From 122010e95cb74701fea676c35ab407c416237bb0 Mon Sep 17 00:00:00 2001
From: GeorgeGayno-NOAA <52789452+GeorgeGayno-NOAA@users.noreply.github.com>
Date: Mon, 18 Nov 2024 09:51:03 -0500
Subject: [PATCH] Port to Intel LLVM on Hera, Orion and Hercules (#996)

Also update the Github workflows to Intel LLVM.

Retain option to use Intel Classic on those machines.

Fixes #879.
---
 .github/workflows/macos_clang.yaml            |  2 +-
 .github/workflows/ubuntu_gcc.yaml             |  2 +-
 .github/workflows/ubuntu_intel.yaml           | 18 ++---
 CMakeLists.txt                                | 17 ++++-
 build_all.sh                                  |  9 ++-
 ci/spack.yaml                                 |  5 +-
 driver_scripts/driver_grid.hera.sh            |  2 +-
 driver_scripts/driver_grid.hercules.sh        |  2 +-
 driver_scripts/driver_grid.orion.sh           |  2 +-
 modulefiles/build.hera.intelllvm.lua          | 74 +++++++++++++++++++
 modulefiles/build.hercules.intel.lua          |  2 +-
 modulefiles/build.hercules.intelllvm.lua      | 68 +++++++++++++++++
 modulefiles/build.orion.intel.lua             |  2 +-
 modulefiles/build.orion.intelllvm.lua         | 68 +++++++++++++++++
 reg_tests/chgres_cube/driver.hera.sh          |  2 +-
 reg_tests/chgres_cube/driver.hercules.sh      |  2 +-
 reg_tests/chgres_cube/driver.orion.sh         |  2 +-
 reg_tests/cpld_gridgen/rt.sh                  | 10 ++-
 reg_tests/global_cycle/driver.hera.sh         |  2 +-
 reg_tests/global_cycle/driver.hercules.sh     |  2 +-
 reg_tests/global_cycle/driver.orion.sh        |  2 +-
 reg_tests/grid_gen/driver.hera.sh             |  2 +-
 reg_tests/grid_gen/driver.hercules.sh         |  2 +-
 reg_tests/grid_gen/driver.orion.sh            |  2 +-
 reg_tests/ice_blend/driver.hera.sh            |  2 +-
 reg_tests/ice_blend/driver.hercules.sh        |  2 +-
 reg_tests/ice_blend/driver.orion.sh           |  2 +-
 reg_tests/ocnice_prep/rt.sh                   | 15 +++-
 reg_tests/snow2mdl/driver.hera.sh             |  2 +-
 reg_tests/snow2mdl/driver.hercules.sh         |  2 +-
 reg_tests/snow2mdl/driver.orion.sh            |  2 +-
 reg_tests/weight_gen/driver.hera.sh           |  2 +-
 reg_tests/weight_gen/driver.hercules.sh       |  2 +-
 reg_tests/weight_gen/driver.orion.sh          |  2 +-
 sorc/chgres_cube.fd/CMakeLists.txt            |  2 +-
 sorc/cpld_gridgen.fd/CMakeLists.txt           |  2 +-
 sorc/emcsfc_snow2mdl.fd/CMakeLists.txt        |  2 +-
 sorc/fre-nctools.fd/shared_lib/create_xgrid.c |  8 +-
 sorc/fre-nctools.fd/shared_lib/interp.c       |  4 +-
 sorc/fre-nctools.fd/shared_lib/mosaic_util.c  |  6 +-
 .../tools/make_hgrid/make_hgrid.c             |  8 +-
 sorc/fvcom_tools.fd/CMakeLists.txt            |  2 +-
 sorc/gblevents.fd/CMakeLists.txt              |  2 +-
 sorc/global_cycle.fd/CMakeLists.txt           |  2 +-
 .../filter_topo.fd/CMakeLists.txt             |  2 +-
 sorc/lsm_routines.fd/noah.fd/CMakeLists.txt   |  2 +-
 sorc/ocean_merge.fd/CMakeLists.txt            |  2 +-
 sorc/ocnice_prep.fd/CMakeLists.txt            |  2 +-
 .../inland.fd/CMakeLists.txt                  |  2 +-
 .../orog_mask_tools.fd/lake.fd/CMakeLists.txt |  2 +-
 .../orog_mask_tools.fd/orog.fd/CMakeLists.txt |  2 +-
 .../orog_gsl.fd/CMakeLists.txt                |  2 +-
 .../mask.fd/CMakeLists.txt                    |  2 +-
 .../ramp.fd/CMakeLists.txt                    |  2 +-
 .../topo.fd/CMakeLists.txt                    |  2 +-
 sorc/sfc_climo_gen.fd/CMakeLists.txt          |  2 +-
 sorc/vcoord_gen.fd/CMakeLists.txt             |  2 +-
 sorc/weight_gen.fd/CMakeLists.txt             |  2 +-
 tests/chgres_cube/CMakeLists.txt              |  2 +-
 tests/chgres_cube/ftst_read_atm_grib2.F90     |  2 +-
 tests/cpld_gridgen/CMakeLists.txt             |  2 +-
 tests/emcsfc_snow2mdl/CMakeLists.txt          |  2 +-
 tests/filter_topo/CMakeLists.txt              |  4 +-
 tests/fre-nctools/shared_lib/CMakeLists.txt   |  6 --
 .../fre-nctools/shared_lib/tst_create_xgrid.c |  5 +-
 tests/fvcom_tools/CMakeLists.txt              |  2 +-
 tests/global_cycle/CMakeLists.txt             |  2 +-
 tests/ocnice_prep/CMakeLists.txt              |  2 +-
 tests/orog/CMakeLists.txt                     |  2 +-
 tests/sfc_climo_gen/CMakeLists.txt            |  2 +-
 util/gdas_init/driver.hera.sh                 |  2 +-
 util/sfc_climo_gen/sfc_gen.sh                 |  6 +-
 util/weight_gen/run.hera.sh                   |  2 +-
 util/weight_gen/run.hercules.sh               |  2 +-
 util/weight_gen/run.orion.sh                  |  2 +-
 75 files changed, 343 insertions(+), 104 deletions(-)
 create mode 100644 modulefiles/build.hera.intelllvm.lua
 create mode 100644 modulefiles/build.hercules.intelllvm.lua
 create mode 100644 modulefiles/build.orion.intelllvm.lua

diff --git a/.github/workflows/macos_clang.yaml b/.github/workflows/macos_clang.yaml
index 25f6bc693..817acd38f 100644
--- a/.github/workflows/macos_clang.yaml
+++ b/.github/workflows/macos_clang.yaml
@@ -47,7 +47,7 @@ jobs:
         run: |
           git clone -c feature.manyFiles=true https://github.com/JCSDA/spack.git
           source spack/share/spack/setup-env.sh
-          sed "s/\[intel, gcc@10:10, apple-clang@14\]/\[apple-clang@14\]/g" ufs_utils/ci/spack.yaml > spack_ci.yaml
+          sed "s/\[oneapi, gcc@10:10, apple-clang@14\]/\[apple-clang@14\]/g" ufs_utils/ci/spack.yaml > spack_ci.yaml
           spack env create ufs_utils-env spack_ci.yaml
           spack env activate ufs_utils-env
           spack external find
diff --git a/.github/workflows/ubuntu_gcc.yaml b/.github/workflows/ubuntu_gcc.yaml
index b501ef5ef..850434efe 100644
--- a/.github/workflows/ubuntu_gcc.yaml
+++ b/.github/workflows/ubuntu_gcc.yaml
@@ -47,7 +47,7 @@ jobs:
         run: |
           git clone -c feature.manyFiles=true https://github.com/JCSDA/spack.git
           source spack/share/spack/setup-env.sh
-          sed "s/\[intel, gcc@10:10, apple-clang@14\]/\[gcc@10:10\]/g" ufs_utils/ci/spack.yaml > spack_ci.yaml
+          sed "s/\[oneapi, gcc@10:10, apple-clang@14\]/\[gcc@10:10\]/g" ufs_utils/ci/spack.yaml > spack_ci.yaml
           spack env create ufs_utils-env spack_ci.yaml
           spack env activate ufs_utils-env
           sudo apt install cmake
diff --git a/.github/workflows/ubuntu_intel.yaml b/.github/workflows/ubuntu_intel.yaml
index 7c882c313..b90e31234 100644
--- a/.github/workflows/ubuntu_intel.yaml
+++ b/.github/workflows/ubuntu_intel.yaml
@@ -7,14 +7,14 @@ defaults:
   run:
     shell: bash -leo pipefail {0}
 
