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- /* Copyright (C) 1991-1993,1995-2006,2007,2009 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 _FEATURES_H
- #define _FEATURES_H 1
- /* These are defined by the user (or the compiler)
- to specify the desired environment:
- __STRICT_ANSI__ ISO Standard C.
- _ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
- _POSIX_SOURCE IEEE Std 1003.1.
- _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
- if >=199309L, add IEEE Std 1003.1b-1993;
- if >=199506L, add IEEE Std 1003.1c-1995;
- if >=200112L, all of IEEE 1003.1-2004
- if >=200809L, all of IEEE 1003.1-2008
- _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
- Single Unix conformance is wanted, to 600 for the
- sixth revision, to 700 for the seventh revision.
- _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
- _LARGEFILE_SOURCE Some more functions for correct standard I/O.
- _LARGEFILE64_SOURCE Additional functionality from LFS for large files.
- _FILE_OFFSET_BITS=N Select default filesystem interface.
- _BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
- _SVID_SOURCE ISO C, POSIX, and SVID things.
- _ATFILE_SOURCE Additional *at interfaces.
- _GNU_SOURCE All of the above, plus GNU extensions.
- _DEFAULT_SOURCE Equivalent to defining _BSD_SOURCE and _SVID_SOURCE.
- _REENTRANT Select additionally reentrant object.
- _THREAD_SAFE Same as _REENTRANT, often used by other systems.
- _FORTIFY_SOURCE If set to numeric value > 0 additional security
- measures are defined, according to level.
- The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
- If none of these are defined, the default is to have _SVID_SOURCE,
- _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
- 200112L. If more than one of these are defined, they accumulate.
- For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
- together give you ISO C, 1003.1, and 1003.2, but nothing else.
- These are defined by this file and are used by the
- header files to decide what to declare or define:
- __USE_ISOC11 Define ISO C11 things.
- __USE_ISOC99 Define ISO C99 things.
- __USE_ISOC95 Define ISO C90 AMD1 (C95) things.
- __USE_POSIX Define IEEE Std 1003.1 things.
- __USE_POSIX2 Define IEEE Std 1003.2 things.
- __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
- __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
- __USE_XOPEN Define XPG things.
- __USE_XOPEN_EXTENDED Define X/Open Unix things.
- __USE_UNIX98 Define Single Unix V2 things.
- __USE_XOPEN2K Define XPG6 things.
- __USE_XOPEN2K8 Define XPG7 things.
- __USE_LARGEFILE Define correct standard I/O things.
- __USE_LARGEFILE64 Define LFS things with separate names.
- __USE_FILE_OFFSET64 Define 64bit interface as default.
- __USE_BSD Define 4.3BSD things.
- __USE_SVID Define SVID things.
- __USE_MISC Define things common to BSD and System V Unix.
- __USE_ATFILE Define *at interfaces and AT_* constants for them.
- __USE_GNU Define GNU extensions.
- __USE_REENTRANT Define reentrant/thread-safe *_r functions.
- __USE_FORTIFY_LEVEL Additional security measures used, according to level.
- The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
- defined by this file unconditionally. `__GNU_LIBRARY__' is provided
- only for compatibility. All new code should use the other symbols
- to test for features.
- All macros listed above as possibly being defined by this file are
- explicitly undefined if they are not explicitly defined.
- Feature-test macros that are not defined by the user or compiler
- but are implied by the other feature-test macros defined (or by the
- lack of any definitions) are defined by the file. */
- /* Undefine everything, so we get a clean slate. */
- #undef __USE_ISOC11
- #undef __USE_ISOC99
- #undef __USE_ISOC95
- #undef __USE_POSIX
- #undef __USE_POSIX2
- #undef __USE_POSIX199309
- #undef __USE_POSIX199506
- #undef __USE_XOPEN
- #undef __USE_XOPEN_EXTENDED
- #undef __USE_UNIX98
- #undef __USE_XOPEN2K
- #undef __USE_XOPEN2K8
- #undef __USE_LARGEFILE
- #undef __USE_LARGEFILE64
- #undef __USE_FILE_OFFSET64
- #undef __USE_BSD
- #undef __USE_SVID
- #undef __USE_MISC
- #undef __USE_ATFILE
- #undef __USE_GNU
- #undef __USE_REENTRANT
- #undef __USE_FORTIFY_LEVEL
- #undef __KERNEL_STRICT_NAMES
- /* Suppress kernel-name space pollution unless user expressedly asks
- for it. */
- #ifndef _LOOSE_KERNEL_NAMES
- # define __KERNEL_STRICT_NAMES
- #endif
- /* Always use ISO C things. */
- #define __USE_ANSI 1
- /* Convenience macros to test the versions of glibc and gcc.
- Use them like this:
- #if __GNUC_PREREQ (2,8)
- ... code requiring gcc 2.8 or later ...
