[PATCH] riscv: Keep __memcmpeq alias with RVV memcmp

[Zihong Yao]

Commit 2efc702628 replaces the generic RISC-V memcmp, which also exports
__memcmpeq.

A dedicated RISC-V __memcmpeq implementation is expected in a later patch,
which is still under review. Keep the alias here so this patch does not
temporarily drop the existing __memcmpeq ABI.

Tested on a Muse-Pi board with GCC 15.2.0 using `--with-arch=rv64g_zca_zcd --with-abi=lp64d`
and `CFLAGS="-march=rv64g_zca_zcd -mabi=lp64d -O2"`. Full make check was
run for both multiarch and non-multiarch builds.
This also fixes the string/inl-tester link failure caused by the missing
__memcmpeq symbol.

In both runs, the only FAILs are the unchanged cospi/sinpi/tanpi math test
failures.

Signed-off-by: Zihong Yao <zihong.plct@isrc.iscas.ac.cn>
---
 sysdeps/unix/sysv/linux/riscv/multiarch/memcmp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/riscv/multiarch/memcmp.c b/sysdeps/unix/sysv/linux/riscv/multiarch/memcmp.c
index 20e7b046ab..166df04d55 100644
--- a/sysdeps/unix/sysv/linux/riscv/multiarch/memcmp.c
+++ b/sysdeps/unix/sysv/linux/riscv/multiarch/memcmp.c
@@ -51,6 +51,10 @@ riscv_libc_ifunc (__libc_memcmp, select_memcmp_ifunc);
 # undef bcmp
 strong_alias (__libc_memcmp, memcmp);
 weak_alias (memcmp, bcmp);
+
+# undef __memcmpeq
+strong_alias (__libc_memcmp, __memcmpeq);
+libc_hidden_def (__memcmpeq);
 # ifdef SHARED
 __hidden_ver1 (memcmp, __GI_memcmp, __redirect_memcmp)
   __attribute__ ((visibility ("hidden"))) __attribute_copy__ (memcmp);
-- 
2.53.0