gcc/config/nios2/rtems.h

/* Definitions for rtems targeting a NIOS2 using ELF.
   Copyright (C) 2011-2021 Free Software Foundation, Inc.

   Contributed by Chris Johns (chrisj@rtems.org).

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3, or (at your
   option) any later version.

   GCC 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 General Public
   License for more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

/* Specify predefined symbols in preprocessor.  */
#define TARGET_OS_CPP_BUILTINS()        \
do {                                    \
  builtin_define ("__rtems__");         \
  builtin_define ("__USE_INIT_FINI__"); \
  builtin_assert ("system=rtems");      \
} while (0)

/* This toolchain implements the ABI for Linux Systems documented in the
   Nios II Processor Reference Handbook.

   This is done so RTEMS targets have Thread Local Storage like Linux.  */
#define TARGET_LINUX_ABI 1