[glibc] x86: Fix -Os build (BZ #29576)

[glibc] x86: Fix -Os build (BZ #29576)

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9dc4e29f630c6ef8299120b275e503321dc0c8c7

commit 9dc4e29f630c6ef8299120b275e503321dc0c8c7
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>

Diff:
---
 sysdeps/x86_64/multiarch/rtld-strcpy.S | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

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"