[glibc/release/2.36/master] x86: Fix -Os build (BZ #29576)

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c

commit 4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c
Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Date:   Wed Sep 21 10:51:08 2022 -0300

    x86: Fix -Os build (BZ #29576)
    
    The compiler might transform __stpcpy calls (which are routed to
    __builtin_stpcpy as an optimization) to strcpy and x86_64 strcpy
    multiarch implementation does not build any working symbol due
    ISA_SHOULD_BUILD not being evaluated for IS_IN(rtld).
    
    Checked on x86_64-linux-gnu.
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    Tested-by: Carlos O'Donell <carlos@redhat.com>
    
    (cherry picked from commit 9dc4e29f630c6ef8299120b275e503321dc0c8c7)

Diff:
---
 NEWS                                   |  2 ++
 sysdeps/x86_64/multiarch/rtld-strcpy.S | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/NEWS b/NEWS
index c3df0c007d..fb2d73a6be 100644
--- a/NEWS
+++ b/NEWS
@@ -39,6 +39,8 @@ The following bugs are resolved with this release:
   [29528] elf: Call __libc_early_init for reused namespaces
   [29537] libc: [2.34 regression]: Alignment issue on m68k when using
   [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
+  [29576] build: librtld.os: in function `_dl_start_profile':
+    (.text+0x9444): undefined reference to `strcpy'
   [29583] Use 64-bit interfaces in gconv_parseconfdir
   [29600] Do not completely clear reused namespace in dlmopen
   [29607] nscd repeatably crashes calling __strlen_avx2 when hosts cache is
diff --git a/sysdeps/x86_64/multiarch/rtld-strcpy.S b/sysdeps/x86_64/multiarch/rtld-strcpy.S
new file mode 100644
index 0000000000..19439c553d
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/rtld-strcpy.S
@@ -0,0 +1,18 @@
+/* Copyright (C) 2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include "../strcpy.S"