Do not use common INFINITY name as it might be overriden by some other includ...

src/conversions.cc

 // Copyright 2006-2008 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 309 matching lines @@
     if (result != 0.0 || end != cstr) {
       // It appears that strtod worked
       index += end - cstr;
     } else {
       // Check for {+,-,}Infinity
       bool is_negative = (GetChar(str, index) == '-');
       if (GetChar(str, index) == '+' || GetChar(str, index) == '-')
         index++;
       if (!SubStringEquals(str, index, "Infinity"))
         return JUNK_STRING_VALUE;
-      result = is_negative ? -INFINITY : INFINITY;
+      result = is_negative ? -V8_INFINITY : V8_INFINITY;
       index += 8;
     }
   }
 
   if ((flags & ALLOW_TRAILING_JUNK) == 0) {
     // skip trailing spaces
     while ((index < len) && IsSpace(str, index)) index++;
     // string ending with junk?
     if (index < len) return JUNK_STRING_VALUE;
   }
@@ skipping 358 matching lines @@
   // Allocate result and fill in the parts.
   StringBuilder builder(result_size + 1);
   builder.AddSubstring(integer_buffer + integer_pos + 1, integer_part_size);
   if (decimal_pos > 0) builder.AddCharacter('.');
   builder.AddSubstring(decimal_buffer, decimal_pos);
   return builder.Finalize();
 }
 
 
 } }  // namespace v8::internal