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451 lines
15 KiB
451 lines
15 KiB
/* Copyright (C) 1991-1993,1995-2006,2007,2009 Free Software Foundation, Inc. |
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This file is part of the GNU C Library. |
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The GNU C Library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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The GNU C Library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with the GNU C Library; if not, write to the Free |
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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02111-1307 USA. */ |
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#ifndef _FEATURES_H |
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#define _FEATURES_H 1 |
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/* These are defined by the user (or the compiler) |
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to specify the desired environment: |
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__STRICT_ANSI__ ISO Standard C. |
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_ISOC99_SOURCE Extensions to ISO C89 from ISO C99. |
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_POSIX_SOURCE IEEE Std 1003.1. |
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_POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; |
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if >=199309L, add IEEE Std 1003.1b-1993; |
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if >=199506L, add IEEE Std 1003.1c-1995; |
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if >=200112L, all of IEEE 1003.1-2004 |
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if >=200809L, all of IEEE 1003.1-2008 |
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_XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if |
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Single Unix conformance is wanted, to 600 for the |
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sixth revision, to 700 for the seventh revision. |
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_XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. |
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_LARGEFILE_SOURCE Some more functions for correct standard I/O. |
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_LARGEFILE64_SOURCE Additional functionality from LFS for large files. |
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_FILE_OFFSET_BITS=N Select default filesystem interface. |
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_BSD_SOURCE ISO C, POSIX, and 4.3BSD things. |
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_SVID_SOURCE ISO C, POSIX, and SVID things. |
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_ATFILE_SOURCE Additional *at interfaces. |
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_GNU_SOURCE All of the above, plus GNU extensions. |
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_REENTRANT Select additionally reentrant object. |
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_THREAD_SAFE Same as _REENTRANT, often used by other systems. |
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_FORTIFY_SOURCE If set to numeric value > 0 additional security |
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measures are defined, according to level. |
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The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__. |
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If none of these are defined, the default is to have _SVID_SOURCE, |
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_BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to |
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200112L. If more than one of these are defined, they accumulate. |
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For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE |
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together give you ISO C, 1003.1, and 1003.2, but nothing else. |
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These are defined by this file and are used by the |
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header files to decide what to declare or define: |
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__USE_ISOC99 Define ISO C99 things. |
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__USE_ISOC95 Define ISO C90 AMD1 (C95) things. |
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__USE_POSIX Define IEEE Std 1003.1 things. |
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__USE_POSIX2 Define IEEE Std 1003.2 things. |
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__USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. |
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__USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. |
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__USE_XOPEN Define XPG things. |
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__USE_XOPEN_EXTENDED Define X/Open Unix things. |
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__USE_UNIX98 Define Single Unix V2 things. |
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__USE_XOPEN2K Define XPG6 things. |
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__USE_XOPEN2K8 Define XPG7 things. |
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__USE_LARGEFILE Define correct standard I/O things. |
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__USE_LARGEFILE64 Define LFS things with separate names. |
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__USE_FILE_OFFSET64 Define 64bit interface as default. |
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__USE_BSD Define 4.3BSD things. |
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__USE_SVID Define SVID things. |
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__USE_MISC Define things common to BSD and System V Unix. |
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__USE_ATFILE Define *at interfaces and AT_* constants for them. |
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__USE_GNU Define GNU extensions. |
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__USE_REENTRANT Define reentrant/thread-safe *_r functions. |
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__USE_FORTIFY_LEVEL Additional security measures used, according to level. |
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__FAVOR_BSD Favor 4.3BSD things in cases of conflict. |
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The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are |
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defined by this file unconditionally. `__GNU_LIBRARY__' is provided |
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only for compatibility. All new code should use the other symbols |
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to test for features. |
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All macros listed above as possibly being defined by this file are |
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explicitly undefined if they are not explicitly defined. |
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Feature-test macros that are not defined by the user or compiler |
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but are implied by the other feature-test macros defined (or by the |
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lack of any definitions) are defined by the file. */ |
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/* Undefine everything, so we get a clean slate. */ |
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#undef __USE_ISOC99 |
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#undef __USE_ISOC95 |
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#undef __USE_POSIX |
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#undef __USE_POSIX2 |
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#undef __USE_POSIX199309 |
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#undef __USE_POSIX199506 |
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#undef __USE_XOPEN |
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#undef __USE_XOPEN_EXTENDED |
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#undef __USE_UNIX98 |
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#undef __USE_XOPEN2K |
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#undef __USE_XOPEN2K8 |
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#undef __USE_LARGEFILE |
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#undef __USE_LARGEFILE64 |
