Make sure GYP supports compiling managed code.

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 690 matching lines @@
 _ConvertedToAdditionalOption(_compile, 'DefaultCharIsUnsigned', '/J')
 
 # MSVS options not found in MSBuild.
 _MSVSOnly(_compile, 'Detect64BitPortabilityProblems', _boolean)
 _MSVSOnly(_compile, 'UseUnicodeResponseFiles', _boolean)
 
 # MSBuild options not found in MSVS.
 _MSBuildOnly(_compile, 'BuildingInIDE', _boolean)
 _MSBuildOnly(_compile, 'CompileAsManaged',
              _Enumeration([], new=['false',
-                                   'true',  # /clr
-                                   'Pure',  # /clr:pure
-                                   'Safe',  # /clr:safe
-                                   'OldSyntax']))  # /clr:oldSyntax
+                                   'true']))  # /clr
 _MSBuildOnly(_compile, 'CreateHotpatchableImage', _boolean)  # /hotpatch
 _MSBuildOnly(_compile, 'MultiProcessorCompilation', _boolean)  # /MP
 _MSBuildOnly(_compile, 'PreprocessOutputPath', _string)  # /Fi
 _MSBuildOnly(_compile, 'ProcessorNumber', _integer)  # the number of processors
 _MSBuildOnly(_compile, 'TrackerLogDirectory', _folder_name)
 _MSBuildOnly(_compile, 'TreatSpecificWarningsAsErrors', _string_list)  # /we
 _MSBuildOnly(_compile, 'UseUnicodeForAssemblerListing', _boolean)  # /FAu
 
 # Defines a setting that needs very customized processing
 _CustomGeneratePreprocessedFile(_compile, 'GeneratePreprocessedFile')
@@ skipping 365 matching lines @@
 _MSBuildOnly(_manifest, 'SuppressDependencyElement', _boolean)  # /nodependency
 _MSBuildOnly(_manifest, 'TrackerLogDirectory', _folder_name)
 
 
 # Directives for MASM.
 # See "$(VCTargetsPath)\BuildCustomizations\masm.xml" for the schema of the
 # MSBuild MASM settings.
 
 # Options that have the same name in MSVS and MSBuild.
 _Same(_masm, 'UseSafeExceptionHandlers', _boolean)  # /safeseh