-# Set I_MPI_CC/F90 so Intel MPI wrapper uses icc/ifort instead of gcc/gfortran
+# Set I_MPI_CC/F90 so IntelLLVM is used.
 env:
   cache_key: intel
-  CC: icc
-  FC: ifort
-  CXX: icpc
-  I_MPI_CC: icc
-  I_MPI_F90: ifort
+  CC: mpiicc
+  FC: mpiifort
+  CXX: mpiicpc
+  I_MPI_CC: icx
+  I_MPI_F90: ifx
 
 # The jobs are split into:
 # 1. a dependency build step (setup), and
@@ -59,7 +59,7 @@ jobs:
         run: |
           git clone -c feature.manyFiles=true https://github.com/JCSDA/spack.git
           source spack/share/spack/setup-env.sh
-          sed "s/\[intel, gcc@10:10, apple-clang@14\]/\[intel\]/g" ufs_utils/ci/spack.yaml > spack_ci.yaml
+          sed "s/\[oneapi, gcc@10:10, apple-clang@14\]/\[oneapi\]/g" ufs_utils/ci/spack.yaml > spack_ci.yaml
           spack env create ufs_utils-env spack_ci.yaml
           spack env activate ufs_utils-env
           spack compiler find
@@ -99,8 +99,8 @@ jobs:
         run: |
           source spack/share/spack/setup-env.sh
           spack env activate ufs_utils-env
-          export CC=mpiicc
-          export FC=mpiifort
+          export CC=mpiicx
+          export FC=mpiifx
           cd ufs_utils
           mkdir -p build && cd build
           cmake -DCMAKE_INSTALL_PREFIX=../install ..
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5408e7c3b..503a5953f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@ option(CHGRES "Enable building chgres_cube.fd" ON)
 option(CHGRES_ALL "Build chgres with all input data options." OFF)
 option(OROG_MASK_TOOLS "Enable building orog_mask_tools.fd" ON)
 # OROG_MASK_TOOLS must be ON for OROG_NETCDF_TOOLS to build.
-option(OROG_NETCDF_TOOLS "Enable building orog_netcdf_tools.fd" OFF)
+option(OROG_NETCDF_TOOLS "Enable building orog_netcdf_tools.fd" ON)
 option(SFC_CLIMO_GEN "Enable building sfc_climo_gen.fd" ON)
 option(VCOORD_GEN "Enable building vcoord_gen.fd" ON)
 option(FVCOMTOOLS "Enable building fvcom_tools.fd" ON)
@@ -67,10 +67,15 @@ if(NOT CMAKE_BUILD_TYPE MATCHES "^(Debug|Release|RelWithDebInfo|MinSizeRel)$")
 endif()
 
 # Set compiler flags.
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -g -traceback")
   set(CMAKE_Fortran_FLAGS_RELEASE "-O3 -fp-model precise")
   set(CMAKE_Fortran_FLAGS_DEBUG "-O0 -check all -ftrapuv")
+# On some machines (Hera), using -check all results in an error
+# at the linking step. The uninit check is the culprit.
+  if(CMAKE_Fortran_COMPILER_ID MATCHES "^(IntelLLVM)$")
+    set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -check nouninit")
+  endif()
   if(APPLE)
     # The linker on macOS does not include `common symbols` by default.
     # Passing the -c flag includes them and fixes an error with undefined symbols.
@@ -86,10 +91,14 @@ elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS_DEBUG "-O0 -ggdb -Wall -fcheck=all")
 endif()
 
-if(CMAKE_C_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_C_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -traceback")
-  set(CMAKE_C_FLAGS_RELEASE "-O2")
   set(CMAKE_C_FLAGS_DEBUG "-O0")
+  if(CMAKE_C_COMPILER_ID MATCHES "^(Intel)$")
+    set(CMAKE_C_FLAGS_RELEASE "-O2")
+  else()
+    set(CMAKE_C_FLAGS_RELEASE "-O1")
+  endif()
 endif()
 
 # Find packages.
diff --git a/build_all.sh b/build_all.sh
index eb57c7b2d..7012cd152 100755
--- a/build_all.sh
+++ b/build_all.sh
@@ -19,7 +19,8 @@ source "${DIR_ROOT}/sorc/machine-setup.sh"
 
 # User Options
 target=${target:-"NULL"}
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"} # If IntelLLVM is not available on the machine, will
+                                  # default to Intel classic.
 
 if [[ "$target" == "linux.*" || "$target" == "macosx.*" ]]; then
   unset -f module
@@ -29,6 +30,12 @@ if [[ "$target" == "linux.*" || "$target" == "macosx.*" ]]; then
 else
   set +x
   module use "${DIR_ROOT}/modulefiles"
+  if [[ "$compiler" == "intelllvm" ]]; then
+    if [[ ! -f ${DIR_ROOT}/modulefiles/build.$target.$compiler.lua ]];then
+      echo "IntelLLVM not available. Will use Intel Classic."
+      compiler=intel
+    fi
+  fi
   module load "build.$target.$compiler" > /dev/null
   module list
   set -x
diff --git a/ci/spack.yaml b/ci/spack.yaml
index f0db7c2ac..ee8a4ee1b 100644
--- a/ci/spack.yaml
+++ b/ci/spack.yaml
@@ -2,7 +2,7 @@
 spack:
   packages:
     all:
-      compiler: [intel, gcc@10:10, apple-clang@14]
+      compiler: [oneapi, gcc@10:10, apple-clang@14]
   specs:
   - netcdf-c@4.9.2
   - netcdf-fortran@4.6.1
@@ -12,8 +12,7 @@ spack:
   - nemsio@2.5.4
   - sp@2.5.0
   - w3emc@2.10.0
-  - sfcio@1.4.1
-  - sigio@2.3.2
+  - sigio@2.3.3
   - nccmp@1.9.0.1
   - parallelio@2.5.10+fortran~pnetcdf
   - esmf@8.6.0
diff --git a/driver_scripts/driver_grid.hera.sh b/driver_scripts/driver_grid.hera.sh
index 8c46694f9..e990ac948 100755
--- a/driver_scripts/driver_grid.hera.sh
+++ b/driver_scripts/driver_grid.hera.sh
@@ -64,7 +64,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 source ../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../modulefiles
 module load build.$target.$compiler
diff --git a/driver_scripts/driver_grid.hercules.sh b/driver_scripts/driver_grid.hercules.sh
index c76366005..516bb50ea 100644
--- a/driver_scripts/driver_grid.hercules.sh
+++ b/driver_scripts/driver_grid.hercules.sh
@@ -64,7 +64,7 @@ set -x
 
 source ../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 #-----------------------------------------------------------------------
diff --git a/driver_scripts/driver_grid.orion.sh b/driver_scripts/driver_grid.orion.sh
index 656afcf33..36d07cc5f 100755
--- a/driver_scripts/driver_grid.orion.sh
+++ b/driver_scripts/driver_grid.orion.sh
@@ -64,7 +64,7 @@ set -x
 
