1/* Copyright (C) 1999-2022 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/* Environments with 32-bit wide pointers are optionally provided.
45 Therefore following macros aren't defined:
46 # undef _POSIX_V7_ILP32_OFF32
47 # undef _POSIX_V7_ILP32_OFFBIG
48 # undef _POSIX_V6_ILP32_OFF32
49 # undef _POSIX_V6_ILP32_OFFBIG
50 # undef _XBS5_ILP32_OFF32
51 # undef _XBS5_ILP32_OFFBIG
52 and users need to check at runtime. */
53
54/* We also have no use (for now) for an environment with bigger pointers
55 and offsets. */
56# define _POSIX_V7_LPBIG_OFFBIG -1
57# define _POSIX_V6_LPBIG_OFFBIG -1
58# define _XBS5_LPBIG_OFFBIG -1
59
60/* By default we have 64-bit wide `long int', pointers and `off_t'. */
61# define _POSIX_V7_LP64_OFF64 1
62# define _POSIX_V6_LP64_OFF64 1
63# define _XBS5_LP64_OFF64 1
64
65#else /* __WORDSIZE == 32 */
66
67/* We have 32-bit wide `int', `long int' and pointers and all platforms
68 support LFS. -mx32 has 64-bit wide `off_t'. */
69# define _POSIX_V7_ILP32_OFFBIG 1
70# define _POSIX_V6_ILP32_OFFBIG 1
71# define _XBS5_ILP32_OFFBIG 1
72
73# ifndef __x86_64__
74/* -m32 has 32-bit wide `off_t'. */
75# define _POSIX_V7_ILP32_OFF32 1
76# define _POSIX_V6_ILP32_OFF32 1
77# define _XBS5_ILP32_OFF32 1
78# endif
79
80/* We optionally provide an environment with the above size but an 64-bit
81 side `off_t'. Therefore we don't define _POSIX_V7_ILP32_OFFBIG. */
82
83/* Environments with 64-bit wide pointers can be provided,
84 so these macros aren't defined:
85 # undef _POSIX_V7_LP64_OFF64
86 # undef _POSIX_V7_LPBIG_OFFBIG
87 # undef _POSIX_V6_LP64_OFF64
88 # undef _POSIX_V6_LPBIG_OFFBIG
89 # undef _XBS5_LP64_OFF64
90 # undef _XBS5_LPBIG_OFFBIG
91 and sysconf tests for it at runtime. */
92
93#endif /* __WORDSIZE == 32 */
94
95#define __ILP32_OFF32_CFLAGS "-m32"
96#define __ILP32_OFF32_LDFLAGS "-m32"
97#if defined __x86_64__ && defined __ILP32__
98# define __ILP32_OFFBIG_CFLAGS "-mx32"
99# define __ILP32_OFFBIG_LDFLAGS "-mx32"
100#else
101# define __ILP32_OFFBIG_CFLAGS "-m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
102# define __ILP32_OFFBIG_LDFLAGS "-m32"
103#endif
104#define __LP64_OFF64_CFLAGS "-m64"
105#define __LP64_OFF64_LDFLAGS "-m64"
106

source code of include/x86_64-linux-gnu/bits/environments.h