bug: advance_cymdh does not compile with nvhpc or cce

[hkershaw-brown]

:bug: :snail: Your bug may already be reported!

Describe the bug

1. on Derecho:

   module load nvhpc
   cd /DART/models/wrf/work/ 
   ./quickbuild.sh WRF_DART_utilities/advance_cymdh

2. success
3. failure:

   NVFORTRAN-S-0038-Symbol, iargc, has not been explicitly declared (/glade/derecho/scratch/hkershaw/build_everything/nvhpc.2023-12-11T0702/DART/models/wrf/WRF_DART_utilities/advance_cymdh.f90: 7)
   0 inform,   0 warnings,   1 severes, 0 fatal for advance_cymdh
   make: *** [Makefile:72: advance_cymdh.o] Error 2

Which model(s) are you working with?

wrf

Version of DART

v10.9.2

Have you modified the DART code?

No

Build information

Please describe:

1. Derecho
2. nvhpc nvfortran 23.1-0

[mjs2369]

Solution options:

1) Simply add integer, external :: iargc to WRF_DART_utilities/advance_cymdh.f90

2) Replace iargc() with the F2003 “COMMAND_ARGUMENT_COUNT” intrinsic function instead for better portability https://gcc.gnu.org/onlinedocs/gcc-4.2.4/gfortran/ https://gcc.gnu.org/onlinedocs/gfortran/COMMAND_005fARGUMENT_005fCOUNT.html

Here are some comments in the code for the NCEP obs_converter about machines not supporting iargc()

• https://github.com/NCAR/DART/blob/74b4221e5f4e41e4de2980fc9ff8697ba4540a8b/observations/obs_converters/NCEP/prep_bufr/convert_bufr/arg_test.f#L49
• https://github.com/NCAR/DART/blob/74b4221e5f4e41e4de2980fc9ff8697ba4540a8b/observations/obs_converters/NCEP/prep_bufr/convert_bufr/grabbufr.f#L66
• https://github.com/NCAR/DART/blob/74b4221e5f4e41e4de2980fc9ff8697ba4540a8b/observations/obs_converters/NCEP/prep_bufr/convert_bufr/stat_test.f#L75

Here we write our own function for COMMAND_ARGUMENT_COUNT() that calls iargc() instead of using the intrinsic? https://github.com/NCAR/DART/blob/74b4221e5f4e41e4de2980fc9ff8697ba4540a8b/models/wrf/WRF_DART_utilities/f2kcli.f90#L78C1-L97C42

[mjs2369]

Closed as completed via #619