https://git.tuxfamily.org/chrony/chrony.git/commit/?id=7b97668319f9449b4adb1a978bb1fe9b0fb22e4d
https://bugs.gentoo.org/880519

From 7b97668319f9449b4adb1a978bb1fe9b0fb22e4d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Holger=20Hoffst=C3=A4tte?= <holger@applied-asynchrony.com>
Date: Wed, 9 Nov 2022 09:17:14 +0100
Subject: getdate: fix various warnings which will be errors with clang-16
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These were found by Gentoo's QA while rebuilding the world with
clang-16: https://bugs.gentoo.org/880519

Signed-off-by: Holger Hoffstätte <holger@applied-asynchrony.com>

--- a/getdate.y
+++ b/getdate.y
@@ -448,9 +448,9 @@ o_merid	: /* NULL */
    the same signature as the function definition does. */
 #include "getdate.h"
 
-extern struct tm	*gmtime ();
-extern struct tm	*localtime ();
-extern time_t		mktime ();
+extern struct tm	*gmtime (const time_t *timep);
+extern struct tm	*localtime (const time_t *timep);
+extern time_t		mktime (struct tm *tm);
 
 /* Month and day table. */
 static TABLE const MonthDayTable[] = {
@@ -641,16 +641,13 @@ static TABLE const MilitaryTable[] = {
 
 /* ARGSUSED */
 static int
-yyerror (s)
-     char *s ATTRIBUTE_UNUSED;
+yyerror (char *s ATTRIBUTE_UNUSED)
 {
   return 0;
 }
 
 static int
-ToHour (Hours, Meridian)
-     int Hours;
-     MERIDIAN Meridian;
+ToHour (int Hours, MERIDIAN Meridian)
 {
   switch (Meridian)
     {
@@ -677,8 +674,7 @@ ToHour (Hours, Meridian)
 }
 
 static int
-ToYear (Year)
-     int Year;
+ToYear (int Year)
 {
   if (Year < 0)
     Year = -Year;
@@ -694,8 +690,7 @@ ToYear (Year)
 }
 
 static int
-LookupWord (buff)
-     char *buff;
+LookupWord (char *buff)
 {
   register char *p;
   register char *q;
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