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 #!/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.

 """

 Verifies build of an executable with C++ define specified by a gyp define, and

 the use of the environment during regeneration when the gyp file changes.

 """

 import os

 import TestGyp

 env_stack = []

 def PushEnv():

   env_copy = os.environ.copy()

   env_stack.append(env_copy)

 def PopEnv():

   os.eniron=env_stack.pop()

 # Regenerating build files when a gyp file changes is currently only supported

 # by the make and Android generators.

 test = TestGyp.TestGyp(formats=['make', 'android'])

 try:

   PushEnv()

   os.environ['CXXFLAGS'] = '-O0'

   test.run_gyp('cxxflags.gyp')

 finally:

   # We clear the environ after calling gyp.  When the auto-regeneration happens,

   # the same define should be reused anyway.  Reset to empty string first in

   # case the platform doesn't support unsetenv.

   PopEnv()

 test.build('cxxflags.gyp')

 expect = """\

 Using no optimization flag

 """

 test.run_built_executable('cxxflags', stdout=expect)

 test.sleep()

 try:

   PushEnv()

   os.environ['CXXFLAGS'] = '-O2'

   test.run_gyp('cxxflags.gyp')

 finally:

   # We clear the environ after calling gyp.  When the auto-regeneration happens,

   # the same define should be reused anyway.  Reset to empty string first in

   # case the platform doesn't support unsetenv.

   PopEnv()

 test.build('cxxflags.gyp')

 expect = """\

 Using an optimization flag

 """

 test.run_built_executable('cxxflags', stdout=expect)

 test.pass_test()