[PATCH v2 14/28] string: Use asm alias instead of symbol redirections for stpcpy and mempcpy

[H.J. Lu]

On Wed, Oct 29, 2025 at 1:12 AM Adhemerval Zanella
<adhemerval.zanella@linaro.org> wrote:
>
> 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.
> ---
>  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,
> --
> 2.43.0
>

Can it be moved to symbol-hacks.h?

-- 
H.J.