[344] Don't compile in async dns support by default for makefiles.

config.mk

@@ -76,6 +76,9 @@ WITH_DOCS:=yes
 # Build with client support for SOCK5 proxy.
 WITH_SOCKS:=yes
 
+# Build with async dns lookup support for bridges (temporary). Requires glibc.
+#WITH_ADNS:=yes
+
 # =============================================================================
 # End of user configuration
 # =============================================================================
@@ -239,6 +242,11 @@ ifeq ($(WITH_EC),yes)
 	BROKER_CFLAGS:=$(BROKER_CFLAGS) -DWITH_EC
 endif
 
+ifeq ($(WITH_ADNS),yes)
+	BROKER_LIBS:=$(BROKER_LIBS) -lanl
+	BROKER_CFLAGS:=$(BROKER_CFLAGS) -DWITH_ADNS
+endif
+
 MAKE_ALL:=mosquitto
 ifeq ($(WITH_DOCS),yes)
 	MAKE_ALL:=$(MAKE_ALL) docs

lib/mosquitto_internal.h

@@ -155,7 +155,7 @@ struct mosquitto {
 #ifndef WITH_BROKER
 	mosq_sock_t sockpairR, sockpairW;
 #endif
-#ifdef __GLIBC__
+#if defined(__GLIBC__) && defined(WITH_ADNS)
 	struct gaicb *adns; /* For getaddrinfo_a */
 #endif
 	enum _mosquitto_protocol protocol;

lib/net_mosq.c

@@ -271,7 +271,7 @@ static unsigned int psk_client_callback(SSL *ssl, const char *hint,
 }
 #endif
 
-#if defined(WITH_BROKER) && defined(__GLIBC__)
+#if defined(WITH_BROKER) && defined(__GLIBC__) && defined(WITH_ADNS)
 /* Async connect, part 1 (dns lookup) */
 int _mosquitto_try_connect_step1(struct mosquitto *mosq, const char *host)
 {

src/bridge.c

@@ -131,7 +131,7 @@ int mqtt3_bridge_new(struct mosquitto_db *db, struct _mqtt3_bridge *bridge)
 		return MOSQ_ERR_NOMEM;
 	}
 
-#ifdef __GLIBC__
+#if defined(__GLIBC__) && defined(WITH_ADNS)
 	new_context->bridge->restart_t = 1; /* force quick restart of bridge */
 	return mqtt3_bridge_connect_step1(db, new_context);
 #else

src/loop.c

@@ -247,7 +247,7 @@ int mosquitto_main_loop(struct mosquitto_db *db, mosq_sock_t *listensock, int li
 					if((context->bridge->start_type == bst_lazy && context->bridge->lazy_reconnect)
 							|| (context->bridge->start_type == bst_automatic && now > context->bridge->restart_t)){
 
-#ifdef __GLIBC__
+#if defined(__GLIBC__) && defined(WITH_ADNS)
 						if(context->adns){
 							/* Waiting on DNS lookup */
 							rc = gai_error(context->adns);