Problem: non-portable memset

Solution: add dummy pointer meber to union instead

src/address.cpp

@@ -51,7 +51,7 @@ zmq::address_t::address_t (const std::string &protocol_,
     address (address_),
     parent (parent_)
 {
-    memset (&resolved, 0, sizeof resolved);
+    resolved.dummy = NULL;
 }
 
 zmq::address_t::~address_t ()

src/address.hpp

@@ -76,8 +76,10 @@ struct address_t
     ctx_t *const parent;
 
     //  Protocol specific resolved address
+    //  All members must be pointers to allow for consistent initialization
     union
     {
+        void *dummy;
         tcp_address_t *tcp_addr;
         udp_address_t *udp_addr;
 #if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS                     \