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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, see

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<http://www.gnu.org/licenses/>. */

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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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_ISOC11_SOURCE Extensions to ISO C99 from ISO C11.

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__STDC_WANT_LIB_EXT2__

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Extensions to ISO C99 from TR 27431-2:2010.

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__STDC_WANT_IEC_60559_BFP_EXT__

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Extensions to ISO C11 from TS 18661-1:2014.

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__STDC_WANT_IEC_60559_FUNCS_EXT__

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Extensions to ISO C11 from TS 18661-4:2015.

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__STDC_WANT_IEC_60559_TYPES_EXT__

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Extensions to ISO C11 from TS 18661-3:2015.

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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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_ATFILE_SOURCE Additional *at interfaces.

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_GNU_SOURCE All of the above, plus GNU extensions.

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_DEFAULT_SOURCE The default set of features (taking precedence over

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__STRICT_ANSI__).

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_FORTIFY_SOURCE Add security hardening to many library functions.

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Set to 1 or 2; 2 performs stricter checks than 1.

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_REENTRANT, _THREAD_SAFE

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Obsolete; equivalent to _POSIX_C_SOURCE=199506L.

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The `-ansi' switch to the GNU C compiler, and standards conformance

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options such as `-std=c99', define __STRICT_ANSI__. If none of

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these are defined, or if _DEFAULT_SOURCE is defined, the default is

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to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to

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200809L, as well as enabling miscellaneous functions from BSD and

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SVID. If more than one of these are defined, they accumulate. For

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example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE together

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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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__GLIBC_USE (F) Define things from feature set F. This is defined

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to 1 or 0; the subsequent macros are either defined

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or undefined, and those tests should be moved to

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__GLIBC_USE.

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__USE_ISOC11 Define ISO C11 things.

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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_ISOCXX11 Define ISO C++11 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_XOPEN2KXSI Define XPG6 XSI things.

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__USE_XOPEN2K8 Define XPG7 things.

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__USE_XOPEN2K8XSI Define XPG7 XSI 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_MISC Define things from 4.3BSD or 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_FORTIFY_LEVEL Additional security measures used, according to level.

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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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ISO C feature test macros depend on the definition of the macro

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when an affected header is included, not when the first system

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header is included, and so they are handled in

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<bits/libc-header-start.h>, which does not have a multiple include

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guard. Feature test macros that can be handled from the first

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system header included are handled here. */

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/* Undefine everything, so we get a clean slate. */

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#undef __USE_ISOC11

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#undef __USE_ISOC99

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#undef __USE_ISOC95

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#undef __USE_ISOCXX11

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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_XOPEN2KXSI

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#undef __USE_XOPEN2K8

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#undef __USE_XOPEN2K8XSI

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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_MISC

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#undef __USE_ATFILE

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#undef __USE_GNU

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#undef __USE_FORTIFY_LEVEL

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#undef __KERNEL_STRICT_NAMES

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#undef __GLIBC_USE_DEPRECATED_GETS

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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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/* Convenience macro to test the version of gcc.

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Use 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: only works for GCC 2.0 and later, because __GNUC_MINOR__ was

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added in 2.0. */

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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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/* Similarly for clang. Features added to GCC after version 4.2 may

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or may not also be available in clang, and clang's definitions of

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__GNUC(_MINOR)__ are fixed at 4 and 2 respectively. Not all such

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features can be queried via __has_extension/__has_feature. */

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#if defined __clang_major__ && defined __clang_minor__

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# define __glibc_clang_prereq(maj, min) \

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((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))

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#else

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# define __glibc_clang_prereq(maj, min) 0

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#endif

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/* Whether to use feature set F. */

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#define __GLIBC_USE(F) __GLIBC_USE_ ## F

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/* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for

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_DEFAULT_SOURCE. If _DEFAULT_SOURCE is present we do not

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issue a warning; the expectation is that the source is being

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transitioned to use the new macro. */

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#if (defined _BSD_SOURCE || defined _SVID_SOURCE) \

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&& !defined _DEFAULT_SOURCE

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# warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"

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# undef _DEFAULT_SOURCE

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# define _DEFAULT_SOURCE 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 _ISOC95_SOURCE

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# define _ISOC95_SOURCE 1

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# undef _ISOC99_SOURCE

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# define _ISOC99_SOURCE 1

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# undef _ISOC11_SOURCE

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# define _ISOC11_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 _DEFAULT_SOURCE

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# define _DEFAULT_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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/* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined,

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define _DEFAULT_SOURCE. */

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#if (defined _DEFAULT_SOURCE \

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|| (!defined __STRICT_ANSI__ \

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&& !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE \

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&& !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE \

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&& !defined _XOPEN_SOURCE))

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# undef _DEFAULT_SOURCE

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# define _DEFAULT_SOURCE 1

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#endif

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/* This is to enable the ISO C11 extension. */

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#if (defined _ISOC11_SOURCE \

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|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))

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# define __USE_ISOC11 1

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#endif

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/* This is to enable the ISO C99 extension. */

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#if (defined _ISOC99_SOURCE || defined _ISOC11_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 _ISOC11_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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#ifdef __cplusplus

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/* This is to enable compatibility for ISO C++17. */

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# if __cplusplus >= 201703L

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# define __USE_ISOC11 1

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# endif

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/* This is to enable compatibility for ISO C++11.

