libsize.py
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	from __future__ import print_function, division
	import os
	import sys

	# Internal build script for generating debugging test .so size.
	# Usage:
	# python libsize.py file.so save.txt -- displays the size of file.so and, if save.txt exists, compares it to the
	# size in it, then overwrites save.txt with the new size for future runs.

	if len(sys.argv) != 3:
	sys.exit("Invalid arguments: usage: python libsize.py file.so save.txt")

	lib = sys.argv[1]
	save = sys.argv[2]

	if not os.path.exists(lib):
	sys.exit("Error: requested file ({}) does not exist".format(lib))

	libsize = os.path.getsize(lib)

	print("------", os.path.basename(lib), "file size:", libsize, end='')

	if os.path.exists(save):
	with open(save) as sf:
	oldsize = int(sf.readline())

	if oldsize > 0:
	change = libsize - oldsize
	if change == 0:
	print(" (no change)")
	else:
	print(" (change of {:+} bytes = {:+.2%})".format(change, change / oldsize))
	else:
	print()

	with open(save, 'w') as sf:
	sf.write(str(libsize))