Simple tool that scans an iOS library and checks the size of the bitcode segment for each included object file. It logs a warning for files with no bitcode or whose bitcode is less than 1Kbyte; or with the -v flag it logs the sizes of all bitcode segments.

bitcodesize.rb

#! /usr/bin/env ruby
# By Jens Alfke. Do What Thou Wilt shall be the whole of the license.


def listBitcode(path, arch, verbose =false)
  result = []
  filename = nil
  section = nil

  output = `otool -l -arch #{arch} "#{path}"`
  output.each_line do |line|
    if line =~ /\((.+)\):$/ then
      result << "#{filename}(#{arch}):\t**NONE**"  if filename != nil
      filename = $1
      #puts $1+":"
    elsif line =~ /sectname (\w+)/
      section = $1
      #puts "\t\tsectname #{$1}"
    elsif line =~ /size 0x(\w+)/
      #puts "\t\tsize #{$1}"
      if section == "__bitcode"
        size = $1.to_i(16)
        warning = (size < 1024) ? " **TINY?**" : ""
        result << "#{filename}(#{arch}):\t#{size}#{warning}"  if verbose || warning!=""
        filename = nil
      end
    end
  end
  result << "#{filename}(#{arch}): **NONE**"  if filename != nil
  return result
end

verbose = false
path = ARGV[0]
if !path then
  puts "usage: bitcodesize [-v] objectfilename.a"
  puts "  Finds object files missing bitcode in a static library."
  exit(1)
elsif path == "-v" then
  verbose = true
  path = ARGV[1]
end

puts (listBitcode(path, "arm64", verbose) + listBitcode(path, "armv7", verbose)).sort!