Add a macro BOOST_DISABLE_EXPLICIT_SYMBOL_VISIBILITY to disable mandatory symbol visibility

include/boost/config/detail/suffix.hpp

@@ -47,6 +47,22 @@
 # define BOOST_SYMBOL_VISIBLE
 #endif
 
+//
+// disable explicitly enforced visibility
+//
+#if defined(BOOST_DISABLE_EXPLICIT_SYMBOL_VISIBILITY)
+
+#undef BOOST_SYMBOL_EXPORT
+#define BOOST_SYMBOL_EXPORT
+
+#undef BOOST_SYMBOL_IMPORT
+#define BOOST_SYMBOL_IMPORT
+
+#undef BOOST_SYMBOL_VISIBLE
+#define BOOST_SYMBOL_VISIBLE
+
+#endif
+
 //
 // look for long long by looking for the appropriate macros in <limits.h>.
 // Note that we use limits.h rather than climits for maximal portability,