*: add -Wunused-parameter; fix resulting breakage

function                                             old     new   delta
procps_scan                                         1265    1298     +33
aliascmd                                             278     283      +5
parse_file_cmd                                       116     120      +4
dname_enc                                            373     377      +4
setcmd                                                90      93      +3
execcmd                                               57      60      +3
count_lines                                           72      74      +2
process_command_subs                                 340     339      -1
test_main                                            409     407      -2
mknod_main                                           179     177      -2
handle_incoming_and_exit                            2653    2651      -2
argstr                                              1312    1310      -2
shiftcmd                                             131     128      -3
exitcmd                                               46      43      -3
dotcmd                                               297     294      -3
breakcmd                                              86      83      -3
evalpipe                                             353     349      -4
evalcommand                                         1180    1176      -4
evalcmd                                              109     105      -4
send_tree                                            374     369      -5
mkfifo_main                                           82      77      -5
evalsubshell                                         152     147      -5
typecmd                                               75      69      -6
letcmd                                                61      55      -6
add_cmd                                             1190    1183      -7
main                                                 891     883      -8
ash_main                                            1415    1407      -8
parse_stream                                        1377    1367     -10
alloc_procps_scan                                     55       -     -55
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 7/21 up/down: 54/-148)          Total: -94 bytes
   text    data     bss     dec     hex filename
 797195     658    7428  805281   c49a1 busybox_old
 797101     658    7428  805187   c4943 busybox_unstripped

3 files changed, 113 insertions, 110 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 069909118..580918ceb 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -2472,7 +2472,7 @@ docd(const char *dest, int flags)
 }
 
 static int
-cdcmd(int argc, char **argv)
+cdcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         const char *dest;
         const char *path;
@@ -2536,7 +2536,7 @@ cdcmd(int argc, char **argv)
 }
 
 static int
-pwdcmd(int argc, char **argv)
+pwdcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         int flags;
         const char *dir = curdir;
@@ -3138,19 +3138,20 @@ printalias(const struct alias *ap)
  * TODO - sort output
  */
 static int
-aliascmd(int argc, char **argv)
+aliascmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         char *n, *v;
         int ret = 0;
         struct alias *ap;
 
-        if (argc == 1) {
+        if (!argv[1]) {
                 int i;
 
-                for (i = 0; i < ATABSIZE; i++)
+                for (i = 0; i < ATABSIZE; i++) {
                         for (ap = atab[i]; ap; ap = ap->next) {
                                 printalias(ap);
                         }
+                }
                 return 0;
         }
         while ((n = *++argv) != NULL) {
@@ -3172,7 +3173,7 @@ aliascmd(int argc, char **argv)
 }
 
 static int
-unaliascmd(int argc, char **argv)
+unaliascmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         int i;
 
@@ -3245,7 +3246,7 @@ struct job {
 static pid_t backgndpid;        /* pid of last background process */
 static smallint job_warning;    /* user was warned about stopped jobs (can be 2, 1 or 0). */
 
-static struct job *makejob(union node *, int);
+static struct job *makejob(/*union node *,*/ int);
 static int forkshell(struct job *, union node *, int);
 static int waitforjob(struct job *);
 
@@ -3612,8 +3613,8 @@ setjobctl(int on)
 static int
 killcmd(int argc, char **argv)
 {
+        int i = 1;
         if (argv[1] && strcmp(argv[1], "-l") != 0) {
-                int i = 1;
                 do {
                         if (argv[i][0] == '%') {
                                 struct job *jp = getjob(argv[i], 0);
@@ -3675,7 +3676,7 @@ restartjob(struct job *jp, int mode)
 }
 
 static int
-fg_bgcmd(int argc, char **argv)
+fg_bgcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         struct job *jp;
         FILE *out;
@@ -3962,7 +3963,7 @@ showjobs(FILE *out, int mode)
 }
 
 static int
-jobscmd(int argc, char **argv)
+jobscmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int mode, m;
 
@@ -4015,7 +4016,7 @@ getstatus(struct job *job)
 }
 
 static int
-waitcmd(int argc, char **argv)
+waitcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         struct job *job;
         int retval;
@@ -4121,7 +4122,7 @@ growjobtab(void)
  * Called with interrupts off.
  */
 static struct job *
-makejob(union node *node, int nprocs)
+makejob(/*union node *node,*/ int nprocs)
 {
         int i;
         struct job *jp;
@@ -4156,7 +4157,7 @@ makejob(union node *node, int nprocs)
         if (nprocs > 1) {
                 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
         }
-        TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
+        TRACE(("makejob(%d) returns %%%d\n", nprocs,
                                 jobno(jp)));
         return jp;
 }
@@ -4484,7 +4485,7 @@ static void closescript(void);
 