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#undef __USE_FILE_OFFSET64 |
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#undef __USE_BSD |
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#undef __USE_SVID |
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#undef __USE_MISC |
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#undef __USE_ATFILE |
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#undef __USE_GNU |
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#undef __USE_REENTRANT |
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#undef __USE_FORTIFY_LEVEL |
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#undef __FAVOR_BSD |
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#undef __KERNEL_STRICT_NAMES |
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/* Suppress kernel-name space pollution unless user expressedly asks |
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for it. */ |
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#ifndef _LOOSE_KERNEL_NAMES |
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# define __KERNEL_STRICT_NAMES |
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#endif |
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/* Always use ISO C things. */ |
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#define __USE_ANSI 1 |
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/* Convenience macros to test the versions of glibc and gcc. |
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Use them like this: |
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#if __GNUC_PREREQ (2,8) |
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... code requiring gcc 2.8 or later ... |
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#endif |
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Note - they won't work for gcc1 or glibc1, since the _MINOR macros |
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were not defined then. */ |
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#if defined __GNUC__ && defined __GNUC_MINOR__ |
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# define __GNUC_PREREQ(maj, min) \ |
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) |
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#else |
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# define __GNUC_PREREQ(maj, min) 0 |
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#endif |
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/* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ |
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#if defined _BSD_SOURCE && \ |
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!(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \ |
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defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \ |
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defined _GNU_SOURCE || defined _SVID_SOURCE) |
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# define __FAVOR_BSD 1 |
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#endif |
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/* If _GNU_SOURCE was defined by the user, turn on all the other features. */ |
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#ifdef _GNU_SOURCE |
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# undef _ISOC99_SOURCE |
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# define _ISOC99_SOURCE 1 |
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# undef _POSIX_SOURCE |
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# define _POSIX_SOURCE 1 |
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# undef _POSIX_C_SOURCE |
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# define _POSIX_C_SOURCE 200809L |
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# undef _XOPEN_SOURCE |
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# define _XOPEN_SOURCE 700 |
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# undef _XOPEN_SOURCE_EXTENDED |
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# define _XOPEN_SOURCE_EXTENDED 1 |
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# undef _LARGEFILE64_SOURCE |
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# define _LARGEFILE64_SOURCE 1 |
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# undef _BSD_SOURCE |
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# define _BSD_SOURCE 1 |
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# undef _SVID_SOURCE |
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# define _SVID_SOURCE 1 |
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# undef _ATFILE_SOURCE |
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# define _ATFILE_SOURCE 1 |
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#endif |
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/* This macro indicates that the installed library is uClibc. Use |
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* __UCLIBC_MAJOR__ and __UCLIBC_MINOR__ to test for the features in |
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* specific releases. */ |
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#define __UCLIBC__ 1 |
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#ifdef __UCLIBC__ |
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/* Load up the current set of uClibc supported features along |
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* with the current uClibc major and minor version numbers. |
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* For uClibc release 0.9.26, these numbers would be: |
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* #define __UCLIBC_MAJOR__ 0 |
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* #define __UCLIBC_MINOR__ 9 |
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* #define __UCLIBC_SUBLEVEL__ 26 |
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*/ |
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# define __need_uClibc_config_h |
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# include <bits/uClibc_config.h> |
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# undef __need_uClibc_config_h |
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/* For uClibc, always optimize for size -- this should disable |
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* a lot of expensive inlining... |
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* TODO: this is wrong! __OPTIMIZE_SIZE__ is an indicator of |
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* gcc -Os compile. We should not mess with compiler inlines. |
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* We should instead disable __USE_EXTERN_INLINES unconditionally, |
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* or maybe actually audit and test uclibc to work correctly |
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* with __USE_EXTERN_INLINES on. |
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*/ |
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# define __OPTIMIZE_SIZE__ 1 |
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/* disable unsupported features */ |
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# undef __LDBL_COMPAT |
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# ifndef __UCLIBC_HAS_FORTIFY__ |
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# undef _FORTIFY_SOURCE |
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# endif |
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# ifndef __UCLIBC_HAS_THREADS__ |
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# if defined _REENTRANT || defined _THREAD_SAFE |
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# warning requested reentrant code, but thread support was disabled |
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# undef _REENTRANT |
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# undef _THREAD_SAFE |
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# endif |
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# endif |
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# ifndef __UCLIBC_HAS_LFS__ |
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# undef _LARGEFILE64_SOURCE |
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/* NOTE: This is probably incorrect on a 64-bit arch... */ |
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# if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 |
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# error It appears you have defined _FILE_OFFSET_BITS=64. Unfortunately, \ |
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uClibc was built without large file support enabled. |
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# endif |
