mirror of
https://codeberg.org/ziglang/zig.git
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Alex Rønne Petersen
223 lines
8.4 KiB
C
Vendored
223 lines
8.4 KiB
C
Vendored
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Berkeley Software Design, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SYS__VISIBLE_H_
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#define _SYS__VISIBLE_H_
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/*-
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* The following definitions are an extension of the behavior originally
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* implemented in <sys/_posix.h>, but with a different level of granularity.
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* POSIX.1 requires that the macros we test be defined before any standard
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* header file is included.
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*
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* Here's a quick run-down of the versions (and some informal names)
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* defined(_POSIX_SOURCE) 1003.1-1988
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* encoded as 198808 below
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* _POSIX_C_SOURCE == 1 1003.1-1990
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* encoded as 199009 below
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* _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
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* encoded as 199209 below
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* _POSIX_C_SOURCE == 199309 1003.1b-1993
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* (1003.1 Issue 4, Single Unix Spec v1, Unix 93)
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* _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
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* and the omnibus ISO/IEC 9945-1: 1996
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* (1003.1 Issue 5, Single Unix Spec v2, Unix 95)
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* _POSIX_C_SOURCE == 200112 1003.1-2001 (1003.1 Issue 6, Unix 03)
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* with _XOPEN_SOURCE=600
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* _POSIX_C_SOURCE == 200809 1003.1-2008 (1003.1 Issue 7)
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* IEEE Std 1003.1-2017 (Rev of 1003.1-2008) is
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* 1003.1-2008 with two TCs applied and
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* _XOPEN_SOURCE=700
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* _POSIX_C_SOURCE == 202405 1003.1-2004 (1003.1 Issue 8), IEEE Std 1003.1-2024
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* with _XOPEN_SOURCE=800
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*
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* In addition, the X/Open Portability Guide, which is now the Single UNIX
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* Specification, defines a feature-test macro which indicates the version of
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* that specification, and which subsumes _POSIX_C_SOURCE.
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*
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* Our macros begin with two underscores to avoid namespace screwage.
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*/
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/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
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#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
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#undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
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#define _POSIX_C_SOURCE 199009
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#endif
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/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
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#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 199209
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#endif
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/*
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* Deal with various X/Open Portability Guides and Single UNIX Spec. We use the
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* '- 0' construct so software that defines _XOPEN_SOURCE to nothing doesn't
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* cause errors. X/Open CAE Specification, August 1994, System Interfaces and
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* Headers, Issue 4, Version 2 section 2.2 states an empty definition means the
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* same thing as _POSIX_C_SOURCE == 2. This broadly mirrors "System V Interface
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* Definition, Fourth Edition", but earlier editions suggest some ambiguity.
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* However, FreeBSD has histoically implemented this as a NOP, so we just
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* document what it should be for now to not break ports gratuitously.
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*/
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#ifdef _XOPEN_SOURCE
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#if _XOPEN_SOURCE - 0 >= 800
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#define __XSI_VISIBLE 800
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 202405
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#elif _XOPEN_SOURCE - 0 >= 700
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#define __XSI_VISIBLE 700
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200809
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#elif _XOPEN_SOURCE - 0 >= 600
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#define __XSI_VISIBLE 600
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200112
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#elif _XOPEN_SOURCE - 0 >= 500
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#define __XSI_VISIBLE 500
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 199506
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#else
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/* #define _POSIX_C_SOURCE 199209 */
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#endif
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#endif
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/*
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* Deal with all versions of POSIX. The ordering relative to the tests above is
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* important.
