Mark internal functions with attribute_hidden [BZ #18822]

Mark internal functions with attribute_hidden to allow direct access to
internal functions within libc.so and libc.a without using GOT nor PLT.

Size comparison of libc.so:

On x86-64:
        text	   data	    bss	    dec	    hex
Before: 1728577	  20584	  17088	1766249	 1af369
After : 1728593	  20584	  17088	1766265	 1af379

The only change is __gconv_release_shlib in iconv/gconv_dl.c is inlined
since it is hidden, which increases the code size of gconv_dl.os by 18
bytes.

On i686:
        text	   data	    bss	    dec	    hex
Before: 1869039	  11444	  11112	1891595	 1cdd0b
After : 1868635	  11444	  11112	1891191	 1cdb77

The code size is decreased by avoiding GOT/PLT for hidden functions.

	[BZ #18822]
	* iconv/gconv_int.h (__gconv_open): Add attribute_hidden.
	(__gconv_close): Likewise.
	(__gconv): Likewise.
	(__gconv_find_transform): Likewise.
	(__gconv_lookup_cache): Likewise.
	(__gconv_compare_alias_cache): Likewise.
	(__gconv_load_cache): Likewise.
	(__gconv_get_path): Likewise.
	(__gconv_close_transform): Likewise.
	(__gconv_release_cache): Likewise.
	(__gconv_find_shlib): Likewise.
	(__gconv_release_shlib): Likewise.
	(__gconv_get_builtin_trans): Likewise.
	(__gconv_compare_alias): Likewise.
	* include/dlfcn.h (_dlerror_run): Likewise.
	* include/stdio.h (__fortify_fail_abort): Likewise.
	* include/time.h (__tz_compute): Likewise.
	(__strptime_internal): Likewise.
	* intl/gettextP.h (_nl_find_domain): Likewise.
	(_nl_load_domain): Likewise.
	(_nl_find_msg): Likewise.
	* intl/plural-exp.h (FREE_EXPRESSION): Likewise.
	(EXTRACT_PLURAL_EXPRESSION): Likewise.
	* locale/coll-lookup.h (__collidx_table_lookup): Likewise.
	* resolv/gai_misc.h (__gai_enqueue_request): Likewise.
	(__gai_find_request): Likewise.
	(__gai_remove_request): Likewise.
	(__gai_notify): Likewise.
	(__gai_notify_only): Likewise.
	* sysdeps/generic/aio_misc.h (__aio_sigqueue): Likewise.
	* sysdeps/generic/ldsodefs.h (_dl_fini): Likewise.
	(_dl_non_dynamic_init): Likewise.
	(_dl_aux_init): Likewise.
	* sysdeps/i386/machine-gmon.h (mcount_internal): Likewise.
	* sysdeps/unix/sysv/linux/i386/olddirent.h (__old_getdents64):
	Likewise.
	* wcsmbs/wcsmbsload.h (__wcsmbs_load_conv): Likewise.
	(__wcsmbs_clone_conv): Likewise.
	(__wcsmbs_named_conv): Likewise.

2 files changed, 11 insertions, 6 deletions

diff --git a/intl/gettextP.h b/intl/gettextP.h
index 8fcfb5bef8..75b203ab52 100644
--- a/intl/gettextP.h
+++ b/intl/gettextP.h
@@ -251,19 +251,23 @@ extern const char *_nl_locale_name_default (void);
 
 struct loaded_l10nfile *_nl_find_domain (const char *__dirname, char *__locale,
 					 const char *__domainname,
-					 struct binding *__domainbinding);
+					 struct binding *__domainbinding)
+     attribute_hidden;
 void _nl_load_domain (struct loaded_l10nfile *__domain,
-		      struct binding *__domainbinding);
+		      struct binding *__domainbinding)
+     attribute_hidden;
 
 #ifdef IN_LIBGLOCALE
 char *_nl_find_msg (struct loaded_l10nfile *domain_file,
 		    struct binding *domainbinding, const char *encoding,
 		    const char *msgid,
-		    size_t *lengthp);
+		    size_t *lengthp)
+     attribute_hidden;
 #else
 char *_nl_find_msg (struct loaded_l10nfile *domain_file,
 		    struct binding *domainbinding, const char *msgid,
-		    int convert, size_t *lengthp);
+		    int convert, size_t *lengthp)
+     attribute_hidden;
 #endif
 
 /* The internal variables in the standalone libintl.a must have different
diff --git a/intl/plural-exp.h b/intl/plural-exp.h
index 4833fcdf35..a4ffff9f91 100644
--- a/intl/plural-exp.h
+++ b/intl/plural-exp.h
@@ -101,12 +101,13 @@ struct parse_args
 # define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
 #endif
 
-extern void FREE_EXPRESSION (struct expression *exp);
+extern void FREE_EXPRESSION (struct expression *exp) attribute_hidden;
 extern int PLURAL_PARSE (struct parse_args *arg);
 extern const struct expression GERMANIC_PLURAL attribute_hidden;
 extern void EXTRACT_PLURAL_EXPRESSION (const char *nullentry,
 				       const struct expression **pluralp,
-				       unsigned long int *npluralsp);
+				       unsigned long int *npluralsp)
+     attribute_hidden;
 
 #if !defined (_LIBC) && !defined (IN_LIBINTL) && !defined (IN_LIBGLOCALE)
 extern unsigned long int plural_eval (const struct expression *pexp,