 source ../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 #-----------------------------------------------------------------------
diff --git a/modulefiles/build.hera.intelllvm.lua b/modulefiles/build.hera.intelllvm.lua
new file mode 100644
index 000000000..64de60839
--- /dev/null
+++ b/modulefiles/build.hera.intelllvm.lua
@@ -0,0 +1,74 @@
+help([[
+Load environment to compile UFS_UTILS on Hera using Intel
+]])
+
+hpss_ver=os.getenv("hpss_ver") or ""
+load(pathJoin("hpss", hpss_ver))
+
+prepend_path("MODULEPATH", "/scratch1/NCEPDEV/nems/role.epic/spack-stack/spack-stack-1.6.0/envs/unified-env-rocky8/install/modulefiles/Core")
+
+stack_intel_ver=os.getenv("stack_intel_ver") or "2021.5.0"
+load(pathJoin("stack-intel", stack_intel_ver))
+
+stack_impi_ver=os.getenv("stack_impi_ver") or "2021.5.1"
+load(pathJoin("stack-intel-oneapi-mpi", stack_impi_ver))
+
+load("gnu")
+load("intel/2024.2.1")
+
+cmake_ver=os.getenv("cmake_ver") or "3.23.1"
+load(pathJoin("cmake", cmake_ver))
+
+bacio_ver=os.getenv("bacio_ver") or "2.4.1"
+load(pathJoin("bacio", bacio_ver))
+
+g2_ver=os.getenv("g2_ver") or "3.4.5"
+load(pathJoin("g2", g2_ver))
+
+ip_ver=os.getenv("ip_ver") or "4.3.0"
+load(pathJoin("ip", ip_ver))
+
+nemsio_ver=os.getenv("nemsio_ver") or "2.5.4"
+load(pathJoin("nemsio", nemsio_ver))
+
+sp_ver=os.getenv("sp_ver") or "2.5.0"
+load(pathJoin("sp", sp_ver))
+
+w3emc_ver=os.getenv("w3emc_ver") or "2.10.0"
+load(pathJoin("w3emc", w3emc_ver))
+
+-- Uncomment when CHGRES_ALL is ON
+--sfcio_ver=os.getenv("sfcio_ver") or "1.4.1"
+--load(pathJoin("sfcio", sfcio_ver))
+
+sigio_ver=os.getenv("sigio_ver") or "2.3.2"
+load(pathJoin("sigio", sigio_ver))
+
+zlib_ver=os.getenv("zlib_ver") or "1.2.13"
+load(pathJoin("zlib", zlib_ver))
+
+png_ver=os.getenv("png_ver") or "1.6.37"
+load(pathJoin("libpng", png_ver))
+
+netcdf_c_ver=os.getenv("netcdf_c_ver") or "4.9.2"
+load(pathJoin("netcdf-c", netcdf_c_ver))
+
+netcdf_fortran_ver=os.getenv("netcdf_fortran_ver") or "4.6.1"
+load(pathJoin("netcdf-fortran", netcdf_fortran_ver))
+
+nccmp_ver=os.getenv("nccmp_ver") or "1.9.0.1"
+load(pathJoin("nccmp", nccmp_ver))
+
+esmf_ver=os.getenv("esmf_ver") or "8.6.0"
+load(pathJoin("esmf", esmf_ver))
+
+nco_ver=os.getenv("nco_ver") or "5.0.6"
+load(pathJoin("nco", nco_ver))
+
+setenv("I_MPI_CC", "icx")
+setenv("I_MPI_FC", "ifx")
+
+setenv("CC", "mpicc")
+setenv("FC", "mpifc")
+
+whatis("Description: UFS_UTILS build environment")
diff --git a/modulefiles/build.hercules.intel.lua b/modulefiles/build.hercules.intel.lua
index 0cdb92e13..23314b7bd 100644
--- a/modulefiles/build.hercules.intel.lua
+++ b/modulefiles/build.hercules.intel.lua
@@ -1,5 +1,5 @@
 help([[
-Load environment to compile UFS_UTILS on Hercules using Intel
+Load environment to compile UFS_UTILS on Hercules using Intel Classic
 ]])
 
 prepend_path("MODULEPATH", "/work/noaa/epic/role-epic/spack-stack/hercules/spack-stack-1.6.0/envs/unified-env/install/modulefiles/Core")
diff --git a/modulefiles/build.hercules.intelllvm.lua b/modulefiles/build.hercules.intelllvm.lua
new file mode 100644
index 000000000..5253076b2
--- /dev/null
+++ b/modulefiles/build.hercules.intelllvm.lua
@@ -0,0 +1,68 @@
+help([[
+Load environment to compile UFS_UTILS on Hercules using IntelLLVM
+]])
+
+prepend_path("MODULEPATH", "/work/noaa/epic/role-epic/spack-stack/hercules/spack-stack-1.6.0/envs/unified-env/install/modulefiles/Core")
+
+stack_intel_ver=os.getenv("stack_intel_ver") or "2021.9.0"
+load(pathJoin("stack-intel", stack_intel_ver))
+
+stack_impi_ver=os.getenv("stack_impi_ver") or "2021.9.0"
+load(pathJoin("stack-intel-oneapi-mpi", stack_impi_ver))
+
+cmake_ver=os.getenv("cmake_ver") or "3.23.1"
+load(pathJoin("cmake", cmake_ver))
+
+bacio_ver=os.getenv("bacio_ver") or "2.4.1"
+load(pathJoin("bacio", bacio_ver))
+
+g2_ver=os.getenv("g2_ver") or "3.4.5"
+load(pathJoin("g2", g2_ver))
+
+ip_ver=os.getenv("ip_ver") or "4.3.0"
+load(pathJoin("ip", ip_ver))
+
+nemsio_ver=os.getenv("nemsio_ver") or "2.5.4"
+load(pathJoin("nemsio", nemsio_ver))
+
+sp_ver=os.getenv("sp_ver") or "2.5.0"
+load(pathJoin("sp", sp_ver))
+
+w3emc_ver=os.getenv("w3emc_ver") or "2.10.0"
+load(pathJoin("w3emc", w3emc_ver))
+
+-- Uncomment when CHGRES_ALL is ON
+--sfcio_ver=os.getenv("sfcio_ver") or "1.4.1"
+--load(pathJoin("sfcio", sfcio_ver))
+
+sigio_ver=os.getenv("sigio_ver") or "2.3.2"
+load(pathJoin("sigio", sigio_ver))
+
+zlib_ver=os.getenv("zlib_ver") or "1.2.13"
+load(pathJoin("zlib", zlib_ver))
+
+png_ver=os.getenv("png_ver") or "1.6.37"
+load(pathJoin("libpng", png_ver))
+
+netcdf_c_ver=os.getenv("netcdf_c_ver") or "4.9.2"
+load(pathJoin("netcdf-c", netcdf_c_ver))
+
+netcdf_fortran_ver=os.getenv("netcdf_fortran_ver") or "4.6.1"
+load(pathJoin("netcdf-fortran", netcdf_fortran_ver))
+
+nccmp_ver=os.getenv("nccmp_ver") or "1.9.0.1"
+load(pathJoin("nccmp", nccmp_ver))
+
+esmf_ver=os.getenv("esmf_ver") or "8.6.0"
+load(pathJoin("esmf", esmf_ver))
+
+nco_ver=os.getenv("nco_ver") or "5.0.6"
+load(pathJoin("nco", nco_ver))
+
+setenv("I_MPI_CC", "icx")
+setenv("I_MPI_F90", "ifx")
+
+setenv("CC", "mpiicc")
+setenv("FC", "mpiifort")
+
+whatis("Description: UFS_UTILS build environment")
diff --git a/modulefiles/build.orion.intel.lua b/modulefiles/build.orion.intel.lua
index d0f93d9a4..1d51da87a 100644
--- a/modulefiles/build.orion.intel.lua
+++ b/modulefiles/build.orion.intel.lua
@@ -1,5 +1,5 @@
 help([[
-Load environment to compile UFS_UTILS on Orion using Intel
+Load environment to compile UFS_UTILS on Orion using Intel classic
 ]])
 
