bits/environments.h

   1 /* Copyright (C) 1999-2023 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _UNISTD_H
  19 # error "Never include this file directly.  Use <unistd.h> instead"
  20 #endif
  21
  22 #include <bits/wordsize.h>
  23
  24 /* This header should define the following symbols under the described
  25    situations.  A value `1' means that the model is always supported,
  26    `-1' means it is never supported.  Undefined means it cannot be
  27    statically decided.
  28
  29    _POSIX_V7_ILP32_OFF32   32bit int, long, pointers, and off_t type
  30    _POSIX_V7_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
  31
  32    _POSIX_V7_LP64_OFF32    64bit long and pointers and 32bit off_t type
  33    _POSIX_V7_LPBIG_OFFBIG  64bit long and pointers and large off_t type
  34
  35    The macros _POSIX_V6_ILP32_OFF32, _POSIX_V6_ILP32_OFFBIG,
  36    _POSIX_V6_LP64_OFF32, _POSIX_V6_LPBIG_OFFBIG, _XBS5_ILP32_OFF32,
  37    _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and _XBS5_LPBIG_OFFBIG were
  38    used in previous versions of the Unix standard and are available
  39    only for compatibility.
  40 */
  41
  42 #if __WORDSIZE == 64
  43
  44 /* We can never provide environments with 32-bit wide pointers.  */
  45 # define _POSIX_V7_ILP32_OFF32  -1
  46 # define _POSIX_V7_ILP32_OFFBIG -1
  47 # define _POSIX_V6_ILP32_OFF32  -1
  48 # define _POSIX_V6_ILP32_OFFBIG -1
  49 # define _XBS5_ILP32_OFF32      -1
  50 # define _XBS5_ILP32_OFFBIG     -1
  51 /* We also have no use (for now) for an environment with bigger pointers
  52    and offsets.  */
  53 # define _POSIX_V7_LPBIG_OFFBIG -1
  54 # define _POSIX_V6_LPBIG_OFFBIG -1
  55 # define _XBS5_LPBIG_OFFBIG     -1
  56
  57 /* By default we have 64-bit wide `long int', pointers and `off_t'.  */
  58 # define _POSIX_V7_LP64_OFF64   1
  59 # define _POSIX_V6_LP64_OFF64   1
  60 # define _XBS5_LP64_OFF64       1
  61
  62 #else /* __WORDSIZE == 32 */
  63
  64 /* By default we have 32-bit wide `int', `long int', pointers and `off_t'
  65    and all platforms support LFS.  */
  66 # define _POSIX_V7_ILP32_OFF32  1
  67 # define _POSIX_V7_ILP32_OFFBIG 1
  68 # define _POSIX_V6_ILP32_OFF32  1
  69 # define _POSIX_V6_ILP32_OFFBIG 1
  70 # define _XBS5_ILP32_OFF32      1
  71 # define _XBS5_ILP32_OFFBIG     1
  72
  73 /* We optionally provide an environment with the above size but an 64-bit
  74    side `off_t'.  Therefore we don't define _POSIX_V7_ILP32_OFFBIG.  */
  75
  76 /* We can never provide environments with 64-bit wide pointers.  */
  77 # define _POSIX_V7_LP64_OFF64   -1
  78 # define _POSIX_V7_LPBIG_OFFBIG -1
  79 # define _POSIX_V6_LP64_OFF64   -1
  80 # define _POSIX_V6_LPBIG_OFFBIG -1
  81 # define _XBS5_LP64_OFF64       -1
  82 # define _XBS5_LPBIG_OFFBIG     -1
  83
  84 /* CFLAGS.  */
  85 #define __ILP32_OFFBIG_CFLAGS   "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
  86
  87 #endif /* __WORDSIZE == 32 */