+/* Copyright (C) 1991-1993,1995-2006,2007,2009 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-#ifndef __FEATURES_H
-#define __FEATURES_H
+ 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.
-/* Major and minor version number of the uCLibc library package. Use
- these macros to test for features in specific releases. */
-#define __UCLIBC__ 0
-#define __UCLIBC_MAJOR__ 9
-#define __UCLIBC_MINOR__ 1
+ 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.
+ _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_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.
+ __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_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 __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 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
+
+# ifndef __UCLIBC_HAS_FORTIFY__
+# undef _FORTIFY_SOURCE
+# endif
+
+# 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
+
+# ifndef __UCLIBC_HAS_LFS__
+# undef _LARGEFILE64_SOURCE
+/* NOTE: This is probably incorrect on a 64-bit arch... */
+# if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
+# error It appears you have defined _FILE_OFFSET_BITS=64. Unfortunately, \
+uClibc was built without large file support enabled.
+# endif
+# elif defined __BCC__
+# error BCC does not support LFS, please disable it
+# 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 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
-/* Make a half-hearted attempt to accomodate non-gcc compilers */
-#ifndef __GNUC__
-#define __attribute(foo) /* Ignore */
+/* 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
-/* __restrict is known in EGCS 1.2 and above. */
-#if !defined __GNUC__ || __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 92)
-# define __restrict /* Ignore */
+#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
-#ifdef __STDC__
+#if defined _BSD_SOURCE || defined _SVID_SOURCE
+# define __USE_MISC 1
+#endif
-#define __P(x) x
-#define __const const
+#ifdef _BSD_SOURCE
+# define __USE_BSD 1
+#endif
-/* Almost ansi */
-#if __STDC__ != 1
-#define const
-#define volatile
+#ifdef _SVID_SOURCE
+# define __USE_SVID 1
#endif
-#else /* K&R */
+#ifdef _ATFILE_SOURCE
+# define __USE_ATFILE 1
+#endif
-#define __P(x) ()
-#define __const
-#define const
-#define volatile
+#ifdef _GNU_SOURCE
+# define __USE_GNU 1
+#endif
+#if defined _REENTRANT || defined _THREAD_SAFE
+# define __USE_REENTRANT 1
#endif
-/* No C++ */
-#define __BEGIN_DECLS
-#define __END_DECLS
+#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
-/* GNUish things */
-#define __CONSTVALUE
-#define __CONSTVALUE2
+/* 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
-#define __USE_BSD
-#define __USE_MISC
-#define __USE_POSIX
-#define __USE_POSIX2
-#define _POSIX_THREAD_SAFE_FUNCTIONS
+#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
-#include <sys/cdefs.h>
+/* 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
+# ifdef __UCLIBC_HAS_LFS__
+# define __USE_LARGEFILE64 1
+# endif
+# 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
+# ifdef __UCLIBC_HAS_LFS__
+# undef _FILE_OFFSET_BITS
+# undef __USE_FILE_OFFSET64
+# endif
+# include <libc-internal.h>
#endif
+#endif /* features.h */
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