Enabling /ZW (CompileAsWinRT) option for msvs

pylib/gyp/generator/msvs.py

Index: pylib/gyp/generator/msvs.py
diff --git a/pylib/gyp/generator/msvs.py b/pylib/gyp/generator/msvs.py
index bc4dfc31247b735f853eed881c858913169a328e..e60c0256312118fc0c3420a2ef4aec5dadd9adb9 100644
--- a/pylib/gyp/generator/msvs.py
+++ b/pylib/gyp/generator/msvs.py
@@ -257,6 +257,8 @@ def _ToolSetOrAppend(tools, tool_name, setting, value, only_if_unset=False):
   if not tools.get(tool_name):
     tools[tool_name] = dict()
   tool = tools[tool_name]
+  if 'CompileAsWinRT' == setting:
+    return
   if tool.get(setting):
     if only_if_unset: return
     if type(tool[setting]) == list and type(value) == list:
@@ -286,6 +288,21 @@ def _ConfigFullName(config_name, config_data):
   return '%s|%s' % (_ConfigBaseName(config_name, platform_name), platform_name)
 
 
+def _ConfigWindowsTargetPlatformVersion(config_data):
+  ver = config_data.get('msvs_windows_sdk_version')
+
+  for key in [r'HKLM\Software\Microsoft\Microsoft SDKs\Windows\%s',
+              r'HKLM\Software\Wow6432Node\Microsoft\Microsoft SDKs\Windows\%s']:
+    sdk_dir = MSVSVersion._RegistryGetValue(key % ver, 'InstallationFolder')
+    if not sdk_dir:
+      continue
+    version = MSVSVersion._RegistryGetValue(key % ver, 'ProductVersion') or ''
+    # Find a matching entry in sdk_dir\include.
+    names = sorted([x for x in os.listdir(r'%s\include' % sdk_dir)
+                    if x.startswith(version)], reverse=True)
+    return names[0]
+
+
 def _BuildCommandLineForRuleRaw(spec, cmd, cygwin_shell, has_input_path,
                                 quote_cmd, do_setup_env):
 
@@ -2676,6 +2693,21 @@ def _GetMSBuildGlobalProperties(spec, guid, gyp_file_name):
     else:
       properties[0].append(['ApplicationType', 'Windows Store'])
 
+  platform_name = None
+  msvs_windows_sdk_version = None
+  for configuration in spec['configurations'].itervalues():
+    platform_name = platform_name or _ConfigPlatform(configuration)
+    msvs_windows_sdk_version = (msvs_windows_sdk_version or
+                    _ConfigWindowsTargetPlatformVersion(configuration))
+    if platform_name and msvs_windows_sdk_version:
+      break
+
+  if platform_name == 'ARM':
+    properties[0].append(['WindowsSDKDesktopARMSupport', 'true'])
+  if msvs_windows_sdk_version:
+    properties[0].append(['WindowsTargetPlatformVersion',
+                          str(msvs_windows_sdk_version)])
+
   return properties
 
 def _GetMSBuildConfigurationDetails(spec, build_file):