Reviewers: Kevin Millikin,

Description:
Apply Lei Zhang's patch to add easy import of additional environment
variables in our scons setup.

Here is an example of importing an additional environment variable:

export MYVAR='value'
scons importenv="MYVAR"


Please review this at http://codereview.chromium.org/60046

SVN Base: http://v8.googlecode.com/svn/branches/bleeding_edge/

Affected files:
   M     SConstruct


Index: SConstruct
===================================================================
--- SConstruct  (revision 1668)
+++ SConstruct  (working copy)
@@ -508,6 +508,7 @@
    result.Add('mode', 'compilation mode (debug, release)', 'release')
    result.Add('sample', 'build sample (shell, process)', '')
    result.Add('env', 'override environment settings  
(NAME1:value1,NAME2:value2)', '')
+  result.Add('importenv', 'import environment settings (NAME1,NAME2)', '')
    for (name, option) in SIMPLE_OPTIONS.iteritems():
      help = '%s (%s)' % (name, ", ".join(option['values']))
      result.Add(name, help, option.get('default'))
@@ -626,9 +627,13 @@
      options['arch'] = options['simulator']


-def ParseEnvOverrides(arg):
+def ParseEnvOverrides(arg, imports):
    # The environment overrides are in the format NAME1:value1,NAME2:value2
+  # The environment imports are in the format NAME1,NAME2
    overrides = {}
+  for var in imports.split(','):
+    if var in os.environ:
+      overrides[var] = os.environ[var]
    for override in arg.split(','):
      pos = override.find(':')
      if pos == -1:
@@ -726,7 +731,7 @@
    env = Environment(options=opts)
    Help(opts.GenerateHelpText(env))
    VerifyOptions(env)
-  env_overrides = ParseEnvOverrides(env['env'])
+  env_overrides = ParseEnvOverrides(env['env'], env['importenv'])

    SourceSignatures(env['sourcesignatures'])




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