 prepend_path("MODULEPATH", "/work/noaa/epic/role-epic/spack-stack/orion/spack-stack-1.6.0/envs/unified-env-rocky9/install/modulefiles/Core")
diff --git a/modulefiles/build.orion.intelllvm.lua b/modulefiles/build.orion.intelllvm.lua
new file mode 100644
index 000000000..9b2464b11
--- /dev/null
+++ b/modulefiles/build.orion.intelllvm.lua
@@ -0,0 +1,68 @@
+help([[
+Load environment to compile UFS_UTILS on Orion using IntelLLVM
+]])
+
+prepend_path("MODULEPATH", "/work/noaa/epic/role-epic/spack-stack/orion/spack-stack-1.6.0/envs/unified-env-rocky9/install/modulefiles/Core")
+
+stack_intel_ver=os.getenv("stack_intel_ver") or "2021.9.0"
+load(pathJoin("stack-intel", stack_intel_ver))
+
+stack_impi_ver=os.getenv("stack_impi_ver") or "2021.9.0"
+load(pathJoin("stack-intel-oneapi-mpi", stack_impi_ver))
+
+cmake_ver=os.getenv("cmake_ver") or "3.23.1"
+load(pathJoin("cmake", cmake_ver))
+
+bacio_ver=os.getenv("bacio_ver") or "2.4.1"
+load(pathJoin("bacio", bacio_ver))
+
+g2_ver=os.getenv("g2_ver") or "3.4.5"
+load(pathJoin("g2", g2_ver))
+
+ip_ver=os.getenv("ip_ver") or "4.3.0"
+load(pathJoin("ip", ip_ver))
+
+nemsio_ver=os.getenv("nemsio_ver") or "2.5.4"
+load(pathJoin("nemsio", nemsio_ver))
+
+sp_ver=os.getenv("sp_ver") or "2.5.0"
+load(pathJoin("sp", sp_ver))
+
+w3emc_ver=os.getenv("w3emc_ver") or "2.10.0"
+load(pathJoin("w3emc", w3emc_ver))
+
+-- Uncomment when CHGRES_ALL is ON
+--sfcio_ver=os.getenv("sfcio_ver") or "1.4.1"
+--load(pathJoin("sfcio", sfcio_ver))
+
+sigio_ver=os.getenv("sigio_ver") or "2.3.2"
+load(pathJoin("sigio", sigio_ver))
+
+zlib_ver=os.getenv("zlib_ver") or "1.2.13"
+load(pathJoin("zlib", zlib_ver))
+
+png_ver=os.getenv("png_ver") or "1.6.37"
+load(pathJoin("libpng", png_ver))
+
+netcdf_c_ver=os.getenv("netcdf_c_ver") or "4.9.2"
+load(pathJoin("netcdf-c", netcdf_c_ver))
+
+netcdf_fortran_ver=os.getenv("netcdf_fortran_ver") or "4.6.1"
+load(pathJoin("netcdf-fortran", netcdf_fortran_ver))
+
+nccmp_ver=os.getenv("nccmp_ver") or "1.9.0.1"
+load(pathJoin("nccmp", nccmp_ver))
+
+esmf_ver=os.getenv("esmf_ver") or "8.6.0"
+load(pathJoin("esmf", esmf_ver))
+
+nco_ver=os.getenv("nco_ver") or "5.0.6"
+load(pathJoin("nco", nco_ver))
+
+setenv("I_MPI_CC", "icx")
+setenv("I_MPI_F90", "ifx")
+
+setenv("CC", "mpiicc")
+setenv("FC", "mpiifort")
+
+whatis("Description: UFS_UTILS build environment")
diff --git a/reg_tests/chgres_cube/driver.hera.sh b/reg_tests/chgres_cube/driver.hera.sh
index 86bf372b4..df9a7c065 100755
--- a/reg_tests/chgres_cube/driver.hera.sh
+++ b/reg_tests/chgres_cube/driver.hera.sh
@@ -29,7 +29,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/reg_tests/chgres_cube/driver.hercules.sh b/reg_tests/chgres_cube/driver.hercules.sh
index 05e80bfc5..458ed0a39 100755
--- a/reg_tests/chgres_cube/driver.hercules.sh
+++ b/reg_tests/chgres_cube/driver.hercules.sh
@@ -29,7 +29,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 ulimit -s unlimited
diff --git a/reg_tests/chgres_cube/driver.orion.sh b/reg_tests/chgres_cube/driver.orion.sh
index 2c57df30b..7211af659 100755
--- a/reg_tests/chgres_cube/driver.orion.sh
+++ b/reg_tests/chgres_cube/driver.orion.sh
@@ -27,7 +27,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 ulimit -s unlimited
diff --git a/reg_tests/cpld_gridgen/rt.sh b/reg_tests/cpld_gridgen/rt.sh
index 9beea531b..3844ae757 100755
--- a/reg_tests/cpld_gridgen/rt.sh
+++ b/reg_tests/cpld_gridgen/rt.sh
@@ -108,14 +108,20 @@ TESTS_FILE="$PATHRT/rt.conf"
 export TEST_NAME=
 
 # for C3072 on hera, use WLCLK=60 and MEM="--exclusive"
-WLCLK_dflt=35
+WLCLK_dflt=50
 export WLCLK=$WLCLK_dflt
 MEM_dflt="--mem=16g"
 export MEM=$MEM_dflt
 
 cd $PATHRT
-export compiler=${compiler:-intel}
+export compiler=${compiler:-intelllvm}
 source $PATHTR/sorc/machine-setup.sh >/dev/null 2>&1
+if [[ "$compiler" == "intelllvm" ]]; then
+  if [[ ! -f ${PATHTR}/modulefiles/build.$target.$compiler.lua ]];then
+     echo "IntelLLVM not available. Will use Intel Classic."
+    compiler=intel
+  fi
+fi
 echo "Machine: $target"
 echo "Compiler: $compiler"
 
diff --git a/reg_tests/global_cycle/driver.hera.sh b/reg_tests/global_cycle/driver.hera.sh
index b0f4f938c..bb2d87fc8 100755
--- a/reg_tests/global_cycle/driver.hera.sh
+++ b/reg_tests/global_cycle/driver.hera.sh
@@ -20,7 +20,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/reg_tests/global_cycle/driver.hercules.sh b/reg_tests/global_cycle/driver.hercules.sh
index db1cf8431..f6d5abccd 100755
--- a/reg_tests/global_cycle/driver.hercules.sh
+++ b/reg_tests/global_cycle/driver.hercules.sh
@@ -22,7 +22,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 ulimit -s unlimited
diff --git a/reg_tests/global_cycle/driver.orion.sh b/reg_tests/global_cycle/driver.orion.sh
index 472608dcf..f5cf0361d 100755
--- a/reg_tests/global_cycle/driver.orion.sh
+++ b/reg_tests/global_cycle/driver.orion.sh
@@ -22,7 +22,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 export WORK_DIR="${WORK_DIR:-/work/noaa/stmp/$LOGNAME}"
diff --git a/reg_tests/grid_gen/driver.hera.sh b/reg_tests/grid_gen/driver.hera.sh
index 00dbc1e79..5449316bf 100755
--- a/reg_tests/grid_gen/driver.hera.sh
+++ b/reg_tests/grid_gen/driver.hera.sh
@@ -21,7 +21,7 @@
 #
 #-----------------------------------------------------------------------------
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/reg_tests/grid_gen/driver.hercules.sh b/reg_tests/grid_gen/driver.hercules.sh
index b5da4c807..54095354b 100755
--- a/reg_tests/grid_gen/driver.hercules.sh
+++ b/reg_tests/grid_gen/driver.hercules.sh
@@ -24,7 +24,7 @@
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 set -x
diff --git a/reg_tests/grid_gen/driver.orion.sh b/reg_tests/grid_gen/driver.orion.sh
index e41f1c40d..2a529d806 100755
--- a/reg_tests/grid_gen/driver.orion.sh
+++ b/reg_tests/grid_gen/driver.orion.sh
@@ -23,7 +23,7 @@
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 set -x
diff --git a/reg_tests/ice_blend/driver.hera.sh b/reg_tests/ice_blend/driver.hera.sh
index ec31d773f..7a6fb4c86 100755
--- a/reg_tests/ice_blend/driver.hera.sh
+++ b/reg_tests/ice_blend/driver.hera.sh
@@ -29,7 +29,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/reg_tests/ice_blend/driver.hercules.sh b/reg_tests/ice_blend/driver.hercules.sh
index f541ac367..46c3f35e6 100755
--- a/reg_tests/ice_blend/driver.hercules.sh
+++ b/reg_tests/ice_blend/driver.hercules.sh
@@ -31,7 +31,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 ulimit -s unlimited
diff --git a/reg_tests/ice_blend/driver.orion.sh b/reg_tests/ice_blend/driver.orion.sh
index d5704b5ab..8ab6a7fe7 100755
--- a/reg_tests/ice_blend/driver.orion.sh
+++ b/reg_tests/ice_blend/driver.orion.sh
@@ -31,7 +31,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module load grib-util/1.3.0
 module load wgrib2/2.0.8
 module list
diff --git a/reg_tests/ocnice_prep/rt.sh b/reg_tests/ocnice_prep/rt.sh
index fe700195d..75ee4821e 100755
--- a/reg_tests/ocnice_prep/rt.sh
+++ b/reg_tests/ocnice_prep/rt.sh
@@ -112,11 +112,18 @@ export WLCLK=$WLCLK_dflt
 MEM_dflt="--mem=24g"
 export MEM=$MEM_dflt
 
