Reintroduce duplicate identifier detection in preparser.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index bb9d0a8e8bb5578ddb0b6819b7bfc939f538c00e..6c6966aee53194b1c85b8a9a2d7822a16b235860 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -28,6 +28,35 @@
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
+// Define V8_INFINITY
+#define V8_INFINITY INFINITY
+
+// GCC specific stuff
+#ifdef __GNUC__
+
+#define __GNUC_VERSION_FOR_INFTY__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
+
+// Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
+// warning flag and certain versions of GCC due to a bug:
+// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
+// For now, we use the more involved template-based version from <limits>, but
+// only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
+// __GNUC_PREREQ is not defined in GCC for Mac OS X, so we define our own macro
+#if __GNUC_VERSION_FOR_INFTY__ >= 29600 && __GNUC_VERSION_FOR_INFTY__ < 40100

[Rico, 2011/09/07 11:51:31]

Chromium requires GCC 4.2 can't we remove this and do the same?

[Lasse Reichstein, 2011/09/07 11:59:14]

We probably could, but I'd say that's an executive decision :)

+#include <limits>
+#undef V8_INFINITY
+#define V8_INFINITY std::numeric_limits<double>::infinity()
+#endif
+#undef __GNUC_VERSION_FOR_INFTY__
+
+#endif  // __GNUC__
+
+#ifdef _MSC_VER
+#undef V8_INFINITY
+#define V8_INFINITY HUGE_VAL
+#endif
+
+
 #include "../include/v8stdint.h"
 
 namespace v8 {