string: Add libc_hidden_proto for strchrnul

Although static linker can optimize it to local call, it follows the
internal scheme to provide hidden proto and definitions.

Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>

include/string.h

@@ -95,6 +95,7 @@ libc_hidden_proto (__rawmemchr)
 libc_hidden_proto (__strcasecmp)
 libc_hidden_proto (__strcasecmp_l)
 libc_hidden_proto (__strncasecmp_l)
+libc_hidden_proto (__strchrnul)
 extern __typeof (strncat) __strncat;
 libc_hidden_proto (__strncat)
 libc_hidden_proto (__strdup)

string/strchrnul.c

@@ -51,5 +51,6 @@ __strchrnul (const char *str, int c_in)
   return (char *) word_ptr + index_first_zero_eq (word, repeated_c);
 }
 #ifndef STRCHRNUL
+libc_hidden_def (__strchrnul)
 weak_alias (__strchrnul, strchrnul)
 #endif

sysdeps/aarch64/strchrnul.S

@@ -95,4 +95,5 @@ L(end):
 	ret
 
 END(__strchrnul)
+libc_hidden_def (__strchrnul)
 weak_alias (__strchrnul, strchrnul)

sysdeps/i386/strchrnul.S

@@ -273,4 +273,5 @@ L(6):	popl %edi		/* restore saved register content */
 	ret
 END (__strchrnul)
 
+libc_hidden_def (__strchrnul)
 weak_alias (__strchrnul, strchrnul)

sysdeps/m68k/strchrnul.S

@@ -263,4 +263,5 @@ L(L9:)
 	rts
 END(__strchrnul)
 
+libc_hidden_def (__strchrnul)
 weak_alias (__strchrnul, strchrnul)

sysdeps/powerpc/powerpc32/power4/multiarch/strchrnul-ppc32.c

@@ -22,3 +22,10 @@
 extern __typeof (strchrnul) __strchrnul_ppc attribute_hidden;
 
 #include <string/strchrnul.c>
+#undef __strchrnul
+weak_alias (__strchrnul_ppc, __strchrnul)
+#ifdef SHARED
+__hidden_ver1 (__strchrnul_ppc, __GI___strchrnul, __strchrnul_ppc);
+#else
+weak_alias (__strchrnul_ppc, strchrnul)
+#endif

sysdeps/powerpc/powerpc32/power4/multiarch/strchrnul.c

@@ -16,22 +16,23 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#if IS_IN (libc)
+#if defined SHARED && IS_IN (libc)
+# define __strchrnul __redirect___strchrnul
+# define strchrnul __redirect_strchrnul
 # include <string.h>
 # include <shlib-compat.h>
 # include "init-arch.h"
 
 extern __typeof (__strchrnul) __strchrnul_ppc attribute_hidden;
 extern __typeof (__strchrnul) __strchrnul_power7 attribute_hidden;
+# undef __strchrnul
+# undef strchrnul
 
 /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
    ifunc symbol properly.  */
-libc_ifunc (__strchrnul,
-	    (hwcap & PPC_FEATURE_HAS_VSX)
-            ? __strchrnul_power7
-            : __strchrnul_ppc);
-
+libc_ifunc_redirected (__redirect___strchrnul, __strchrnul,
+		       (hwcap & PPC_FEATURE_HAS_VSX)
+		       ? __strchrnul_power7
+		       : __strchrnul_ppc);
 weak_alias (__strchrnul, strchrnul)
-#else
-#include <string/strchrnul.c>
 #endif

sysdeps/powerpc/powerpc64/multiarch/strchrnul.c

@@ -35,6 +35,7 @@ libc_ifunc (__strchrnul,
             ? __strchrnul_power7
             : __strchrnul_ppc);
 
+libc_hidden_def (__strchrnul)
 weak_alias (__strchrnul, strchrnul)
 #else
 #include <string/strchrnul.c>

sysdeps/s390/strchrnul-c.c

@@ -21,8 +21,10 @@
 #if HAVE_STRCHRNUL_C
 # if HAVE_STRCHRNUL_IFUNC
 #  define STRCHRNUL STRCHRNUL_C
-#  define __strchrnul STRCHRNUL
 # endif
 
 # include <string/strchrnul.c>
+# if defined SHARED && IS_IN (libc)
+__hidden_ver1 (__strchrnul_c, __GI___strchrnul, __strchrnul_c);
+# endif
 #endif

sysdeps/s390/strchrnul.c

@@ -19,18 +19,20 @@
 #include <ifunc-strchrnul.h>
 
 #if HAVE_STRCHRNUL_IFUNC
+# define __strchrnul __redirect_strchrnul
 # include <string.h>
+# undef __strchrnul
 # include <ifunc-resolve.h>
 
 # if HAVE_STRCHRNUL_C
-extern __typeof (__strchrnul) STRCHRNUL_C attribute_hidden;
+extern __typeof (__redirect_strchrnul) STRCHRNUL_C attribute_hidden;
 # endif
 
 # if HAVE_STRCHRNUL_Z13
-extern __typeof (__strchrnul) STRCHRNUL_Z13 attribute_hidden;
+extern __typeof (__redirect_strchrnul) STRCHRNUL_Z13 attribute_hidden;
 # endif
 
-s390_libc_ifunc_expr (__strchrnul, __strchrnul,
+s390_libc_ifunc_expr (__redirect_strchrnul, __strchrnul,
 		      (HAVE_STRCHRNUL_Z13 && (hwcap & HWCAP_S390_VX))
 		      ? STRCHRNUL_Z13
 		      : STRCHRNUL_DEFAULT

sysdeps/x86_64/multiarch/strchrnul.c

@@ -31,4 +31,8 @@
 libc_ifunc_redirected (__redirect_strchrnul, __strchrnul,
 		       IFUNC_SELECTOR ());
 weak_alias (__strchrnul, strchrnul)
+# ifdef SHARED
+__hidden_ver1 (__strchrnul, __GI___strchrnul, __redirect_strchrnul)
+  __attribute__((visibility ("hidden"))) __attribute_copy__ (strchrnul);
+# endif
 #endif

sysdeps/x86_64/strchrnul.S

@@ -24,4 +24,5 @@
 
 #include "isa-default-impl.h"
 
+libc_hidden_def (__strchrnul)
 weak_alias (__strchrnul, strchrnul)