[PATCH v2] linux: Fix fstat64 on alpha and sparc64

[Adhemerval Zanella]

The 551101e8240b7514fc646d1722f8b79c90362b8f change is incorrect for
alpha and sparc, since __NR_stat is defined by both kABI.  Use
__NR_newfstat to check whether to fallback to __NR_fstat64 (similar
to what fstatat64 does).

Checked on sparc64-linux-gnu.
---
 sysdeps/unix/sysv/linux/fstat64.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/fstat64.c b/sysdeps/unix/sysv/linux/fstat64.c
index b4b5dc2908..cc9f695df9 100644
--- a/sysdeps/unix/sysv/linux/fstat64.c
+++ b/sysdeps/unix/sysv/linux/fstat64.c
@@ -30,7 +30,10 @@ __fstat64_time64 (int fd, struct __stat64_t64 *buf)
 {
 #if !FSTATAT_USE_STATX
 # if XSTAT_IS_XSTAT64
-#  ifdef __NR_fstat
+  /* The __NR_stat macro is defined for all ABIs that also define 
+     XSTAT_IS_STAT64, so to correctly identify alpha and sparc check
+     __NR_newfstatat (similar to what fstatat64 does).  */
+#  ifdef __NR_newfstatat
   /* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
      x86_64.  */
   return INLINE_SYSCALL_CALL (fstat, fd, buf);
-- 
2.34.1