#!/usr/bin/perl

# Run this script on the map with cross-reference generated by GNU ld,
# and it will generate a list of symbols that don't need to be global.
# To create the map, run something like this:
# make LDFLAGS=-Wl,-Map,mc.map,--cref

use strict;

if ($#ARGV != 0) {
	print "Usage: unrefglobals.pl mapfile\n";
	exit 1;
}

if (!open (MAP, "$ARGV[0]")) {
	print "Cannot open file \"$ARGV[0]\"\n";
	exit 1;
}

my $line;
my $next_line = <MAP>;
while (1) {
	last unless $next_line;
	$line = $next_line;
	$next_line = <MAP>;
	next unless ($line =~ m{^[A-Za-z_][A-Za-z0-9_]*  +[^ /][^ ]+\.o$} or
		     $line =~ m{^[A-Za-z_][A-Za-z0-9_]*  +[^ ]+\.a\([^ ]+\.o\)$});
	if (!$next_line or ($next_line !~ /^ /)) {
		print $line;
	}
}

close(MAP);