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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /misc/sys/cdefs.h
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+/* Copyright (C) 1992, 1993, 1994, 1995 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., 675 Mass Ave,
+Cambridge, MA 02139, 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 *
+typedef long double __long_double_t;
+
+#else
+
+#define __CONCAT(x,y) x/**/y
+#define __STRING(x) "x"
+
+#define __ptr_t char *
+typedef double __long_double_t;
+
+#endif
+
+/* The BSD header files use the ANSI keywords unmodified. (This means that
+ old programs may lose if they use the new keywords as identifiers.) 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
+
+/* 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
+
+#endif /* sys/cdefs.h */