ninja mac: Smarter dylib linking.

test/ninja/solibs_avoid_relinking/gyptest-solibs-avoid-relinking.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.
 
 """
 Verify that relinking a solib doesn't relink a dependent executable if the
 solib's public API hasn't changed.
 """
 
 import os
 import sys
 import TestGyp
 
 # NOTE(fischman): This test will not work with other generators because the
 # API-hash-based-mtime-preservation optimization is only implemented in
 # ninja.py.  It could be extended to the make.py generator as well pretty
 # easily, probably.
 # (also, it tests ninja-specific out paths, which would have to be generalized
 # if this was extended to other generators).
 test = TestGyp.TestGyp(formats=['ninja'])
 
-# The optimization being tested for is only implemented on linux.
-if sys.platform in ['win32', 'cygwin', 'darwin']:
+# The optimization being tested for is only implemented on linux and mac.
+# XXX does win do this implicitly? ask scott

[Ami GONE FROM CHROMIUM, 2012/06/30 22:37:04]

I'm pretty sure the test failed on a gyp win bot before I added this, FWIW.

+if sys.platform in ['win32', 'cygwin']:
   test.pass_test()
   sys.exit(0)
 
 test.run_gyp('solibs_avoid_relinking.gyp')
 
 # Build the executable, grab its timestamp, touch the solib's source, rebuild
 # executable, ensure timestamp hasn't changed.
 test.build('solibs_avoid_relinking.gyp', 'b')
 test.built_file_must_exist('b')
 pre_stat = os.stat(test.built_file_path('b'))
 os.utime(os.path.join(test.workdir, 'solib.cc'),
          (pre_stat.st_atime, pre_stat.st_mtime + 100))
 test.sleep()
 test.build('solibs_avoid_relinking.gyp', 'b')
 post_stat = os.stat(test.built_file_path('b'))
 
 if pre_stat.st_mtime != post_stat.st_mtime:
   test.fail_test()
 else:
   test.pass_test()