[Bug go/88060] ../../../gcc-8.2.0/libgo/go/syscall/libcall_linux_utimesnano.go:17:18: error: reference to undefined name ‘_AT_FDCWD’

["mfe at live dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88060

martin <mfe at live dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mfe at live dot de

--- Comment #2 from martin <mfe at live dot de> ---
Created attachment 45023
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45023&action=edit
gen-sysinfo.go

(In reply to Ian Lance Taylor from comment #1)
> Can you attach the contents of sparc-unknown-linux-gnu/libgo/gen-sysinfo.go
> from your build directory?
> 
> Does the C header file <fcntl.h> on your system define AT_FDCWD?  (It
> normally comes from <bits/fcntl-linux.h>.)  If not, why not?  Where is it
> defined?

I found the file in /usr/include/fcntl.h which does not define AT_FDCWD. The
content of it:

/* Copyright (C) 1991,1992,1994-2001,2003 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/*
 *      POSIX Standard: 6.5 File Control Operations     <fcntl.h>
 */

#ifndef _FCNTL_H
#define _FCNTL_H        1

#include <features.h>

/* This must be early so <bits/fcntl.h> can define types winningly.  */
__BEGIN_DECLS

/* Get the definitions of O_*, F_*, FD_*: all the
   numbers and flag bits for `open', `fcntl', et al.  */
#include <bits/fcntl.h>

/* For XPG all symbols from <sys/stat.h> should also be available.  */
#ifdef __USE_XOPEN
# include <sys/stat.h>
#endif

#ifdef  __USE_MISC
# ifndef R_OK                   /* Verbatim from <unistd.h>.  Ugh.  */
/* Values for the second argument to access.
   These may be OR'd together.  */
#  define R_OK  4               /* Test for read permission.  */
#  define W_OK  2               /* Test for write permission.  */
#  define X_OK  1               /* Test for execute permission.  */
#  define F_OK  0               /* Test for existence.  */
# endif
#endif /* Use misc.  */

/* XPG wants the following symbols.  */
#ifdef __USE_XOPEN              /* <stdio.h> has the same definitions.  */
# define SEEK_SET       0       /* Seek from beginning of file.  */
# define SEEK_CUR       1       /* Seek from current position.  */
# define SEEK_END       2       /* Seek from end of file.  */
#endif  /* XPG */

/* Do the file control operation described by CMD on FD.
   The remaining arguments are interpreted depending on CMD.

   This function is a cancellation point and therefore not marked with
   __THROW.  */
extern int fcntl (int __fd, int __cmd, ...);

/* Open FILE and return a new file descriptor for it, or -1 on error.
   OFLAG determines the type of access used.  If O_CREAT is on OFLAG,
   the third argument is taken as a `mode_t', the mode of the created file.

   This function is a cancellation point and therefore not marked with
   __THROW.  */
#ifndef __USE_FILE_OFFSET64
extern int open (__const char *__file, int __oflag, ...);
#else
# ifdef __REDIRECT
extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64);
# else
#  define open open64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int open64 (__const char *__file, int __oflag, ...);
#endif

/* Create and open FILE, with mode MODE.  This takes an `int' MODE
   argument because that is what `mode_t' will be widened to.

   This function is a cancellation point and therefore not marked with
   __THROW.  */
#ifndef __USE_FILE_OFFSET64
extern int creat (__const char *__file, __mode_t __mode);
#else
# ifdef __REDIRECT
extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode),
                       creat64);
# else
#  define creat creat64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int creat64 (__const char *__file, __mode_t __mode);
#endif

#if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
                                               && !defined __USE_POSIX))
/* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
   files consistent.  Some systems have them there and some here, and some
   software depends on the macros being defined without including both.  */

/* `lockf' is a simpler interface to the locking facilities of `fcntl'.
   LEN is always relative to the current file position.
   The CMD argument is one of the following.  */

# define F_ULOCK 0      /* Unlock a previously locked region.  */
# define F_LOCK  1      /* Lock a region for exclusive use.  */
# define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
# define F_TEST  3      /* Test a region for other processes locks.  */

# ifndef __USE_FILE_OFFSET64
extern int lockf (int __fd, int __cmd, __off_t __len);
# else
# ifdef __REDIRECT
extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
# else
#  define lockf lockf64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int lockf64 (int __fd, int __cmd, __off64_t __len);
# endif
#endif

#ifdef __USE_XOPEN2K
/* Advice the system about the expected behaviour of the application with
   respect to the file associated with FD.  */
# ifndef __USE_FILE_OFFSET64
extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
                          int __advise) __THROW;
# else
# ifdef __REDIRECT
extern int __REDIRECT (posix_fadvise, (int __fd, __off64_t __offset,
                                       __off64_t __len, int __advise) __THROW,
                       posix_fadvise64);
# else
#  define posix_fadvise posix_fadvise64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
                            int __advise) __THROW;
# endif


/* Reserve storage for the data of the file associated with FD.

   This function is a possible cancellation points and therefore not
   marked with __THROW.  */
# ifndef __USE_FILE_OFFSET64
extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
# else
# ifdef __REDIRECT
extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
                                         __off64_t __len),
                       posix_fallocate64);
# else
#  define posix_fallocate posix_fallocate64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
# endif
#endif

__END_DECLS

#endif /* fcntl.h  */

/usr/include/sys/fcntl.h only contains a "#include <fcntl.h>". I guess AT_FDCWD
is missing because of the old POSIX version.