win: 'EnableEnhancedInstructionSet': '5' now enables /arch:AVX2.

pylib/gyp/MSVSSettings.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.
 
 r"""Code to validate and convert settings of the Microsoft build tools.
 
 This file contains code to validate and convert settings of the Microsoft
 build tools.  The function ConvertToMSBuildSettings(), ValidateMSVSSettings(),
 and ValidateMSBuildSettings() are the entry points.
 
@@ skipping 601 matching lines @@
       _Enumeration(['',  # Disabled
                     'OldStyle',  # /Z7
                     None,
                     'ProgramDatabase',  # /Zi
                     'EditAndContinue']))  # /ZI
 _Same(_compile, 'EnableEnhancedInstructionSet',
       _Enumeration(['NotSet',
                     'StreamingSIMDExtensions',  # /arch:SSE
                     'StreamingSIMDExtensions2',  # /arch:SSE2
                     'AdvancedVectorExtensions',  # /arch:AVX (vs2012+)
-                    'NoExtensions',]))  # /arch:IA32 (vs2012+)
+                    'NoExtensions',  # /arch:IA32 (vs2012+)
+                    # This one only exists in the new msbuild format.
+                    'AdvancedVectorExtensions2',  # /arch:AVX2 (vs2013r2+)
+                    ]))
 _Same(_compile, 'ErrorReporting',
       _Enumeration(['None',  # /errorReport:none
                     'Prompt',  # /errorReport:prompt
                     'Queue'],  # /errorReport:queue
                    new=['Send']))  # /errorReport:send"
 _Same(_compile, 'ExceptionHandling',
       _Enumeration(['false',
                     'Sync',  # /EHsc
                     'Async'],  # /EHa
                    new=['SyncCThrow']))  # /EHs
@@ skipping 437 matching lines @@
 _MSVSOnly(_manifest, 'UseUnicodeResponseFiles', _boolean)
 
 # MSBuild options not found in MSVS.
 _MSBuildOnly(_manifest, 'EnableDPIAwareness', _boolean)
 _MSBuildOnly(_manifest, 'GenerateCategoryTags', _boolean)  # /category
 _MSBuildOnly(_manifest, 'ManifestFromManagedAssembly',
              _file_name)  # /managedassemblyname
 _MSBuildOnly(_manifest, 'OutputResourceManifests', _string)  # /outputresource
 _MSBuildOnly(_manifest, 'SuppressDependencyElement', _boolean)  # /nodependency
 _MSBuildOnly(_manifest, 'TrackerLogDirectory', _folder_name)