-cd $PATHRT
-export compiler=${compiler:-intel}
+set -x
 source $PATHTR/sorc/machine-setup.sh >/dev/null 2>&1
+export compiler=${compiler:-intelllvm}
+if [[ "$compiler" == "intelllvm" ]]; then
+  if [[ ! -f ${PATHTR}/modulefiles/build.$target.$compiler.lua ]];then
+     echo "IntelLLVM not available. Will use Intel Classic."
+    compiler=intel
+  fi
+fi
 echo "Machine: $target"
 echo "Compiler: $compiler"
+cd $PATHRT
 
 COMPILE_LOG=compile.log
 REGRESSIONTEST_LOG=RegressionTests_$target.$compiler.log
@@ -158,8 +165,8 @@ elif [[ $target = hercules ]]; then
     BASELINE_ROOT=/work/noaa/nems/role-nems/ufs_utils.hercules/reg_tests/ocnice_prep/baseline_data
     WEIGHTS_ROOT=/work/noaa/nems/role-nems/ufs_utils.hercules/reg_tests/cpld_gridgen/baseline_data
     INPUT_ROOT=/work/noaa/nems/role-nems/ufs_utils.hercules/reg_tests/ocnice_prep/input_data
-    ACCOUNT=${ACCOUNT:-nems}
-    QUEUE=${QUEUE:-batch}
+    ACCOUNT=${ACCOUNT:-fv3-cpu}
+    QUEUE=${QUEUE:-debug}
     NCCMP=nccmp
     PARTITION=hercules
     ulimit -s unlimited
diff --git a/reg_tests/snow2mdl/driver.hera.sh b/reg_tests/snow2mdl/driver.hera.sh
index f2c07ba5a..e0996f47d 100755
--- a/reg_tests/snow2mdl/driver.hera.sh
+++ b/reg_tests/snow2mdl/driver.hera.sh
@@ -20,7 +20,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/reg_tests/snow2mdl/driver.hercules.sh b/reg_tests/snow2mdl/driver.hercules.sh
index ea64eecbf..03f5a301a 100755
--- a/reg_tests/snow2mdl/driver.hercules.sh
+++ b/reg_tests/snow2mdl/driver.hercules.sh
@@ -22,7 +22,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 ulimit -s unlimited
diff --git a/reg_tests/snow2mdl/driver.orion.sh b/reg_tests/snow2mdl/driver.orion.sh
index 8d4b40f7a..2797c16b8 100755
--- a/reg_tests/snow2mdl/driver.orion.sh
+++ b/reg_tests/snow2mdl/driver.orion.sh
@@ -22,7 +22,7 @@ set -x
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module load grib-util/1.3.0
 module load wgrib2/2.0.8
 module list
diff --git a/reg_tests/weight_gen/driver.hera.sh b/reg_tests/weight_gen/driver.hera.sh
index ae8131f38..d88011cc7 100755
--- a/reg_tests/weight_gen/driver.hera.sh
+++ b/reg_tests/weight_gen/driver.hera.sh
@@ -29,7 +29,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/reg_tests/weight_gen/driver.hercules.sh b/reg_tests/weight_gen/driver.hercules.sh
index 369796d61..afa5c0d84 100755
--- a/reg_tests/weight_gen/driver.hercules.sh
+++ b/reg_tests/weight_gen/driver.hercules.sh
@@ -29,7 +29,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/reg_tests/weight_gen/driver.orion.sh b/reg_tests/weight_gen/driver.orion.sh
index 43b6f0b92..a660e2e64 100755
--- a/reg_tests/weight_gen/driver.orion.sh
+++ b/reg_tests/weight_gen/driver.orion.sh
@@ -29,7 +29,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
diff --git a/sorc/chgres_cube.fd/CMakeLists.txt b/sorc/chgres_cube.fd/CMakeLists.txt
index 94f0906bc..4ff86450f 100644
--- a/sorc/chgres_cube.fd/CMakeLists.txt
+++ b/sorc/chgres_cube.fd/CMakeLists.txt
@@ -25,7 +25,7 @@ set(exe_src chgres.F90)
 
 add_subdirectory(msis2.1.fd)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/sorc/cpld_gridgen.fd/CMakeLists.txt b/sorc/cpld_gridgen.fd/CMakeLists.txt
index c4e99ae63..415b8be44 100644
--- a/sorc/cpld_gridgen.fd/CMakeLists.txt
+++ b/sorc/cpld_gridgen.fd/CMakeLists.txt
@@ -21,7 +21,7 @@ set(lib_src
 
 set(exe_src gen_fixgrid.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/sorc/emcsfc_snow2mdl.fd/CMakeLists.txt b/sorc/emcsfc_snow2mdl.fd/CMakeLists.txt
index 08997374c..f3e1ca206 100644
--- a/sorc/emcsfc_snow2mdl.fd/CMakeLists.txt
+++ b/sorc/emcsfc_snow2mdl.fd/CMakeLists.txt
@@ -12,7 +12,7 @@ set(lib_src
 
 set(exe_src driver.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -convert big_endian -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8 -fconvert=big-endian")
diff --git a/sorc/fre-nctools.fd/shared_lib/create_xgrid.c b/sorc/fre-nctools.fd/shared_lib/create_xgrid.c
index 4f4cb71c8..9a25026d4 100644
--- a/sorc/fre-nctools.fd/shared_lib/create_xgrid.c
+++ b/sorc/fre-nctools.fd/shared_lib/create_xgrid.c
@@ -2115,7 +2115,7 @@ double poly_ctrlon(const double x[], const double y[], int n, double clon)
     if( dphi2 > M_PI) dphi2 -= 2.0*M_PI;
     if( dphi2 <-M_PI) dphi2 += 2.0*M_PI;    
 
-    if(abs(dphi2 -dphi1) < M_PI) {
+    if(fabs(dphi2 -dphi1) < M_PI) {
       ctrlon -= dphi * (dphi1*f1+dphi2*f2)/2.0;
     }
     else {
@@ -2123,7 +2123,7 @@ double poly_ctrlon(const double x[], const double y[], int n, double clon)
 	fac = M_PI;
       else
 	fac = -M_PI;
-      fint = f1 + (f2-f1)*(fac-dphi1)/abs(dphi);
+      fint = f1 + (f2-f1)*(fac-dphi1)/fabs(dphi);
       ctrlon -= 0.5*dphi1*(dphi1-fac)*f1 - 0.5*dphi2*(dphi2+fac)*f2
 	+ 0.5*fac*(dphi1+dphi2)*fint;
 	}
@@ -2183,7 +2183,7 @@ double box_ctrlon(double ll_lon, double ll_lat, double ur_lon, double ur_lat, do
     if( dphi2 > M_PI) dphi2 -= 2.0*M_PI;
     if( dphi2 <-M_PI) dphi2 += 2.0*M_PI;    
 
