source: trunk/server/source4/script/find_unused_makefilevars.pl

#!/usr/bin/perl
# Script that reads in Makefile.in and outputs the names of all 
# used but undefined vars and all defined but unused vars 
# Copyright Jelmer Vernooij <jelmer@samba.org>

# Arguments:
#  1: Makefile.in
#

my %references;
my %defines;

# First, make a list of defines in configure
$in = shift;

sub process_file($)
{
        my ($fn) = @_;
        open(IN, $fn);
        while(<IN>) {
                my $line = $_;
                while($line =~ /^\b([a-zA-Z0-9_][a-zA-Z0-9_]*)\b[ \t]*=.*/sgm) {
                        $defines{$1} = 1;
                }
                while($line =~ /\$\(([a-zA-Z0-9_][a-zA-Z0-9_]*)\)/sgm) {
                        $references{$1} = 1;
                }
                while ($line =~ /^include (.*)/sgm) {
                        process_file($1);
                }
        }
        close IN;
}

process_file($in);

print "##### DEFINED BUT UNUSED: #####\n";
foreach(%defines) {
#    print $_." defined\n";

        if ($_ != 1) {
                if ($references{$_} != 1) {
                        print $_."\n";
                }
        } 
}

print "##### USED BUT UNDEFINED: #####\n";
foreach(%references) {
        if ($_ != 1) {
                if ($defines{$_} != 1) {
                        print $_."\n";
                }
        } 
}