Functions should be either exported in public .h files

and marked with libc_hidden_proto/def(),
or not be exported in .h files
and be hidden (or even static if possible).
We have five functions which violate this. Fixing:

netdb.h: export ruserpass()
rpc/rpc.h: export xdr_accepted_reply() and xdr_rejected_reply()
make inet_ntoa_r static function (it is not exported in any .h file)
make _time_tzset hidden function (it is not exported in any .h file)

include/netdb.h

@@ -444,6 +444,11 @@ extern int getnetgrent_r (char **__restrict __hostp,
 #endif	/* misc */
 
 
+/* ruserpass - remote password check.
+   This function also exists in glibc but is undocumented */
+extern int ruserpass(const char *host, const char **aname, const char **apass);
+
+
 #ifdef __USE_BSD
 /* Call `rshd' at port RPORT on remote machine *AHOST to execute CMD.
    The local user is LOCUSER, on the remote machine the command is

include/rpc/rpc.h

@@ -105,6 +105,9 @@ extern struct pollfd **__rpc_thread_svc_pollfd (void)
 extern int *__rpc_thread_svc_max_pollfd (void) __attribute__ ((__const__));
 #define svc_max_pollfd (*__rpc_thread_svc_max_pollfd ())
 
+extern bool_t xdr_accepted_reply (XDR *xdrs, struct accepted_reply *ar);
+extern bool_t xdr_rejected_reply (XDR *xdrs, struct rejected_reply *rr);
+
 __END_DECLS
 
 #endif /* rpc/rpc.h */

libc/inet/addr.c

@@ -122,9 +122,7 @@ libc_hidden_def(inet_addr)
 
 #define INET_NTOA_MAX_LEN	16	/* max 12 digits + 3 '.'s + 1 nul */
 
-extern char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN]);
-libc_hidden_proto(inet_ntoa_r)
-char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
+static char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
 {
 	in_addr_t addr = ntohl(in.s_addr);
 	int i;
@@ -143,7 +141,6 @@ char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
 
 	return p+1;
 }
-libc_hidden_def(inet_ntoa_r)
 
 libc_hidden_proto(inet_ntoa)
 char *inet_ntoa(struct in_addr in)

libc/inet/rpc/rexec.c

@@ -61,14 +61,13 @@ libc_hidden_proto(atoi)
 libc_hidden_proto(connect)
 libc_hidden_proto(accept)
 libc_hidden_proto(listen)
+libc_hidden_proto(ruserpass)
 
 #define SA_LEN(_x)      __libc_sa_len((_x)->sa_family)
 extern int __libc_sa_len (sa_family_t __af) __THROW attribute_hidden;
 
 int	rexecoptions;
 char	ahostbuf[NI_MAXHOST] attribute_hidden;
-extern int ruserpass(const char *host, const char **aname, const char **apass) attribute_hidden;
-libc_hidden_proto(ruserpass)
 
 libc_hidden_proto(rexec_af)
 int

libc/inet/rpc/rpc_prot.c

@@ -89,7 +89,6 @@ xdr_des_block (XDR *xdrs, des_block *blkp)
 /*
  * XDR the MSG_ACCEPTED part of a reply message union
  */
-extern bool_t xdr_accepted_reply (XDR *xdrs, struct accepted_reply *ar);
 libc_hidden_proto(xdr_accepted_reply)
 bool_t
 xdr_accepted_reply (XDR *xdrs, struct accepted_reply *ar)
@@ -117,7 +116,6 @@ libc_hidden_def(xdr_accepted_reply)
 /*
  * XDR the MSG_DENIED part of a reply message union
  */
-extern bool_t xdr_rejected_reply (XDR *xdrs, struct rejected_reply *rr);
 libc_hidden_proto(xdr_rejected_reply)
 bool_t
 xdr_rejected_reply (XDR *xdrs, struct rejected_reply *rr)

libc/inet/rpc/ruserpass.c

@@ -115,8 +115,8 @@ static const struct toktab {
 };
 
 
-
-extern int ruserpass(const char *host, const char **aname, const char **apass);
+/* ruserpass - remote password check.
+   This function also exists in glibc but is undocumented */
 libc_hidden_proto(ruserpass)
 int ruserpass(const char *host, const char **aname, const char **apass)
 {

libc/misc/time/time.c

@@ -202,8 +202,7 @@ libc_hidden_proto(__ctype_b)
     ((defined(L_strftime) || defined(L_strftime_l)) && \
     defined(__UCLIBC_HAS_XLOCALE__))
 
-void _time_tzset(int use_old_rules);
-libc_hidden_proto(_time_tzset)
+void _time_tzset(int use_old_rules) attribute_hidden;
 
 #ifndef L__time_mktime