*: 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, 10 insertions, 7 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index fec99c5ce..de27dd80e 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -123,7 +123,8 @@ int find_applet_by_name(const char *name)
 int *const bb_errno __attribute__ ((section (".data")));
 #endif
 
-void lbb_prepare(const char *applet, char **argv)
+void lbb_prepare(const char *applet
+                USE_FEATURE_INDIVIDUAL(, char **argv))
 {
 #ifdef __GLIBC__
         (*(int **)&bb_errno) = __errno_location();
@@ -662,10 +663,10 @@ void run_applet_and_exit(const char *name, char **argv)
 #if ENABLE_BUILD_LIBBUSYBOX
 int lbb_main(int argc, char **argv)
 #else
-int main(int argc, char **argv)
+int main(int argc ATTRIBUTE_UNUSED, char **argv)
 #endif
 {
-        lbb_prepare("busybox", argv);
+        lbb_prepare("busybox" USE_FEATURE_INDIVIDUAL(, argv));
 
 #if !BB_MMU
         /* NOMMU re-exec trick sets high-order bit in first byte of name */
diff --git a/libbb/procps.c b/libbb/procps.c
index 015ad80ef..f67f7dcde 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -93,7 +93,7 @@ static int read_to_buf(const char *filename, void *buf)
         return ret;
 }
 
-procps_status_t *alloc_procps_scan(int flags)
+static procps_status_t *alloc_procps_scan(void)
 {
         unsigned n = getpagesize();
         procps_status_t* sp = xzalloc(sizeof(procps_status_t));
@@ -175,7 +175,7 @@ procps_status_t *procps_scan(procps_status_t* sp, int flags)
         struct stat sb;
 
         if (!sp)
-                sp = alloc_procps_scan(flags);
+                sp = alloc_procps_scan();
 
         for (;;) {
                 entry = readdir(sp->dir);
diff --git a/libbb/recursive_action.c b/libbb/recursive_action.c
index 37363bb3e..513aff315 100644
--- a/libbb/recursive_action.c
+++ b/libbb/recursive_action.c
@@ -22,8 +22,10 @@
  * is so stinking huge.
  */
 
-static int true_action(const char *fileName, struct stat *statbuf,
-                                                void* userData, int depth)
+static int true_action(const char *fileName ATTRIBUTE_UNUSED,
+                struct stat *statbuf ATTRIBUTE_UNUSED,
+                void* userData ATTRIBUTE_UNUSED,
+                int depth ATTRIBUTE_UNUSED)
 {
         return TRUE;
 }