old_contents: # swift_build_support/debug.py - Print information on the build -*- python -*-
  #
  # This source file is part of the Swift.org open source project
  #
  # Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
  # Licensed under Apache License v2.0 with Runtime Library Exception
  #
  # See http://swift.org/LICENSE.txt for license information
  # See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
  #
  # ----------------------------------------------------------------------------
  #
  # Convenient functions for printing out information on the build process.
  #
  # ----------------------------------------------------------------------------
  
  from __future__ import absolute_import
  from __future__ import print_function
  
  import sys
  
  from . import shell
  
  
  def print_xcodebuild_versions(file=sys.stdout):
      """
      Print the host machine's `xcodebuild` version, as well as version
      information for all available SDKs.
      """
      version = shell.capture(
          ['xcodebuild', '-version'],
          dry_run=False, echo=False, optional=True).rstrip()
      sdks = shell.capture(
          ['xcodebuild', '-version', '-sdk'],
          dry_run=False, echo=False, optional=True).rstrip()
      fmt = """\
  {version}
  
  --- SDK versions ---
  {sdks}
  
  """
      print(fmt.format(version=version, sdks=sdks), file=file)
      file.flush()
  
new_contents: # swift_build_support/debug.py - Print information on the build -*- python -*-
  #
  # This source file is part of the Swift.org open source project
  #
  # Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
  # Licensed under Apache License v2.0 with Runtime Library Exception
  #
  # See http://swift.org/LICENSE.txt for license information
  # See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
  #
  # ----------------------------------------------------------------------------
  #
  # Convenient functions for printing out information on the build process.
  #
  # ----------------------------------------------------------------------------
  
  from __future__ import absolute_import
  from __future__ import print_function
  
  import sys
  
  from . import shell
  
  
  def print_xcodebuild_versions(file=sys.stdout):
      """
      Print the host machine's `xcodebuild` version, as well as version
      information for all available SDKs.
      """
      version = shell.capture(
          ['xcodebuild', '-version'], dry_run=False, echo=False).rstrip()
      sdks = shell.capture(
          ['xcodebuild', '-version', '-sdk'], dry_run=False, echo=False).rstrip()
      fmt = """\
  {version}
  
  --- SDK versions ---
  {sdks}
  
  """
      print(fmt.format(version=version, sdks=sdks), file=file)
      file.flush()
  
subject: Make --show-sdks fail if calling `xcodebuild` failed