add jim's map2dot tool

tools/map2dot.pl

@@ -0,0 +1,31 @@
+#!/usr/bin/perl
+
+# Try:
+#  gcc -static -o test test.c -Wl,--print-map | perl parse-map.pl | unflatten -l 3 | dot -Tpng > map.png
+#
+# This won't show all edges!  An archive member is only listed the first
+# time it needs to get included.  But this shows at least one reason why each
+# archive member appears in the final object.
+
+my $flag = 0;
+my $line = "";
+print "digraph map {\n";
+print "rankdir = LR;";
+while(<>)
+{
+    $flag++ if /^Archive member included because of file \(symbol\)$/;
+    $flag++ if /^$/;
+    next unless $flag == 2;
+
+    chomp ($line .= $_);
+    if ($line =~ /^(\S+)\s+(\S+)\s+\(([^)]+)\)$/s) {
+	$line = "";
+	my $archive_member = $1;
+	my $because_file = $2;
+	my $because_symbol = $3;
+	$archive_member =~ s|.*/([^/]+)|$1|;
+	$because_file =~ s|.*/([^/]+)|$1|;
+	print "\"$because_file\" -> \"$archive_member\";\n";
+    }
+}
+print "}\n";