- #endif
- Note - they won't work for gcc1 or glibc1, since the _MINOR macros
- were not defined then. */
- #if defined __GNUC__ && defined __GNUC_MINOR__
- # define __GNUC_PREREQ(maj, min) \
- ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
- #else
- # define __GNUC_PREREQ(maj, min) 0
- #endif
- /* Whether to use feature set F. */
- #define __GLIBC_USE(F) __GLIBC_USE_ ## F
- /* _DEFAULT_SOURCE is equivalent to defining _BSD_SOURCE and _SVID_SOURCE
- * and vice versa. */
- #ifdef _DEFAULT_SOURCE
- # undef _BSD_SOURCE
- # define _BSD_SOURCE 1
- # undef _SVID_SOURCE
- # define _SVID_SOURCE 1
- #endif
- #if defined _BSD_SOURCE || defined _SVID_SOURCE
- # undef _DEFAULT_SOURCE
- # define _DEFAULT_SOURCE 1
- #endif
- /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
- #ifdef _GNU_SOURCE
- # undef _ISOC99_SOURCE
- # define _ISOC99_SOURCE 1
- # undef _ISOC11_SOURCE
- # define _ISOC11_SOURCE 1
- # undef _POSIX_SOURCE
- # define _POSIX_SOURCE 1
- # undef _POSIX_C_SOURCE
- # define _POSIX_C_SOURCE 200809L
- # undef _XOPEN_SOURCE
- # define _XOPEN_SOURCE 700
- # undef _XOPEN_SOURCE_EXTENDED
- # define _XOPEN_SOURCE_EXTENDED 1
- # undef _LARGEFILE64_SOURCE
- # define _LARGEFILE64_SOURCE 1
- # undef _BSD_SOURCE
- # define _BSD_SOURCE 1
- # undef _SVID_SOURCE
- # define _SVID_SOURCE 1
- # undef _ATFILE_SOURCE
- # define _ATFILE_SOURCE 1
- #endif
- /* This macro indicates that the installed library is uClibc. Use
- * __UCLIBC_MAJOR__ and __UCLIBC_MINOR__ to test for the features in
- * specific releases. */
- #define __UCLIBC__ 1
- #ifdef __UCLIBC__
- /* Load up the current set of uClibc supported features along
- * with the current uClibc major and minor version numbers.
- * For uClibc release 0.9.26, these numbers would be:
- * #define __UCLIBC_MAJOR__ 0
- * #define __UCLIBC_MINOR__ 9
- * #define __UCLIBC_SUBLEVEL__ 26
- */
- # define __need_uClibc_config_h
- # include <bits/uClibc_config.h>
- # undef __need_uClibc_config_h
- /* For uClibc, always optimize for size -- this should disable
- * a lot of expensive inlining...
- * TODO: this is wrong! __OPTIMIZE_SIZE__ is an indicator of
- * gcc -Os compile. We should not mess with compiler inlines.
- * We should instead disable __USE_EXTERN_INLINES unconditionally,
- * or maybe actually audit and test uclibc to work correctly
- * with __USE_EXTERN_INLINES on.
- */
- # define __OPTIMIZE_SIZE__ 1
- /* disable unsupported features */
- # undef __LDBL_COMPAT
- /* no support for FORTIFY */
- # undef _FORTIFY_SOURCE
- # ifndef __UCLIBC_HAS_THREADS__
- # if defined _REENTRANT || defined _THREAD_SAFE
- # warning requested reentrant code, but thread support was disabled
- # undef _REENTRANT
- # undef _THREAD_SAFE
- # endif
- # endif
- #endif /* __UCLIBC__ */
- /* If nothing (other than _GNU_SOURCE) is defined,
- define _BSD_SOURCE and _SVID_SOURCE. */
- #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
- !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
- !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
- !defined _BSD_SOURCE && !defined _SVID_SOURCE)
- # define _BSD_SOURCE 1
- # define _SVID_SOURCE 1
- #endif
- /* This is to enable the ISO C11 extension. */
- #if (defined _ISOC11_SOURCE \
- || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))
- # define __USE_ISOC11 1
- #endif
- /* This is to enable the ISO C99 extension. */
- #if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \
- || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
- # define __USE_ISOC99 1
- #endif
- /* This is to enable the ISO C90 Amendment 1:1995 extension. */
- #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
- || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L))
- # define __USE_ISOC95 1
- #endif
- /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
- (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
- #if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \
- !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE)
- # define _POSIX_SOURCE 1
- # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
- # define _POSIX_C_SOURCE 2
- # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600
- # define _POSIX_C_SOURCE 199506L
- # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700
- # define _POSIX_C_SOURCE 200112L
- # else
- # define _POSIX_C_SOURCE 200809L
- # endif
- # define __USE_POSIX_IMPLICITLY 1
- #endif
- #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
- # define __USE_POSIX 1
- #endif
- #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
- # define __USE_POSIX2 1
- #endif
- #if (_POSIX_C_SOURCE - 0) >= 199309L
- # define __USE_POSIX199309 1
