wchar: Avoid PLT entries with _FORTIFY_SOURCE

The change is meant to avoid unwanted PLT entries for the wmemset and
wcrtomb routines when _FORTIFY_SOURCE is set.

On top of that, ensure that *_chk routines have their hidden builtin
definitions available.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

debug/wcrtomb_chk.c

@@ -28,3 +28,4 @@ __wcrtomb_chk (char *s, wchar_t wchar, mbstate_t *ps, size_t buflen)
 {
   return __wcrtomb_internal (s, wchar, ps, buflen);
 }
+libc_hidden_def (__wcrtomb_chk)

debug/wmemset_chk.c

@@ -26,3 +26,4 @@ __wmemset_chk (wchar_t *s, wchar_t c, size_t n, size_t dstlen)
 
   return wmemset (s, c, n);
 }
+libc_hidden_builtin_def (__wmemset_chk)

include/wchar.h

@@ -166,6 +166,8 @@ libc_hidden_proto (putwc)
 
 libc_hidden_proto (mbrtowc)
 libc_hidden_proto (wcrtomb)
+libc_hidden_proto (__wcrtomb_chk)
+
 extern int __wcscmp (const wchar_t *__s1, const wchar_t *__s2)
      __THROW __attribute_pure__;
 libc_hidden_proto (__wcscmp)
@@ -260,16 +262,25 @@ extern wchar_t *__wcschrnul (const wchar_t *__s, wchar_t __wc)
 
 extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
 			       size_t __ns) __THROW;
+libc_hidden_builtin_proto (__wmemset_chk)
 
 extern int __vfwscanf (__FILE *__restrict __s,
 		       const wchar_t *__restrict __format,
 		       __gnuc_va_list __arg)
      attribute_hidden
      /* __attribute__ ((__format__ (__wscanf__, 2, 0)) */;
+
+extern int __swprintf_chk (wchar_t *__restrict __s, size_t __n,
+			   int __flag, size_t __s_len,
+			   const wchar_t *__restrict __format, ...)
+     __THROW /* __attribute__ ((__format__ (__wprintf__, 5, 6))) */;
+
 extern int __fwprintf (__FILE *__restrict __s,
 		       const wchar_t *__restrict __format, ...)
      attribute_hidden
      /* __attribute__ ((__format__ (__wprintf__, 2, 3))) */;
+extern int __wprintf_chk (int __flag, const wchar_t *__restrict __format,
+			  ...);
 extern int __vfwprintf_chk (FILE *__restrict __s, int __flag,
 			    const wchar_t *__restrict __format,
 			    __gnuc_va_list __arg)
@@ -279,6 +290,10 @@ extern int __vswprintf_chk (wchar_t *__restrict __s, size_t __n,
 			    const wchar_t *__restrict __format,
 			    __gnuc_va_list __arg)
      /* __attribute__ ((__format__ (__wprintf__, 5, 0))) */;
+extern int __fwprintf_chk (__FILE *__restrict __stream, int __flag,
+			   const wchar_t *__restrict __format, ...);
+extern int __vwprintf_chk (int __flag, const wchar_t *__restrict __format,
+			   __gnuc_va_list __ap);
 
 extern int __isoc99_fwscanf (__FILE *__restrict __stream,
 			     const wchar_t *__restrict __format, ...);

sysdeps/x86_64/multiarch/wmemset_chk.c

@@ -28,4 +28,8 @@
 
 libc_ifunc_redirected (__redirect_wmemset_chk, __wmemset_chk,
 		       IFUNC_SELECTOR ());
+# ifdef SHARED
+__hidden_ver1 (__wmemset_chk, __GI___wmemset_chk, __redirect_wmemset_chk)
+  __attribute__ ((visibility ("hidden"))) __attribute_copy__ (__wmemset_chk);
+# endif
 #endif

wcsmbs/bits/wchar2-decl.h

@@ -71,7 +71,7 @@ extern wchar_t *__REDIRECT_NTH (__wmempcpy_chk_warn,
 
 extern wchar_t *__wmemset_chk (wchar_t *__s, wchar_t __c, size_t __n,
 			       size_t __ns) __THROW;
-extern wchar_t *__REDIRECT_NTH (__wmemset_alias, (wchar_t *__s, wchar_t __c,
+extern wchar_t *__REDIRECT_FORTIFY_NTH (__wmemset_alias, (wchar_t *__s, wchar_t __c,
 							  size_t __n), wmemset);
 extern wchar_t *__REDIRECT_NTH (__wmemset_chk_warn,
 				(wchar_t *__s, wchar_t __c, size_t __n,
@@ -203,7 +203,7 @@ extern wchar_t *__REDIRECT (__fgetws_unlocked_chk_warn,
 extern size_t __wcrtomb_chk (char *__restrict __s, wchar_t __wchar,
 			     mbstate_t *__restrict __p,
 			     size_t __buflen) __THROW __wur;
-extern size_t __REDIRECT_NTH (__wcrtomb_alias,
+extern size_t __REDIRECT_FORTIFY_NTH (__wcrtomb_alias,
 				      (char *__restrict __s, wchar_t __wchar,
 				      mbstate_t *__restrict __ps), wcrtomb) __wur;