Refactor .gyp files:

samples/samples.gyp

 # Copyright 2011 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
 #       with the distribution.
 #     * Neither the name of Google Inc. nor the names of its
 #       contributors may be used to endorse or promote products derived
 #       from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
+  'includes': ['../build/common.gypi'],
   'target_defaults': {
     'type': 'executable',
     'dependencies': [
       '../tools/gyp/v8.gyp:v8',
     ],
     'include_dirs': [
       '../include',
     ],
+    'conditions': [
+      ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"', {
+        'ldflags': [
+          '-pthread',
+        ]},
+      ],

[Yang, 2011/08/25 11:24:03]

Can this be moved into common.gypi? For example under target_defaults. As far as
I can see this is because v8::internal::Thread is implemented with pthread on
Linux/Mac, and is part of v8 itself, not limited to d8 or the samples or
cctests.

[Jakob Kummerow, 2011/08/25 14:46:08]

Done.

+    ],
   },
   'targets': [
     {
       'target_name': 'shell',
       'sources': [
         'shell.cc',
       ],
     },
     {
       'target_name': 'process',
       'sources': [
         'process.cc',
       ],
     }
   ],
 }