/usr/include/x86_64-linux-gnu/bits/environments.h is in libc6-dev 2.23-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /* Copyright (C) 1999-2016 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _UNISTD_H
# error "Never include this file directly. Use <unistd.h> instead"
#endif
#include <bits/wordsize.h>
/* This header should define the following symbols under the described
situations. A value `1' means that the model is always supported,
`-1' means it is never supported. Undefined means it cannot be
statically decided.
_POSIX_V7_ILP32_OFF32 32bit int, long, pointers, and off_t type
_POSIX_V7_ILP32_OFFBIG 32bit int, long, and pointers and larger off_t type
_POSIX_V7_LP64_OFF32 64bit long and pointers and 32bit off_t type
_POSIX_V7_LPBIG_OFFBIG 64bit long and pointers and large off_t type
The macros _POSIX_V6_ILP32_OFF32, _POSIX_V6_ILP32_OFFBIG,
_POSIX_V6_LP64_OFF32, _POSIX_V6_LPBIG_OFFBIG, _XBS5_ILP32_OFF32,
_XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and _XBS5_LPBIG_OFFBIG were
used in previous versions of the Unix standard and are available
only for compatibility.
*/
#if __WORDSIZE == 64
/* Environments with 32-bit wide pointers are optionally provided.
Therefore following macros aren't defined:
# undef _POSIX_V7_ILP32_OFF32
# undef _POSIX_V7_ILP32_OFFBIG
# undef _POSIX_V6_ILP32_OFF32
# undef _POSIX_V6_ILP32_OFFBIG
# undef _XBS5_ILP32_OFF32
# undef _XBS5_ILP32_OFFBIG
and users need to check at runtime. */
/* We also have no use (for now) for an environment with bigger pointers
and offsets. */
# define _POSIX_V7_LPBIG_OFFBIG -1
# define _POSIX_V6_LPBIG_OFFBIG -1
# define _XBS5_LPBIG_OFFBIG -1
/* By default we have 64-bit wide `long int', pointers and `off_t'. */
# define _POSIX_V7_LP64_OFF64 1
# define _POSIX_V6_LP64_OFF64 1
# define _XBS5_LP64_OFF64 1
#else /* __WORDSIZE == 32 */
/* We have 32-bit wide `int', `long int' and pointers and all platforms
support LFS. -mx32 has 64-bit wide `off_t'. */
# define _POSIX_V7_ILP32_OFFBIG 1
# define _POSIX_V6_ILP32_OFFBIG 1
# define _XBS5_ILP32_OFFBIG 1
# ifndef __x86_64__
/* -m32 has 32-bit wide `off_t'. */
# define _POSIX_V7_ILP32_OFF32 1
# define _POSIX_V6_ILP32_OFF32 1
# define _XBS5_ILP32_OFF32 1
# endif
/* We optionally provide an environment with the above size but an 64-bit
side `off_t'. Therefore we don't define _POSIX_V7_ILP32_OFFBIG. */
/* Environments with 64-bit wide pointers can be provided,
so these macros aren't defined:
# undef _POSIX_V7_LP64_OFF64
# undef _POSIX_V7_LPBIG_OFFBIG
# undef _POSIX_V6_LP64_OFF64
# undef _POSIX_V6_LPBIG_OFFBIG
# undef _XBS5_LP64_OFF64
# undef _XBS5_LPBIG_OFFBIG
and sysconf tests for it at runtime. */
#endif /* __WORDSIZE == 32 */
#define __ILP32_OFF32_CFLAGS "-m32"
#define __ILP32_OFF32_LDFLAGS "-m32"
#if defined __x86_64__ && defined __ILP32__
# define __ILP32_OFFBIG_CFLAGS "-mx32"
# define __ILP32_OFFBIG_LDFLAGS "-mx32"
#else
# define __ILP32_OFFBIG_CFLAGS "-m32 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
# define __ILP32_OFFBIG_LDFLAGS "-m32"
#endif
#define __LP64_OFF64_CFLAGS "-m64"
#define __LP64_OFF64_LDFLAGS "-m64"
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