msvs: ensure that failing actions make the build fail with multiple actions

pylib/gyp/generator/msvs.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.
 
 import copy
 import ntpath
 import os
 import posixpath
 import re
 import subprocess
@@ skipping 3269 matching lines @@
       if action.get('msbuild_use_call', True):
         cmd = 'call ' + cmd
       commands.append(cmd)
     # Add the custom build action for one input file.
     description = ', and also '.join(descriptions)
 
     # We can't join the commands simply with && because the command line will
     # get too long. See also _AddActions: cygwin's setup_env mustn't be called
     # for every invocation or the command that sets the PATH will grow too
     # long.
-    command = (
-        '\r\nif %errorlevel% neq 0 exit /b %errorlevel%\r\n'.join(commands))
+    command = '\r\n'.join([c + '\r\nif %errorlevel% neq 0 exit /b %errorlevel%'
+                           for c in commands])
     _AddMSBuildAction(spec,
                       primary_input,
                       inputs,
                       outputs,
                       command,
                       description,
                       sources_handled_by_action,
                       actions_spec)
   return actions_spec, sources_handled_by_action
 
@@ skipping 12 matching lines @@
   action_spec.extend(
       # TODO(jeanluc) 'Document' for all or just if as_sources?
       [['FileType', 'Document'],
        ['Command', command],
        ['Message', description],
        ['Outputs', outputs]
       ])
   if additional_inputs:
     action_spec.append(['AdditionalInputs', additional_inputs])
   actions_spec.append(action_spec)