Clean up GEOS-Chem code in configure based on suggestions from Brian …

…Easton

Signed-off-by: Lizzie Lundgren <[email protected]>

bld/configure

@@ -592,10 +592,9 @@ if (defined $opts{'chem'}) {
 
     # If the user has specified a simple physics package...
     if ($simple_phys) {
-        # the only valid chemistry options are 'none', 'terminator' and 'geoschem'
-        if (($chem_pkg ne 'none') and ($chem_pkg ne 'terminator') and !($chem_pkg =~ 'geoschem')) {
+        if (($chem_pkg ne 'none') and ($chem_pkg ne 'terminator')) {
             die "configure ERROR: -phys=$phys_pkg  -chem=$chem_pkg\n".
-                "                 -chem can only be set to 'none', 'terminator' or 'geoschem'.\n";
+                "                 -chem can only be set to 'none' or 'terminator'.\n";
         }
     }
     elsif ($phys_pkg =~ m/^cam3$|^cam4$|^spcam_sam1mom$/) {
@@ -1408,9 +1407,8 @@ if ($chem_pkg =~ '_mam3') {
     $chem_cppdefs = ' -DMODAL_AERO -DMODAL_AERO_7MODE ';
 }
 
-# Set GEOS-Chem CPP definitions here
+# Customize GEOS-Chem advected species
 if ($chem_pkg =~ 'geoschem') {
-    $chem_cppdefs .= ' -DEXTERNAL_GRID -DEXTERNAL_FORCING';
     if ($chem_pkg eq 'geoschem_mam4') {
         $chem_nadv = 267; # includes GC advected species (233), CO2 (1), and MAM aerosols (33)
     }
@@ -1684,7 +1682,7 @@ elsif ($fc =~ /nvfor/)  { $fc_type = 'nvhpc'; }
 
 # User override for Fortran compiler type
 if (defined $opts{'fc_type'}) { $fc_type = $opts{'fc_type'}; }
-if ($fc_type == "oneapi") {$fc_type = 'intel'; }
+if ($fc_type eq "oneapi") {$fc_type = 'intel'; }
 if ($fc_type) {
     $cfg_ref->set('fc_type', $fc_type);
     if ($print>=2) { print "Fortran compiler type: $fc_type$eol"; }
@@ -1950,6 +1948,13 @@ if ($unicon) { $cfg_cppdefs .= ' -DUSE_UNICON'; }
 #   HEMCO_CESM - indicates CESM model environment. Deprecated, will be removed soon.
 $cfg_cppdefs .= ' -DMODEL_ -DMODEL_CESM -DHEMCO_CESM -DUSE_REAL8 ';
 
+# Compiler CPP definitions for GEOS-Chem
+if ($chem_pkg =~ 'geoschem') {
+    $chem_cppdefs .= ' -DEXTERNAL_GRID -DEXTERNAL_FORCING';
+    if    ($fc_type eq 'intel') { $cfg_cppdefs .= ' -DLINUX_IFORT'; }
+    elsif ($fc_type eq 'gnu')   { $cfg_cppdefs .= ' -DLINUX_GFORTRAN'; }
+}
+
 #-----------------------------------------------------------------------------------------------
 # CPP defines to put on Makefile