Add support for starting a detached process

tools/gyp/configurations_make.gypi

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
-    'dart_debug_optimization_level%': '2',
+    'dart_debug_optimization_level%': '0',

[kustermann, 2015/01/16 16:11:04]

What is this?

[Søren Gjesse, 2015/01/21 12:32:35]

Setting -O0 for debug builds. Only for debugging. Reverted.

   },
   'target_defaults': {
     'configurations': {
       'Dart_Linux_Base': {
         'abstract': 1,
         'cflags': [
           '-Werror',
           '<@(common_gcc_warning_flags)',
           '-Wnon-virtual-dtor',
           '-Wvla',
@@ skipping 150 matching lines @@
             ],
           }],
         ],
         'cflags': [
           '-O3',
         ],
       },
     },
   },
 }