- #endif
- #if (_POSIX_C_SOURCE - 0) >= 199506L
- # define __USE_POSIX199506 1
- #endif
- #if (_POSIX_C_SOURCE - 0) >= 200112L
- # define __USE_XOPEN2K 1
- # undef __USE_ISOC99
- # define __USE_ISOC99 1
- #endif
- #if (_POSIX_C_SOURCE - 0) >= 200809L
- # define __USE_XOPEN2K8 1
- # undef _ATFILE_SOURCE
- # define _ATFILE_SOURCE 1
- #endif
- #ifdef _XOPEN_SOURCE
- # define __USE_XOPEN 1
- # if (_XOPEN_SOURCE - 0) >= 500
- # define __USE_XOPEN_EXTENDED 1
- # define __USE_UNIX98 1
- # undef _LARGEFILE_SOURCE
- # define _LARGEFILE_SOURCE 1
- # if (_XOPEN_SOURCE - 0) >= 600
- # if (_XOPEN_SOURCE - 0) >= 700
- # define __USE_XOPEN2K8 1
- # endif
- # define __USE_XOPEN2K 1
- # undef __USE_ISOC99
- # define __USE_ISOC99 1
- # endif
- # else
- # ifdef _XOPEN_SOURCE_EXTENDED
- # define __USE_XOPEN_EXTENDED 1
- # endif
- # endif
- #endif
- #ifdef _LARGEFILE_SOURCE
- # define __USE_LARGEFILE 1
- #endif
- #ifdef _LARGEFILE64_SOURCE
- # define __USE_LARGEFILE64 1
- #endif
- #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
- # define __USE_FILE_OFFSET64 1
- #endif
- #if defined _BSD_SOURCE || defined _SVID_SOURCE
- # define __USE_MISC 1
- #endif
- #ifdef _BSD_SOURCE
- # define __USE_BSD 1
- #endif
- #ifdef _SVID_SOURCE
- # define __USE_SVID 1
- #endif
- #ifdef _ATFILE_SOURCE
- # define __USE_ATFILE 1
- #endif
- #ifdef _GNU_SOURCE
- # define __USE_GNU 1
- #endif
- #if defined _REENTRANT || defined _THREAD_SAFE
- # define __USE_REENTRANT 1
- #endif
- /* We do support the IEC 559 math functionality, real and complex. */
- #ifdef __UCLIBC_HAS_FLOATS__
- #define __STDC_IEC_559__ 1
- #define __STDC_IEC_559_COMPLEX__ 1
- #endif
- #ifdef __UCLIBC_HAS_WCHAR__
- /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
- #define __STDC_ISO_10646__ 200009L
- #endif
- /* There is an unwholesomely huge amount of code out there that depends on the
- * presence of GNU libc header files. We have GNU libc header files. So here
- * we commit a horrible sin. At this point, we _lie_ and claim to be GNU libc
- * to make things like /usr/include/linux/socket.h and lots of apps work as
- * their developers intended. This is IMHO, pardonable, since these defines
- * are not really intended to check for the presence of a particular library,
- * but rather are used to define an _interface_. */
- #if !defined __FORCE_NOGLIBC && (!defined _LIBC || defined __FORCE_GLIBC)
- /* This macro indicates that the installed library is the GNU C Library.
- For historic reasons the value now is 6 and this will stay from now
- on. The use of this variable is deprecated. */
- /* uClibc WARNING: leave these aligned to the left, don't put a space after '#', else
- * broken apps could fail the check. */
- #undef __GNU_LIBRARY__
- #define __GNU_LIBRARY__ 6
- /* Major and minor version number of the GNU C library package. Use
- these macros to test for features in specific releases. */
- /* Don't do it, if you want to keep uClibc happy. */
- #define __GLIBC__ 2
- #define __GLIBC_MINOR__ 2
- #endif
- #define __GLIBC_PREREQ(maj, min) \
- ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
- #ifndef __UCLIBC__
- /* Decide whether a compiler supports the long long datatypes. */
- #if defined __GNUC__ \
- || (defined __PGI && defined __i386__ ) \
- || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \
- || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
- # define __GLIBC_HAVE_LONG_LONG 1
- #endif
- #endif
- /* This is here only because every header file already includes this one. */
- #ifndef __ASSEMBLER__
- # ifndef _SYS_CDEFS_H
- # include <sys/cdefs.h>
- # endif
- /* If we don't have __REDIRECT, prototypes will be missing if
- __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
- # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
- # define __USE_LARGEFILE 1
- # define __USE_LARGEFILE64 1
- # endif
- #endif /* !ASSEMBLER */
- /* Decide whether we can, and are willing to define extern inline
- * functions in headers, even if this results in a slightly bigger
- * code for user programs built against uclibc.
- * Enabled only in -O2 compiles, not -Os.
- * uclibc itself is usually built without __USE_EXTERN_INLINES,
- * remove "&& !defined __OPTIMIZE_SIZE__" part to do otherwise.
- */
- #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
- && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \
- && (defined __extern_inline || defined __GNUC_GNU_INLINE__ || defined __GNUC_STDC_INLINE__)
- # define __USE_EXTERN_INLINES 1
- #endif
- #ifdef _LIBC
- # undef _FILE_OFFSET_BITS
- # undef __USE_FILE_OFFSET64
- # include <libc-internal.h>
- #endif
- #endif /* features.h */
|