-    if(abs(dphi2 -dphi1) < M_PI) {
+    if(fabs(dphi2 -dphi1) < M_PI) {
       ctrlon -= dphi * (dphi1*f1+dphi2*f2)/2.0;
     }
     else {
@@ -2191,7 +2191,7 @@ double box_ctrlon(double ll_lon, double ll_lat, double ur_lon, double ur_lat, do
 	fac = M_PI;
       else
 	fac = -M_PI;
-      fint = f1 + (f2-f1)*(fac-dphi1)/abs(dphi);
+      fint = f1 + (f2-f1)*(fac-dphi1)/fabs(dphi);
       ctrlon -= 0.5*dphi1*(dphi1-fac)*f1 - 0.5*dphi2*(dphi2+fac)*f2
 	+ 0.5*fac*(dphi1+dphi2)*fint;
     }
diff --git a/sorc/fre-nctools.fd/shared_lib/interp.c b/sorc/fre-nctools.fd/shared_lib/interp.c
index 1e4381cb7..c52474e47 100644
--- a/sorc/fre-nctools.fd/shared_lib/interp.c
+++ b/sorc/fre-nctools.fd/shared_lib/interp.c
@@ -78,7 +78,7 @@ End slopes
      d[0] = 0.0;
   }
   else {
-     if ( delta[0]*delta[1] < 0.0 && abs(d[0]) > abs(3.0*delta[0])) {
+     if ( delta[0]*delta[1] < 0.0 && fabs(d[0]) > fabs(3.0*delta[0])) {
         d[0]=3.0*delta[0];
      }
   }
@@ -88,7 +88,7 @@ End slopes
      d[kmax] = 0.0;
   }
   else {
-     if ( delta[kmax-1]*delta[kmax-2] < 0.0 && abs(d[kmax]) > abs(3.0*delta[kmax-1])) {
+     if ( delta[kmax-1]*delta[kmax-2] < 0.0 && fabs(d[kmax]) > fabs(3.0*delta[kmax-1])) {
         d[kmax]=3.0*delta[kmax-1];
      }
   }
diff --git a/sorc/fre-nctools.fd/shared_lib/mosaic_util.c b/sorc/fre-nctools.fd/shared_lib/mosaic_util.c
index 99868ba71..9751a4268 100644
--- a/sorc/fre-nctools.fd/shared_lib/mosaic_util.c
+++ b/sorc/fre-nctools.fd/shared_lib/mosaic_util.c
@@ -528,8 +528,8 @@ double spherical_angle(const double *v1, const double *v2, const double *v3)
     angle = 0. ;
   else {
     ddd = (px*qx+py*qy+pz*qz) / sqrt(ddd);
-    if( fabs(ddd-1) < EPSLN30 ) ddd = 1;
-    if( fabs(ddd+1) < EPSLN30 ) ddd = -1;
+    if( fabsl(ddd-1) < EPSLN30 ) ddd = 1;
+    if( fabsl(ddd+1) < EPSLN30 ) ddd = -1;
     if ( ddd>1. || ddd<-1. ) {
       /*FIX (lmh) to correctly handle co-linear points (angle near pi or 0) */
       if (ddd < 0.)
@@ -731,7 +731,7 @@ int invert_matrix_3x3(long double m[], long double m_inv[]) {
 #ifdef test_invert_matrix_3x3
   printf("det = %Lf\n", det);
 #endif  
-  if (fabs(det) < EPSLN15 ) return 0;
+  if (fabsl(det) < EPSLN15 ) return 0;
 
   const long double deti = 1.0/det;
 
diff --git a/sorc/fre-nctools.fd/tools/make_hgrid/make_hgrid.c b/sorc/fre-nctools.fd/tools/make_hgrid/make_hgrid.c
index 06fcff476..ccde3aa5e 100644
--- a/sorc/fre-nctools.fd/tools/make_hgrid/make_hgrid.c
+++ b/sorc/fre-nctools.fd/tools/make_hgrid/make_hgrid.c
@@ -1037,7 +1037,7 @@ int main(int argc, char* argv[])
     }
     }
     
-    if (verbose) fprintf(stderr, "[INFO] Allocating arrays of size %d for x, y based on nxp: %d nyp: %d ntiles: %d\n", size1, nxp, nyp, ntiles);
+    if (verbose) fprintf(stderr, "[INFO] Allocating arrays of size %lu for x, y based on nxp: %d nyp: %d ntiles: %d\n", size1, nxp, nyp, ntiles);
     x        = (double *) malloc(size1*sizeof(double));
     y        = (double *) malloc(size1*sizeof(double));
     area     = (double *) malloc(size4*sizeof(double));
@@ -1198,7 +1198,7 @@ int main(int argc, char* argv[])
 
       if(out_halo ==0) {
         if (verbose) {
-          fprintf(stderr, "[INFO] START NC XARRAY write out_halo=0 tile number = n: %d offset = pos_c: %d\n", n, pos_c);
+          fprintf(stderr, "[INFO] START NC XARRAY write out_halo=0 tile number = n: %d offset = pos_c: %ld\n", n, pos_c);
           fprintf(stderr, "[INFO] XARRAY: n: %d x[0]: %f x[1]: %f x[2]: %f x[3]: %f x[4]: %f x[5]: %f x[10]: %f\n",
                   n, x[pos_c], x[pos_c+1], x[pos_c+2], x[pos_c+3], x[pos_c+4], x[pos_c+5], x[pos_c+10]);
           if (n > 0) fprintf(stderr, "[INFO] XARRAY: n: %d x[0]: %f x[-1]: %f x[-2]: %f x[-3]: %f x[-4]: %f x[-5]: %f x[-10]: %f\n",
@@ -1259,9 +1259,9 @@ int main(int argc, char* argv[])
       nxp = nx + 1;
       nyp = ny + 1;
 
-      if (verbose) fprintf(stderr, "[INFO] INDEX Before increment n: %d pos_c %d nxp %d nyp %d nxp*nyp %d\n", n, pos_c, nxp, nyp, nxp*nyp);
+      if (verbose) fprintf(stderr, "[INFO] INDEX Before increment n: %d pos_c %ld nxp %d nyp %d nxp*nyp %d\n", n, pos_c, nxp, nyp, nxp*nyp);
       pos_c += nxp*nyp;
-      if (verbose) fprintf(stderr, "[INFO] INDEX After increment n: %d pos_c %d.\n", n, pos_c);
+      if (verbose) fprintf(stderr, "[INFO] INDEX After increment n: %d pos_c %ld.\n", n, pos_c);
       pos_e += nxp*ny;
       pos_n += nx*nyp;
       pos_t += nx*ny;
diff --git a/sorc/fvcom_tools.fd/CMakeLists.txt b/sorc/fvcom_tools.fd/CMakeLists.txt
index 97c66afff..0728f2d1c 100644
--- a/sorc/fvcom_tools.fd/CMakeLists.txt
+++ b/sorc/fvcom_tools.fd/CMakeLists.txt
@@ -10,7 +10,7 @@ set(fortran_src
 
 set(exe_src process_FVCOM.f90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU|Clang|AppleClang)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/sorc/gblevents.fd/CMakeLists.txt b/sorc/gblevents.fd/CMakeLists.txt
index 22086de19..42835ed38 100644
--- a/sorc/gblevents.fd/CMakeLists.txt
+++ b/sorc/gblevents.fd/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8")
   set(CMAKE_Fortran_FLAGS_RELEASE "-O3")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
diff --git a/sorc/global_cycle.fd/CMakeLists.txt b/sorc/global_cycle.fd/CMakeLists.txt
index f52c2d86d..f8120f00a 100644
--- a/sorc/global_cycle.fd/CMakeLists.txt
+++ b/sorc/global_cycle.fd/CMakeLists.txt
@@ -13,7 +13,7 @@ set(lib_src
 
