Define DEBUG for v8_optimized_debug=2

src/checks.h

 // Copyright 2012 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 254 matching lines @@
 // actually causes each use to introduce a new defined type with a
 // name depending on the source line.
 template <int> class StaticAssertionHelper { };
 #define STATIC_CHECK(test)                                                    \
   typedef                                                                     \
     StaticAssertionHelper<sizeof(StaticAssertion<static_cast<bool>((test))>)> \
     SEMI_STATIC_JOIN(__StaticAssertTypedef__, __LINE__)
 #endif
 
 
+#ifdef DEBUG
+#ifndef OPTIMIZED_DEBUG
+#define ENABLE_SLOW_ASSERTS    1
+#endif
+#endif
+
+namespace v8 {
+namespace internal {
+#ifdef ENABLE_SLOW_ASSERTS
+#define SLOW_ASSERT(condition) \
+  CHECK(!v8::internal::FLAG_enable_slow_asserts || (condition))
 extern bool FLAG_enable_slow_asserts;
+#else
+#define SLOW_ASSERT(condition) ((void) 0)
+const bool FLAG_enable_slow_asserts = false;
+#endif
+}  // namespace internal
+}  // namespace v8
 
 
 // The ASSERT macro is equivalent to CHECK except that it only
 // generates code in debug builds.
 #ifdef DEBUG
 #define ASSERT_RESULT(expr)    CHECK(expr)
 #define ASSERT(condition)      CHECK(condition)
 #define ASSERT_EQ(v1, v2)      CHECK_EQ(v1, v2)
 #define ASSERT_NE(v1, v2)      CHECK_NE(v1, v2)
 #define ASSERT_GE(v1, v2)      CHECK_GE(v1, v2)
 #define ASSERT_LT(v1, v2)      CHECK_LT(v1, v2)
 #define ASSERT_LE(v1, v2)      CHECK_LE(v1, v2)
-#define SLOW_ASSERT(condition) CHECK(!FLAG_enable_slow_asserts || (condition))
 #else
 #define ASSERT_RESULT(expr)    (expr)
 #define ASSERT(condition)      ((void) 0)
 #define ASSERT_EQ(v1, v2)      ((void) 0)
 #define ASSERT_NE(v1, v2)      ((void) 0)
 #define ASSERT_GE(v1, v2)      ((void) 0)
 #define ASSERT_LT(v1, v2)      ((void) 0)
 #define ASSERT_LE(v1, v2)      ((void) 0)
-#define SLOW_ASSERT(condition) ((void) 0)
 #endif
 // Static asserts has no impact on runtime performance, so they can be
 // safely enabled in release mode. Moreover, the ((void) 0) expression
 // obeys different syntax rules than typedef's, e.g. it can't appear
 // inside class declaration, this leads to inconsistency between debug
 // and release compilation modes behavior.
 #define STATIC_ASSERT(test)  STATIC_CHECK(test)
 
 #define ASSERT_NOT_NULL(p)  ASSERT_NE(NULL, p)
 
 // "Extra checks" are lightweight checks that are enabled in some release
 // builds.
 #ifdef ENABLE_EXTRA_CHECKS
 #define EXTRA_CHECK(condition) CHECK(condition)
 #else
 #define EXTRA_CHECK(condition) ((void) 0)
 #endif
 
 #endif  // V8_CHECKS_H_