disable warnings on some compilers for unused asprintf() return values

avahi.c

@@ -25,19 +25,23 @@ int avahi_start(char const *service_name,char const *service_type,int const serv
 #endif
     // run "avahi-publish-service --no-fail --host=dns_name service_name service_type service_port description pid hostname" in subprocess
     // No need to free the asprintf-allocated strings, we're calling exec anyway
-    char *port_string;
+    // Turn off warnings about unused return values from asprintf generated by some compilers
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result" 
+    char *port_string = NULL;
     asprintf(&port_string, "%d", service_port);
 
-    char *host_string;
+    char *host_string = NULL;
     asprintf(&host_string, "--host=%s",dns_name);
 
-    char *pid_string;
+    char *pid_string = NULL;
     asprintf(&pid_string, "pid=%d", pid);
 
     char hostname[sysconf(_SC_HOST_NAME_MAX)];
     gethostname(hostname,sizeof(hostname));
-    char *source_string;
+    char *source_string = NULL;
     asprintf(&source_string, "source=%s", hostname);
+#pragma GCC diagnostic pop
 
 #if 0
     fprintf(stdout,"%s %s %s %s %s %s %s %s %s %s\n",
@@ -49,8 +53,11 @@ int avahi_start(char const *service_name,char const *service_type,int const serv
   }
   if(fork() == 0){
     // run "avahi-publish-address dns_name address"
-    char *ip_address_string;    // No need to free, we're calling exec
+    char *ip_address_string = NULL;    // No need to free, we're calling exec
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result" 
     asprintf(&ip_address_string,"%d.%d.%d.%d",(address >> 24) & 0xff, (address >> 16) & 0xff, (address >> 8) & 0xff, address & 0xff);
+#pragma GCC diagnostic pop
 #if 0
     fprintf(stdout,"avahi start: ip address string = %s\n",ip_address_string);
     fprintf(stdout,"avahi-publish-address child pid %d\n",getpid());