 /* Called after fork(), in child */
 static void
-forkchild(struct job *jp, union node *n, int mode)
+forkchild(struct job *jp, /*union node *n,*/ int mode)
 {
         int oldlvl;
 
@@ -4584,7 +4585,7 @@ forkshell(struct job *jp, union node *n, int mode)
                 ash_msg_and_raise_error("cannot fork");
         }
         if (pid == 0)
-                forkchild(jp, n, mode);
+                forkchild(jp, /*n,*/ mode);
         else
                 forkparent(jp, n, mode, pid);
         return pid;
@@ -5371,7 +5372,7 @@ evalbackcmd(union node *n, struct backcmd *result)
 
                 if (pipe(pip) < 0)
                         ash_msg_and_raise_error("pipe call failed");
-                jp = makejob(n, 1);
+                jp = makejob(/*n,*/ 1);
                 if (forkshell(jp, n, FORK_NOJOB) == 0) {
                         FORCE_INT_ON;
                         close(pip[0]);
@@ -5668,7 +5669,7 @@ argstr(char *p, int flag, struct strlist *var_str_list)
 }
 
 static char *
-scanleft(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
+scanleft(char *startp, char *rmesc, char *rmescend ATTRIBUTE_UNUSED, char *str, int quotes,
         int zero)
 {
         char *loc;
@@ -6407,7 +6408,7 @@ expsort(struct strlist *str)
 }
 
 static void
-expandmeta(struct strlist *str, int flag)
+expandmeta(struct strlist *str /*, int flag*/)
 {
         static const char metachars[] ALIGN1 = {
                 '*', '?', '[', 0
@@ -6488,7 +6489,7 @@ expandarg(union node *arg, struct arglist *arglist, int flag)
                 ifsbreakup(p, &exparg);
                 *exparg.lastp = NULL;
                 exparg.lastp = &exparg.list;
-                expandmeta(exparg.list, flag);
+                expandmeta(exparg.list /*, flag*/);
         } else {
                 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
                         rmescapes(p);
@@ -6838,7 +6839,7 @@ addcmdentry(char *name, struct cmdentry *entry)
 }
 
 static int
-hashcmd(int argc, char **argv)
+hashcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         struct tblentry **pp;
         struct tblentry *cmdp;
@@ -7139,7 +7140,7 @@ describe_command(char *command, int describe_command_verbose)
 }
 
 static int
-typecmd(int argc, char **argv)
+typecmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int i = 1;
         int err = 0;
@@ -7150,7 +7151,7 @@ typecmd(int argc, char **argv)
                 i++;
                 verbose = 0;
         }
-        while (i < argc) {
+        while (argv[i]) {
                 err |= describe_command(argv[i++], verbose);
         }
         return err;
@@ -7158,7 +7159,7 @@ typecmd(int argc, char **argv)
 
 #if ENABLE_ASH_CMDCMD
 static int
-commandcmd(int argc, char **argv)
+commandcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         int c;
         enum {
@@ -7768,7 +7769,7 @@ evalsubshell(union node *n, int flags)
         if (!backgnd && flags & EV_EXIT && !trap[0])
                 goto nofork;
         INT_OFF;
-        jp = makejob(n, 1);
+        jp = makejob(/*n,*/ 1);
         if (forkshell(jp, n, backgnd) == 0) {
                 INT_ON;
                 flags |= EV_EXIT;
@@ -7843,7 +7844,7 @@ evalpipe(union node *n, int flags)
                 pipelen++;
         flags |= EV_EXIT;
         INT_OFF;
-        jp = makejob(n, pipelen);
+        jp = makejob(/*n,*/ pipelen);
         prevfd = -1;
         for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
                 prehash(lp->n);
@@ -8098,7 +8099,7 @@ mklocal(char *name)
  * The "local" command.
  */
 static int
-localcmd(int argc, char **argv)
+localcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         char *name;
 
