ninja/win: Set /O2 compiler flag by default if no 'Optimization' specified

pylib/gyp/msvs_emulation.py

 # 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.
 
 """
 This module helps emulate Visual Studio 2008 behavior on top of other
 build systems, primarily ninja.
 """
 
 import os
@@ skipping 316 matching lines @@
     return output_file
 
   def GetCflags(self, config):
     """Returns the flags that need to be added to .c and .cc compilations."""
     config = self._TargetConfig(config)
     cflags = []
     cflags.extend(['/wd' + w for w in self.msvs_disabled_warnings[config]])
     cl = self._GetWrapper(self, self.msvs_settings[config],
                           'VCCLCompilerTool', append=cflags)
     cl('Optimization',
-       map={'0': 'd', '1': '1', '2': '2', '3': 'x'}, prefix='/O')
+       map={'0': 'd', '1': '1', '2': '2', '3': 'x'}, prefix='/O', default='2')
     cl('InlineFunctionExpansion', prefix='/Ob')
     cl('StringPooling', map={'true': '/GF'})
     cl('EnableFiberSafeOptimizations', map={'true': '/GT'})
     cl('OmitFramePointers', map={'false': '-', 'true': ''}, prefix='/Oy')
     cl('EnableIntrinsicFunctions', map={'false': '-', 'true': ''}, prefix='/Oi')
     cl('FavorSizeOrSpeed', map={'1': 't', '2': 's'}, prefix='/O')
     cl('WholeProgramOptimization', map={'true': '/GL'})
     cl('WarningLevel', prefix='/W')
     cl('WarnAsError', map={'true': '/WX'})
     cl('DebugInformationFormat',
@@ skipping 489 matching lines @@
   so they're not surprised when the VS build fails."""
   if int(generator_flags.get('msvs_error_on_missing_sources', 0)):
     no_specials = filter(lambda x: '$' not in x, sources)
     relative = [os.path.join(build_dir, gyp_to_ninja(s)) for s in no_specials]
     missing = filter(lambda x: not os.path.exists(x), relative)
     if missing:
       # They'll look like out\Release\..\..\stuff\things.cc, so normalize the
       # path for a slightly less crazy looking output.
       cleaned_up = [os.path.normpath(x) for x in missing]
       raise Exception('Missing input files:\n%s' % '\n'.join(cleaned_up))