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Re: [PATCH v5 00/14] port C-SKY to glibc


On Mon, Nov 19, 2018 at 04:45:09PM +0000, Joseph Myers wrote:
> As far as I can tell, in the current version of the gcc_AC_INITFINI_ARRAY
> test, the only part that's an execution test is the ia64 case.  That is,
> for every other target, the 'if test "x${build}" = "x${target}" && test
> "x${build}" = "x${host}"' condition is bogus as the rest of the tests
> would work just as well for cross compilation.  (In the ia64 case, the
> fourth argument to AC_RUN_IFELSE - the action if cross compiling - is
> already there.  So simply removing the requirement for build = host =
> target should allow things to work for cross compiling as well as for
> native except on ia64, and someone using ia64 could always fix that case
> later to have better cross compilation defaults based on the target OS.)
>

We'v tried to remove this condition, but seems doesn't meet our expectation.
The ia64 case seems only get a test need to run on the target, return -1 when
init_array is not support. I didn't found any AC_RUN_IFELSE in current gcc 9.0
gcc/configure. The *) case seems can return gcc_cv_initfini_array=yes
on C-SKY target, but it only check whether tools can generate init_array
section, not libc use init_array or not.

On Fri, Nov 23, 2018 at 05:11:35PM +0000, Joseph Myers wrote:
> Since the way in which those platforms avoid using the files in question 
> is through having their own sysdeps override files that either contain 
> just comments or reimplement the functions in question, my suggestion 
> would be to have statx_cp.c files in sysdeps/unix/sysv/linux/wordsize-64 
> and sysdeps/unix/sysv/linux/mips/mips64, containing just a comment.  Then 
> the conditional in the main statx_cp.c file would be

Thanks for suggestion.
I'v tried to add statx_cp.c under sysdeps/unix/sysv/linux/mips/mips64, and
something got wrong while glibc is configured for mips:

PASS: compilers-mips64-linux-gnu-soft glibc mips64-linux-gnu-n64-soft copy
*** Error in `/home/vmh/disk2/buildmany/install/compilers/mips64-linux-gnu-soft/lib/gcc/mips64-glibc-linux-gnu/9.0.0/../../../../mips64-glibc-linux-gnu/bin/ld': free(): invalid next size (fast): 0x000000000250c100 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f45a2d417e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f45a2d4a37a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f45a2d4e53c]
/home/vmh/disk2/buildmany/install/compilers/mips64-linux-gnu-soft/lib/gcc/mips64-glibc-linux-gnu/9.0.0/../../../../mips64-glibc-linux-gnu/bin/ld[0x4440c0]
/home/vmh/disk2/buildmany/install/compilers/mips64-linux-gnu-soft/lib/gcc/mips64-glibc-linux-gnu/9.0.0/../../../../mips64-glibc-linux-gnu/bin/ld[0x4926bf]
/home/vmh/disk2/buildmany/install/compilers/mips64-linux-gnu-soft/lib/gcc/mips64-glibc-linux-gnu/9.0.0/../../../../mips64-glibc-linux-gnu/bin/ld[0x467c22]
...
PASS: compilers-mips64-linux-gnu-nan2008-soft glibc mips64-linux-gnu-n64-nan2008-soft configure

The final result is PASS. I haven't found the rootcause yet.

> It's probably a bad idea to duplicate the logic for such overflow checks - 
> rather, the existing stat_overflow code should be used.  Maybe eliminate 
> __cp_stat_statx, make the callers cast to (struct stat64 *) and call 
> __cp_stat64_statx and then use stat_overflow in the callers?  (As all the 
> cases needing this check are in generic/wordsize-32, we know that the stat 
> and stat64 layouts are the same, just differing in whether or not high 
> parts are counted as padding.  Because statx_cp.c is in a separate 
> translation unit and glibc uses C with ABI boundaries, doing the cast in a 
> caller like that is safe, whereas defining __cp_stat_statx to do such a 
> cast, call and then check with stat_overflow, in the same translation unit 
> as the __cp_stat64_statx definition, could run into aliasing issues.)

