- [fixed] Fixed build warnings introduced with Xcode 12.5 (#7433)

Author: paulb777

FirebaseMessaging/CHANGELOG.md

@@ -1,3 +1,6 @@
+# 2021-02 -- v7.6.0
+- [fixed] Fixed build warnings introduced with Xcode 12.5. (#7433)
+
 # 2020-11 -- v7.1.0
 - [fixed] Fixed completion handler issue in `application(_:didReceiveRemoteNotification:fetchCompletionHandler:)` method. (#6863)
 

FirebaseMessaging/Sources/FIRMessagingTopicOperation.m

@@ -26,7 +26,7 @@
 static NSString *const kFIRMessagingSubscribeServerHost =
     @"https://iid.googleapis.com/iid/register";
 
-NSString *FIRMessagingSubscriptionsServer() {
+NSString *FIRMessagingSubscriptionsServer(void) {
   static NSString *serverHost = nil;
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{