20030709: UDUNITS on UCAR's Blackforest IBM: underscore suffixes

Richard,

>Date: Wed, 09 Jul 2003 16:20:10 -500
>From: Richard Anyah <address@hidden>
>Organization: North Carolina State University
>To: Steve Emmerson <address@hidden>
>Subject: Re: 20030709: UDUNITS on UCAR's Blackforest IBM 

The above message contained the following:

    ...
    making `all' in directory /home/blackforest/anyah/udunits-1.11.7/src/lib

            ln -s ../port/misc/udalloc.c .
            ln -s ../port/misc/udalloc.h .
            c89 -c -O -I../port/misc -I../port/cfortran 
-DUT_DEFAULT_PATH='"/ptmp/anyah/UNIT/etc/udunits.dat"'  -D_ALL_SOURCE -Dextname 
utlib.c
    ...

I think I see the problem and the solution.  The UDUNITS package was 
built with the C compiler's "-Dextname" option (recommended practice)
but the netCDF package was not.  This means that the names of Fortran
routines in the UDUNITS package will end in underscores but the names of
Fortran routines in the netCDF package won't.  Your program is caught
between these different conventions: whichever convention it uses, it
won't be able to find the Fortran routines in the package that used the
opposite convention.

I suggest that you try rebuilding the UDUNITS package without the
"-Dextname" option:

    1.  Go to the top-level source directory of the UDUNITS package.

    2.  Perform steps 3 through 5 described near the end of the file
        INSTALL.

    3.  Edit the file "configure".  Find the following lines:

                # Ensure adherence to the trailing-underscore convention.
                  for arg in -Dextname; do
            case "$CPPFLAGS" in
              *$arg*)
                ;;
              *)
                CPPFLAGS="${CPPFLAGS-} $arg"
                ;;
            esac
          done
                  for arg in -qextname; do
            case "$FFLAGS" in
              *$arg*)
                ;;
              *)
                FFLAGS="${FFLAGS-} $arg"
                ;;
            esac
          done

        and either remove them or comment them out.

    4.  Perform steps 6 through 9 described near the end of the file
        INSTALL.

Then, recompile your program without the "-qextname" option and retry
the link step.

Please let me know if this helps.

Regards,
Steve Emmerson