I used __cp_stat_statx in the last patch, the high part will cut off when
assign a 64bit variable to a 32bit one. The padding seems will never become
non-zero, so I didn't use stat_overflow in last patch. In order to return
whether st_ino, st_size, st_blocks are overflowed, the high part should
be keeped or some check is needed on statx result? So make the callers
cast to (struct stat64 *) and call __cp_stat64_statx will make the funcion
behavior exactly same as the old one?

Best Regards,
Mao Han 
>From 9bb30a741a5665296997235ed89ced51a23e9048 Mon Sep 17 00:00:00 2001
Message-Id: <9bb30a741a5665296997235ed89ced51a23e9048.1543216869.git.han_mao@c-sky.com>
From: Mao Han <han_mao@c-sky.com>
Date: Mon, 26 Nov 2018 11:13:32 +0800
Subject: [PATCH v3 1/1] Add statx conditionals for wordsize-32 *xstat.c

Linux kernel have remove stat64 family from default syscall set, new
implementations with statx is needed when __ARCH_WANT_STAT64 is not
define. This patch add conditionals for relevant functions, using statx
system call to get information and then copy to the return buf, ref to
include/linux/fs.h from linux kernel.

	* sysdeps/unix/sysv/linux/Makefile: Add statx_cp.c.
	* sysdeps/unix/sysv/linux/fxstat64.c: Add conditionals for kernel
	without stat64 system call support.
	* sysdeps/unix/sysv/linux/fxstatat64.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/fxstat.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/fxstatat.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat64.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/statx_cp.c: New file.
	* sysdeps/unix/sysv/linux/statx_cp.c: Likewise.
	* sysdeps/unix/sysv/linux/statx_cp.h: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/statx_cp.c: Likewise.
---
 sysdeps/unix/sysv/linux/Makefile                   |  3 +-
 sysdeps/unix/sysv/linux/fxstat64.c                 | 12 +++++-
 sysdeps/unix/sysv/linux/fxstatat64.c               | 11 +++++
 .../unix/sysv/linux/generic/wordsize-32/fxstat.c   | 11 +++++
 .../unix/sysv/linux/generic/wordsize-32/fxstatat.c | 11 +++++
 .../unix/sysv/linux/generic/wordsize-32/lxstat.c   | 11 +++++
 .../unix/sysv/linux/generic/wordsize-32/lxstat64.c | 19 ++++++++-
 .../unix/sysv/linux/generic/wordsize-32/xstat.c    | 10 +++++
 .../unix/sysv/linux/generic/wordsize-32/xstat64.c  | 14 ++++++-
 sysdeps/unix/sysv/linux/mips/mips64/statx_cp.c     |  3 ++
 sysdeps/unix/sysv/linux/statx_cp.c                 | 49 ++++++++++++++++++++++
 sysdeps/unix/sysv/linux/statx_cp.h                 | 23 ++++++++++
 sysdeps/unix/sysv/linux/wordsize-64/statx_cp.c     |  3 ++
 13 files changed, 175 insertions(+), 5 deletions(-)
 create mode 100644 sysdeps/unix/sysv/linux/mips/mips64/statx_cp.c
 create mode 100644 sysdeps/unix/sysv/linux/statx_cp.c
 create mode 100644 sysdeps/unix/sysv/linux/statx_cp.h
 create mode 100644 sysdeps/unix/sysv/linux/wordsize-64/statx_cp.c

