Distinguish between C++11 language and library support for std::function,...

Distinguish between C++11 language and library support for std::function, std::begin, std::end, and std::move in gtest and gmock.

include/gtest/internal/gtest-port.h

@@ -377,12 +377,34 @@
 # endif
 #endif
 
-// C++11 specifies that <initializer_list> provides std::initializer_list. 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)
+// Distinct from C++11 language support, some environments don't provide
+// proper C++11 library support. Notably, it's possible to build in
+// C++11 mode when targeting Mac OS X 10.6, which has an old libstdc++
+// with no C++11 support.
+//
+// libstdc++ has sufficient C++11 support as of GCC 4.6.0, __GLIBCXX__
+// 20110325, but maintenance releases in the 4.4 and 4.5 series followed
+// this date, so check for those versions by their date stamps.
+// https://gcc.gnu.org/onlinedocs/libstdc++/manual/abi.html#abi.versioning
+#if GTEST_LANG_CXX11 && \
+    (!defined(__GLIBCXX__) || ( \
+        __GLIBCXX__ >= 20110325ul &&  /* GCC >= 4.6.0 */ \
+        /* Blacklist of patch releases of older branches: */ \
+        __GLIBCXX__ != 20110416ul &&  /* GCC 4.4.6 */ \
+        __GLIBCXX__ != 20120313ul &&  /* GCC 4.4.7 */ \
+        __GLIBCXX__ != 20110428ul &&  /* GCC 4.5.3 */ \
+        __GLIBCXX__ != 20120702ul))   /* GCC 4.5.4 */
+# define GTEST_STDLIB_CXX11 1
+#endif
+
+// Only use C++11 library features if the library provides them.
+#if GTEST_STDLIB_CXX11
+# define GTEST_HAS_STD_BEGIN_AND_END_ 1
+# define GTEST_HAS_STD_FORWARD_LIST_ 1
+# define GTEST_HAS_STD_FUNCTION_ 1
 # define GTEST_HAS_STD_INITIALIZER_LIST_ 1
+# define GTEST_HAS_STD_MOVE_ 1
+# define GTEST_HAS_STD_UNIQUE_PTR_ 1
 #endif
 
 // C++11 specifies that <tuple> provides std::tuple.
@@ -883,7 +905,7 @@ using ::std::tuple_size;
 # define GTEST_MUST_USE_RESULT_
 #endif  // __GNUC__ && (GTEST_GCC_VER_ >= 30400) && !COMPILER_ICC
 
-#if GTEST_LANG_CXX11
+#if GTEST_HAS_STD_MOVE_
 # define GTEST_MOVE_(x) ::std::move(x)  // NOLINT
 #else
 # define GTEST_MOVE_(x) x

test/gtest-printers_test.cc

@@ -1037,7 +1037,7 @@ TEST(PrintTr1TupleTest, NestedTuple) {
 
 #endif  // GTEST_HAS_TR1_TUPLE
 
-#if GTEST_LANG_CXX11
+#if GTEST_HAS_STD_TUPLE_
 // Tests printing ::std::tuples.
 
 // Tuples of various arities.