Unbreak building gtest with -std=c++11 on Mac OS X 10.6. Also, better support...

Unbreak building gtest with -std=c++11 on Mac OS X 10.6. Also, better support for death tests in iOS simulator.

include/gtest/internal/gtest-port.h

@@ -93,6 +93,7 @@
 //     GTEST_OS_LINUX_ANDROID - Google Android
 //   GTEST_OS_MAC      - Mac OS X
 //     GTEST_OS_IOS    - iOS
+//       GTEST_OS_IOS_SIMULATOR - iOS simulator
 //   GTEST_OS_NACL     - Google Native Client (NaCl)
 //   GTEST_OS_OPENBSD  - OpenBSD
 //   GTEST_OS_QNX      - QNX
@@ -240,7 +241,7 @@
 # if TARGET_OS_IPHONE
 #  define GTEST_OS_IOS 1
 #  if TARGET_IPHONE_SIMULATOR
-#   define GEST_OS_IOS_SIMULATOR 1
+#   define GTEST_OS_IOS_SIMULATOR 1
 #  endif
 # endif
 #elif defined __linux__
@@ -517,10 +518,10 @@
 #  define GTEST_ENV_HAS_TR1_TUPLE_ 1
 # endif
 
-// C++11 specifies that <tuple> provides std::tuple. Users can't use
-// gtest in C++11 mode until their standard library is at least that
-// compliant.
-# if GTEST_LANG_CXX11
+// C++11 specifies that <tuple> provides std::tuple. Use that if gtest is used
+// in C++11 mode and libstdc++ isn't very old (binaries targeting OS X 10.6
+// can build with clang but need to use gcc4.2's libstdc++).
+# if GTEST_LANG_CXX11 && (!defined(__GLIBCXX__) || __GLIBCXX__ > 20110325)
 #  define GTEST_ENV_HAS_STD_TUPLE_ 1
 # endif
 
@@ -638,7 +639,7 @@ using ::std::tuple_size;
 // abort() in a VC 7.1 application compiled as GUI in debug config
 // pops up a dialog window that cannot be suppressed programmatically.
 #if (GTEST_OS_LINUX || GTEST_OS_CYGWIN || GTEST_OS_SOLARIS || \
-     (GTEST_OS_MAC && (!GTEST_OS_IOS || GEST_OS_IOS_SIMULATOR)) || \
+     (GTEST_OS_MAC && !GTEST_OS_IOS) || GTEST_OS_IOS_SIMULATOR || \
      (GTEST_OS_WINDOWS_DESKTOP && _MSC_VER >= 1400) || \
      GTEST_OS_WINDOWS_MINGW || GTEST_OS_AIX || GTEST_OS_HPUX || \
      GTEST_OS_OPENBSD || GTEST_OS_QNX)