[glibc] string: Add hidden builtin definition for __strcpy_chk.

[Stefan Liebler <stli@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fa3eb7d5e7d32ca1ad48b48a7eb6d15b8382c3a7

commit fa3eb7d5e7d32ca1ad48b48a7eb6d15b8382c3a7
Author: Stefan Liebler <stli@linux.ibm.com>
Date:   Mon Feb 5 14:22:06 2024 +0100

    string: Add hidden builtin definition for __strcpy_chk.
    
    Otherwise on at least x86_64 and s390x there is an unwanted PLT entry
    in libc.so when configured with --enable-fortify-source=3 and build
    with -Os.
    
    This is observed in elf/check-localplt
    Extra PLT reference: libc.so: __strcpy_chk
    
    The call to PLT entry is in inet/ruserpass.c.
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 debug/strcpy_chk.c | 1 +
 include/string.h   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/debug/strcpy_chk.c b/debug/strcpy_chk.c
index e54780ddde..dd2c453417 100644
--- a/debug/strcpy_chk.c
+++ b/debug/strcpy_chk.c
@@ -31,3 +31,4 @@ __strcpy_chk (char *dest, const char *src, size_t destlen)
 
   return memcpy (dest, src, len + 1);
 }
+libc_hidden_builtin_def (__strcpy_chk)
diff --git a/include/string.h b/include/string.h
index 86d1fa4abe..3b4c6007d7 100644
--- a/include/string.h
+++ b/include/string.h
@@ -215,6 +215,7 @@ libc_hidden_builtin_proto (__mempcpy_chk)
 libc_hidden_builtin_proto (__memset_chk)
 libc_hidden_builtin_proto (__stpcpy_chk)
 libc_hidden_builtin_proto (__strncpy_chk)
+libc_hidden_builtin_proto (__strcpy_chk)
 
 #endif