staticlibchecker.rb

#!/usr/bin/env ruby

require 'optparse'
require 'pathname'
require 'open3'

# This tool checks an input path for all static libraries *.a files 
# and makes sure they were built with the most modern ObjC ABI version.

# Parse command line options.
options = {}
OptionParser.new do |opts|
	opts.banner = 'Usage: staticlibchecker.rb [options]'
	opts.on('-i', '--input-path FOLDER', 'Input path') { |v| options[:input_path] = v }
end.parse!

input_path = ""
if options[:input_path].nil?
	raise "No input path specified"
else 
	input_path = options[:input_path]
end

all_static_libs = Dir["#{input_path}/**/*.a"]
puts all_static_libs
category_class_var_flag = 1<<6
all_static_libs.each { |path|

	# Run otool against the static lib
	command = "otool -ov #{path}"
	stdout, stderr, status = Open3.capture3(command)
	if !status.success?
		puts "Failed with output: #{stderr}"
		exit status.exitstatus
	end

	# extract 'flags' value
	match = stdout.match /^\s+flags\s+(0x[\d]+)$/
	if match 
		flags = Integer(match[1])
		if flags & category_class_var_flag == 0
			puts "File: #{File.basename(path)} was built with an old ABI version!"
		end
	end
}