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[netCDF #QVV-651237]: NetCDF 3.6.3: build warning for f90 library

Hi Reto,

> I've now built and tested both the 3.6.3 and 4.1.3 on OSX with gcc/gfortran 
> 4.5.3. It is correctly noted in the installation instruction that the 
> -DgFortran (or -DpgiFortran) cpp flag is automatically detected and set 
> during the configuration. This works only if the respective fortran compiler 
> is gfortran (pgf90/95). For NetCDF-4 compilation using MPI the fortran 
> compiler is a wrapper like mpif90 and thus -DgFortran (-DpgiFortran) have to 
> be manually set by the user.
> 
> Would it be possible to either add this to the Installation instructions or 
> alternatively find a way to auto-detect the compiler type even though the 
> compiler is embedded in a MPI wrapper?

Thanks for the suggestion, I've added it to our list of tasks.  If you want to 
follow its progress, you can see the Jira entry here:

  https://www.unidata.ucar.edu/jira/browse/NCF-84

--Russ

> On Jun 20, 2011, at 6:34 PM, Unidata netCDF Support wrote:
> 
> > Hi Reto
> >
> >> I've upgraded to both NetCDF 3.6.3 and the fink install of gcc/gfortran
> >> 4.5.2 on OSX 10.6 x86_64. NetCDF 3.6.3 builds fine and runs with both
> >> the C and F90 interfaces. So far so good.
> >>
> >> What worries me is the following warning during build-time, that was
> >> never there before in earlier NetCDF or gcc/gfortran versions. This may
> >> be a hint that the array is initialized with 0 dimension size and may
> >> cause problem under certain circumstances?
> >>
> >> libtool: compile:  gfortran -I../libsrc -I. -g -O2 -c netcdf.f90 -o 
> >> netcdf.o
> >> netcdf_text_variables.f90:284.93:
> >> Included at netcdf.f90:51:
> >>
> >> localMap(:numDims  ) = (/ 1, (product(localCount(:counter)), counter = 1, 
> >> numDims - 1) /)
> >> 1
> >> Warning: DO loop at (1) will be executed zero times
> >> netcdf_text_variables.f90:60.93:
> >> Included at netcdf.f90:51:
> >>
> >> localMap(:numDims  ) = (/ 1, (product(localCount(:counter)), counter = 1, 
> >> numDims - 1) /)
> >> 1
> >> Warning: DO loop at (1) will be executed zero times
> >>
> >>
> >> Please let me know what you think. numDims is initialized earlier on in
> >> netcdf_text_variables.f90 with the value of 1, so numDims - 1 is 0,
> >> which means that the localMap(:numDims) will be of size 0. Is that ok or
> >> not?
> >
> > It's OK, and has never caused any reported problems other than this
> > harmless warning that gfortran added in an upgrade.  Getting rid of
> > the warning actually makes the code less maintainable, but it's
> > probably worth it for reassuring users who look at the compiler
> > warnings that it's not a symptom of a bug.
> >
> > By the way, we just released netCDF-4.1.3 and it can be built with the
> > --disable-netcdf-4 configure option that results in a netCDF-3 library
> > completely compatible with the old netCDF-3.6.3 library, but with some
> > bug fixes and enhancements that haven't been incorporated in the 3.6.3
> > release.
> >
> > --Russ
> >
> > Russ Rew                                         UCAR Unidata Program
> > address@hidden                      http://www.unidata.ucar.edu
> >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: QVV-651237
> > Department: Support netCDF
> > Priority: Normal
> > Status: Closed
> >
> 
> 

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



Ticket Details
===================
Ticket ID: QVV-651237
Department: Support netCDF
Priority: High
Status: Closed