Edit: environments.h
/* Copyright (C) 1999-2018 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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