@@ -8110,21 +8111,21 @@ localcmd(int argc, char **argv)
 }
 
 static int
-falsecmd(int argc, char **argv)
+falsecmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         return 1;
 }
 
 static int
-truecmd(int argc, char **argv)
+truecmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         return 0;
 }
 
 static int
-execcmd(int argc, char **argv)
+execcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
-        if (argc > 1) {
+        if (argv[1]) {
                 iflag = 0;              /* exit on error */
                 mflag = 0;
                 optschanged();
@@ -8137,7 +8138,7 @@ execcmd(int argc, char **argv)
  * The return command.
  */
 static int
-returncmd(int argc, char **argv)
+returncmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         /*
          * If called outside a function, do what ksh does;
@@ -8296,7 +8297,7 @@ isassignment(const char *p)
         return *q == '=';
 }
 static int
-bltincmd(int argc, char **argv)
+bltincmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         /* Preserve exitstatus of a previous possible redirection
          * as POSIX mandates */
@@ -8466,7 +8467,7 @@ evalcommand(union node *cmd, int flags)
                 /* Fork off a child process if necessary. */
                 if (!(flags & EV_EXIT) || trap[0]) {
                         INT_OFF;
-                        jp = makejob(cmd, 1);
+                        jp = makejob(/*cmd,*/ 1);
                         if (forkshell(jp, cmd, FORK_FG) != 0) {
                                 exitstatus = waitforjob(jp);
                                 INT_ON;
@@ -8596,9 +8597,9 @@ prehash(union node *n)
  * in the standard shell so we don't make it one here.
  */
 static int
-breakcmd(int argc, char **argv)
+breakcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
-        int n = argc > 1 ? number(argv[1]) : 1;
+        int n = argv[1] ? number(argv[1]) : 1;
 
         if (n <= 0)
                 ash_msg_and_raise_error(illnum, argv[1]);
@@ -9095,7 +9096,7 @@ chkmail(void)
 }
 
 static void
-changemail(const char *val)
+changemail(const char *val ATTRIBUTE_UNUSED)
 {
         mail_var_path_changed = 1;
 }
@@ -9247,13 +9248,13 @@ options(int cmdline)
  * The shift builtin command.
  */
 static int
-shiftcmd(int argc, char **argv)
+shiftcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int n;
         char **ap1, **ap2;
 
         n = 1;
-        if (argc > 1)
+        if (argv[1])
                 n = number(argv[1]);
         if (n > shellparam.nparam)
                 ash_msg_and_raise_error("can't shift that many");
@@ -9308,11 +9309,11 @@ showvars(const char *sep_prefix, int on, int off)
  * The set command builtin.
  */
 static int
-setcmd(int argc, char **argv)
+setcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         int retval;
 
-        if (argc == 1)
+        if (!argv[1])
                 return showvars(nullstr, 0, VUNSET);
         INT_OFF;
         retval = 1;
@@ -11015,20 +11016,19 @@ evalstring(char *s, int mask)
  * The eval command.
  */
 static int
-evalcmd(int argc, char **argv)
+evalcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         char *p;
         char *concat;
-        char **ap;
 
-        if (argc > 1) {
+        if (argv[1]) {
                 p = argv[1];
-                if (argc > 2) {
+                argv += 2;
+                if (argv[0]) {
                         STARTSTACKSTR(concat);
-                        ap = argv + 2;
                         for (;;) {
                                 concat = stack_putstr(p, concat);
-                                p = *ap++;
+                                p = *argv++;
                                 if (p == NULL)
                                         break;
                                 STPUTC(' ', concat);
@@ -11139,16 +11139,15 @@ dotcmd(int argc, char **argv)
         for (sp = cmdenviron; sp; sp = sp->next)
                 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
 
-        if (argc >= 2) {        /* That's what SVR2 does */
-                char *fullname;
-
-                fullname = find_dot_file(argv[1]);
-
-                if (argc > 2) {
+        if (argv[1]) {        /* That's what SVR2 does */
+                char *fullname = find_dot_file(argv[1]);
+                argv += 2;
+                argc -= 2;
+                if (argc) { /* argc > 0, argv[0] != NULL */
                         saveparam = shellparam;
                         shellparam.malloced = 0;
-                        shellparam.nparam = argc - 2;
-                        shellparam.p = argv + 2;
+                        shellparam.nparam = argc;
+                        shellparam.p = argv;
                 };
 
                 setinputfile(fullname, INPUT_PUSH_FILE);
@@ -11156,7 +11155,7 @@ dotcmd(int argc, char **argv)
                 cmdloop(0);
                 popfile();
 
