| /* Copyright (C) 1991,1992,1993,1995-2006,2007 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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 |
| _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if |
| Single Unix conformance is wanted, to 600 for the |
| upcoming sixth 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. |
| _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_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_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. |
| __FAVOR_BSD Favor 4.3BSD things in cases of conflict. |
| |
| 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_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_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 __FAVOR_BSD |
| #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 |
| |
| |
| /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ |
| #if defined _BSD_SOURCE && \ |
| !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \ |
| defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \ |
| defined _GNU_SOURCE || defined _SVID_SOURCE) |
| # define __FAVOR_BSD 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 _POSIX_SOURCE |
| # define _POSIX_SOURCE 1 |
| # undef _POSIX_C_SOURCE |
| # define _POSIX_C_SOURCE 200112L |
| # undef _XOPEN_SOURCE |
| # define _XOPEN_SOURCE 600 |
| # 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 |
| |
| /* 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 C99 extension. Also recognize the old macro |
| which was used prior to the standard acceptance. This macro will |
| eventually go away and the features enabled by default once the ISO C99 |
| standard is widely adopted. */ |
| #if (defined _ISOC99_SOURCE || defined _ISOC9X_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 |
| # else |
| # define _POSIX_C_SOURCE 200112L |
| # endif |
| #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 |
| #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 |
| # 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 |
| |
| #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \ |
| && __GNUC_PREREQ (4, 1) && defined __OPTIMIZE__ && __OPTIMIZE__ > 0 |
| # if _FORTIFY_SOURCE > 1 |
| # define __USE_FORTIFY_LEVEL 2 |
| # else |
| # define __USE_FORTIFY_LEVEL 1 |
| # endif |
| #else |
| # define __USE_FORTIFY_LEVEL 0 |
| #endif |
| |
| /* We do support the IEC 559 math functionality, real and complex. */ |
| #define __STDC_IEC_559__ 1 |
| #define __STDC_IEC_559_COMPLEX__ 1 |
| |
| /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */ |
| #define __STDC_ISO_10646__ 200009L |
| |
| /* 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. Use __GLIBC__ and |
| __GLIBC_MINOR__ now (see below) when you want to test for a specific |
| GNU C library version and use the values in <gnu/lib-names.h> to get |
| the sonames of the shared libraries. */ |
| #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. */ |
| #define __GLIBC__ 2 |
| #define __GLIBC_MINOR__ 9 |
| |
| #define __GLIBC_PREREQ(maj, min) \ |
| ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) |
| |
| /* 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 |
| |
| /* 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 define 'extern inline' functions in headers. */ |
| #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ |
| && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ |
| && defined __extern_inline |
| # define __USE_EXTERN_INLINES 1 |
| #endif |
| |
| |
| /* This is here only because every header file already includes this one. |
| Get the definitions of all the appropriate `__stub_FUNCTION' symbols. |
| <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub |
| that will always return failure (and set errno to ENOSYS). */ |
| #include <gnu/stubs.h> |
| |
| |
| #endif /* features.h */ |
