generate_bin

# File lib/bundler/source/path.rb, line 211
      def generate_bin(spec, options = {})
        gem_dir = Pathname.new(spec.full_gem_path)

        # Some gem authors put absolute paths in their gemspec
        # and we have to save them from themselves
        spec.files = spec.files.map do |p|
          next p unless p =~ /\A#{Pathname::SEPARATOR_PAT}/
          next if File.directory?(p)
          begin
            Pathname.new(p).relative_path_from(gem_dir).to_s
          rescue ArgumentError
            p
          end
        end.compact

        installer = Path::Installer.new(
          spec,
          :env_shebang => false,
          :disable_extensions => options[:disable_extensions],
          :build_args => options[:build_args],
          :bundler_extension_cache_path => extension_cache_path(spec)
        )
        installer.post_install
      rescue Gem::InvalidSpecificationException => e
        Bundler.ui.warn "\n#{spec.name} at #{spec.full_gem_path} did not have a valid gemspec.\n"                          "This prevents bundler from installing bins or native extensions, but "                          "that may not affect its functionality."

        if !spec.extensions.empty? && !spec.email.empty?
          Bundler.ui.warn "If you need to use this package without installing it from a gem "                            "repository, please contact #{spec.email} and ask them "                            "to modify their .gemspec so it can work with `gem build`."
        end

        Bundler.ui.warn "The validation message from RubyGems was:\n  #{e.message}"
      end