gyptest-link-restat-importlib.py

#!/usr/bin/env python

# Copyright (c) 2012 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""
Make sure we don't cause unnecessary builds due to import libs appearing
to be out of date.
"""

from __future__ import print_function

import TestGyp

import os
import sys
import time

if sys.platform == 'win32':
  test = TestGyp.TestGyp(formats=['msvs', 'ninja'])

  if not os.environ.get('ProgramFiles(x86)'):
    # TODO(scottmg)
    print('Skipping test on x86, http://crbug.com/365833')
    test.pass_test()

  CHDIR = 'importlib'
  test.run_gyp('importlib.gyp', chdir=CHDIR)
  test.build('importlib.gyp', test.ALL, chdir=CHDIR)

  # Delay briefly so that there's time for this touch not to have the
  # timestamp as the previous run.
  test.sleep()

  # Touch the .cc file; the .dll will rebuild, but the import libs timestamp
  # won't be updated.
  test.touch('importlib/has-exports.cc')
  test.build('importlib.gyp', 'test_importlib', chdir=CHDIR)

  # This is the important part. The .dll above will relink and have an updated
  # timestamp, however the import .libs timestamp won't be updated. So, we
  # have to handle restating inputs in ninja so the final binary doesn't
  # continually relink (due to thinking the .lib isn't up to date).
  test.up_to_date('importlib.gyp', test.ALL, chdir=CHDIR)

  test.pass_test()