-                if (argc > 2) {
+                if (argc) {
                         freeparam(&shellparam);
                         shellparam = saveparam;
                 };
@@ -11166,11 +11165,11 @@ dotcmd(int argc, char **argv)
 }
 
 static int
-exitcmd(int argc, char **argv)
+exitcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         if (stoppedjobs())
                 return 0;
-        if (argc > 1)
+        if (argv[1])
                 exitstatus = number(argv[1]);
         raise_exception(EXEXIT);
         /* NOTREACHED */
@@ -11404,7 +11403,7 @@ find_command(char *name, struct cmdentry *entry, int act, const char *path)
  * The trap builtin.
  */
 static int
-trapcmd(int argc, char **argv)
+trapcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         char *action;
         char **ap;
@@ -11457,7 +11456,7 @@ trapcmd(int argc, char **argv)
  * Lists available builtins
  */
 static int
-helpcmd(int argc, char **argv)
+helpcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         int col, i;
 
@@ -11492,7 +11491,7 @@ helpcmd(int argc, char **argv)
  * The export and readonly commands.
  */
 static int
-exportcmd(int argc, char **argv)
+exportcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         struct var *vp;
         char *name;
@@ -11543,7 +11542,7 @@ unsetfunc(const char *name)
  * with the same name.
  */
 static int
-unsetcmd(int argc, char **argv)
+unsetcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         char **ap;
         int i;
@@ -11581,7 +11580,7 @@ static const unsigned char timescmd_str[] ALIGN1 = {
 };
 
 static int
-timescmd(int ac, char **av)
+timescmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         long clk_tck, s, t;
         const unsigned char *p;
@@ -11633,17 +11632,16 @@ dash_arith(const char *s)
  *  Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
  */
 static int
-letcmd(int argc, char **argv)
+letcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
-        char **ap;
-        arith_t i = 0;
+        arith_t i;
 
-        ap = argv + 1;
-        if (!*ap)
+        argv++;
+        if (!*argv)
                 ash_msg_and_raise_error("expression expected");
-        for (ap = argv + 1; *ap; ap++) {
-                i = dash_arith(*ap);
-        }
+        do {
+                i = dash_arith(*argv);
+        } while (*++argv);
 
         return !i;
 }
@@ -11668,7 +11666,7 @@ typedef enum __rlimit_resource rlim_t;
  * This uses unbuffered input, which may be avoidable in some cases.
  */
 static int
-readcmd(int argc, char **argv)
+readcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         char **ap;
         int backslash;
@@ -11859,7 +11857,7 @@ readcmd(int argc, char **argv)
 }
 
 static int
-umaskcmd(int argc, char **argv)
+umaskcmd(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         static const char permuser[3] ALIGN1 = "ugo";
         static const char permmode[3] ALIGN1 = "rwx";
@@ -12034,7 +12032,7 @@ printlim(enum limtype how, const struct rlimit *limit,
 }
 
 static int
-ulimitcmd(int argc, char **argv)
+ulimitcmd(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
 {
         int c;
         rlim_t val = 0;
@@ -12868,7 +12866,7 @@ init(void)
  * Process the shell command line arguments.
  */
 static void
-procargs(int argc, char **argv)
+procargs(char **argv)
 {
         int i;
         const char *xminusc;
@@ -12876,7 +12874,7 @@ procargs(int argc, char **argv)
 
         xargv = argv;
         arg0 = xargv[0];
-        if (argc > 0)
+        /* if (xargv[0]) - mmm, this is always true! */
                 xargv++;
         for (i = 0; i < NOPTS; i++)
                 optlist[i] = 2;
@@ -12976,7 +12974,7 @@ extern int etext();
  * is used to figure out how far we had gotten.
  */
 int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int ash_main(int argc, char **argv)
+int ash_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         char *shinit;
         volatile int state;
@@ -13039,7 +13037,8 @@ int ash_main(int argc, char **argv)
 #endif
         init();
         setstackmark(&smark);
-        procargs(argc, argv);
+        procargs(argv);
+
 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
         if (iflag) {
                 const char *hp = lookupvar("HISTFILE");
diff --git a/shell/hush.c b/shell/hush.c
index c61607dd3..2d5697269 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -536,11 +536,13 @@ static int done_pipe(struct p_context *ctx, pipe_style type);
 static int redirect_dup_num(struct in_str *input);
 static int redirect_opt_num(o_string *o);
 #if ENABLE_HUSH_TICK
-static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, const char *subst_end);
+static int process_command_subs(o_string *dest, /*struct p_context *ctx,*/
+                struct in_str *input, const char *subst_end);
 #endif
 static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
 static const char *lookup_param(const char *src);
-static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
+static int handle_dollar(o_string *dest, /*struct p_context *ctx,*/
+                struct in_str *input);
 static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, const char *end_trigger);
 /*   setup: */
 static int parse_and_run_stream(struct in_str *inp, int parse_flag);
@@ -741,14 +743,14 @@ static void set_every_sighandler(void (*handler)(int))
         signal(SIGCHLD, handler);
 }
 
