Add a Rakefile for generating a bridgesupport file whenever the project is built in XCode. This is for RubyMotion when building out a third-party library.

Rakefile

DIR = File.dirname(__FILE__)

BRIDGESUPPORT_FILE = "BridgeSupport.bridgesupport"

namespace :gen do
  desc "Generates the bridgesupport file for RubyMotion"
  task :bridgesupport do
    Dir.chdir(DIR) do
      SHELL_COMMAND=<<-EOS.gsub(/^\s*/, '')
        #!/bin/sh
        BRIDGESUPPORT_INCLUDES=`find . -type d | ruby -e "puts '-I' + STDIN.read.split(/\n/).join(' -I')"`
        BRIDGESUPPORT_FILES=`find . -name "*.h" | ruby -e "puts STDIN.read.split(/\n/).join(' ')"`

        echo gen_bridge_metadata -F complete --no-64-bit -c \\\"$BRIDGESUPPORT_INCLUDES\\\" $BRIDGESUPPORT_FILES -o #{BRIDGESUPPORT_FILE}
      EOS
      command = `#{SHELL_COMMAND}`
      system command
    end
  end
end

RubyMotion.rakefile

# Inside of Motion::Project::App.setup do/end blocks add

app.bridgesupport_files << File.dirname(File.dirname(__FILE__)) + "/YOUR_TARGET_NAME/BridgeSupport.bridgesupport"

RubyScriptInXCode.sh

cd $SRCROOT && cd $TARGET_NAME && rake gen:bridgesupport