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2003-01-10: make test error on NEC SX6: roundoff errors

Jingjia Luo,

>Date: Fri, 10 Jan 2003 10:52:52 +0900
>From: address@hidden
>Organization: ?
>To: address@hidden
>Subject: make test error

The above message contained the following:

> I am trying to install the netcdf library in
> NECSX6 with "-ew" option.  The error messgae appears during "make test"
> as below.
>  
> Making `test' in directory netcdf-3.5.0/src/ncgen
>         cc -o ncgen -O  main.o load.o ncgentab.o escapes.o  getfill.o init.o 
> genlib.o ../libsrc/libnetcdf.a 
>         ./ncgen -b -o c0.nc c0.cdl
>         ../ncdump/ncdump -n c1 c0.nc > c1.cdl
> *** ncgen -b test successful ***
>         ./ncgen -c -o ctest0.nc c0.cdl > ctest.c && \
>         cc -o ctest -O  -I../libsrc -I.  -DNDEBUG ctest.c 
> ../libsrc/libnetcdf.a  && \
>         ./ctest && \
>         ../ncdump/ncdump -n c1 ctest0.nc > ctest1.cdl
> "ctest.c", line 27: warning: improper integer precision : op "="
> 21c21
> <               i:d = -1.e+308, 0., 1.e+308 ;
> ---
> >&nb! sp;              i:d = -9.99999999999999e+307, 0., 
> >9.99999999999999e+307 ;
> 101c101
> <               :Gd = -1.e+308, 0., 1.e+308 ;
> ---
> >               :Gd = -9.99999999999999e+307, 0., 9.99999999999999e+307 ;
> 128c128
> <  dr = -1e+308, 1e+308 ;
> ---
> >  dr = -9.99999999999999e+307, 9.99999999999999e+307 ;
> 140c140
> <  d1 = -1e+308 ;
> ---
> >  d1 = -9.99999999999999e+307 ;
> 152c152
> <  d2 = -1e+308, 1e+308 ;
> ---
> >  d2 = -9.99999999999999e+307, 9.99999999999999e+307 ;
> 164c164
> <  d3 = -1e+308, 0, 1e+308 ;
> ---
> >  d3 = -9.99999999999999e+307, 0, 9.99999999999999e+307 ;
> *** ncgen -c test failed ***
> *** Error code 1 (bu21)
> make: fatal error.
> *** Error co! de 1 (bu21)
> make: fatal error.
> *** Error code 1 (bu21)
> make: fatal error.
>  
> Your helps are grateful.

The above "errors" are due to roundoff errors caused by the hardware of
the NEX SX6 (some supercomputers exhibit this behavior). You should be
able to safely ignore them.

I suggest that you install the netCDF package.  Test it with some
of your own programs.  I expect that it will work correctly.

> Best regards,
> Jingjia Luo

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