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# elif defined __BCC__ |
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# error BCC does not support LFS, please disable it |
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# endif |
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#endif /* __UCLIBC__ */ |
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/* If nothing (other than _GNU_SOURCE) is defined, |
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define _BSD_SOURCE and _SVID_SOURCE. */ |
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#if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \ |
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!defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \ |
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!defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \ |
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!defined _BSD_SOURCE && !defined _SVID_SOURCE) |
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# define _BSD_SOURCE 1 |
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# define _SVID_SOURCE 1 |
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#endif |
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/* This is to enable the ISO C99 extension. Also recognize the old macro |
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which was used prior to the standard acceptance. This macro will |
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eventually go away and the features enabled by default once the ISO C99 |
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standard is widely adopted. */ |
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#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ |
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|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) |
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# define __USE_ISOC99 1 |
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#endif |
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/* This is to enable the ISO C90 Amendment 1:1995 extension. */ |
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#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ |
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|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) |
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# define __USE_ISOC95 1 |
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#endif |
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/* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2 |
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(and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */ |
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#if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \ |
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!defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE) |
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# define _POSIX_SOURCE 1 |
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# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 |
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# define _POSIX_C_SOURCE 2 |
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# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600 |
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# define _POSIX_C_SOURCE 199506L |
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# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700 |
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# define _POSIX_C_SOURCE 200112L |
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# else |
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# define _POSIX_C_SOURCE 200809L |
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# endif |
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# define __USE_POSIX_IMPLICITLY 1 |
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#endif |
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#if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE |
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# define __USE_POSIX 1 |
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#endif |
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#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE |
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# define __USE_POSIX2 1 |
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#endif |
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#if (_POSIX_C_SOURCE - 0) >= 199309L |
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# define __USE_POSIX199309 1 |
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#endif |
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#if (_POSIX_C_SOURCE - 0) >= 199506L |
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# define __USE_POSIX199506 1 |
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#endif |
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#if (_POSIX_C_SOURCE - 0) >= 200112L |
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# define __USE_XOPEN2K 1 |
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# undef __USE_ISOC99 |
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# define __USE_ISOC99 1 |
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#endif |
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#if (_POSIX_C_SOURCE - 0) >= 200809L |
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# define __USE_XOPEN2K8 1 |
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# undef _ATFILE_SOURCE |
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# define _ATFILE_SOURCE 1 |
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#endif |
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#ifdef _XOPEN_SOURCE |
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# define __USE_XOPEN 1 |
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# if (_XOPEN_SOURCE - 0) >= 500 |
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# define __USE_XOPEN_EXTENDED 1 |
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# define __USE_UNIX98 1 |
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# undef _LARGEFILE_SOURCE |
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# define _LARGEFILE_SOURCE 1 |
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# if (_XOPEN_SOURCE - 0) >= 600 |
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# if (_XOPEN_SOURCE - 0) >= 700 |
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# define __USE_XOPEN2K8 1 |
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# endif |
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# define __USE_XOPEN2K 1 |
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# undef __USE_ISOC99 |
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# define __USE_ISOC99 1 |
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# endif |
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# else |
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# ifdef _XOPEN_SOURCE_EXTENDED |
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# define __USE_XOPEN_EXTENDED 1 |
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# endif |
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# endif |
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#endif |
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#ifdef _LARGEFILE_SOURCE |
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# define __USE_LARGEFILE 1 |
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#endif |
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#ifdef _LARGEFILE64_SOURCE |
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# define __USE_LARGEFILE64 1 |
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#endif |
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#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 |
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# define __USE_FILE_OFFSET64 1 |
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#endif |
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#if defined _BSD_SOURCE || defined _SVID_SOURCE |
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# define __USE_MISC 1 |
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#endif |
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#ifdef _BSD_SOURCE |
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# define __USE_BSD 1 |
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#endif |
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#ifdef _SVID_SOURCE |
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# define __USE_SVID 1 |
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#endif |
