[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=51a9a82dc0b4502276aac64b1a7a50f25fbba468

commit 51a9a82dc0b4502276aac64b1a7a50f25fbba468
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 b9c41b0eea..da61aa3b66 100644
--- a/include/string.h
+++ b/include/string.h
@@ -179,8 +179,8 @@ 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,