--- MITgcm/tools/f90mkdepend	2008/05/13 19:02:00	1.3
+++ MITgcm/tools/f90mkdepend	2010/04/30 19:55:17	1.4
@@ -1,37 +1,38 @@
-#!/bin/csh -f
-# $Header: /home/ubuntu/mnt/e9_copy/MITgcm/tools/f90mkdepend,v 1.3 2008/05/13 19:02:00 jahn Exp $
+#!/bin/bash
+# $Header: /home/ubuntu/mnt/e9_copy/MITgcm/tools/f90mkdepend,v 1.4 2010/04/30 19:55:17 jahn Exp $
 # $Name:  $
 #
 # Generate some make file dependency entries for a Fortran 90 file that employs "use".
+#
+# For every "use" statement, generate a dependency on lowercase(modulename).o
+#
 # Note: We assume that the name of a module and the same of source are the same.
 #       The name of the source file should be all lower case (except for the extension).
-#
+
+# don't complain if *.F90 doesn't match any files
+shopt -s nullglob
+
 cat /dev/null > f90mkdepend.log
 
-set flist =  ( `echo *.F90 *.F *.h` )
-foreach filename ( $flist )
-  set dirlist  =  (  . )
-
-  # Try and find some use statements
-  cat $filename | grep -i '^ *use ' >> f90mkdepend.log
-  set modreflist = `cat $filename | grep -i '^ *use ' | awk '{print tolower($2)}' | sed s'/,.*$//'`
+for filename in *.F90 *.F *.h; do
+  # quick check for "use" to speed up processing
+  if grep -q -i '^ *use ' $filename; then
+    # extract module name in lower case
+    modreflist=$(grep -i '^ *use ' $filename | awk '{sub(/,.*/,"",$2); print tolower($2)}')
 
-  if ("x$modreflist" != x) then 
     echo "$filename => $modreflist" >> f90mkdepend.log
-  endif
 
-  set depfiles = ( )
-  foreach m ( $modreflist )
-    set depfile = ( )
-    foreach d ( $dirlist )
-      if ( -f $m.F90 || -f $m.F ) then
-       if ( $depfile == "" ) then
-        set depfile = ( $m.o )
-       endif
-      endif
-    end
-    set depfiles = ( $depfiles $depfile )
-  end
-  set ext=`echo ${filename:e} | sed -e 's/F/f/'`
-  echo ${filename:r}.${ext}: $depfiles
-end
+    # change .F90 into .f90, .F into .f for target
+    preprocessed=$(echo $filename | sed -e 's/\.F$/.f/' -e 's/\.F90$/.f90/')
+
+    depline="$preprocessed:"
+    for m in $modreflist; do
+      # ignore modules that don't have an appropriately named source file
+      if [ -f $m.F90 ] || [ -f $m.F ]; then
+        depline="$depline $m.o"
+      fi
+    done
+    echo $depline
+  fi
+done
+