*: 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

14 files changed, 26 insertions, 22 deletions

diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index cdd385ede..9e834ffd3 100644
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -13,7 +13,7 @@
 #include "libbb.h"
 
 int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int dmesg_main(int argc, char **argv)
+int dmesg_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int len;
         char *buf;
diff --git a/util-linux/fsck_minix.c b/util-linux/fsck_minix.c
index 63f915ac5..058e8bed7 100644
--- a/util-linux/fsck_minix.c
+++ b/util-linux/fsck_minix.c
@@ -1204,7 +1204,7 @@ void check2(void);
 #endif
 
 int fsck_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int fsck_minix_main(int argc, char **argv)
+int fsck_minix_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         struct termios tmp;
         int retcode = 0;
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index f226535fa..44522dfd7 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -91,7 +91,7 @@ static void from_sys_clock(int utc)
 #define HWCLOCK_OPT_RTCFILE     0x20
 
 int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int hwclock_main(int argc, char **argv)
+int hwclock_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         unsigned opt;
         int utc;
diff --git a/util-linux/ipcs.c b/util-linux/ipcs.c
index 97b98f300..4b5c597e5 100644
--- a/util-linux/ipcs.c
+++ b/util-linux/ipcs.c
@@ -559,7 +559,7 @@ static void print_sem(int semid)
 }
 
 int ipcs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int ipcs_main(int argc, char **argv)
+int ipcs_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int id = 0;
         unsigned flags = 0;
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 9c33feb35..0edaf1047 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -244,8 +244,10 @@ static void make_device(char *path, int delete)
 }
 
 /* File callback for /sys/ traversal */
-static int fileAction(const char *fileName, struct stat *statbuf,
-                      void *userData, int depth)
+static int fileAction(const char *fileName,
+                      struct stat *statbuf ATTRIBUTE_UNUSED,
+                      void *userData,
+                      int depth ATTRIBUTE_UNUSED)
 {
         size_t len = strlen(fileName) - 4;
         char *scratch = userData;
@@ -261,8 +263,10 @@ static int fileAction(const char *fileName, struct stat *statbuf,
 }
 
 /* Directory callback for /sys/ traversal */
-static int dirAction(const char *fileName, struct stat *statbuf,
-                      void *userData, int depth)
+static int dirAction(const char *fileName ATTRIBUTE_UNUSED,
+                      struct stat *statbuf ATTRIBUTE_UNUSED,
+                      void *userData ATTRIBUTE_UNUSED,
+                      int depth)
 {
         return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
 }
diff --git a/util-linux/mkfs_minix.c b/util-linux/mkfs_minix.c
index a784b72f4..3fbdc2020 100644
--- a/util-linux/mkfs_minix.c
+++ b/util-linux/mkfs_minix.c
@@ -495,7 +495,7 @@ static size_t do_check(char *buffer, size_t try, unsigned current_block)
         return try;
 }
 
-static void alarm_intr(int alnum)
+static void alarm_intr(int alnum ATTRIBUTE_UNUSED)
 {
         if (G.currently_testing >= SB_ZONES)
                 return;
@@ -621,7 +621,7 @@ static void setup_tables(void)
 }
 
 int mkfs_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int mkfs_minix_main(int argc, char **argv)
+int mkfs_minix_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         struct mntent *mp;
         unsigned opt;
diff --git a/util-linux/more.c b/util-linux/more.c
index 2d5535991..257f40168 100644
--- a/util-linux/more.c
+++ b/util-linux/more.c
@@ -36,7 +36,7 @@ struct globals {
 #define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
 #define getTermSettings(fd, argp) tcgetattr(fd, argp)
 
-static void gotsig(int sig)
+static void gotsig(int sig ATTRIBUTE_UNUSED)
 {
         bb_putchar('\n');
         setTermSettings(cin_fileno, &initial_settings);
@@ -51,7 +51,7 @@ static void gotsig(int sig)
 #define CONVERTED_TAB_SIZE 8
 
 int more_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int more_main(int argc, char **argv)
+int more_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int c = c; /* for gcc */
         int lines;
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 796e1e103..6e63a01fc 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -909,7 +909,7 @@ static inline int daemonize(void) { return -ENOSYS; }
 #endif
 
 // TODO
-static inline int we_saw_this_host_before(const char *hostname)
+static inline int we_saw_this_host_before(const char *hostname ATTRIBUTE_UNUSED)
 {
         return 0;
 }
diff --git a/util-linux/rdate.c b/util-linux/rdate.c
index 150efbec4..9e7bdba35 100644
--- a/util-linux/rdate.c
+++ b/util-linux/rdate.c
@@ -12,7 +12,7 @@
 
 enum { RFC_868_BIAS = 2208988800UL };
 
-static void socket_timeout(int sig)
+static void socket_timeout(int sig ATTRIBUTE_UNUSED)
 {
         bb_error_msg_and_die("timeout connecting to time server");
 }
@@ -43,7 +43,7 @@ static time_t askremotedate(const char *host)
 }
 
 int rdate_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int rdate_main(int argc, char **argv)
+int rdate_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         time_t remote_time;
         unsigned long flags;
diff --git a/util-linux/readprofile.c b/util-linux/readprofile.c
index c6152558c..ef7865951 100644
--- a/util-linux/readprofile.c
+++ b/util-linux/readprofile.c
@@ -42,7 +42,7 @@ static const char defaultmap[] ALIGN1 = "/boot/System.map";
 static const char defaultpro[] ALIGN1 = "/proc/profile";
 
 int readprofile_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int readprofile_main(int argc, char **argv)
+int readprofile_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         FILE *map;
         const char *mapFile, *proFile, *mult = 0;
diff --git a/util-linux/rtcwake.c b/util-linux/rtcwake.c
index 2b1ab1fca..6df7334fe 100644
--- a/util-linux/rtcwake.c
+++ b/util-linux/rtcwake.c
@@ -107,7 +107,7 @@ static void suspend_system(const char *suspend)
 #define RTCWAKE_OPT_TIME         0x40
 
 int rtcwake_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int rtcwake_main(int argc, char **argv)
+int rtcwake_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         unsigned opt;
         const char *rtcname = NULL;
diff --git a/util-linux/script.c b/util-linux/script.c
index a4aaa422f..c37fd9d61 100644
--- a/util-linux/script.c
+++ b/util-linux/script.c
@@ -15,13 +15,13 @@
 
 static smallint fd_count = 2;
 
-static void handle_sigchld(int sig)
+static void handle_sigchld(int sig ATTRIBUTE_UNUSED)
 {
         fd_count = 0;
 }
 
-int script_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
-int script_main(int argc, char *argv[])
+int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int script_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int opt;
         int mode;
diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index 3a1741179..c030b99e1 100644
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -65,7 +65,7 @@ static void delete_contents(const char *directory)
 }
 
 int switch_root_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int switch_root_main(int argc, char **argv)
+int switch_root_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         char *newroot, *console = NULL;
         struct stat st1, st2;
diff --git a/util-linux/umount.c b/util-linux/umount.c
index 3f7c0abbd..6136fa97c 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -27,7 +27,7 @@
 //#define MNT_DETACH 0x00000002 /* Just detach from the tree */
 
 int umount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int umount_main(int argc, char **argv)
+int umount_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
         int doForce;
         char *const path = xmalloc(PATH_MAX + 2); /* to save stack */