find_unused_makefilevars.pl

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#!/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 <[e-mail]>

# Arguments:
#  1: Makefile.in
#

my %references;
my %defines;

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

open(IN, $in);
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;
	}
}
close 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";
		}
	} 
}