Use fortify macros for b{zero,copy} along decl from strings.h

diff --git a/include/bits/strings_fortified.h b/include/bits/strings_fortified.h
new file mode 100644
index 0000000..77219c1
--- /dev/null
+++ b/include/bits/strings_fortified.h
@@ -0,0 +1 @@ 
+#include <string/bits/strings_fortified.h>
diff --git a/string/Makefile b/string/Makefile
index aaa371f..04e9da9 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -24,7 +24,8 @@  include ../Makeconfig
 
 headers	:= string.h strings.h memory.h endian.h bits/endian.h \
 	   argz.h envz.h byteswap.h bits/byteswap.h bits/byteswap-16.h \
-	   bits/string.h bits/string2.h bits/string3.h
+	   bits/string.h bits/string2.h bits/string3.h \
+	   bits/strings_fortified.h
 
 routines	:= strcat strchr strcmp strcoll strcpy strcspn		\
 		   strverscmp strdup strndup				\
diff --git a/string/bits/string3.h b/string/bits/string3.h
index fe0c161..0b0a377 100644
--- a/string/bits/string3.h
+++ b/string/bits/string3.h
@@ -91,26 +91,7 @@  __NTH (memset (void *__dest, int __ch, size_t __len))
 }
 
 #ifdef __USE_MISC
-__fortify_function void
-__NTH (bcopy (const void *__src, void *__dest, size_t __len))
-{
-  (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
-}
-
-__fortify_function void
-__NTH (bzero (void *__dest, size_t __len))
-{
-  (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
-}
-
-void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
-  __THROW __nonnull ((1));
-
-__fortify_function void
-__NTH (explicit_bzero (void *__dest, size_t __len))
-{
-  __explicit_bzero_chk (__dest, __len, __bos0 (__dest));
-}
+# include <bits/strings_fortified.h>
 #endif
 
 __fortify_function char *
diff --git a/string/bits/strings_fortified.h b/string/bits/strings_fortified.h
new file mode 100644
index 0000000..fd396f9
--- /dev/null
+++ b/string/bits/strings_fortified.h
@@ -0,0 +1,43 @@ 
+/* Fortify macros for strings.h functions.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __STRINGS_FORTIFIED
+# define __STRINGS_FORTIFIED 1
+
+__fortify_function void
+__NTH (bcopy (const void *__src, void *__dest, size_t __len))
+{
+  (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
+}
+
+__fortify_function void
+__NTH (bzero (void *__dest, size_t __len))
+{
+  (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
+}
+
+void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
+  __THROW __nonnull ((1));
+
+__fortify_function void
+__NTH (explicit_bzero (void *__dest, size_t __len))
+{
+  __explicit_bzero_chk (__dest, __len, __bos0 (__dest));
+}
+
+#endif
diff --git a/string/strings.h b/string/strings.h
index ece21c8..69b75b1 100644
--- a/string/strings.h
+++ b/string/strings.h
@@ -136,4 +136,12 @@  __END_DECLS
 
 #endif	/* string.h  */
 
+#if __GNUC_PREREQ (3,4) && __USE_FORTIFY_LEVEL > 0 \
+    && defined __fortify_function
+/* Functions with security checks.  */
+# if defined __USE_MISC || !defined __USE_XOPEN2K8
+#  include <bits/strings_fortified.h>
+# endif
+#endif
+
 #endif	/* strings.h  */