 set(exe_src cycle.f90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8")
diff --git a/sorc/grid_tools.fd/filter_topo.fd/CMakeLists.txt b/sorc/grid_tools.fd/filter_topo.fd/CMakeLists.txt
index e8789caaf..229440a3e 100644
--- a/sorc/grid_tools.fd/filter_topo.fd/CMakeLists.txt
+++ b/sorc/grid_tools.fd/filter_topo.fd/CMakeLists.txt
@@ -4,7 +4,7 @@ set(lib_src
 set(exe_src
     filter_topo.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -assume byterecl -real-size 64 -fno-alias -stack-temps -safe-cray-ptr -ftz")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/sorc/lsm_routines.fd/noah.fd/CMakeLists.txt b/sorc/lsm_routines.fd/noah.fd/CMakeLists.txt
index daa252e56..3e159b10e 100644
--- a/sorc/lsm_routines.fd/noah.fd/CMakeLists.txt
+++ b/sorc/lsm_routines.fd/noah.fd/CMakeLists.txt
@@ -8,7 +8,7 @@ set(fortran_src
     sflx_snippet.f90
     bulk_snow_module.f90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -convert big_endian")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8 -fconvert=big-endian")
diff --git a/sorc/ocean_merge.fd/CMakeLists.txt b/sorc/ocean_merge.fd/CMakeLists.txt
index 60d0a6b46..661060a19 100644
--- a/sorc/ocean_merge.fd/CMakeLists.txt
+++ b/sorc/ocean_merge.fd/CMakeLists.txt
@@ -2,7 +2,7 @@ list(APPEND fortran_src
   merge_lake_ocnmsk.f90
 )
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -i4 -convert big_endian")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8")
diff --git a/sorc/ocnice_prep.fd/CMakeLists.txt b/sorc/ocnice_prep.fd/CMakeLists.txt
index 86f954ed4..98d1279f8 100644
--- a/sorc/ocnice_prep.fd/CMakeLists.txt
+++ b/sorc/ocnice_prep.fd/CMakeLists.txt
@@ -13,7 +13,7 @@ set(lib_src
 
 set(exe_src ocniceprep.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/sorc/orog_mask_tools.fd/inland.fd/CMakeLists.txt b/sorc/orog_mask_tools.fd/inland.fd/CMakeLists.txt
index 189cd17e7..d116090e2 100644
--- a/sorc/orog_mask_tools.fd/inland.fd/CMakeLists.txt
+++ b/sorc/orog_mask_tools.fd/inland.fd/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(lib_src nb.F90)
 set(exe_src inland.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fno-range-check")
diff --git a/sorc/orog_mask_tools.fd/lake.fd/CMakeLists.txt b/sorc/orog_mask_tools.fd/lake.fd/CMakeLists.txt
index 1b9b2108f..f558a74ef 100644
--- a/sorc/orog_mask_tools.fd/lake.fd/CMakeLists.txt
+++ b/sorc/orog_mask_tools.fd/lake.fd/CMakeLists.txt
@@ -4,7 +4,7 @@ set(lib_src
 
 set(exe_src lakefrac.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fno-range-check")
diff --git a/sorc/orog_mask_tools.fd/orog.fd/CMakeLists.txt b/sorc/orog_mask_tools.fd/orog.fd/CMakeLists.txt
index 955101450..7d197c593 100644
--- a/sorc/orog_mask_tools.fd/orog.fd/CMakeLists.txt
+++ b/sorc/orog_mask_tools.fd/orog.fd/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(lib_src io_utils.F90 orog_utils.F90)
 set(exe_src mtnlm7_oclsm.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -convert big_endian -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8 -fconvert=big-endian -fno-range-check")
diff --git a/sorc/orog_mask_tools.fd/orog_gsl.fd/CMakeLists.txt b/sorc/orog_mask_tools.fd/orog_gsl.fd/CMakeLists.txt
index e37889f46..3149cc21f 100644
--- a/sorc/orog_mask_tools.fd/orog_gsl.fd/CMakeLists.txt
+++ b/sorc/orog_mask_tools.fd/orog_gsl.fd/CMakeLists.txt
@@ -4,7 +4,7 @@ set(lib_src
 
 set(exe_src gsl_oro_data.f90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8 -fno-range-check")
diff --git a/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/mask.fd/CMakeLists.txt b/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/mask.fd/CMakeLists.txt
index c9d6b34f2..bacaaa8b4 100644
--- a/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/mask.fd/CMakeLists.txt
+++ b/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/mask.fd/CMakeLists.txt
@@ -2,7 +2,7 @@ list(APPEND fortran_src
   mask.f90
 )
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -i4 -convert big_endian")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8")
diff --git a/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/ramp.fd/CMakeLists.txt b/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/ramp.fd/CMakeLists.txt
index 384176eff..9c8a870e4 100644
--- a/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/ramp.fd/CMakeLists.txt
+++ b/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/ramp.fd/CMakeLists.txt
@@ -2,7 +2,7 @@ list(APPEND fortran_src
   ramp.f90
 )
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -i4 -convert big_endian")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8")
diff --git a/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/topo.fd/CMakeLists.txt b/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/topo.fd/CMakeLists.txt
index e34d448ee..d782fd663 100644
--- a/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/topo.fd/CMakeLists.txt
+++ b/sorc/orog_mask_tools.fd/orog_netcdf_tools.fd/topo.fd/CMakeLists.txt
@@ -2,7 +2,7 @@ list(APPEND fortran_src
   topo.f90
 )
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -i4 -convert big_endian")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8")
diff --git a/sorc/sfc_climo_gen.fd/CMakeLists.txt b/sorc/sfc_climo_gen.fd/CMakeLists.txt
index a9103106f..aa0f3c217 100644
--- a/sorc/sfc_climo_gen.fd/CMakeLists.txt
+++ b/sorc/sfc_climo_gen.fd/CMakeLists.txt
@@ -17,7 +17,7 @@ set(lib_src
 
 set(exe_src driver.F90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/sorc/vcoord_gen.fd/CMakeLists.txt b/sorc/vcoord_gen.fd/CMakeLists.txt
index 328e2ab15..b5ac92627 100644
--- a/sorc/vcoord_gen.fd/CMakeLists.txt
+++ b/sorc/vcoord_gen.fd/CMakeLists.txt
@@ -10,7 +10,7 @@ set(lib_src
 
 set(exe_src driver.f90)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8")
diff --git a/sorc/weight_gen.fd/CMakeLists.txt b/sorc/weight_gen.fd/CMakeLists.txt
index ce0190650..4c408d441 100644
--- a/sorc/weight_gen.fd/CMakeLists.txt
+++ b/sorc/weight_gen.fd/CMakeLists.txt
@@ -2,7 +2,7 @@ list(APPEND fortran_src
   scrip.F90
 )
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -i4 -convert big_endian")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-real-8")
diff --git a/tests/chgres_cube/CMakeLists.txt b/tests/chgres_cube/CMakeLists.txt
index a5bb4ffff..55ebe2b96 100644
--- a/tests/chgres_cube/CMakeLists.txt
+++ b/tests/chgres_cube/CMakeLists.txt
@@ -20,7 +20,7 @@ endforeach()
 
 include (LibMPI)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/tests/chgres_cube/ftst_read_atm_grib2.F90 b/tests/chgres_cube/ftst_read_atm_grib2.F90
index 7d19ffeb9..d89ffd9db 100644
--- a/tests/chgres_cube/ftst_read_atm_grib2.F90
+++ b/tests/chgres_cube/ftst_read_atm_grib2.F90
@@ -241,7 +241,7 @@ program read_atm_grib2
  if (abs(data3d_one_tile(i_check(2),j_check(2),k_check(2)) - expected_values_zwind(2)) > EPSILON) stop 29
 
  call ESMF_FieldGather(ps_input_grid, data_one_tile, rootPet=0, rc=rc)
- if (abs(data_one_tile(i_check(1),j_check(1)) - expected_values_ps(1)) > EPSILON) stop 32
+ if (abs(data_one_tile(i_check(1),j_check(1)) - expected_values_ps(1)) > (20.0*EPSILON)) stop 32
 
  call ESMF_FieldGather(terrain_input_grid, data_one_tile, rootPet=0, rc=rc)
  if (abs(data_one_tile(i_check(1),j_check(1)) - expected_values_terrain(1)) > EPSILON) stop 34
diff --git a/tests/cpld_gridgen/CMakeLists.txt b/tests/cpld_gridgen/CMakeLists.txt
index 62bffce77..2554db027 100644
--- a/tests/cpld_gridgen/CMakeLists.txt
+++ b/tests/cpld_gridgen/CMakeLists.txt
@@ -9,7 +9,7 @@ set(GRID_FILE "ocean_hgrid.nc")
 