-static void handler_ctrl_c(int sig)
+static void handler_ctrl_c(int sig ATTRIBUTE_UNUSED)
 {
         debug_printf_jobs("got sig %d\n", sig);
 // as usual we can have all kinds of nasty problems with leaked malloc data here
         siglongjmp(toplevel_jb, 1);
 }
 
-static void handler_ctrl_z(int sig)
+static void handler_ctrl_z(int sig ATTRIBUTE_UNUSED)
 {
         pid_t pid;
 
@@ -3257,8 +3259,10 @@ static FILE *generate_stream_from_list(struct pipe *head)
 }
 
 /* Return code is exit status of the process that is run. */
-static int process_command_subs(o_string *dest, struct p_context *ctx,
-        struct in_str *input, const char *subst_end)
+static int process_command_subs(o_string *dest,
+                /*struct p_context *ctx,*/
+                struct in_str *input,
+                const char *subst_end)
 {
         int retcode, ch, eol_cnt;
         o_string result = NULL_O_STRING;
@@ -3351,7 +3355,7 @@ static const char *lookup_param(const char *src)
 }
 
 /* return code: 0 for OK, 1 for syntax error */
-static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
+static int handle_dollar(o_string *dest, /*struct p_context *ctx,*/ struct in_str *input)
 {
         int ch = b_peek(input);  /* first character after the $ */
         unsigned char quote_mask = dest->o_quote ? 0x80 : 0;
@@ -3409,7 +3413,7 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i
 #if ENABLE_HUSH_TICK
                 case '(':
                         b_getch(input);
-                        process_command_subs(dest, ctx, input, ")");
+                        process_command_subs(dest, /*ctx,*/ input, ")");
                         break;
 #endif
                 case '-':
@@ -3507,7 +3511,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
                         b_addqchr(dest, b_getch(input), dest->o_quote);
                         break;
                 case '$':
-                        if (handle_dollar(dest, ctx, input) != 0) {
+                        if (handle_dollar(dest, /*ctx,*/ input) != 0) {
                                 debug_printf_parse("parse_stream return 1: handle_dollar returned non-0\n");
                                 return 1;
                         }
@@ -3532,7 +3536,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
                         break;
 #if ENABLE_HUSH_TICK
                 case '`':
-                        process_command_subs(dest, ctx, input, "`");
+                        process_command_subs(dest, /*ctx,*/ input, "`");
                         break;
 #endif
                 case '>':
diff --git a/shell/msh.c b/shell/msh.c
index 5ed6dfd1d..63f365962 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -589,7 +589,7 @@ static const struct builtincmd builtincmds[] = {
 };
 
 static struct op *scantree(struct op *);
-static struct op *dowholefile(int, int);
+static struct op *dowholefile(int /*, int*/);
 
 
 /* Globals */
@@ -1448,7 +1448,7 @@ static void next(int f)
         PUSHIO(afile, f, filechar);
 }
 
-static void onintr(int s)                                       /* ANSI C requires a parameter */
+static void onintr(int s ATTRIBUTE_UNUSED) /* ANSI C requires a parameter */
 {
         signal(SIGINT, onintr);
         intr = 1;
@@ -1864,11 +1864,11 @@ static struct op *command(int cf)
         return t;
 }
 
-static struct op *dowholefile(int type, int mark)
+static struct op *dowholefile(int type /*, int mark*/)
 {
         struct op *t;
 
-        DBGPRINTF(("DOWHOLEFILE: enter, type=%d, mark=%d\n", type, mark));
+        DBGPRINTF(("DOWHOLEFILE: enter, type=%d\n", type /*, mark*/));
 
         multiline++;
         t = c_list();
@@ -2477,7 +2477,7 @@ static int execute(struct op *t, int *pin, int *pout, int no_fork)
 
                 newfile(evalstr(t->op_words[0], DOALL));
 
