configure: add checks for used c++11 features

configure.in

@@ -50,10 +50,40 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]])],
 	AC_MSG_RESULT([yes])
 		std_cpp0x="-std=c++0x",
 	AC_MSG_RESULT([no])
-		AC_MSG_ERROR([[Your compiler doesn't seem to support C++0x, please upgrade (GCC >= 4.4)]])
+		AC_MSG_ERROR([[Your compiler doesn't seem to support C++0x, please upgrade (GCC >= 4.5)]])
 )
 CXXFLAGS="$old_CXXFLAGS $std_cpp0x"
 
+dnl ==========================================
+dnl = checking for initializer lists support =
+dnl ==========================================
+AC_MSG_CHECKING([whether compiler supports initializer lists])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <vector>], [[std::vector<int> test = { 1, 2, 3 }; test.push_back(4);]])],
+	AC_MSG_RESULT([yes]),
+	AC_MSG_RESULT([no])
+		AC_MSG_ERROR([[Your compiler doesn't seem to support initializer lists, please upgrade (GCC >= 4.5)]])
+)
+
+dnl =====================================
+dnl = checking for auto keyword support =
+dnl =====================================
+AC_MSG_CHECKING([whether compiler supports auto keyword])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[auto test = new int; *test = 1;]])],
+	AC_MSG_RESULT([yes]),
+	AC_MSG_RESULT([no])
+		AC_MSG_ERROR([[Your compiler doesn't seem to support auto keyword, please upgrade (GCC >= 4.5)]])
+)
+
+dnl =========================================
+dnl = checking for lambda functions support =
+dnl =========================================
+AC_MSG_CHECKING([whether compiler supports lambda functions])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <functional>], [[int a = 5; std::function<int(int)> f = [&a](int b) { return a + b; }; f(8);]])],
+	AC_MSG_RESULT([yes]),
+	AC_MSG_RESULT([no])
+		AC_MSG_ERROR([[Your compiler doesn't seem to support lambda functions, please upgrade (GCC >= 4.5)]])
+)
+
 dnl ==============================
 dnl = checking for regex (win32) =
 dnl ==============================