Makes gtest compile cleanly with MSVC's /W4 (by Zhanyong Wan).

Renames EventListenrs to TestEventListeners (by Zhanyong Wan).
Fixes invalid characters in XML report (by Vlad Losev).
Refacotrs SConscript (by Vlad Losev).

include/gtest/internal/gtest-death-test-internal.h

@@ -153,7 +153,7 @@ bool ExitedUnsuccessfully(int exit_status);
 // ASSERT_EXIT*, and EXPECT_EXIT*.
 #define GTEST_DEATH_TEST_(statement, predicate, regex, fail) \
   GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
-  if (true) { \
+  if (::testing::internal::AlwaysTrue()) { \
     const ::testing::internal::RE& gtest_regex = (regex); \
     ::testing::internal::DeathTest* gtest_dt; \
     if (!::testing::internal::DeathTest::Create(#statement, &gtest_regex, \
@@ -259,7 +259,7 @@ InternalRunDeathTestFlag* ParseInternalRunDeathTestFlag();
       GTEST_LOG_(WARNING) \
           << "Death tests are not supported on this platform.\n" \
           << "Statement '" #statement "' cannot be verified."; \
-    } else if (!::testing::internal::AlwaysTrue()) { \
+    } else if (::testing::internal::AlwaysFalse()) { \
       ::testing::internal::RE::PartialMatch(".*", (regex)); \
       GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_(statement); \
       terminator; \

include/gtest/internal/gtest-internal.h

@@ -745,9 +745,15 @@ class TypeParameterizedTestCase<Fixture, Templates0, Types> {
 // the trace but Bar() and GetCurrentOsStackTraceExceptTop() won't.
 String GetCurrentOsStackTraceExceptTop(UnitTest* unit_test, int skip_count);
 
-// A helper for suppressing warnings on unreachable code in some macros.
+// Helpers for suppressing warnings on unreachable code or constant
+// condition.
+
+// Always returns true.
 bool AlwaysTrue();
 
+// Always returns false.
+inline bool AlwaysFalse() { return !AlwaysTrue(); }
+
 // A simple Linear Congruential Generator for generating random
 // numbers with a uniform distribution.  Unlike rand() and srand(), it
 // doesn't use global state (and therefore can't interfere with user
@@ -854,7 +860,7 @@ class Random {
 
 #define GTEST_TEST_BOOLEAN_(boolexpr, booltext, actual, expected, fail) \
   GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
-  if (boolexpr) \
+  if (::testing::internal::IsTrue(boolexpr)) \
     ; \
   else \
     fail("Value of: " booltext "\n  Actual: " #actual "\nExpected: " #expected)

include/gtest/internal/gtest-port.h

@@ -577,6 +577,10 @@ typedef ::std::stringstream StrStream;
 typedef ::std::strstream StrStream;
 #endif  // GTEST_HAS_STD_STRING
 
+// A helper for suppressing warnings on constant condition.  It just
+// returns 'condition'.
+bool IsTrue(bool condition);
+
 // Defines scoped_ptr.
 
 // This implementation of scoped_ptr is PARTIAL - it only contains
@@ -599,7 +603,7 @@ class scoped_ptr {
 
   void reset(T* p = NULL) {
     if (p != ptr_) {
-      if (sizeof(T) > 0) {  // Makes sure T is a complete type.
+      if (IsTrue(sizeof(T) > 0)) {  // Makes sure T is a complete type.
         delete ptr_;
       }
       ptr_ = p;
@@ -1037,7 +1041,7 @@ typedef TypeWithSize<8>::Int TimeInMillis;  // Represents time in milliseconds.
 //    whether it is built in the debug mode or not.
 #define GTEST_CHECK_(condition) \
     GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
-    if (condition) \
+    if (::testing::internal::IsTrue(condition)) \
       ; \
     else \
       GTEST_LOG_(FATAL) << "Condition " #condition " failed. "