Fix gyp->make translation of rules with several outputs.

pylib/gyp/generator/make.py

 # Copyright (c) 2013 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.
 
 # Notes:
 #
 # This is all roughly based on the Makefile system used by the Linux
 # kernel, but is a non-recursive make -- we put the entire dependency
 # graph in front of make and let it figure it out.
 #
@@ skipping 1723 matching lines @@
     elif len(outputs) == 1:
       # Regular rule, one output: Just write a simple rule.
       self.WriteLn('%s: %s%s' % (outputs[0], ' '.join(inputs), force_append))
     else:
       # Regular rule, more than one output: Multiple outputs are tricky in
       # make. We will write three rules:
       # - All outputs depend on an intermediate file.
       # - Make .INTERMEDIATE depend on the intermediate.
       # - The intermediate file depends on the inputs and executes the
       #   actual command.
-      #
-      # For an explanation of the problem and several solutions that don't
-      # work, see this:
-      # http://www.gnu.org/software/hello/manual/automake/Multiple-Outputs.html
+      # - The intermediate recipe will 'touch' the intermediate file.
+      # - The multi-output rule will have an do-nothing recipe.
       intermediate = "%s.intermediate" % (command if command else self.target)
       self.WriteLn('%s: %s' % (' '.join(outputs), intermediate))
+      self.WriteLn('\t%s' % '@:');
       self.WriteLn('%s: %s' % ('.INTERMEDIATE', intermediate))
       self.WriteLn('%s: %s%s' %
                    (intermediate, ' '.join(inputs), force_append))
+      actions.insert(0, '$(call do_cmd,touch)')
 
     if actions:
       for action in actions:
         self.WriteLn('\t%s' % action)
     self.WriteLn()
 
 
   def WriteAndroidNdkModuleRule(self, module_name, all_sources, link_deps):
     """Write a set of LOCAL_XXX definitions for Android NDK.
 
@@ skipping 437 matching lines @@
     root_makefile.write("endif\n")
   root_makefile.write('\n')
 
   if (not generator_flags.get('standalone')
       and generator_flags.get('auto_regeneration', True)):
     WriteAutoRegenerationRule(params, root_makefile, makefile_name, build_files)
 
   root_makefile.write(SHARED_FOOTER)
 
   root_makefile.close()