Add script that detects useless AC_DEFINE()'s in configure.in

source/script/find_unused_defines.pl

@@ -0,0 +1,30 @@
+#!/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:
+#  1: configure.in
+#  2: C files pattern
+
+my %symbols;
+
+# First, make a list of defines in configure
+$in = shift;
+
+while($tmp = shift) { 
+	open(FI, $tmp);
+	while(<FI>) { 
+		while(/([A-Za-z0-9_]+)/sgm) { 
+			$symbols{$1} = 1;
+		}
+	}
+	close FI;
+}
+
+open(IN, $in) or die("Can't open $in");
+
+while(<IN>) {
+	if(/AC_DEFINE\(([^,]+),/ and $symbols{$1} != 1) { print "$1\n"; } 
+}
+
+close IN;