glibc/misc/sys/cdefs.h

/* Copyright (C) 1992, 93, 94, 95, 96, 97 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  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

#include <features.h>

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

#ifdef __GNUC__

#define	__P(args)	args	/* GCC can always grok prototypes.  */
#define	__DOTS		, ...

#else	/* Not GCC.  */

#define	__inline		/* No inline functions.  */

#if (defined (__STDC__) && __STDC__) || defined (__cplusplus)

#define	__P(args)	args
#define	__const		const
#define	__signed	signed
#define	__volatile	volatile
#define	__DOTS		, ...

#else	/* Not ANSI C or C++.  */

#define	__P(args)	()	/* No prototypes.  */
#define	__const			/* No ANSI C keywords.  */
#define	__signed
#define	__volatile
#define	__DOTS

#endif	/* ANSI C or C++.  */

#endif	/* GCC.  */

/* For these things, GCC behaves the ANSI way normally,
   and the non-ANSI way under -traditional.  */

#if defined (__STDC__) && __STDC__

#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

#else

#define	__CONCAT(x,y)	x/**/y
#define	__STRING(x)	"x"

#define __ptr_t char *
#define __long_double_t  long double

/* The BSD header files use the ANSI keywords unmodified (this means that
   old programs may lose if they use the new keywords as identifiers), but
   those names are not available under -traditional.  We define them to
   their __ versions, which are taken care of above.  */
#ifdef	__USE_BSD
#define	const		__const
#define	signed		__signed
#define	volatile	__volatile
#endif

#endif	/* __STDC__ */


/* 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

/* GCC2 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


/* For now no version of gcc knows the `restrict' keyword.  Define it
   for now unconditionally to the empty string.  */
#define __restrict

#endif	 /* sys/cdefs.h */