Fix unused-but-set-variable error when built on 12.x

Add `timeout` argument to serverReadReply()

src/MacVim/MMBackend.h

@@ -143,7 +143,7 @@
               silent:(BOOL)silent;
 - (NSArray *)serverList;
 - (NSString *)peekForReplyOnPort:(int)port;
-- (NSString *)waitForReplyOnPort:(int)port;
+- (NSString *)waitForReplyOnPort:(int)port timeout:(NSTimeInterval)timeout;
 - (BOOL)sendReply:(NSString *)reply toPort:(int)port;
 
 - (BOOL)waitForAck;

src/MacVim/MMBackend.m

@@ -1582,7 +1582,7 @@ extern GuiFont gui_mch_retain_font(GuiFont font);
     return nil;
 }
 
-- (NSString *)waitForReplyOnPort:(int)port
+- (NSString *)waitForReplyOnPort:(int)port timeout:(NSTimeInterval)timeout
 {
     ASLogDebug(@"port=%d", port);
     
@@ -1593,13 +1593,16 @@ extern GuiFont gui_mch_retain_font(GuiFont font);
     NSNumber *key = [NSNumber numberWithInt:port];
     NSMutableArray *replies = nil;
     NSString *reply = nil;
+    NSDate *limitDate = timeout > 0
+        ? [NSDate dateWithTimeIntervalSinceNow:timeout] : [NSDate distantFuture];
 
     // Wait for reply as long as the connection to the server is valid (unless
     // user interrupts wait with Ctrl-C).
     while (!got_int && [conn isValid] &&
-            !(replies = [serverReplyDict objectForKey:key])) {
+            !(replies = [serverReplyDict objectForKey:key]) &&
+            (timeout <= 0 || [limitDate timeIntervalSinceNow] > 0)) {
         [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
-                                 beforeDate:[NSDate distantFuture]];
+                                 beforeDate:limitDate];
     }
 
     if (replies) {

src/MacVim/gui_macvim.m

@@ -2118,9 +2118,10 @@ serverPeekReply(int port, char_u **str)
  * Return -1 on error.
  */
     int
-serverReadReply(int port, char_u **str)
+serverReadReply(int port, char_u **str, int timeout)
 {
-    NSString *reply = [[MMBackend sharedInstance] waitForReplyOnPort:port];
+    NSString *reply = [[MMBackend sharedInstance] waitForReplyOnPort:port
+							     timeout:timeout];
     if (reply && str) {
         *str = [reply vimStringSave];
         return 0;

src/clientserver.c

@@ -457,7 +457,7 @@ cmdsrv_main(
 		    if (p == NULL)
 			break;
 # elif defined(MAC_CLIENTSERVER)
-                    if (serverReadReply(srv, &p) < 0)
+                    if (serverReadReply(srv, &p, 0) < 0)
                         break;
 # else
 		    if (serverReadReply(xterm_dpy, srv, &p, TRUE, -1) < 0)
@@ -934,7 +934,7 @@ f_remote_read(typval_T *argvars UNUSED, typval_T *rettv)
 	    r = serverGetReply((HWND)n, FALSE, TRUE, TRUE, timeout);
 	if (r == NULL)
 # elif defined(MAC_CLIENTSERVER)
-        if (serverReadReply(serverStrToPort(serverid), &r) < 0)
+        if (serverReadReply(serverStrToPort(serverid), &r, timeout) < 0)
 # else
 	if (check_connection() == FAIL
 		|| serverReadReply(X_DISPLAY, serverStrToWin(serverid),

src/proto/gui_macvim.pro

@@ -91,7 +91,7 @@ int serverSendToVim(char_u *name, char_u *cmd, char_u **result, int *server, int
 char_u *serverGetVimNames(void);
 int serverStrToPort(char_u *str);
 int serverPeekReply(int port, char_u **str);
-int serverReadReply(int port, char_u **str);
+int serverReadReply(int port, char_u **str, int timeout);
 int serverSendReply(char_u *serverid, char_u *str);
 
 void gui_mch_enter_fullscreen(guicolor_T bg);