Made this test try to enable C++11 via the compiler flag.

dlib/cmake_utils/test_for_cpp11/CMakeLists.txt

-
-cmake_minimum_required(VERSION 2.8.4)
-project(cpp11_test)
-
-add_library(cpp11_test STATIC cpp11_test.cpp )
+
+cmake_minimum_required(VERSION 2.8.4)
+project(cpp11_test)
+
+# Try to enable C++11
+include(CheckCXXCompilerFlag)
+CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
+CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
+if(COMPILER_SUPPORTS_CXX11)
+   message(STATUS "C++11 activated.")
+   ADD_DEFINITIONS("-std=c++11")
+elseif(COMPILER_SUPPORTS_CXX0X)
+   message(STATUS "C++0x activated.")
+   ADD_DEFINITIONS("-std=c++0x")
+endif()
+
+add_library(cpp11_test STATIC cpp11_test.cpp )