--- MITgcm/tools/f90mkdepend	2008/05/08 19:45:38	1.2
+++ MITgcm/tools/f90mkdepend	2010/05/03 14:35:01	1.6
@@ -1,27 +1,38 @@
-#!/bin/csh -f
+#!/bin/bash
+# $Header: /home/ubuntu/mnt/e9_copy/MITgcm/tools/f90mkdepend,v 1.6 2010/05/03 14:35:01 jahn Exp $
+# $Name:  $
 #
 # Generate some make file dependency entries for a Fortran 90 file that employs "use".
-# Note: We assume that the name of a module and the same of source are the same.
 #
-set flist =  ( `echo *.F90 *.F *.h` )
-foreach filename ( $flist )
-set dirlist  =  (  . )
-
-# Try and find some use statements
-set modreflist = `cat $filename | grep '[ *] use ' | awk '{print $2}' | sed s'/,//'`
-
-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
+# 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
+
+for filename in *.F90 *.F *.h; do
+  # quick check for "use" to speed up processing
+  if grep -i '^ *use ' $filename > /dev/null; then
+    # extract module name in lower case
+    modreflist=$(grep -i '^ *use ' $filename | awk '{print tolower($2)}' | sed 's/,.*$//') 
+
+    echo "$filename => $modreflist" >> f90mkdepend.log
+
+    # change .F90 into .f90, .F into .f for target
+    preprocessed=$(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
+