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*/
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#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
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#define _POSIX_C_SOURCE 198808
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#endif
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#ifdef _POSIX_C_SOURCE
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#if _POSIX_C_SOURCE >= 202405
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#define __POSIX_VISIBLE 202405
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#define __ISO_C_VISIBLE 2017
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#elif _POSIX_C_SOURCE >= 200809
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#define __POSIX_VISIBLE 200809
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#define __ISO_C_VISIBLE 1999
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#elif _POSIX_C_SOURCE >= 200112
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#define __POSIX_VISIBLE 200112
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#define __ISO_C_VISIBLE 1999
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#elif _POSIX_C_SOURCE >= 199506
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#define __POSIX_VISIBLE 199506
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#define __ISO_C_VISIBLE 1990
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#elif _POSIX_C_SOURCE >= 199309
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#define __POSIX_VISIBLE 199309
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#define __ISO_C_VISIBLE 1990
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#elif _POSIX_C_SOURCE >= 199209
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#define __POSIX_VISIBLE 199209
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#define __ISO_C_VISIBLE 1990
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#elif _POSIX_C_SOURCE >= 199009
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#define __POSIX_VISIBLE 199009
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#define __ISO_C_VISIBLE 1990
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#else
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#define __POSIX_VISIBLE 198808
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#define __ISO_C_VISIBLE 0
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#endif /* _POSIX_C_SOURCE */
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/*
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* When we've explicitly asked for a newer C version, make the C variable
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* visible by default. Also honor the glibc _ISOC{11,23}_SOURCE macros
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* extensions. Both glibc and OpenBSD do this, even when a more strict
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* _POSIX_C_SOURCE has been requested, and it makes good sense (especially for
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* pre POSIX 2024, since C11 is much nicer than the old C99 base). Continue the
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* practice with C23, though don't do older standards. Also, GLIBC doesn't have
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* a _ISOC17_SOURCE, so it's not implemented here. glibc has earlier ISOCxx defines,
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* but we don't implement those as they are not relevant enough.
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*/
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#if _ISOC23_SOURCE || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
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#undef __ISO_C_VISIBLE
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#define __ISO_C_VISIBLE 2023
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#elif _ISOC11_SOURCE || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L)
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#undef __ISO_C_VISIBLE
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#define __ISO_C_VISIBLE 2011
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#endif
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#else /* _POSIX_C_SOURCE */
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/*-
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* Deal with _ANSI_SOURCE:
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* If it is defined, and no other compilation environment is explicitly
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* requested, then define our internal feature-test macros to zero. This
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* makes no difference to the preprocessor (undefined symbols in preprocessing
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* expressions are defined to have value zero), but makes it more convenient for
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* a test program to print out the values.
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*
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* If a program mistakenly defines _ANSI_SOURCE and some other macro such as
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* _POSIX_C_SOURCE, we will assume that it wants the broader compilation
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* environment (and in fact we will never get here).
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*/
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#if defined(_ANSI_SOURCE) /* Hide almost everything. */
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#define __POSIX_VISIBLE 0
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#define __XSI_VISIBLE 0
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#define __BSD_VISIBLE 0
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#define __ISO_C_VISIBLE 1990
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#define __EXT1_VISIBLE 0
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#elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
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#define __POSIX_VISIBLE 0
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#define __XSI_VISIBLE 0
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#define __BSD_VISIBLE 0
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#define __ISO_C_VISIBLE 1999
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#define __EXT1_VISIBLE 0
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#elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
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#define __POSIX_VISIBLE 0
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#define __XSI_VISIBLE 0
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#define __BSD_VISIBLE 0
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#define __ISO_C_VISIBLE 2011
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#define __EXT1_VISIBLE 0
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#elif defined(_C23_SOURCE) /* Localism to specify strict C23 env. */
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#define __POSIX_VISIBLE 0
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#define __XSI_VISIBLE 0
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#define __BSD_VISIBLE 0
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#define __ISO_C_VISIBLE 2023
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#define __EXT1_VISIBLE 0
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#else /* Default environment: show everything. */
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#define __POSIX_VISIBLE 202405
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#define __XSI_VISIBLE 800
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#define __BSD_VISIBLE 1
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#define __ISO_C_VISIBLE 2023
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#define __EXT1_VISIBLE 1
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#endif
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#endif /* _POSIX_C_SOURCE */
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/* User override __EXT1_VISIBLE */
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#if defined(__STDC_WANT_LIB_EXT1__)
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#undef __EXT1_VISIBLE
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#if __STDC_WANT_LIB_EXT1__
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#define __EXT1_VISIBLE 1
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#else
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#define __EXT1_VISIBLE 0
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#endif
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#endif /* __STDC_WANT_LIB_EXT1__ */
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#endif /* !_SYS__VISIBLE_H_ */ |