marine Studies
> Keywords: 199801211830.LAA15243

In the above message, you wrote:

> #1    `uname -a` = SunOS frodo 5.4 Generic_101945-49 sun4m sparc
> #2    VERSION=3.3.1
> #4    CC  = /opt/SUNWspro/bin/cc
>       F77 = /opt/SUNWspro/bin/f77
> 
> 
> First and most importantly, let me state that I am running NetCDF v3.3.1
> and it passes all test-suites and (nearly) all of oury codes work properly.
> 
> Here's my situation:
> 
> One of our graduate students here is running a fluid-dynamics code
> called SPEM (spectral primitive equation model), and because of the
> number of variables in the code the default Makefile uses the following
> options
> 
>       f77 ... -u -U ...
> 
> The -u option forces the compiler to abort on any undeclared variables,
> and the -U option preserves the case of symbol names used in the code.
> For example, if you were using the -U option then this code fragment would
> work properly
> 
>       X = 1
>       x = 2
> 
>       IF  (X.EQ.x) THEN
>             PRINT *, 'warning: symbol names reduced to lower-case.'
>       ENDIF
> 
> The conflict I am experiencing occurs because there are only lower-case
> symbol names in libnetcdf.a (and in the spem code), and the function
> declarations in netcdf.inc are in upper-case.
> 
> If I convert all the nc*() function calls to upper-case in the SPEM code,
> then I get unresolved symbols in the linking phase because the case of
> the symbols is preserved (e.g. looking for _NCOPN_ not _ncopn_ ).
> 
> I worked around this problem by dumping the -u option (allowing untyped
> variables), and making sure that all of his netCDF function calls were
> in lower-case.  I just wanted you to know that I/we aren't stuck, or
> anything like that, but that I wanted to offer a suggestion:
> 
> Would it be possible, in the next minor release, to have additional
> ENTRY statements in the fortran code (and a -U in the makefile) so
> that we can have symbol names in both cases (upper & lower) ?
> 
> An alternative to that would be to convert all the function declarations
> in netcdf.inc to use lower-case letters...

I think this is a better solution if it works.  Would you please verify
that it does and let me know?

> 
> I realize this probably isn't high on your list of priorities, but it's
> just a suggestion.
> 
> - -Randy
> 
> 
> ===
> 
> Randy Zagar                          E-Mail: address@hidden
> Sr. Scientific Programmer            E-Mail: address@hidden
> College of Marine Studies             Voice: (302) 831-1139
> University of Delaware                  FAX: (302) 831-6838
> Newark, DE 19716

It's a good suggestion.  Thanks.

Please let me know what you discover.

--------
Steve Emmerson   <http://www.unidata.ucar.edu>