Added functionality for MacOS X

env/build_macos_gnu.env

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+# Setup instructions for macOS Big Sur (Darwin20) 
+# Compilers: gcc-11.2.0 including gfortran-11.2.0
+# MPI: openmpi/4.2.1
+# Option 1 (default) : M1 chip, arm64, running natively (not using Rosetta)  
+# Option 2 (uncomment if needed) Intel chip, x86_64
+# 
+# Option 1 (default):
+export BASH_ENV=/opt/homebrew/opt/lmod/init/bash
+# Option 2 (uncomment if needed):
+#export BASH_ENV=/usr/local/opt/lmod/init/bash  
+source $BASH_ENV
+
+# This path should point to your HPCstack installation directory
+export HPCstack=/Users/username/hpc-stack/install
+
+# This path should point to your SRW Application directory
+export SRW=/Users/username/ufs-srweather-app
+
+module purge
+# Load HPC stack 
+module use ${HPCstack}/modulefiles/stack
+module load hpc
+module load hpc-python
+#
+module load hpc-gnu
+module load openmpi
+module load hpc-openmpi
+
+module use ${SRW}/env
+#module load srw_common
+module load jasper/2.0.25
+module load zlib/1.2.11
+
+module load hdf5/1.10.6
+module load netcdf/4.7.4
+module load pio/2.5.3
+module load esmf/8_2_0
+module load fms/2021.04
+
+module load bacio/2.4.1
+module load crtm/2.3.0
+module load g2/3.4.5
+module load g2tmpl/1.10.0
+module load ip/3.3.3
+module load sp/2.3.3
+module load w3nco/2.4.1
+module load upp/10.0.10
+
+module load gftl-shared/v1.3.6
+module load yafyaml/v0.5.1
+module load mapl/2.12.2-esmf-8_2_0
+module load gfsio/1.4.1
+module load landsfcutil/2.4.1
+module load nemsio/2.5.4
+module load nemsiogfs/2.5.3
+module load sfcio/1.4.1
+module load sigio/2.3.2
+module load w3emc/2.9.2
+module load wgrib2/2.0.8
+module list
+
+# Option 1 compiler paths: 
+export CC=/opt/homebrew/bin/gcc
+export FC=/opt/homebrew/bin/gfortran
+export CXX=/opt/homebrew/bin/g++
+
+# Option 2 compiler paths:
+#export CC=/usr/local/bin/gcc
+#export FC=/usr/local/bin/gfortran
+#export CXX=/usr/local/bin/g++
+
+ulimit -S -s unlimited
+
+export MPI_CC=mpicc
+export MPI_CXX=mpicxx
+export MPI_FC=mpif90
+
+export CMAKE_C_COMPILER=${MPI_CC}
+export CMAKE_CXX_COMPILER=${MPI_CXX}
+export CMAKE_Fortran_COMPILER=${MPI_FC}
+export CMAKE_Platform=macos.gnu
+
+export CMAKE_Fortran_COMPILER_ID="GNU"
+export LDFLAGS="-L${MPI_ROOT}/lib"
+export FFLAGS="-DNO_QUAD_PRECISION -fallow-argument-mismatch "

env/wflow_macos.env

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+# Prepare environment for generating and running SRW workflow
+# (wflow_macos.env)
+
+export CMAKE_Platform=macos
+
+# This path should point to your python virtual environment directory,
+# `regional_workflow`, created earlier for 
+# 
+export VENV=/Users/username/venv/regional_workflow
+source $VENV/bin/activate
+
+# Uncomment if Rocoto workflow manager is used
+# This path should point to your Rocoto module location
+# ROCOTOmod=/Users/username/modules
+# module use ${ROCOTOmod}
+# module load rocoto
+# module list
+