[glibc/azanella/clang] string: Use asm alias instead of symbol redirections for stpcpy and mempcpy

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=340ad390eb56d88ca54ae56bc7362505197128b6

commit 340ad390eb56d88ca54ae56bc7362505197128b6
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Mar 15 08:41:43 2022 -0300

    string: Use asm alias instead of symbol redirections for stpcpy and mempcpy
    
    Commit 939da411433 added symbols redirections to handle ISO C
    namespace, however clang do not support to redeclare the function
    prototype.
    
    This patch replaces the symbol redirections by direct asm aliases, as
    done to handle libcall generation done by compiler on some loop
    optimizations.
    
    Checked on all affected ABIs.

Diff:
---
 include/string.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/string.h b/include/string.h
index c26ca0927c..2ea212a401 100644
--- a/include/string.h
+++ b/include/string.h
@@ -188,8 +188,8 @@ extern __typeof (strsep) strsep attribute_hidden;
   && !defined NO_MEMPCPY_STPCPY_REDIRECT
 /* Redirect calls to __builtin_mempcpy and __builtin_stpcpy to call
    __mempcpy and __stpcpy if not inlined.  */
-extern __typeof (mempcpy) mempcpy __asm__ ("__mempcpy");
-extern __typeof (stpcpy) stpcpy __asm__ ("__stpcpy");
+__asm__ ("mempcpy = __mempcpy");
+__asm__ ("stpcpy = __stpcpy");
 #endif
 
 extern void *__memcpy_chk (void *__restrict __dest,