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 72b6b64..2943a10 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -177,7 +177,8 @@ sysdep_routines += xstatconv internal_statvfs internal_statvfs64 \
 		   close_nocancel fcntl_nocancel nanosleep_nocancel \
 		   open_nocancel open64_nocancel \
 		   openat_nocancel openat64_nocancel \
-		   pause_nocancel read_nocancel waitpid_nocancel write_nocancel
+		   pause_nocancel read_nocancel waitpid_nocancel \
+		   write_nocancel statx_cp
 
 sysdep_headers += bits/fcntl-linux.h
 
diff --git a/sysdeps/unix/sysv/linux/fxstat64.c b/sysdeps/unix/sysv/linux/fxstat64.c
index 0d05389..b0c5271 100644
--- a/sysdeps/unix/sysv/linux/fxstat64.c
+++ b/sysdeps/unix/sysv/linux/fxstat64.c
@@ -1,4 +1,4 @@
-/* fxstat64 using Linux fstat64 system call.
+/* fxstat64 using Linux fstat64/statx system call.
    Copyright (C) 1997-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <stddef.h>
+#include <fcntl.h>
 #include <sys/stat.h>
 #include <kernel_stat.h>
 
@@ -25,6 +26,7 @@
 #include <sys/syscall.h>
 
 #include <kernel-features.h>
+#include <statx_cp.h>
 
 /* Get information about the file FD in BUF.  */
 
@@ -32,7 +34,15 @@ int
 ___fxstat64 (int vers, int fd, struct stat64 *buf)
 {
   int result;
+#ifdef __NR_fstat64
   result = INLINE_SYSCALL (fstat64, 2, fd, buf);
+#else
+  struct statx tmp;
+  result = INLINE_SYSCALL (statx, 5, fd, "", AT_EMPTY_PATH, STATX_BASIC_STATS,
+                           &tmp);
+  if (result == 0)
+    __cp_stat64_statx (buf, &tmp);
+#endif
 #if defined _HAVE_STAT64___ST_INO && !__ASSUME_ST_INO_64_BIT
   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
     buf->st_ino = buf->__st_ino;
diff --git a/sysdeps/unix/sysv/linux/fxstatat64.c b/sysdeps/unix/sysv/linux/fxstatat64.c
index baa9a60..767d55c 100644
--- a/sysdeps/unix/sysv/linux/fxstatat64.c
+++ b/sysdeps/unix/sysv/linux/fxstatat64.c
@@ -26,6 +26,8 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
+#include <statx_cp.h>
+
 /* Get information about the file NAME in BUF.  */
 
 int
@@ -37,7 +39,16 @@ __fxstatat64 (int vers, int fd, const char *file, struct stat64 *st, int flag)
   int result;
   INTERNAL_SYSCALL_DECL (err);
 
+#ifdef __NR_fstatat64
   result = INTERNAL_SYSCALL (fstatat64, err, 4, fd, file, st, flag);
+#else
+  struct statx tmp;
+
+  result = INTERNAL_SYSCALL (statx, err, 5, fd, file, AT_NO_AUTOMOUNT | flag,
+                             STATX_BASIC_STATS, &tmp);
+  if (result == 0)
+    __cp_stat64_statx (st, &tmp);
+#endif
   if (!__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1))
     return 0;
   else
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstat.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstat.c
index b5c766d..654c5e0 100644
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstat.c
+++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstat.c
@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <stddef.h>
+#include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <kernel_stat.h>
@@ -27,6 +28,7 @@
 
 #if !XSTAT_IS_XSTAT64
 #include "overflow.h"
+#include <statx_cp.h>
 
 /* Get information about the file FD in BUF.  */
 int
@@ -34,8 +36,17 @@ __fxstat (int vers, int fd, struct stat *buf)
 {
   if (vers == _STAT_VER_KERNEL)
     {
+# ifdef __NR_fstat64
       int rc = INLINE_SYSCALL (fstat64, 2, fd, buf);
       return rc ?: stat_overflow (buf);
+# else
+      struct statx tmp;
+      int rc = INLINE_SYSCALL (statx, 5, fd, "", AT_EMPTY_PATH,
+                               STATX_BASIC_STATS, &tmp);
+      if (rc == 0)
+        __cp_stat64_statx ((struct stat64 *)buf, &tmp);
+      return rc ?: stat_overflow (buf);
+# endif
     }
 
   errno = EINVAL;
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstatat.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstatat.c
index 0bda8f7..1b385cc 100644
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstatat.c
+++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/fxstatat.c
@@ -28,6 +28,7 @@
 
