* libmisc/obscure.c: Tag the `old' parameter of palindrome(),

similar(), and simple() as unused.
* libmisc/loginprompt.c: Tag the `sig' parameter of login_exit()
  as unused.
* src/expiry.c: Tag the `sig' parameter of catch_signals() as
  unused.
* src/su.c: Tag the `sig' parameter of catch_signals() as unused.
* src/su.c: Add int parameter to the prototype of oldsig().
* src/login.c: Tag the `sig' parameter of alarm_handler() as
  unused.
* src/sulogin.c: Tag the `sig' parameter of catch_signals() as
  unused.
* libmisc/getdate.y: Tag the `string' parameter of yyerror() as
  unused.
* libmisc/getdate.y: The string provided to yyerror() is const.
* libmisc/getdate.y: Fix the prototypes of yylex() and yyerror().

src/expiry.c

@@ -44,7 +44,7 @@ static void usage (void);
 /*
  * catch_signals - signal catcher
  */
-static RETSIGTYPE catch_signals (int sig)
+static RETSIGTYPE catch_signals (unused int sig)
 {
 	exit (10);
 }

src/login.c

@@ -290,7 +290,7 @@ static void init_env (void)
 }
 
 
-static RETSIGTYPE alarm_handler (int sig)
+static RETSIGTYPE alarm_handler (unused int sig)
 {
 	fprintf (stderr, _("\nLogin timed out after %d seconds.\n"), timeout);
 	exit (0);

src/su.c

@@ -164,7 +164,7 @@ static void su_failure (const char *tty)
 
 #ifdef USE_PAM
 /* Signal handler for parent process later */
-static void catch_signals (int sig)
+static void catch_signals (unused int sig)
 {
 	++caught;
 }
@@ -316,7 +316,7 @@ int main (int argc, char **argv)
 #else				/* !USE_PAM */
 	int err = 0;
 
-	RETSIGTYPE (*oldsig) ();
+	RETSIGTYPE (*oldsig) (int);
 	int is_console = 0;
 
 	struct spwd *spwd = 0;

src/sulogin.c

@@ -61,7 +61,7 @@ extern char **environ;
 /* local function prototypes */
 static RETSIGTYPE catch_signals (int);
 
-static RETSIGTYPE catch_signals (int sig)
+static RETSIGTYPE catch_signals (unused int sig)
 {
 	exit (1);
 }