Added full C++11 check and allowed gcc 4.7 as partial

apps/srt-tunnel.cpp

@@ -41,6 +41,7 @@
 #include <udt.h> // This TEMPORARILY contains extra C++-only SRT API.
 #include <logging.h>
 #include <api.h>
+#include <utilities.h>
 
 /*
 # MAF contents for this file. Note that not every file from the support
@@ -382,10 +383,10 @@ class SrtMedium: public Medium
     friend class Medium;
 public:
 
-#ifndef _MSC_VER
+#ifdef HAVE_FULL_CXX11
     using Medium::Medium;
 
-#else // MSVC not exactly supports C++11
+#else // MSVC and gcc 4.7 not exactly support C++11
 
     SrtMedium(UriParser u, size_t ch): Medium(u, ch) {}
 

srtcore/utilities.h

@@ -27,10 +27,21 @@ written by
 
 #if defined(__cplusplus) && __cplusplus > 199711L
 #define HAVE_CXX11 1
+#define HAVE_FULL_CXX11 1
 #define ATR_NOEXCEPT noexcept
 #define ATR_CONSTEXPR constexpr
 #define ATR_OVERRIDE override
 #define ATR_FINAL final
+
+// For gcc 4.7, claim C++11 is supported, as long as experimental C++0x is on,
+// however it's only the "most required C++11 support".
+#elif defined(__GNUC__) && defined(__GXX_EXPERIMENTAL_CXX0X__) && __GNUC_MINOR__ >= 7 // 4.7 only!
+#define HAVE_CXX11 1
+#define ATR_NOEXCEPT
+#define ATR_CONSTEXPR
+#define ATR_OVERRIDE
+#define ATR_FINAL
+
 // Microsoft Visual Studio supports C++11, but not fully,
 // and still did not change the value of __cplusplus. Treat
 // this special way.