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163 lines
4.2 KiB
C
163 lines
4.2 KiB
C
#ifndef PSTDALIGN_H
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#define PSTDALIGN_H
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/*
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* NOTE: aligned_alloc is defined via paligned_alloc.h
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* and requires aligned_free to be fully portable although
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* free also works on C11 and platforms with posix_memalign.
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*
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* NOTE: C++11 defines alignas as a keyword but then also defines
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* __alignas_is_defined.
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*
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* C++14 does not define __alignas_is_defined, at least sometimes.
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*
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* GCC 8.3 reverts on this and makes C++11 behave the same as C++14
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* preventing a simple __cplusplus version check from working.
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*
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* Clang C++ without std=c++11 or std=c++14 does define alignas
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* but does so incorrectly wrt. C11 and C++11 semantics because
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* `alignas(4) float x;` is not recognized.
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* To fix such issues, either move to a std version, or
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* include a working stdalign.h for the given compiler before
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* this file.
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*
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* newlib defines _Alignas and _Alignof in sys/cdefs but rely on
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* gcc version for <stdaligh.h> which can lead to conflicts if
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* stdalign is not included.
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*
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* newlibs need for <stdalign.h> conflicts with broken C++ stdalign
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* but this can be fixed be using std=C++11 or newer.
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*
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* MSVC does not support <stdalign.h> at least up to MSVC 2015,
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* but does appear to support alignas and alignof keywords in
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* recent standard C++.
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*
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* TCC only supports alignas with a numeric argument like
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* `alignas(4)`, but not `alignas(float)`.
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*
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* If stdalign.h is supported but heuristics in this file are
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* insufficient to detect this, try including <stdaligh.h> manually
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* or define HAVE_STDALIGN_H.
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*/
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/* https://github.com/dvidelabs/flatcc/issues/130 */
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#ifndef __alignas_is_defined
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#if defined(__cplusplus)
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#if __cplusplus == 201103 && !defined(__clang__) && ((__GNUC__ > 8) || (__GNUC__ == 8 && __GNUC_MINOR__ >= 3))
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#define __alignas_is_defined 1
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#define __alignof_is_defined 1
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#include <stdalign.h>
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#endif
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#endif
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#endif
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/* Allow for alternative solution to be included first. */
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#ifndef __alignas_is_defined
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#ifdef __cplusplus
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#if defined(PORTABLE_PATCH_CPLUSPLUS_STDALIGN)
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#include <stdalign.h>
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#undef alignas
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#define alignas(t) __attribute__((__aligned__(t)))
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#endif
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#endif
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#if !defined(PORTABLE_HAS_INCLUDE_STDALIGN)
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#if defined(__has_include)
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#if __has_include(<stdalign.h>)
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#define PORTABLE_HAS_INCLUDE_STDALIGN 1
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#else
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#define PORTABLE_HAS_INCLUDE_STDALIGN 0
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#endif
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#endif
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#endif
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/* https://lists.gnu.org/archive/html/bug-gnulib/2015-08/msg00003.html */
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#if defined(__cplusplus)
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#if !defined(_MSC_VER)
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#include <stdalign.h>
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#endif
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#if __cplusplus > 201103
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#define __alignas_is_defined 1
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#define __alignof_is_defined 1
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#endif
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#elif PORTABLE_HAS_INCLUDE_STDALIGN
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#include <stdalign.h>
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#elif !defined(__clang__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
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#include <stdalign.h>
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#elif defined(HAVE_STDALIGN_H)
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#include <stdaligh.h>
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#endif
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#endif /* __alignas_is_defined */
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#ifndef __alignas_is_defined
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if (!defined(__clang__) && defined(__GNUC__) && \
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((__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)))
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#undef PORTABLE_C11_STDALIGN_MISSING
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#define PORTABLE_C11_STDALIGN_MISSING
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#endif
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#if defined(__IBMC__)
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#undef PORTABLE_C11_STDALIGN_MISSING
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#define PORTABLE_C11_STDALIGN_MISSING
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#endif
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#if ((defined(__STDC__) && __STDC__ && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) && \
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!defined(PORTABLE_C11_STDALIGN_MISSING))
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/* C11 or newer */
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#include <stdalign.h>
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#else
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#if defined(__GNUC__) || defined(__IBM_ALIGNOF__) || defined(__clang__)
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#ifndef _Alignas
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#define _Alignas(t) __attribute__((__aligned__(t)))
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#endif
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#ifndef _Alignof
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#define _Alignof(t) __alignof__(t)
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#endif
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#elif defined(_MSC_VER)
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#define _Alignas(t) __declspec (align(t))
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#define _Alignof(t) __alignof(t)
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#elif defined(__TINYC__)
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/* Supports `_Alignas(integer-expression)`, but not `_Alignas(type)`. */
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#define _Alignas(t) __attribute__(aligned(t))
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#define _Alignof(t) __alignof__(t)
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#else
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#error please update pstdalign.h with support for current compiler and library
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#endif
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#endif /* __STDC__ */
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#ifndef alignas
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#define alignas _Alignas
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#endif
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#ifndef alignof
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#define alignof _Alignof
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#endif
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#define __alignas_is_defined 1
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#define __alignof_is_defined 1
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#ifdef __cplusplus
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}
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#endif
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#endif /* __alignas__is_defined */
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#include "paligned_alloc.h"
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#endif /* PSTDALIGN_H */
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