Reintroduce duplicate identifier detection in preparser.

tools/gyp/v8.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
@@ skipping 270 matching lines @@
             '../../src/dateparser-inl.h',
             '../../src/debug.cc',
             '../../src/debug.h',
             '../../src/debug-agent.cc',
             '../../src/debug-agent.h',
             '../../src/deoptimizer.cc',
             '../../src/deoptimizer.h',
             '../../src/disasm.h',
             '../../src/disassembler.cc',
             '../../src/disassembler.h',
-            '../../src/dtoa.cc',
-            '../../src/dtoa.h',
             '../../src/diy-fp.cc',
             '../../src/diy-fp.h',
             '../../src/double.h',
+            '../../src/dtoa.cc',
+            '../../src/dtoa.h',
             '../../src/elements.cc',
             '../../src/elements.h',
             '../../src/execution.cc',
             '../../src/execution.h',
             '../../src/factory.cc',
             '../../src/factory.h',
             '../../src/fast-dtoa.cc',
             '../../src/fast-dtoa.h',
             '../../src/flag-definitions.h',
             '../../src/fixed-dtoa.cc',
@@ skipping 330 matching lines @@
             ],
             ['OS=="mac"', {
               'sources': [
                 '../../src/platform-macos.cc',
                 '../../src/platform-posix.cc'
               ]},
             ],
             ['OS=="win"', {
               'sources': [
                 '../../src/platform-win32.cc',
+                '../../src/win32-math.cc',
+                '../../src/win32-math.h',
               ],
               'msvs_disabled_warnings': [4351, 4355, 4800],
               'link_settings':  {
                 'libraries': [ '-lwinmm.lib', '-lws2_32.lib' ],
               },
             }],
             ['component=="shared_library"', {
               'defines': [
                 'BUILDING_V8_SHARED',
                 'V8_SHARED',
@@ skipping 124 matching lines @@
               ]}],
           ],
         },
         {
           'target_name': 'preparser_lib',
           'type': '<(library)',
           'include_dirs+': [
             '../../src',
           ],
           'sources': [
+            '../../include/v8-preparser.h',
+            '../../include/v8stdint.h',
             '../../src/allocation.cc',
+            '../../src/allocation.h',
             '../../src/bignum.cc',
+            '../../src/bignum.h',
+            '../../src/bignum-dtoa.cc',
+            '../../src/bignum-dtoa.h',
             '../../src/cached-powers.cc',
+            '../../src/cached-powers.h',
+            '../../src/char-predicates-inl.h',
+            '../../src/char-predicates.h',
+            '../../src/checks.h',
+            '../../src/conversions-inl.h',
             '../../src/conversions.cc',
+            '../../src/conversions.h',
+            '../../src/diy-fp.cc',
+            '../../src/diy-fp.h',
+            '../../src/double.h',
+            '../../src/dtoa.cc',
+            '../../src/dtoa.h',
+            '../../src/fast-dtoa.cc',
+            '../../src/fast-dtoa.h',
+            '../../src/fixed-dtoa.cc',
+            '../../src/fixed-dtoa.h',
+            '../../src/globals.h',
             '../../src/hashmap.cc',
+            '../../src/hashmap.h',
+            '../../src/list-inl.h',
+            '../../src/list.h',
+            '../../src/preparse-data-format.h',
             '../../src/preparse-data.cc',
+            '../../src/preparse-data.h',
             '../../src/preparser.cc',
+            '../../src/preparser.h',
             '../../src/preparser-api.cc',
             '../../src/scanner-base.cc',
+            '../../src/scanner-base.h',
             '../../src/strtod.cc',
+            '../../src/strtod.h',
             '../../src/token.cc',
+            '../../src/token.h',
+            '../../src/unicode-inl.h',
             '../../src/unicode.cc',
+            '../../src/unicode.h',
+            '../../src/utils-inl.h',
             '../../src/utils.cc',
+            '../../src/utils.h',
+          ],
+          'conditions': [
+            ['OS=="win"', {
+              'sources': [
+                '../../src/win32-math.cc',
+                '../../src/win32-math.h',
+              ]}],
           ],
         },
       ],
     }, { # use_system_v8 != 0
       'targets': [
         {
           'target_name': 'v8',
           'type': 'settings',
           'conditions': [
             ['want_separate_host_toolset==1', {
@@ skipping 19 matching lines @@
             }],
           ],
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }