Provide a way to suppress implicit MIDL generation rules for actions

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 742 matching lines @@
     return int(rule.get('msvs_cygwin_shell',
                         self.spec.get('msvs_cygwin_shell', 1))) != 0
 
   def _HasExplicitRuleForExtension(self, spec, extension):
     """Determine if there's an explicit rule for a particular extension."""
     for rule in spec.get('rules', []):
       if rule['extension'] == extension:
         return True
     return False
 
-  def HasExplicitIdlRules(self, spec):
-    """Determine if there's an explicit rule for idl files. When there isn't we
-    need to generate implicit rules to build MIDL .idl files."""
-    return self._HasExplicitRuleForExtension(spec, 'idl')
+  def _HasExplicitIdlActions(self, spec):
+    """Determine if an action should not run midl for .idl files."""
+    return any([action.get('explicit_idl_action', 0)
+                for action in spec.get('actions', [])])
+
+  def HasExplicitIdlRulesOrActions(self, spec):
+    """Determine if there's an explicit rule or action for idl files. When
+    there isn't we need to generate implicit rules to build MIDL .idl files."""
+    return (self._HasExplicitRuleForExtension(spec, 'idl') or
+            self._HasExplicitIdlActions(spec))
 
   def HasExplicitAsmRules(self, spec):
     """Determine if there's an explicit rule for asm files. When there isn't we
     need to generate implicit rules to assemble .asm files."""
     return self._HasExplicitRuleForExtension(spec, 'asm')
 
   def GetIdlBuildData(self, source, config):
     """Determine the implicit outputs for an idl file. Returns output
     directory, outputs, and variables and flags that are required."""
     config = self._TargetConfig(config)
@@ skipping 233 matching lines @@
 
   # To determine processor word size on Windows, in addition to checking
   # PROCESSOR_ARCHITECTURE (which reflects the word size of the current
   # process), it is also necessary to check PROCESSOR_ARCHITEW6432 (which
   # contains the actual word size of the system when running thru WOW64).
   if ('64' in os.environ.get('PROCESSOR_ARCHITECTURE', '') or
       '64' in os.environ.get('PROCESSOR_ARCHITEW6432', '')):
     default_variables['MSVS_OS_BITS'] = 64
   else:
     default_variables['MSVS_OS_BITS'] = 32