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/usr/lib/gcc-cross/powerpc-linux-gnu/6/plugin/include/limitx.h is in gcc-6-plugin-dev-powerpc-linux-gnu 6.4.0-17ubuntu1cross1.

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/* Copyright (C) 1992-2016 Free Software Foundation, Inc.

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/>.  */

/* This administrivia gets added to the beginning of limits.h
   if the system has its own version of limits.h.  */

/* We use _GCC_LIMITS_H_ because we want this not to match
   any macros that the system's limits.h uses for its own purposes.  */
#ifndef _GCC_LIMITS_H_  /* Terminated in limity.h.  */
#define _GCC_LIMITS_H_

#ifndef _LIBC_LIMITS_H_
/* Use "..." so that we find syslimits.h only in this same directory.  */
#include "syslimits.h"
#endif