 #if !XSTAT_IS_XSTAT64
 #include "overflow.h"
+#include <statx_cp.h>
 
 /* Get information about the file NAME in BUF.  */
 int
@@ -35,8 +36,18 @@ __fxstatat (int vers, int fd, const char *file, struct stat *buf, int flag)
 {
   if (vers == _STAT_VER_KERNEL)
     {
+# ifdef __NR_fstatat64
       int rc = INLINE_SYSCALL (fstatat64, 4, fd, file, buf, flag);
       return rc ?: stat_overflow (buf);
+# else
+      struct statx tmp;
+      int rc = INLINE_SYSCALL (statx, 5, fd, file,
+                               AT_NO_AUTOMOUNT | flag,
+                               STATX_BASIC_STATS, &tmp);
+      if (rc == 0)
+        __cp_stat64_statx ((struct stat64 *)buf, &tmp);
+      return rc ?: stat_overflow (buf);
+# endif
     }
 
   errno = EINVAL;
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat.c
index c278a4d..d6c8824 100644
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat.c
+++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat.c
@@ -27,6 +27,7 @@
 
 #if !XSTAT_IS_XSTAT64
 #include "overflow.h"
+#include <statx_cp.h>
 
 /* Get information about the file NAME in BUF.  */
 int
@@ -34,9 +35,19 @@ __lxstat (int vers, const char *name, struct stat *buf)
 {
   if (vers == _STAT_VER_KERNEL)
     {
+#ifdef __NR_fstatat64
       int rc = INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf,
                                AT_SYMLINK_NOFOLLOW);
       return rc ?: stat_overflow (buf);
+#else
+      struct statx tmp;
+      int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name,
+                               AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW,
+                               STATX_BASIC_STATS, &tmp);
+      if (rc == 0)
+        __cp_stat64_statx ((struct stat64 *)buf, &tmp);
+      return rc ?: stat_overflow (buf);
+#endif
     }
   errno = EINVAL;
   return -1;
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat64.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat64.c
index 761dd16..86b7a98 100644
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat64.c
+++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/lxstat64.c
@@ -32,13 +32,28 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
+#include <statx_cp.h>
+
 /* Get information about the file NAME in BUF.  */
 int
 __lxstat64 (int vers, const char *name, struct stat64 *buf)
 {
   if (vers == _STAT_VER_KERNEL)
-    return INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf,
-                           AT_SYMLINK_NOFOLLOW);
+    {
+#ifdef __NR_fstatat64
+      return INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf,
+                             AT_SYMLINK_NOFOLLOW);
+#else
+      struct statx tmp;
+      int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name,
+                               AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW,
+                               STATX_BASIC_STATS, &tmp);
+      if (rc == 0)
+        __cp_stat64_statx (buf, &tmp);
+      return rc;
+#endif
+    }
+
   errno = EINVAL;
   return -1;
 }
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c
index 1fd57ff..753f91e 100644
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c
+++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c
@@ -27,6 +27,7 @@
 
 #if !XSTAT_IS_XSTAT64
 #include "overflow.h"
+#include <statx_cp.h>
 
 /* Get information about the file NAME in BUF.  */
 int
@@ -34,8 +35,17 @@ __xstat (int vers, const char *name, struct stat *buf)
 {
   if (vers == _STAT_VER_KERNEL)
     {
+# ifdef __NR_fstatat64
       int rc = INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf, 0);
       return rc ?: stat_overflow (buf);
+# else
+      struct statx tmp;
+      int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name, AT_NO_AUTOMOUNT,
+                               STATX_BASIC_STATS, &tmp);
+      if (rc == 0)
+        __cp_stat64_statx ((struct stat64 *)buf, &tmp);
+      return rc ?: stat_overflow (buf);
+# endif
     }
 
   errno = EINVAL;
diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c b/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c
index ae70495..8b38926 100644
--- a/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c
+++ b/sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c
@@ -32,13 +32,25 @@
 #include <sysdep.h>
 #include <sys/syscall.h>
 
