misc/sys/cdefs.h

   1 /* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #ifndef _SYS_CDEFS_H
  20
  21 #define _SYS_CDEFS_H    1
  22 #include <features.h>
  23
  24 /* Some user header file might have defined this before.  */
  25 #undef  __P
  26
  27 #ifdef __GNUC__
  28
  29 #define __P(args)       args    /* GCC can always grok prototypes.  */
  30 #define __DOTS          , ...
  31
  32 #else   /* Not GCC.  */
  33
  34 #define __inline                /* No inline functions.  */
  35
  36 #if (defined (__STDC__) && __STDC__) || defined (__cplusplus)
  37
  38 #define __P(args)       args
  39 #define __const         const
  40 #define __signed        signed
  41 #define __volatile      volatile
  42 #define __DOTS          , ...
  43
  44 #else   /* Not ANSI C or C++.  */
  45
  46 #define __P(args)       ()      /* No prototypes.  */
  47 #define __const                 /* No ANSI C keywords.  */
  48 #define __signed
  49 #define __volatile
  50 #define __DOTS
  51
  52 #endif  /* ANSI C or C++.  */
  53
  54 #endif  /* GCC.  */
  55
  56 /* For these things, GCC behaves the ANSI way normally,
  57    and the non-ANSI way under -traditional.  */
  58
  59 #if defined (__STDC__) && __STDC__
  60
  61 #define __CONCAT(x,y)   x ## y
  62 #define __STRING(x)     #x
  63
  64 /* This is not a typedef so `const __ptr_t' does the right thing.  */
  65 #define __ptr_t void *
  66 typedef long double __long_double_t;
  67
  68 #else
  69
  70 #define __CONCAT(x,y)   x/**/y
  71 #define __STRING(x)     "x"
  72
  73 #define __ptr_t char *
  74 typedef double __long_double_t;
  75
  76 #endif
  77
  78 /* The BSD header files use the ANSI keywords unmodified.  (This means that
  79    old programs may lose if they use the new keywords as identifiers.)  We
  80    define them to their __ versions, which are taken care of above.  */
  81
  82 #ifdef  __USE_BSD
  83 #define const           __const
  84 #define signed          __signed
  85 #define volatile        __volatile
  86 #endif
  87
  88 /* C++ needs to know that types and declarations are C, not C++.  */
  89 #ifdef  __cplusplus
  90 #define __BEGIN_DECLS   extern "C" {
  91 #define __END_DECLS     }
  92 #else
  93 #define __BEGIN_DECLS
  94 #define __END_DECLS
  95 #endif
  96
  97 /* GCC2 has various useful declarations that can be made with the
  98    `__attribute__' syntax.  All of the ways we use this do fine if
  99    they are omitted for compilers that don't understand it.  */
 100 #if !defined (__GNUC__) || __GNUC__ < 2
 101 #define __attribute__(xyz)      /* Ignore.  */
 102 #endif
 103
 104 #endif   /* sys/cdefs.h */