add #define to manage dynamic exception deprecation in c++11/14

IlmBase/Iex/IexBaseExc.h

@@ -50,6 +50,25 @@
 #include <exception>
 #include <sstream>
 
+//----------------------------------------------------------
+//
+//	C++11 deprecates the specification of dynamic exception throw and
+//	then changes this again in C++17. for convenience, put a macro
+//	here to enable existing places to specify the exception list, and
+//	have it done so appropriately based on the language features
+//	active.
+//
+//----------------------------------------------------------
+#ifdef ILMBASE_FORCE_CXX03
+#   define IEX_THROW_SPEC(...) throw (__VA_ARGS__)
+#else
+#   if __cplusplus <= 201402L
+#      define IEX_THROW_SPEC(...)
+#   else
+#      define IEX_THROW_SPEC(...) throw (__VA_ARGS__)
+#   endif
+#endif
+
 IEX_INTERNAL_NAMESPACE_HEADER_ENTER