WRF | unrecognized command line option ‘-f90=gfortran’ & ungrib.exe compile error

Issue

When compiling WPSv4.0/v4.2/v3.8.1

gfortran: error: unrecognized command line option ‘-f90=gfortran’

Solution

# Settings for    Linux x86_64 ppc64le, gfortran compiler with gcc   (dmpar)
#
DESCRIPTION     =       GNU ($SFC/$SCC)
DMPARALLEL      =        1
OMPCPP          =       # -D_OPENMP
OMP             =       # -fopenmp
OMPCC           =       # -fopenmp
SFC             =       gfortran
SCC             =       gcc
CCOMP           =       gcc
DM_FC           =       mpif90 -f90=gfortran
DM_CC           =       mpicc -cc=$(SCC)
FC              =       $(DM_FC)
CC              =       $(DM_CC) -DFSEEKO64_OK 
LD              =       $(FC)

modify DM_FC to

DM_FC = mpif90

without -f90-gfortran

Finally,

1. geogrid.exe and metgrid.exe
2. link_grib.csh

are generated.

But, no ungrib.exe !!!

Error

Error: Arguments of ‘iand’ have different kind type parameters at (1)

References

1. (RESOLVED) ungrib.exe compile error: Arguments of ‘iand’ have different kind type parameters at (1)ted
   • To dd those two extra lines to ungrib/src/ngl/g2/intmath.f (based on https://github.com/wrf-model/WPS/pull/119)
2. (RESOLVED) Not generating ungrib.exe

Solution

Fix mismatch integer kind in IAND intrinsic calls in g2 librar

ungrib/src/ngl/g2/intmath.f

ilog2_2=0
i=i_in
if(i<=0) return
if(iand(i,i-1)/=0) then
   !write(0,*) 'iand i-1'
   ilog2_2=1

to

      ilog2_2=0
      i=i_in
      if(i<=0) return
! WPS modification for the XL compiler
!      if(iand(i,i-1)/=0) then
      if(iand(i,i-1_2)/=0) then
         !write(0,*) 'iand i-1'
         ilog2_2=1

And,

ilog2_1=0
i=i_in
if(i<=0) return
if(iand(i,i-1)/=0) then
   !write(0,*) 'iand i-1'
   ilog2_1=1

to

      ilog2_1=0
      i=i_in
      if(i<=0) return
! WPS modification for the XL compiler
!      if(iand(i,i-1)/=0) then
      if(iand(i,i-1_1)/=0) then
         !write(0,*) 'iand i-1'
         ilog2_1=1

Works!!!