Make gyp work with Cygwin

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
===================================================================
--- tools/gyp/v8.gyp	(revision 14269)
+++ tools/gyp/v8.gyp	(working copy)
@@ -750,14 +750,22 @@
             ],
             ['OS=="win"', {
               'variables': {
+                'build_env': '<!(uname -o)',

[Jakob Kummerow, 2013/04/16 08:27:24]

This causes an error when running "python build\gyp_v8" in a plain Windows
(non-Cygwin, non-MinGW) command prompt.

                 'gyp_generators': '<!(echo $GYP_GENERATORS)',
               },
-              'sources': [
-                '../../src/platform-win32.cc',
-                '../../src/win32-math.cc',
-                '../../src/win32-math.h',
-              ],
               'conditions': [
+                ['build_env=="Cygwin"', {
+                  'sources': [
+                    '../../src/platform-cygwin.cc',
+                    '../../src/platform-posix.cc',
+                  ],
+                }, {
+                  'sources': [
+                    '../../src/platform-win32.cc',
+                    '../../src/win32-math.h',
+                    '../../src/win32-math.cc',
+                  ],
+                }],
                 ['gyp_generators=="make"', {
                   'link_settings':  {
                     'libraries': [ '-lwinmm', '-lws2_32' ],