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#ifdef _ATFILE_SOURCE |
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# define __USE_ATFILE 1 |
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#endif |
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#ifdef _GNU_SOURCE |
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# define __USE_GNU 1 |
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#endif |
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#if defined _REENTRANT || defined _THREAD_SAFE |
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# define __USE_REENTRANT 1 |
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#endif |
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#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \ |
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&& __GNUC_PREREQ (4, 1) && defined __OPTIMIZE__ && __OPTIMIZE__ > 0 |
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# if _FORTIFY_SOURCE > 1 |
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# define __USE_FORTIFY_LEVEL 2 |
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# else |
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# define __USE_FORTIFY_LEVEL 1 |
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# endif |
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#else |
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# define __USE_FORTIFY_LEVEL 0 |
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#endif |
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/* We do support the IEC 559 math functionality, real and complex. */ |
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#ifdef __UCLIBC_HAS_FLOATS__ |
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#define __STDC_IEC_559__ 1 |
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#define __STDC_IEC_559_COMPLEX__ 1 |
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#endif |
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#ifdef __UCLIBC_HAS_WCHAR__ |
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/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */ |
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#define __STDC_ISO_10646__ 200009L |
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#endif |
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/* There is an unwholesomely huge amount of code out there that depends on the |
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* presence of GNU libc header files. We have GNU libc header files. So here |
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* we commit a horrible sin. At this point, we _lie_ and claim to be GNU libc |
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* to make things like /usr/include/linux/socket.h and lots of apps work as |
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* their developers intended. This is IMHO, pardonable, since these defines |
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* are not really intended to check for the presence of a particular library, |
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* but rather are used to define an _interface_. */ |
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#if !defined __FORCE_NOGLIBC && (!defined _LIBC || defined __FORCE_GLIBC) |
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/* This macro indicates that the installed library is the GNU C Library. |
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For historic reasons the value now is 6 and this will stay from now |
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on. The use of this variable is deprecated. */ |
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/* uClibc WARNING: leave these aligned to the left, don't put a space after '#', else |
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* broken apps could fail the check. */ |
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#undef __GNU_LIBRARY__ |
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#define __GNU_LIBRARY__ 6 |
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/* Major and minor version number of the GNU C library package. Use |
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these macros to test for features in specific releases. */ |
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/* Don't do it, if you want to keep uClibc happy. */ |
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#define __GLIBC__ 2 |
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#define __GLIBC_MINOR__ 2 |
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#endif |
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#define __GLIBC_PREREQ(maj, min) \ |
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((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) |
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#ifndef __UCLIBC__ |
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/* Decide whether a compiler supports the long long datatypes. */ |
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#if defined __GNUC__ \ |
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|| (defined __PGI && defined __i386__ ) \ |
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|| (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \ |
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|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) |
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# define __GLIBC_HAVE_LONG_LONG 1 |
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#endif |
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#endif |
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/* This is here only because every header file already includes this one. */ |
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#ifndef __ASSEMBLER__ |
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# ifndef _SYS_CDEFS_H |
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# include <sys/cdefs.h> |
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# endif |
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/* If we don't have __REDIRECT, prototypes will be missing if |
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__USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */ |
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# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT |
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# define __USE_LARGEFILE 1 |
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# ifdef __UCLIBC_HAS_LFS__ |
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# define __USE_LARGEFILE64 1 |
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# endif |
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# endif |
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#endif /* !ASSEMBLER */ |
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/* Decide whether we can, and are willing to define extern inline |
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* functions in headers, even if this results in a slightly bigger |
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* code for user programs built against uclibc. |
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* Enabled only in -O2 compiles, not -Os. |
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* uclibc itself is usually built without __USE_EXTERN_INLINES, |
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* remove "&& !defined __OPTIMIZE_SIZE__" part to do otherwise. |
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*/ |
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#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ |
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&& !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ |
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&& (defined __extern_inline || defined __GNUC_GNU_INLINE__ || defined __GNUC_STDC_INLINE__) |
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# define __USE_EXTERN_INLINES 1 |
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#endif |
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#ifdef _LIBC |
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# ifdef __UCLIBC_HAS_LFS__ |
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# undef _FILE_OFFSET_BITS |
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# undef __USE_FILE_OFFSET64 |
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# endif |
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# include <libc-internal.h> |
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#endif |
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#endif /* features.h */
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