Pass the /safeseh option to ml.exe.

pylib/gyp/msvs_emulation.py

Index: pylib/gyp/msvs_emulation.py
diff --git a/pylib/gyp/msvs_emulation.py b/pylib/gyp/msvs_emulation.py
index 6b5dfc2180f474a48723437e3b57a448e6104eab..63593a424d8a792fca896b025cd8e674c438c439 100644
--- a/pylib/gyp/msvs_emulation.py
+++ b/pylib/gyp/msvs_emulation.py
@@ -345,6 +345,15 @@ class MsvsSettings(object):
     else:
       return None
 
+  def GetAsmflags(self, config):
+    """Returns the flags that need to be added to ml invocations."""
+    config = self._TargetConfig(config)
+    asmflags = []
+    safeseh = self._Setting(('MASM', 'UseSafeExceptionHandlers'), config)
+    if safeseh == 'true':
+      asmflags.append('/safeseh')
+    return asmflags
+
   def GetCflags(self, config):
     """Returns the flags that need to be added to .c and .cc compilations."""
     config = self._TargetConfig(config)
@@ -528,6 +537,7 @@ class MsvsSettings(object):
     ld('Profile', map={'true': '/PROFILE'})
     ld('LargeAddressAware',
         map={'1': ':NO', '2': ''}, prefix='/LARGEADDRESSAWARE')
+    ld('ImageHasSafeExceptionHandlers', map={'true': '/SAFESEH'})
     # TODO(scottmg): This should sort of be somewhere else (not really a flag).
     ld('AdditionalDependencies', prefix='')