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Check the temporary macro for now, too. */

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# if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__

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# define __USE_ISOCXX11 1

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# define __USE_ISOC99 1

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# endif

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#endif

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/* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE

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is defined, use POSIX.1-2008 (or another version depending on

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_XOPEN_SOURCE). */

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#ifdef _DEFAULT_SOURCE

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# if !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE

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# define __USE_POSIX_IMPLICITLY 1

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# endif

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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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#endif

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#if ((!defined __STRICT_ANSI__ \

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|| (defined _XOPEN_SOURCE && (_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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/* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be

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defined in all multithreaded code. GNU libc has not required this

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for many years. We now treat them as compatibility synonyms for

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_POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with

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comprehensive support for multithreaded code. Using them never

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lowers the selected level of POSIX conformance, only raises it. */

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#if ((!defined _POSIX_C_SOURCE || (_POSIX_C_SOURCE - 0) < 199506L) \

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&& (defined _REENTRANT || defined _THREAD_SAFE))

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# define _POSIX_SOURCE 1

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# undef _POSIX_C_SOURCE

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# define _POSIX_C_SOURCE 199506L

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#endif

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#if (defined _POSIX_SOURCE \

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|| (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1) \

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|| 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 defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L

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# define __USE_POSIX199309 1

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#endif

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#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L

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# define __USE_POSIX199506 1

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#endif

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#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L

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# define __USE_XOPEN2K 1

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# undef __USE_ISOC95

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# define __USE_ISOC95 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 defined _POSIX_C_SOURCE && (_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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# define __USE_XOPEN2K8XSI 1

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# endif

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# define __USE_XOPEN2K 1

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# define __USE_XOPEN2KXSI 1

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# undef __USE_ISOC95

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# define __USE_ISOC95 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 _DEFAULT_SOURCE

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# define __USE_MISC 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 _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0

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# if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0

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# warning _FORTIFY_SOURCE requires compiling with optimization (-O)

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# elif !__GNUC_PREREQ (4, 1)

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# warning _FORTIFY_SOURCE requires GCC 4.1 or later

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# elif _FORTIFY_SOURCE > 2 && (__glibc_clang_prereq (9, 0) \

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|| __GNUC_PREREQ (12, 0))

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# if _FORTIFY_SOURCE > 3

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# warning _FORTIFY_SOURCE > 3 is treated like 3 on this platform

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# endif

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# define __USE_FORTIFY_LEVEL 3

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# elif _FORTIFY_SOURCE > 1

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# if _FORTIFY_SOURCE > 2

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# warning _FORTIFY_SOURCE > 2 is treated like 2 on this platform

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# endif

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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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#endif

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#ifndef __USE_FORTIFY_LEVEL

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# define __USE_FORTIFY_LEVEL 0

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#endif

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/* The function 'gets' existed in C89, but is impossible to use

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safely. It has been removed from ISO C11 and ISO C++14. Note: for

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compatibility with various implementations of <cstdio>, this test

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must consider only the value of __cplusplus when compiling C++. */

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#if defined __cplusplus ? __cplusplus >= 201402L : defined __USE_ISOC11

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# define __GLIBC_USE_DEPRECATED_GETS 0

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#else

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# define __GLIBC_USE_DEPRECATED_GETS 1

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#endif

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/* Get definitions of __STDC_* predefined macros, if the compiler has

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not preincluded this header automatically. */

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#include <stdc-predef.h>

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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. Use __GLIBC__ and

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__GLIBC_MINOR__ now (see below) when you want to test for a specific

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GNU C library version and use the values in <gnu/lib-names.h> to get

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the sonames of the shared libraries. */

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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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#define __GLIBC__ 2

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#define __GLIBC_MINOR__ 28

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#define __GLIBC_PREREQ(maj, min) \

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((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))

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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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# define __USE_LARGEFILE64 1

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# endif

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#endif /* !ASSEMBLER */

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/* Decide whether we can define 'extern inline' functions in headers. */

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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

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# define __USE_EXTERN_INLINES 1

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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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Get the definitions of all the appropriate `__stub_FUNCTION' symbols.

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<gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub

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that will always return failure (and set errno to ENOSYS). */

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#include <gnu/stubs.h>

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#endif /* features.h */

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