Merge branch 'develop' into message-prefix

include/boost/config/compiler/codegear.hpp

@@ -112,6 +112,7 @@
 #define BOOST_NO_CXX11_RAW_LITERALS
 #define BOOST_NO_CXX11_RVALUE_REFERENCES
 #define BOOST_NO_SFINAE_EXPR
+#define BOOST_NO_CXX11_SFINAE_EXPR
 #define BOOST_NO_CXX11_TEMPLATE_ALIASES
 #define BOOST_NO_CXX11_UNICODE_LITERALS
 #define BOOST_NO_CXX11_VARIADIC_TEMPLATES
@@ -153,6 +154,23 @@
 #  define BOOST_NO_CXX14_VARIABLE_TEMPLATES
 #endif
 
+// C++17
+#if !defined(__cpp_structured_bindings) || (__cpp_structured_bindings < 201606)
+#  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
+#endif
+
+#if !defined(__cpp_inline_variables) || (__cpp_inline_variables < 201606)
+#  define BOOST_NO_CXX17_INLINE_VARIABLES
+#endif
+
+#if !defined(__cpp_fold_expressions) || (__cpp_fold_expressions < 201603)
+#  define BOOST_NO_CXX17_FOLD_EXPRESSIONS
+#endif
+
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
+
 //
 // TR1 macros:
 //