225 lines
6.4 KiB
C
225 lines
6.4 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* features.h
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* Detects the appropriate standard that this translation unit uses.
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*/
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#ifndef _INCLUDE_FEATURES_H
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#define _INCLUDE_FEATURES_H
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#define __sortix_libc__ 1
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/* Detect whether we are a core system library. */
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#if defined(__is_sortix_libc) || \
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defined(__is_sortix_libm)
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#if !defined(__is_sortix_system_library)
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#define __is_sortix_system_library
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#endif
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#endif
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/* Detect whether we are a core system component. */
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#if defined(__is_sortix_kernel) || defined(__is_sortix_system_library)
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#if !defined(__is_sortix_system_component)
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#define __is_sortix_system_component
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#endif
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#endif
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/* Support macro to ease testing the compiler version. */
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#define __GCC_PREREQ(gcc_major, gcc_minor) \
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(((gcc_major) == __GNUC__ && (gcc_minor) >= __GNUC_MINOR__) || \
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((gcc_major) < __GNUC__))
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/* Sortix system components implicitly use the native API. */
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#if defined(__is_sortix_system_component) && !defined(_SORTIX_SOURCE)
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#define _SORTIX_SOURCE 1
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#endif
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/* These macros are used internally by the standard library to decide which
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symbols are provided by the standard library headers. They are always defined
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and have a value of zero if the feature is not activated. */
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#undef __USE_C
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#undef __USE_POSIX
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#undef __USE_XOPEN
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#undef __USE_SORTIX
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/* Determine if all symbols should be visible in an effort to be as compatible
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as possible, even if the Sortix API doesn't have them in these places. */
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#if defined(_ALL_SOURCE)
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#if !defined(_C11_SOURCE)
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#define _C11_SOURCE
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#endif
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#if !defined(_POSIX_C_SOURCE)
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#define _POSIX_C_SOURCE 200809L
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#endif
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#if !defined(_XOPEN_SOURCE)
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#define _XOPEN_SOURCE 700
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#endif
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#if !defined(_SORTIX_SOURCE)
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#define _SORTIX_SOURCE 1
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#define __IMPLICIT_SORTIX_SOURCE
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#endif
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#endif
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/* Default to the native API if no other base feature macros is defined. */
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#if !defined(__STRICT_ANSI__) && \
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!defined(_ANSI_SOURCE) && \
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!defined(_ISOC99_SOURCE) && \
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!defined(_ISOC11_SOURCE) && \
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!defined(_XOPEN_SOURCE) && \
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!defined(_POSIX_SOURCE) && \
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!defined(_POSIX_C_SOURCE) && \
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!defined(_ALL_SOURCE) && \
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!defined(_SORTIX_SOURCE) && \
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!defined(_DEFAULT_SOURCE)
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#define _DEFAULT_SOURCE 1
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#endif
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/* Use the Sortix API if the default API was requested. */
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#if defined(_DEFAULT_SOURCE) && !defined(_SORTIX_SOURCE)
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#define _SORTIX_SOURCE 1
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#define __IMPLICIT_SORTIX_SOURCE
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#endif
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/* Particular XSI revisions imply certain POSIX revisions. */
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#if defined(_XOPEN_SOURCE)
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#if 700 <= _XOPEN_SOURCE - 0
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200809L
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#elif 600 <= _XOPEN_SOURCE - 0
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200112L
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#elif 520 <= _XOPEN_SOURCE - 0
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 199506L
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#elif 500 <= _XOPEN_SOURCE - 0
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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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#endif
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/* C89 is always visible. */
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#define __USE_C 1989
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/* Determine if C90 Amendment 1:1995 is visible. */
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#if defined(__STDC_VERSION__) && 199409L <= __STDC_VERSION__
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#undef __USE_C
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#define __USE_C 1995
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#endif
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/* Determine if C99 is visible. */
