Fix cross compilation of snapshot builds using scons....

src/SConscript

 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 288 matching lines @@
 
   # Build dtoa.
   dtoa_env = env.Copy()
   dtoa_env.Replace(**context.flags['dtoa'])
   dtoa_files = ['dtoa-config.c']
   dtoa_obj = context.ConfigureObject(dtoa_env, dtoa_files)
 
   source_objs = context.ConfigureObject(env, source_files)
   non_snapshot_files = [dtoa_obj, source_objs]
 
-  # Create snapshot if necessary.
+  # Create snapshot if necessary.  For cross compilation you should either
+  # do without snapshots and take the performance hit or you should build a
+  # host VM with the simulator=arm and snapshot=on options and then take the
+  # resulting snapshot.cc file from obj/release and put it in the src
+  # directory.  Then rebuild the VM with the cross compiler and specify
+  # snapshot=nobuild on the scons command line.
   empty_snapshot_obj = context.ConfigureObject(env, 'snapshot-empty.cc')
   mksnapshot_env = env.Copy()
   mksnapshot_env.Replace(**context.flags['mksnapshot'])
   mksnapshot_src = 'mksnapshot.cc'
   mksnapshot = mksnapshot_env.Program('mksnapshot', [mksnapshot_src, libraries_obj, non_snapshot_files, empty_snapshot_obj], PDB='mksnapshot.exe.pdb')
   if context.use_snapshot:
     if context.build_snapshot:
       snapshot_cc = env.Snapshot('snapshot.cc', mksnapshot, LOGFILE=File('snapshot.log').abspath)
     else:
-      snapshot_cc = Command('snapshot.cc', [], [])
+      snapshot_cc = 'snapshot.cc'
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot])
 
 
 (library_objs, d8_objs, mksnapshot) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot')