* 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().

libmisc/getdate.y

@@ -112,8 +112,8 @@
 #define yytable  gd_yytable
 #define yycheck  gd_yycheck
 
-static int yylex ();
-static int yyerror (char *s);
+static int yylex (void);
+static int yyerror (const char *s);
 
 #define EPOCH		1970
 #define HOUR(x)		((x) * 60)
@@ -595,8 +595,7 @@ static TABLE const MilitaryTable[] = {
 
 
 
-/* ARGSUSED */
-static int yyerror (char *s)
+static int yyerror (unused const char *s)
 {
   return 0;
 }
@@ -762,7 +761,7 @@ static int LookupWord (char *buff)
 }
 
 static int
-yylex ()
+yylex (void)
 {
   register char c;
   register char *p;

libmisc/loginprompt.c

@@ -37,7 +37,8 @@
 #include "prototypes.h"
 #include "defines.h"
 #include "getdef.h"
-static void login_exit (int sig)
+
+static void login_exit (unused int sig)
 {
 	exit (1);
 }

libmisc/obscure.c

@@ -47,7 +47,7 @@
 /*
  * can't be a palindrome - like `R A D A R' or `M A D A M'
  */
- /*ARGSUSED*/ static int palindrome (const char *old, const char *new)
+static int palindrome (unused const char *old, const char *new)
 {
 	int i, j;
 
@@ -64,7 +64,7 @@
  * more than half of the characters are different ones.
  */
 
- /*ARGSUSED*/ static int similar (const char *old, const char *new)
+static int similar (const char *old, const char *new)
 {
 	int i, j;
 
@@ -91,7 +91,7 @@
  * a nice mix of characters.
  */
 
- /*ARGSUSED*/ static int simple (const char *old, const char *new)
+static int simple (unused const char *old, const char *new)
 {
 	int digits = 0;
 	int uppers = 0;