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/* Copyright (C) 1992-2001, 2002 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.  */

#ifndef _SYS_CDEFS_H

#define _SYS_CDEFS_H    1

/* We are almost always included from features.h. */

#ifndef _FEATURES_H

# include <features.h>

#endif

/* The GNU libc does not support any K&R compilers or the traditional mode

   of ISO C compilers anymore.  Check for some of the combinations not

   anymore supported.  */

#if defined __GNUC__ && !defined __STDC__

# error "You need a ISO C conforming compiler to use the glibc headers"

#endif

/* Some user header file might have defined this before.  */

#undef  __P

#undef  __PMT

#ifdef __GNUC__

/* GCC can always grok prototypes.  For C++ programs we add throw()

   to help it optimize the function calls.  But this works only with

   gcc 2.8.x and egcs.  */

# if defined __cplusplus && __GNUC_PREREQ (2,8)

#  define __THROW       throw ()

# else

#  define __THROW

# endif

# define __P(args)      args __THROW

/* This macro will be used for functions which might take C++ callback

   functions.  */

# define __PMT(args)    args

#else   /* Not GCC.  */

# define __inline               /* No inline functions.  */

# define __THROW

# define __P(args)      args

# define __PMT(args)    args

# define __const        const

# define __signed       signed

# define __volatile     volatile

#endif  /* GCC.  */

/* For these things, GCC behaves the ANSI way normally,

   and the non-ANSI way under -traditional.  */

#define __CONCAT(x,y)   x ## y

#define __STRING(x)     #x

/* This is not a typedef so `const __ptr_t' does the right thing.  */

#define __ptr_t void *

#define __long_double_t  long double

/* C++ needs to know that types and declarations are C, not C++.  */

#ifdef  __cplusplus

# define __BEGIN_DECLS  extern "C" {

# define __END_DECLS    }

#else

# define __BEGIN_DECLS

# define __END_DECLS

#endif

/* The standard library needs the functions from the ISO C90 standard

   in the std namespace.  At the same time we want to be safe for

   future changes and we include the ISO C99 code in the non-standard

   namespace __c99.  The C++ wrapper header take case of adding the

   definitions to the global namespace.  */

#if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES

# define __BEGIN_NAMESPACE_STD  namespace std {

# define __END_NAMESPACE_STD    }

# define __USING_NAMESPACE_STD(name) using std::name;

# define __BEGIN_NAMESPACE_C99  namespace __c99 {

# define __END_NAMESPACE_C99    }

# define __USING_NAMESPACE_C99(name) using __c99::name;

#else

/* For compatibility we do not add the declarations into any

   namespace.  They will end up in the global namespace which is what

   old code expects.  */

# define __BEGIN_NAMESPACE_STD

# define __END_NAMESPACE_STD

# define __USING_NAMESPACE_STD(name)

# define __BEGIN_NAMESPACE_C99

# define __END_NAMESPACE_C99

# define __USING_NAMESPACE_C99(name)

#endif

/* Support for bounded pointers.  */

#ifndef __BOUNDED_POINTERS__

# define __bounded      /* nothing */

# define __unbounded    /* nothing */

# define __ptrvalue     /* nothing */

#endif

/* Support for flexible arrays.  */

#if __GNUC_PREREQ (2,97)

/* GCC 2.97 supports C99 flexible array members.  */

# define __flexarr      []

#else

# ifdef __GNUC__

#  define __flexarr     [0]

# else

#  if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L

#   define __flexarr    []

#  else

/* Some other non-C99 compiler.  Approximate with [1].  */

#   define __flexarr    [1]

#  endif

# endif

#endif

/* __asm__ ("xyz") is used throughout the headers to rename functions

   at the assembly language level.  This is wrapped by the __REDIRECT

   macro, in order to support compilers that can do this some other

   way.  When compilers don't support asm-names at all, we have to do

   preprocessor tricks instead (which don't have exactly the right

   semantics, but it's the best we can do).

