Gem::Ext::RakeBuilder.build

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/ext/rake_builder.rb, line 10
def self.build(extension, dest_path, results, args = [], lib_dir = nil, extension_dir = Dir.pwd,
  target_rbconfig = Gem.target_rbconfig, n_jobs: nil)
  if target_rbconfig.path
    warn "--target-rbconfig is not yet supported for Rake extensions. Ignoring"
  end

  if /mkrf_conf/i.match?(File.basename(extension))
    # Gem.ruby is quoted if it contains whitespace, so split it into argv
    # elements to keep the quotes out of the spawned command.
    run([*shellsplit(Gem.ruby), File.basename(extension), *args], results, class_name, extension_dir)
  end

  rake = ENV["rake"]

  if rake
    rake = shellsplit_command(rake)
  else
    begin
      rake = ruby << "-rrubygems" << Gem.bin_path("rake", "rake")
    rescue Gem::Exception
      rake = [Gem.default_exec_format % "rake"]
    end
  end

  rake_args = ["RUBYARCHDIR=#{dest_path}", "RUBYLIBDIR=#{dest_path}", *args]
  run(rake + rake_args, results, class_name, extension_dir)

  results
end