glibc/sysdeps/unix/sysv/linux/dl-sysdep.h

/* System-specific settings for dynamic linker code.  Linux version.
   Copyright (C) 2005, 2008 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.  */

#include_next <dl-sysdep.h>

/* On many architectures the kernel provides a virtual DSO and gives
   AT_SYSINFO_EHDR to point us to it.  As this is introduced for new
   machines, we should look at it for unwind information even if
   we aren't making direct use of it.  So enable this across the board.  */

#define NEED_DL_SYSINFO_DSO	1


/* The _dl_discover_osversion function is so far only needed in sysconf
   to check for kernels later than 2.6.23.  */
#if !defined __ASSEMBLER__ && __LINUX_KERNEL_VERSION < 0x020617
/* Get version of the OS.  */
extern int _dl_discover_osversion (void) attribute_hidden;
# define HAVE_DL_DISCOVER_OSVERSION	1
#endif