+#!/usr/bin/perl
+# Script that reads in configure and outputs the names of all the defines
+# it defines that are used nowhere in the code
+
+# Arguments: C and H files
+
+my %defined,%used,%files;
+
+# First, make a list of defines in configure
+$in = shift;
+
+while($tmp = shift) {
+ $files{$tmp} = $tmp;
+ open(FI, $tmp);
+ while(<FI>) {
+ $line = $_;
+ $cur = "";
+ if(/^#define ([A-Za-z0-9_]+)/) {
+ $defined{$1} = $tmp;
+ $cur = $1;
+ }
+
+ $_ = $line;
+ while(/([A-Za-z0-9_]+)/sgm) {
+ if($cur cmp $1) { $used{$1} = $tmp; }
+ }
+ }
+ close FI;
+}
+
+foreach(keys %defined) {
+ if(!$used{$_}) { print "$_\n"; }
+}