+#include <statx_cp.h>
+
 /* Get information about the file NAME in BUF.  */
 int
 __xstat64 (int vers, const char *name, struct stat64 *buf)
 {
   if (vers == _STAT_VER_KERNEL)
+    {
+#ifdef __NR_fstatat64
     return INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf, 0);
-
+#else
+      struct statx tmp;
+      int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name, AT_NO_AUTOMOUNT,
+                               STATX_BASIC_STATS, &tmp);
+      if (rc == 0)
+        __cp_stat64_statx (buf, &tmp);
+      return rc;
+#endif
+    }
   errno = EINVAL;
   return -1;
 }
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/statx_cp.c b/sysdeps/unix/sysv/linux/mips/mips64/statx_cp.c
new file mode 100644
index 0000000..260cda9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mips/mips64/statx_cp.c
@@ -0,0 +1,3 @@
+/* Override the generic statx_cp.c which is only needed for new 32-bit arch
+   without stat64 family support.
+ */
diff --git a/sysdeps/unix/sysv/linux/statx_cp.c b/sysdeps/unix/sysv/linux/statx_cp.c
new file mode 100644
index 0000000..04a13fa
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/statx_cp.c
@@ -0,0 +1,49 @@
+/* Struct statx to stat/stat64 conversion for Linux.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include <statx_cp.h>
+
+#if !defined(__NR_fstat64) || !defined(__NR_fstatat64)
+void
+__cp_stat64_statx (struct stat64 *to, struct statx *from)
+{
+  memset (to, 0, sizeof (struct stat64));
+  to->st_dev = ((from->stx_dev_minor & 0xff) | (from->stx_dev_major << 8)
+		| ((from->stx_dev_minor & ~0xff) << 12));
+  to->st_rdev = ((from->stx_rdev_minor & 0xff) | (from->stx_rdev_major << 8)
+		 | ((from->stx_rdev_minor & ~0xff) << 12));
+  to->st_ino = from->stx_ino;
+  to->st_mode = from->stx_mode;
+  to->st_nlink = from->stx_nlink;
+  to->st_uid = from->stx_uid;
+  to->st_gid = from->stx_gid;
+  to->st_atime = from->stx_atime.tv_sec;
+  to->st_atim.tv_nsec = from->stx_atime.tv_nsec;
+  to->st_mtime = from->stx_mtime.tv_sec;
+  to->st_mtim.tv_nsec = from->stx_mtime.tv_nsec;
+  to->st_ctime = from->stx_ctime.tv_sec;
+  to->st_ctim.tv_nsec = from->stx_ctime.tv_nsec;
+  to->st_size = from->stx_size;
+  to->st_blocks = from->stx_blocks;
+  to->st_blksize = from->stx_blksize;
+}
+#endif
diff --git a/sysdeps/unix/sysv/linux/statx_cp.h b/sysdeps/unix/sysv/linux/statx_cp.h
new file mode 100644
index 0000000..7e411a7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/statx_cp.h
@@ -0,0 +1,23 @@
+/* Struct statx to stat/stat64 conversion for Linux.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+extern void __cp_stat_statx (struct stat *to, struct statx *from)
+  attribute_hidden;
+
+extern void __cp_stat64_statx (struct stat64 *to, struct statx *from)
+  attribute_hidden;
diff --git a/sysdeps/unix/sysv/linux/wordsize-64/statx_cp.c b/sysdeps/unix/sysv/linux/wordsize-64/statx_cp.c
new file mode 100644
index 0000000..260cda9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/wordsize-64/statx_cp.c
@@ -0,0 +1,3 @@
+/* Override the generic statx_cp.c which is only needed for new 32-bit arch
+   without stat64 family support.
+ */
-- 
2.7.4


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