-                t->left = dowholefile(TLIST, 0);
+                t->left = dowholefile(TLIST /*, 0*/);
                 t->right = NULL;
 
                 outtree = outtree_save;
@@ -3155,7 +3155,7 @@ static int run(struct ioarg *argp, int (*f) (struct ioarg *))
  * built-in commands: doX
  */
 
-static int dohelp(struct op *t, char **args)
+static int dohelp(struct op *t ATTRIBUTE_UNUSED, char **args ATTRIBUTE_UNUSED)
 {
         int col;
         const struct builtincmd *x;
@@ -3191,12 +3191,12 @@ static int dohelp(struct op *t, char **args)
         return EXIT_SUCCESS;
 }
 
-static int dolabel(struct op *t, char **args)
+static int dolabel(struct op *t ATTRIBUTE_UNUSED, char **args ATTRIBUTE_UNUSED)
 {
         return 0;
 }
 
-static int dochdir(struct op *t, char **args)
+static int dochdir(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         const char *cp, *er;
 
@@ -3217,7 +3217,7 @@ static int dochdir(struct op *t, char **args)
         return 1;
 }
 
-static int doshift(struct op *t, char **args)
+static int doshift(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         int n;
 
@@ -3236,7 +3236,7 @@ static int doshift(struct op *t, char **args)
 /*
  * execute login and newgrp directly
  */
-static int dologin(struct op *t, char **args)
+static int dologin(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         const char *cp;
 
@@ -3251,7 +3251,7 @@ static int dologin(struct op *t, char **args)
         return 1;
 }
 
-static int doumask(struct op *t, char **args)
+static int doumask(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         int i;
         char *cp;
@@ -3301,7 +3301,7 @@ static int doexec(struct op *t, char **args)
         return 1;
 }
 
-static int dodot(struct op *t, char **args)
+static int dodot(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         int i;
         const char *sp;
@@ -3355,7 +3355,7 @@ static int dodot(struct op *t, char **args)
         return -1;
 }
 
-static int dowait(struct op *t, char **args)
+static int dowait(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         int i;
         char *cp;
@@ -3371,7 +3371,7 @@ static int dowait(struct op *t, char **args)
         return 0;
 }
 
-static int doread(struct op *t, char **args)
+static int doread(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         char *cp, **wp;
         int nb = 0;
@@ -3398,12 +3398,12 @@ static int doread(struct op *t, char **args)
         return nb <= 0;
 }
 
-static int doeval(struct op *t, char **args)
+static int doeval(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         return RUN(awordlist, args + 1, wdchar);
 }
 
-static int dotrap(struct op *t, char **args)
+static int dotrap(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         int n, i;
         int resetsig;
@@ -3484,12 +3484,12 @@ static int getn(char *as)
         return n * m;
 }
 
-static int dobreak(struct op *t, char **args)
+static int dobreak(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         return brkcontin(args[1], 1);
 }
 
-static int docontinue(struct op *t, char **args)
+static int docontinue(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         return brkcontin(args[1], 0);
 }
@@ -3517,7 +3517,7 @@ static int brkcontin(char *cp, int val)
         /* NOTREACHED */
 }
 
-static int doexit(struct op *t, char **args)
+static int doexit(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         char *cp;
 
@@ -3533,13 +3533,13 @@ static int doexit(struct op *t, char **args)
         return 0;
 }
 
-static int doexport(struct op *t, char **args)
+static int doexport(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         rdexp(args + 1, export, EXPORT);
         return 0;
 }
 
-static int doreadonly(struct op *t, char **args)
+static int doreadonly(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         rdexp(args + 1, ronly, RONLY);
         return 0;
@@ -3575,7 +3575,7 @@ static void badid(char *s)
         err(": bad identifier");
 }
 
-static int doset(struct op *t, char **args)
+static int doset(struct op *t ATTRIBUTE_UNUSED, char **args)
 {
         struct var *vp;
         char *cp;
@@ -3650,7 +3650,7 @@ static void times_fmt(char *buf, clock_t val, unsigned clk_tck)
 #endif
 }
 
-static int dotimes(struct op *t, char **args)
+static int dotimes(struct op *t ATTRIBUTE_UNUSED, char **args ATTRIBUTE_UNUSED)
 {
         struct tms buf;
         unsigned clk_tck = sysconf(_SC_CLK_TCK);