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diff --git a/Tools/scripts/objgraph.py b/Tools/scripts/objgraph.py
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+++ b/Tools/scripts/objgraph.py
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+#!/usr/local/python
+
+# objgraph
+#
+# Read "nm -o" input (on IRIX: "nm -Bo") of a set of libraries or modules
+# and print various interesting listings, such as:
+#
+# - which names are used but not defined in the set (and used where),
+# - which names are defined in the set (and where),
+# - which modules use which other modules,
+# - which modules are used by which other modules.
+#
+# Usage: objgraph [-cdu] [file] ...
+# -c: print callers per objectfile
+# -d: print callees per objectfile
+# -u: print usage of undefined symbols
+# If none of -cdu is specified, all are assumed.
+# Use "nm -o" to generate the input (on IRIX: "nm -Bo"),
+# e.g.: nm -o /lib/libc.a | objgraph
+
+
+import sys
+import string
+import path
+import getopt
+import regexp
+
+# Types of symbols.
+#
+definitions = 'TRGDSBAEC'
+externals = 'UV'
+ignore = 'Nntrgdsbavuc'
+
+# Regular expression to parse "nm -o" output.
+#
+matcher = regexp.compile('(.*):\t?........ (.) (.*)$')
+
+# Store "item" in "dict" under "key".
+# The dictionary maps keys to lists of items.
+# If there is no list for the key yet, it is created.
+#
+def store(dict, key, item):
+	if dict.has_key(key):
+		dict[key].append(item)
+	else:
+		dict[key] = [item]
+
+# Return a flattened version of a list of strings: the concatenation
+# of its elements with intervening spaces.
+#
+def flat(list):
+	s = ''
+	for item in list:
+		s = s + ' ' + item
+	return s[1:]
+
+# Global variables mapping defined/undefined names to files and back.
+#
+file2undef = {}
+def2file = {}
+file2def = {}
+undef2file = {}
+
+# Read one input file and merge the data into the tables.
+# Argument is an open file.
+#
+def readinput(file):
+	while 1:
+		s = file.readline(200) # Arbitrary, but reasonable limit
+		if not s:
+			break
+		# If you get an exception on this line,
+		# it is probably caused by an unexpected input line:
+		(ra, rb), (r1a, r1b), (r2a, r2b), (r3a, r3b) = matcher.exec(s)
+		fn, name, type = s[r1a:r1b], s[r3a:r3b], s[r2a:r2b]
+		if type in definitions:
+			store(def2file, name, fn)
+			store(file2def, fn, name)
+		elif type in externals:
+			store(file2undef, fn, name)
+			store(undef2file, name, fn)
+		elif not type in ignore:
+			print fn + ':' + name + ': unknown type ' + type
+
+# Print all names that were undefined in some module and where they are
+# defined.
+#
+def printcallee():
+	flist = file2undef.keys()
+	flist.sort()
+	for file in flist:
+		print file + ':'
+		elist = file2undef[file]
+		elist.sort()
+		for ext in elist:
+			if len(ext) >= 8:
+				tabs = '\t'
+			else:
+				tabs = '\t\t'
+			if not def2file.has_key(ext):
+				print '\t' + ext + tabs + ' *undefined'
+			else:
+				print '\t' + ext + tabs + flat(def2file[ext])
+
+# Print for each module the names of the other modules that use it.
+#
+def printcaller():
+	files = file2def.keys()
+	files.sort()
+	for file in files:
+		callers = []
+		for label in file2def[file]:
+			if undef2file.has_key(label):
+				callers = callers + undef2file[label]
+		if callers:
+			callers.sort()
+			print file + ':'
+			lastfn = ''
+			for fn in callers:
+				if fn <> lastfn:
+					print '\t' + fn
+				lastfn = fn
+		else:
+			print file + ': unused'
+
+# Print undefine names and where they are used.
+#
+def printundef():
+	undefs = {}
+	for file in file2undef.keys():
+		for ext in file2undef[file]:
+			if not def2file.has_key(ext):
+				store(undefs, ext, file)
+	elist = undefs.keys()
+	elist.sort()
+	for ext in elist:
+		print ext + ':'
+		flist = undefs[ext]
+		flist.sort()
+		for file in flist:
+			print '\t' + file
+
+# Print warning messages about names defined in more than one file.
+#
+def warndups():
+	savestdout = sys.stdout
+	sys.stdout = sys.stderr
+	names = def2file.keys()
+	names.sort()
+	for name in names:
+		if len(def2file[name]) > 1:
+			print 'warning:', name, 'multiply defined:',
+			print flat(def2file[name])
+	sys.stdout = savestdout
+
+# Main program
+#
+def main():
+	try:
+		optlist, args = getopt.getopt(sys.argv[1:], 'cdu')
+	except getopt.error:
+		sys.stdout = sys.stderr
+		print 'Usage:', path.basename(sys.argv[0]), '[-cdu] [file] ...'
+		print '-c: print callers per objectfile'
+		print '-d: print callees per objectfile'
+		print '-u: print usage of undefined symbols'
+		print 'If none of -cdu is specified, all are assumed.'
+		print 'Use "nm -o" to generate the input (on IRIX: "nm -Bo"),'
+		print 'e.g.: nm -o /lib/libc.a | objgraph'
+		return 1
+	optu = optc = optd = 0
+	for opt, void in optlist:
+		if opt = '-u':
+			optu = 1
+		elif opt = '-c':
+			optc = 1
+		elif opt = '-d':
+			optd = 1
+	if optu = optc = optd = 0:
+		optu = optc = optd = 1
+	if not args:
+		args = ['-']
+	for file in args:
+		if file = '-':
+			readinput(sys.stdin)
+		else:
+			readinput(open(file, 'r'))
+	#
+	warndups()
+	#
+	more = (optu + optc + optd > 1)
+	if optd:
+		if more:
+			print '---------------All callees------------------'
+		printcallee()
+	if optu:
+		if more:
+			print '---------------Undefined callees------------'
+		printundef()
+	if optc:
+		if more:
+			print '---------------All Callers------------------'
+		printcaller()
+	return 0
+
+# Call the main program.
+# Use its return value as exit status.
+# Catch interrupts to avoid stack trace.
+#
+try:
+	sys.exit(main())
+except KeyboardInterrupt:
+	sys.exit(1)