Move V8EXPORT definition to its own file

include/v8-preparser.h

Index: include/v8-preparser.h
diff --git a/include/v8-preparser.h b/include/v8-preparser.h
index 3e39823d65ccdd8d78cd189581bdd6e2e5c7f4a0..5676b533e39c9d519e894e6292096482a747a278 100644
--- a/include/v8-preparser.h
+++ b/include/v8-preparser.h
@@ -28,43 +28,9 @@
 #ifndef PREPARSER_H
 #define PREPARSER_H
 
+#include "v8-export.h"
 #include "v8stdint.h"
 
-#ifdef _WIN32
-
-// Setup for Windows DLL export/import. When building the V8 DLL the
-// BUILDING_V8_SHARED needs to be defined. When building a program which uses
-// the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8
-// static library or building a program which uses the V8 static library neither
-// BUILDING_V8_SHARED nor USING_V8_SHARED should be defined.
-#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED)
-#error both BUILDING_V8_SHARED and USING_V8_SHARED are set - please check the\
-  build configuration to ensure that at most one of these is set
-#endif
-
-#ifdef BUILDING_V8_SHARED
-#define V8EXPORT __declspec(dllexport)
-#elif USING_V8_SHARED
-#define V8EXPORT __declspec(dllimport)
-#else
-#define V8EXPORT
-#endif  // BUILDING_V8_SHARED
-
-#else  // _WIN32
-
-// Setup for Linux shared library export. There is no need to distinguish
-// between building or using the V8 shared library, but we should not
-// export symbols when we are building a static library.
-#if defined(__GNUC__) && ((__GNUC__ >= 4) || \
-    (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) && defined(V8_SHARED)
-#define V8EXPORT __attribute__ ((visibility("default")))
-#else
-#define V8EXPORT
-#endif
-
-#endif  // _WIN32
-
-
 namespace v8 {
 
 // The result of preparsing is either a stack overflow error, or an opaque
@@ -115,6 +81,4 @@ PreParserData V8EXPORT Preparse(UnicodeInputStream* input,
 
 }  // namespace v8.
 
-#undef V8EXPORT
-
 #endif  // PREPARSER_H