Update build scripts on Gaea-C5 to conform with ufs-wx-model and global-workflow (#1361)

After the recent Gaea-C5 OS upgrade, GDASApp fails to build.
This issue corrects Gaea-C5 build and updates the build scripts to
conform to ufs-wx-model (following ufs-wx-model
ufs-community/ufs-weather-model#2448) and
eventual global-workflow updates.

Refs NOAA-EMC/global-workflow 3011
NOAA-EMC/global-workflow#3011
Refs NOAA-EMC/global-workflow 3032
NOAA-EMC/global-workflow#3032
Resolves #1360

Author: DavidBurrows-NCO

build.sh

@@ -71,7 +71,7 @@ while getopts "p:t:c:hvdfa" opt; do
 done
 
 case ${BUILD_TARGET} in
-  hera | orion | hercules | wcoss2 | noaacloud | gaea | gaeac6 )
+  hera | orion | hercules | wcoss2 | noaacloud | gaeac5 | gaeac6 )
     echo "Building GDASApp on $BUILD_TARGET"
     source $dir_root/ush/module-setup.sh
     module use $dir_root/modulefiles

modulefiles/GDAS/gaea.intel.lua renamed to modulefiles/GDAS/gaeac5.intel.lua

@@ -21,8 +21,8 @@ case $(hostname -f) in
   dlogin0[1-9].dogwood.wcoss2.ncep.noaa.gov) MACHINE_ID=wcoss2 ;; ### dogwood01-9
   dlogin10.dogwood.wcoss2.ncep.noaa.gov)     MACHINE_ID=wcoss2 ;; ### dogwood10
 
-  gaea5[1-8])          MACHINE_ID=gaea ;; ### gaea51-58
-  gaea5[1-8].ncrc.gov) MACHINE_ID=gaea ;; ### gaea51-58
+  gaea5[1-8])          MACHINE_ID=gaeac5 ;; ### gaea51-58
+  gaea5[1-8].ncrc.gov) MACHINE_ID=gaeac5 ;; ### gaea51-58
 
   gaea6[1-8])          MACHINE_ID=gaeac6 ;; ### gaea61-68
   gaea6[1-8].ncrc.gov) MACHINE_ID=gaeac6 ;; ### gaea61-68
@@ -84,9 +84,12 @@ elif [[ -d /work ]]; then
   else
     MACHINE_ID=orion
   fi
-elif [[ -d /gpfs && -d /ncrc ]]; then
-  # We are on GAEA.
-  MACHINE_ID=gaea
+elif [[ -d /gpfs/f5 ]]; then
+  # We are on GAEAC5.
+  MACHINE_ID=gaeac5
+elif [[ -d /gpfs/f6 ]]; then
+  # We are on GAEAC6.
+  MACHINE_ID=gaeac6
 elif [[ -d /data/prod ]]; then
   # We are on SSEC's S4
   MACHINE_ID=s4