 PULL_DATA(${CPLDGRIDGEN_URL} ${GRID_FILE})
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/tests/emcsfc_snow2mdl/CMakeLists.txt b/tests/emcsfc_snow2mdl/CMakeLists.txt
index ae43bf418..788423eb1 100644
--- a/tests/emcsfc_snow2mdl/CMakeLists.txt
+++ b/tests/emcsfc_snow2mdl/CMakeLists.txt
@@ -3,7 +3,7 @@
 #
 # George Gayno
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/tests/filter_topo/CMakeLists.txt b/tests/filter_topo/CMakeLists.txt
index 0928b3e24..33bd0039a 100644
--- a/tests/filter_topo/CMakeLists.txt
+++ b/tests/filter_topo/CMakeLists.txt
@@ -3,8 +3,8 @@
 #
 # George Gayno, Ed Hartnett
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
-  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -real-size 64 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
 endif()
diff --git a/tests/fre-nctools/shared_lib/CMakeLists.txt b/tests/fre-nctools/shared_lib/CMakeLists.txt
index 5827563c2..8054a6482 100644
--- a/tests/fre-nctools/shared_lib/CMakeLists.txt
+++ b/tests/fre-nctools/shared_lib/CMakeLists.txt
@@ -8,9 +8,3 @@ include_directories(${CMAKE_SOURCE_DIR}/sorc/fre-nctools.fd/shared_lib)
 add_executable(tst_create_xgrid tst_create_xgrid.c)
 add_test(NAME fre-nctools-tst_create_xgrid COMMAND tst_create_xgrid)
 target_link_libraries(tst_create_xgrid NetCDF::NetCDF_C shared_lib m)
-
-
-
-
-
-
diff --git a/tests/fre-nctools/shared_lib/tst_create_xgrid.c b/tests/fre-nctools/shared_lib/tst_create_xgrid.c
index 7fd0ae58b..561d76026 100644
--- a/tests/fre-nctools/shared_lib/tst_create_xgrid.c
+++ b/tests/fre-nctools/shared_lib/tst_create_xgrid.c
@@ -4,6 +4,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "mosaic_util.h"
+#include "create_xgrid.h"
+
 #define D2R (M_PI/180)
 #define R2D (180/M_PI)
 #define MAXPOINT 1000
@@ -495,7 +498,7 @@ int main(int argc, char* argv[])
                 }
 
                 area1 = (double *)malloc((nlon1)*(nlat1)*sizeof(double));
-                get_grid_great_circle_area_(&nlon1, &nlat1, lon1_in, lat1_in, area1);
+                get_grid_great_circle_area(&nlon1, &nlat1, lon1_in, lat1_in, area1);
 
                 printf("xgrid area sum is %g, grid 1 area is %g\n", area_sum, area1[0]);
             }
diff --git a/tests/fvcom_tools/CMakeLists.txt b/tests/fvcom_tools/CMakeLists.txt
index 125d2c956..dc3ccb41c 100644
--- a/tests/fvcom_tools/CMakeLists.txt
+++ b/tests/fvcom_tools/CMakeLists.txt
@@ -12,7 +12,7 @@ foreach(THE_FILE IN LISTS FVCOM_FILE SFCDATA_FILE)
   PULL_DATA(${FVCOM_URL} ${THE_FILE})
 endforeach()
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/tests/global_cycle/CMakeLists.txt b/tests/global_cycle/CMakeLists.txt
index 7937d229c..2396f97d3 100644
--- a/tests/global_cycle/CMakeLists.txt
+++ b/tests/global_cycle/CMakeLists.txt
@@ -19,7 +19,7 @@ endforeach()
 # Include cmake to allow parallel I/O tests.
 include (LibMPI)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/tests/ocnice_prep/CMakeLists.txt b/tests/ocnice_prep/CMakeLists.txt
index 622d647d0..de13267e6 100644
--- a/tests/ocnice_prep/CMakeLists.txt
+++ b/tests/ocnice_prep/CMakeLists.txt
@@ -3,7 +3,7 @@
 #
 # George Gayno, Ed Hartnett
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/tests/orog/CMakeLists.txt b/tests/orog/CMakeLists.txt
index b1bd2179b..863a4d47d 100644
--- a/tests/orog/CMakeLists.txt
+++ b/tests/orog/CMakeLists.txt
@@ -2,7 +2,7 @@
 #
 # George Gayno, Ed Hartnett
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/tests/sfc_climo_gen/CMakeLists.txt b/tests/sfc_climo_gen/CMakeLists.txt
index 0067900d7..2c6dccf3b 100644
--- a/tests/sfc_climo_gen/CMakeLists.txt
+++ b/tests/sfc_climo_gen/CMakeLists.txt
@@ -20,7 +20,7 @@ PULL_DATA(${SFCGEN2_URL} ${VEG_FILE})
 # Include cmake to allow parallel I/O tests.
 include (LibMPI)
 
-if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
diff --git a/util/gdas_init/driver.hera.sh b/util/gdas_init/driver.hera.sh
index 9f2387835..faa244d07 100755
--- a/util/gdas_init/driver.hera.sh
+++ b/util/gdas_init/driver.hera.sh
@@ -8,7 +8,7 @@
 
 set -x
 
-compiler=${compiler:-"intel"}
+compiler=${compiler:-"intelllvm"}
 source ../../sorc/machine-setup.sh > /dev/null 2>&1
 module use ../../modulefiles
 module load build.$target.$compiler
diff --git a/util/sfc_climo_gen/sfc_gen.sh b/util/sfc_climo_gen/sfc_gen.sh
index 18c93d8ed..762fd11f4 100755
--- a/util/sfc_climo_gen/sfc_gen.sh
+++ b/util/sfc_climo_gen/sfc_gen.sh
@@ -117,7 +117,11 @@ ulimit -s unlimited
 
 source ${BASE_DIR}/sorc/machine-setup.sh > /dev/null 2>&1
 module use ${BASE_DIR}/modulefiles
-module load build.$target.intel
+if [[ -f ${BASE_DIR}/modulefiles/build.$target.intelllvm.lua ]]; then
+  module load build.$target.intelllvm
+else
+  module load build.$target.intel
+fi
 module list
 
 rm -fr $WORK_DIR $SAVE_DIR
diff --git a/util/weight_gen/run.hera.sh b/util/weight_gen/run.hera.sh
index d3b68f3dc..5e216ba80 100755
--- a/util/weight_gen/run.hera.sh
+++ b/util/weight_gen/run.hera.sh
@@ -34,7 +34,7 @@ set -x
 UFS_DIR=$PWD/../..
 source $UFS_DIR/sorc/machine-setup.sh > /dev/null 2>&1
 module use $UFS_DIR/modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 export CRES="C48"
diff --git a/util/weight_gen/run.hercules.sh b/util/weight_gen/run.hercules.sh
index 59e7841c7..792ef43a6 100755
--- a/util/weight_gen/run.hercules.sh
+++ b/util/weight_gen/run.hercules.sh
@@ -34,7 +34,7 @@ set -x
 UFS_DIR=$PWD/../..
 source $UFS_DIR/sorc/machine-setup.sh > /dev/null 2>&1
 module use $UFS_DIR/modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 export CRES="C48"
diff --git a/util/weight_gen/run.orion.sh b/util/weight_gen/run.orion.sh
index 67c35dee8..d4964a4c4 100755
--- a/util/weight_gen/run.orion.sh
+++ b/util/weight_gen/run.orion.sh
@@ -34,7 +34,7 @@ set -x
 UFS_DIR=$PWD/../..
 source $UFS_DIR/sorc/machine-setup.sh > /dev/null 2>&1
 module use $UFS_DIR/modulefiles
-module load build.$target.intel
+module load build.$target.intelllvm
 module list
 
 export CRES="C48"