   Example:

   int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */

#if defined __GNUC__ && __GNUC__ >= 2

# define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))

# define __ASMNAME(cname) __C_SYMBOL_PREFIX__ cname

/*

#elif __SOME_OTHER_COMPILER__

# define __REDIRECT(name, proto, alias) name proto; \

        _Pragma("let " #name " = " #alias)

*/

#endif

/* GCC has various useful declarations that can be made with the

   `__attribute__' syntax.  All of the ways we use this do fine if

   they are omitted for compilers that don't understand it. */

#if !defined __GNUC__ || __GNUC__ < 2

# define __attribute__(xyz)     /* Ignore */

#endif

/* At some point during the gcc 2.96 development the `malloc' attribute

   for functions was introduced.  We don't want to use it unconditionally

   (although this would be possible) since it generates warnings.  */

#if __GNUC_PREREQ (2,96)

# define __attribute_malloc__ __attribute__ ((__malloc__))

#else

# define __attribute_malloc__ /* Ignore */

#endif

/* At some point during the gcc 2.96 development the `pure' attribute

   for functions was introduced.  We don't want to use it unconditionally

   (although this would be possible) since it generates warnings.  */

#if __GNUC_PREREQ (2,96)

# define __attribute_pure__ __attribute__ ((__pure__))

#else

# define __attribute_pure__ /* Ignore */

#endif

/* At some point during the gcc 3.1 development the `used' attribute

   for functions was introduced.  We don't want to use it unconditionally

   (although this would be possible) since it generates warnings.  */

#if __GNUC_PREREQ (3,1)

# define __attribute_used__ __attribute__ ((__used__))

# define __attribute_noinline__ __attribute__ ((__noinline__))

#else

# define __attribute_used__ __attribute__ ((__unused__))

# define __attribute_noinline__ /* Ignore */

#endif

/* gcc allows marking deprecated functions.  */

#if __GNUC_PREREQ (3,2)

# define __attribute_deprecated__ __attribute__ ((__deprecated__))

#else

# define __attribute_deprecated__ /* Ignore */

#endif

/* At some point during the gcc 2.8 development the `format_arg' attribute

   for functions was introduced.  We don't want to use it unconditionally

   (although this would be possible) since it generates warnings.

   If several `format_arg' attributes are given for the same function, in

   gcc-3.0 and older, all but the last one are ignored.  In newer gccs,

   all designated arguments are considered.  */

#if __GNUC_PREREQ (2,8)

# define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))

#else

# define __attribute_format_arg__(x) /* Ignore */

#endif

/* At some point during the gcc 2.97 development the `strfmon' format

   attribute for functions was introduced.  We don't want to use it

   unconditionally (although this would be possible) since it

   generates warnings.  */

#if __GNUC_PREREQ (2,97)

# define __attribute_format_strfmon__(a,b) \

  __attribute__ ((__format__ (__strfmon__, a, b)))

#else

# define __attribute_format_strfmon__(a,b) /* Ignore */

#endif

/* It is possible to compile containing GCC extensions even if GCC is

   run in pedantic mode if the uses are carefully marked using the

   `__extension__' keyword.  But this is not generally available before

   version 2.8.  */

#if !__GNUC_PREREQ (2,8)

# define __extension__          /* Ignore */

#endif

/* __restrict is known in EGCS 1.2 and above. */

#if !__GNUC_PREREQ (2,92)

# define __restrict     /* Ignore */

#endif

/* ISO C99 also allows to declare arrays as non-overlapping.  The syntax is

     array_name[restrict]

   GCC 3.1 supports this.  */

#if __GNUC_PREREQ (3,1) && !defined __GNUG__

# define __restrict_arr __restrict

#else

# ifdef __GNUC__

#  define __restrict_arr        /* Not supported in old GCC.  */

# else

#  if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L

#   define __restrict_arr       restrict

#  else

/* Some other non-C99 compiler.  */

#   define __restrict_arr       /* Not supported.  */

#  endif

# endif

#endif

#endif   /* sys/cdefs.h */