-/* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2001 Free Software Foundation, Inc.
+/* 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
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. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#ifndef _FEATURES_H
#define _FEATURES_H 1
-/* For uClibc, always optimize for size -- this should disable
- * a lot of expensive inlining... */
-#define __OPTIMIZE_SIZE__ 1
-
/* These are defined by the user (or the compiler)
to specify the desired environment:
_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 >=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
- upcoming sixth revision.
+ 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
- 199506L. If more than one of these are defined, they accumulate.
+ 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.
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_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
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_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
/* 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 && \
# undef _POSIX_SOURCE
# define _POSIX_SOURCE 1
# undef _POSIX_C_SOURCE
-# define _POSIX_C_SOURCE 199506L
+# define _POSIX_C_SOURCE 200809L
# undef _XOPEN_SOURCE
-# define _XOPEN_SOURCE 600
+# define _XOPEN_SOURCE 700
# undef _XOPEN_SOURCE_EXTENDED
# define _XOPEN_SOURCE_EXTENDED 1
# undef _LARGEFILE64_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 && \
# 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__ && !defined _POSIX_SOURCE && \
- !defined _POSIX_C_SOURCE)
+#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
-# else
+# 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_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
# 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
# define __USE_SVID 1
#endif
+#ifdef _ATFILE_SOURCE
+# define __USE_ATFILE 1
+#endif
+
#ifdef _GNU_SOURCE
# define __USE_GNU 1
#endif
# 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. */
+#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 3.0. */
+/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
#define __STDC_ISO_10646__ 200009L
#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
-
-/* 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
-
/* 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
* 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)
-# define __GNU_LIBRARY__ 6
-# define __GLIBC__ 2
-# define __GLIBC_MINOR__ 2
-#endif
+/* 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
-/* 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
+/* 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
+# 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 define 'extern inline' functions in headers. */
+/* 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 __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \
+ && (defined __extern_inline || defined __GNUC_GNU_INLINE__ || defined __GNUC_STDC_INLINE__)
# define __USE_EXTERN_INLINES 1
#endif
-
-/* Make sure users large file options agree with uClibc's configuration. */
-#ifndef __UCLIBC_HAS_LFS__
-
-/* If uClibc was built without large file support, output an error if
- * and 64-bit file offsets were requested, output an error.
- * NOTE: This is probably incorrect on a 64-bit arch... */
-#ifdef __USE_FILE_OFFSET64
-#error It appears you have defined _FILE_OFFSET_BITS=64. Unfortunately, \
-uClibc was built without large file support enabled.
-#endif
-
-/* If uClibc was built without large file support and _LARGEFILE64_SOURCE
- * is defined, undefine it. */
-#if defined(_LARGEFILE64_SOURCE)
-#undef _LARGEFILE64_SOURCE
-#undef __USE_LARGEFILE64
-#endif
-
-/* If we're actually building uClibc with large file support,
- * define __USE_LARGEFILE64 and __USE_LARGEFILE. */
-#elif defined(_LIBC)
-#undef _LARGEFILE_SOURCE
-#undef _LARGEFILE64_SOURCE
-#undef _FILE_OFFSET_BITS
-#undef __USE_LARGEFILE
-#undef __USE_LARGEFILE64
-#undef __USE_FILE_OFFSET64
-#define _LARGEFILE_SOURCE 1
-#define _LARGEFILE64_SOURCE 1
-#define __USE_LARGEFILE 1
-#define __USE_LARGEFILE64 1
-#endif
-
-/* Some nice features only work properly with ELF */
-#if defined _LIBC
-#if defined __HAVE_ELF__
-/* Define ALIASNAME as a weak alias for NAME. */
-# define weak_alias(name, aliasname) _weak_alias (name, aliasname)
-# define _weak_alias(name, aliasname) \
- extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
-/* Define ALIASNAME as a strong alias for NAME. */
-# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
-# define _strong_alias(name, aliasname) \
- extern __typeof (name) aliasname __attribute__ ((alias (#name)));
-/* This comes between the return type and function name in
- * a function definition to make that definition weak. */
-# define weak_function __attribute__ ((weak))
-# define weak_const_function __attribute__ ((weak, __const__))
-/* Tacking on "\n\t#" to the section name makes gcc put it's bogus
- * section attributes on what looks like a comment to the assembler. */
-# if defined(__cris__)
-# define link_warning(symbol, msg)
-# else
-# define link_warning(symbol, msg) \
- asm (".section " ".gnu.warning." #symbol "\n\t.previous"); \
- static const char __evoke_link_warning_##symbol[] \
- __attribute__ ((unused, section (".gnu.warning." #symbol "\n\t#"))) = msg;
-#endif
-#else /* !defined __HAVE_ELF__ */
-# define strong_alias(name, aliasname) _strong_alias (name, aliasname)
-# define weak_alias(name, aliasname) _strong_alias (name, aliasname)
-# define _strong_alias(name, aliasname) \
- __asm__(".global " __C_SYMBOL_PREFIX__ #aliasname "\n" \
- ".set " __C_SYMBOL_PREFIX__ #aliasname "," __C_SYMBOL_PREFIX__ #name);
-# define link_warning(symbol, msg) \
- asm (".stabs \"" msg "\",30,0,0,0\n\t" \
- ".stabs \"" #symbol "\",1,0,0,0\n");
-#endif
-
-#ifndef weak_function
-/* If we do not have the __attribute__ ((weak)) syntax, there is no way we
- can define functions as weak symbols. The compiler will emit a `.globl'
- directive for the function symbol, and a `.weak' directive in addition
- will produce an error from the assembler. */
-# define weak_function /* empty */
-# define weak_const_function /* empty */
-#endif
-
-/* On some platforms we can make internal function calls (i.e., calls of
- functions not exported) a bit faster by using a different calling
- convention. */
-#ifndef internal_function
-# define internal_function /* empty */
-#endif
-
-/* Prepare for the case that `__builtin_expect' is not available. */
-#if __GNUC__ == 2 && __GNUC_MINOR__ < 96
-#define __builtin_expect(x, expected_value) (x)
-#endif
-#ifndef likely
-# define likely(x) __builtin_expect((!!(x)),1)
-#endif
-#ifndef unlikely
-# define unlikely(x) __builtin_expect((!!(x)),0)
-#endif
-#ifndef __LINUX_COMPILER_H
-#define __LINUX_COMPILER_H
-#endif
-#ifndef __cast__
-#define __cast__(_to)
-#endif
-
-/* Arrange to hide uClibc internals */
-#if __GNUC_PREREQ (3, 3)
-# define attribute_hidden __attribute__ ((visibility ("hidden")))
-#else
-# define attribute_hidden
-#endif
-
-/* Pull in things like __attribute_used__ */
-#include <sys/cdefs.h>
-
-/* --- this is added to integrate linuxthreads */
-#define __USE_UNIX98 1
-
-#endif /* _LIBC only stuff */
-
-#ifndef __linux__
-# define __linux__ 1
+#ifdef _LIBC
+# ifdef __UCLIBC_HAS_LFS__
+# undef _FILE_OFFSET_BITS
+# undef __USE_FILE_OFFSET64
+# endif
+# include <libc-internal.h>
#endif
-/* Disable __user, which shows up in 2.6.x include asm headers
- * that get pulled in by signal.h */
-#define __user
-
#endif /* features.h */
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