Support profiler stack sampling in any situation.

SConstruct

 # 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 556 matching lines @@
     'cctest': cctest_flags,
     'sample': sample_flags,
     'd8': d8_flags
   }
 
   target_id = mode
   suffix = SUFFIXES[target_id]
   library_name = 'v8' + suffix
   env['LIBRARY'] = library_name
 
-  # Build the object files by invoking SCons recursively.  
+  # Build the object files by invoking SCons recursively.
   (object_files, shell_files, mksnapshot) = env.SConscript(
     join('src', 'SConscript'),
     build_dir=join('obj', target_id),
     exports='context',
     duplicate=False
   )
 
   context.mksnapshot_targets.append(mksnapshot)
 
   # Link the object files into a library.
   env.Replace(**context.flags['v8'])
   context.ApplyEnvOverrides(env)
   if context.options['library'] == 'static':
     library = env.StaticLibrary(library_name, object_files)
   else:
     # There seems to be a glitch in the way scons decides where to put
     # PDB files when compiling using MSVC so we specify it manually.
     # This should not affect any other platforms.
     pdb_name = library_name + '.dll.pdb'
     library = env.SharedLibrary(library_name, object_files, PDB=pdb_name)
   context.library_targets.append(library)
-  
+
   d8_env = Environment()
   d8_env.Replace(**context.flags['d8'])
   shell = d8_env.Program('d8' + suffix, object_files + shell_files)
   context.d8_targets.append(shell)
 
   for sample in context.samples:
     sample_env = Environment(LIBRARY=library_name)
     sample_env.Replace(**context.flags['sample'])
     context.ApplyEnvOverrides(sample_env)
     sample_object = sample_env.SConscript(
       join('samples', 'SConscript'),
       build_dir=join('obj', 'sample', sample, target_id),
       exports='sample context',
       duplicate=False
     )
     sample_name = sample + suffix
     sample_program = sample_env.Program(sample_name, sample_object)
     sample_env.Depends(sample_program, library)
     context.sample_targets.append(sample_program)
-  
+
   cctest_program = env.SConscript(
     join('test', 'cctest', 'SConscript'),
     build_dir=join('obj', 'test', target_id),
     exports='context object_files',
     duplicate=False
   )
   context.cctest_targets.append(cctest_program)
-  
+
   return context
 
 
 def Build():
   opts = GetOptions()
   env = Environment(options=opts)
   Help(opts.GenerateHelpText(env))
   VerifyOptions(env)
   env_overrides = ParseEnvOverrides(env['env'])
 
@@ skipping 30 matching lines @@
 # version of scons.  Also, there's a bug in some revisions that
 # doesn't allow this flag to be set, so we swallow any exceptions.
 # Lovely.
 try:
   SetOption('warn', 'no-deprecated')
 except:
   pass
 
 
 Build()