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#if defined(_ISOC99_SOURCE) || \
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(defined(__STDC_VERSION__) && 199901L <= __STDC_VERSION__) || \
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(defined(__cplusplus) && 201103L <= __cplusplus)
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#undef __USE_C
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#define __USE_C 1999
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#endif
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/* Determine if C11 is visible. */
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#if defined(_ISOC11_SOURCE) || \
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(defined(__STDC_VERSION__) && 201112L <= __STDC_VERSION__)
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#undef __USE_C
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#define __USE_C 2011
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#endif
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/* Determine which revision of XSI is used. */
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#if defined(_XOPEN_SOURCE)
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#if 700 <= _XOPEN_SOURCE - 0
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#define __USE_XOPEN 700
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#elif 600 <= _XOPEN_SOURCE - 0
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#define __USE_XOPEN 600
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#elif 520 <= _XOPEN_SOURCE - 0
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#define __USE_XOPEN 520
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#elif 500 <= _XOPEN_SOURCE - 0
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#define __USE_XOPEN 500
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#elif 1 == _XOPEN_SOURCE_EXTENDED - 0
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#define __USE_XOPEN 420
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#elif 4 <= _XOPEN_VERSION - 0
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#define __USE_XOPEN 400
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#else
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#define __USE_XOPEN 300
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#endif
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#else
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#define __USE_XOPEN 0
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#endif
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/* Determine which revision of POSIX is used. */
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#ifdef _POSIX_C_SOURCE
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#if 200809L <= _POSIX_C_SOURCE - 0
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#define __USE_POSIX 200809L
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#elif 200112L <= _POSIX_C_SOURCE - 0
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#define __USE_POSIX 200112L
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#elif 199506L <= _POSIX_C_SOURCE - 0
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#define __USE_POSIX 199506L
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#elif 199309L <= _POSIX_C_SOURCE - 0
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#define __USE_POSIX 199309L
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#elif 2 <= _POSIX_C_SOURCE - 0
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#define __USE_POSIX 199209L
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#else
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#define __USE_POSIX 199009L
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#endif
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#elif defined(_POSIX_SOURCE)
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#define __USE_POSIX 198808L
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#else
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#define __USE_POSIX 0
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#endif
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/* Upgrade the visible C revision in accordance with the used POSIX revision. */
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#if 200112L <= __USE_POSIX && __USE_C < 1999
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#undef __USE_C
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#define __USE_C 1999
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#elif 0 < __USE_POSIX && __USE_C < 1990
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#undef __USE_C
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#define __USE_C 1990
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#endif
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/* Determine whether the Sortix API is visible. */
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#if defined(_SORTIX_SOURCE)
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#define __USE_SORTIX 1
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#else
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#define __USE_SORTIX 0
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#endif
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/* Whether to override some "standard" functions with Sortix alternatives. */
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#if !defined(__SORTIX_STDLIB_REDIRECTS)
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#if __USE_SORTIX && !defined(__IMPLICIT_SORTIX_SOURCE)
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#define __SORTIX_STDLIB_REDIRECTS 1
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#else
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#define __SORTIX_STDLIB_REDIRECTS 0
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#endif
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#endif
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/* Provide the restrict keyword when building system components. */
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#if defined(__is_sortix_system_component) && !defined(__want_restrict)
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#define __want_restrict 1
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#endif
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/* Detect whether the restrict keyword is available. */
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#if __STDC_VERSION__ >= 199901L
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#define __HAS_RESTRICT 1
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#endif
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/* Provide the full <stdint.h> in all system components. */
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#if defined(__is_sortix_system_component)
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#undef __STDC_CONSTANT_MACROS
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#undef __STDC_FORMAT_MACROS
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#undef __STDC_LIMIT_MACROS
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#define __STDC_CONSTANT_MACROS
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#define __STDC_FORMAT_MACROS
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#define __STDC_LIMIT_MACROS
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#endif
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#endif
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