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This incorporates: 2019-12-23 mktime, nstrftime: tweak division performance 2019-12-22 count-leading-zeros: assume 'long long' 2019-12-22 count-one-bits: assume 'long long' 2019-12-22 count-trailing-zeros: assume 'long long' 2019-12-12 inttypes-incomplete: assume 'long long' 2019-12-22 malloca: assume 'long long' 2019-12-22 stdint: assume 'long long' 2019-12-22 strtoll, strtoimax, strtoumax: assume 'long long' 2019-12-22 prefer lib_SOURCES to unconditional AC_LIBOBJ 2019-12-19 nstrftime: avoid a shadowing warning 2019-12-18 improve port of AC_C_RESTRICT to Oracle C++ 2019-12-12 stdalign: port to xlclang 16.01 2019-12-11 stddef, unistd: fix compilation error in C++ mode on MSVC 2019-12-08 fix compilation errors in C++ mode on Haiku 2019-12-08 fix compilation errors in 32-bit C++ mode on HP-UX 11/ia64 2019-12-08 fix compilation error in C++ mode on OpenBSD * build-aux/config.guess, doc/misc/texinfo.tex: * lib/count-leading-zeros.h, lib/count-one-bits.h: * lib/count-trailing-zeros.h, lib/inttypes.in.h, lib/malloca.h: * lib/mktime.c, lib/nstrftime.c, lib/signal.in.h, lib/stdalign.in.h: * lib/stddef.in.h, lib/stdint.in.h, lib/stdio.in.h, lib/stdlib.in.h: * lib/strtoimax.c, lib/unistd.in.h, m4/gnulib-common.m4: * m4/inttypes.m4, m4/largefile.m4, m4/malloca.m4, m4/strtoimax.m4: * m4/strtoll.m4: Copy from Gnulib. Also, change copyright notices in some other Gnulib-copied files to exactly match Gnulib, as Gnulib updated them in a trivially different way. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
122 lines
4.6 KiB
C++
122 lines
4.6 KiB
C++
/* A substitute for ISO C11 <stdalign.h>.
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Copyright 2011-2020 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert and Bruno Haible. */
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#ifndef _GL_STDALIGN_H
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#define _GL_STDALIGN_H
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/* ISO C11 <stdalign.h> for platforms that lack it.
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References:
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ISO C11 (latest free draft
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<http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf>)
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sections 6.5.3.4, 6.7.5, 7.15.
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C++11 (latest free draft
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<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf>)
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section 18.10. */
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/* alignof (TYPE), also known as _Alignof (TYPE), yields the alignment
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requirement of a structure member (i.e., slot or field) that is of
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type TYPE, as an integer constant expression.
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This differs from GCC's __alignof__ operator, which can yield a
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better-performing alignment for an object of that type. For
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example, on x86 with GCC, __alignof__ (double) and __alignof__
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(long long) are 8, whereas alignof (double) and alignof (long long)
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are 4 unless the option '-malign-double' is used.
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The result cannot be used as a value for an 'enum' constant, if you
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want to be portable to HP-UX 10.20 cc and AIX 3.2.5 xlc.
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Include <stddef.h> for offsetof. */
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#include <stddef.h>
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/* FreeBSD 9.1 <sys/cdefs.h>, included by <stddef.h> and lots of other
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standard headers, defines conflicting implementations of _Alignas
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and _Alignof that are no better than ours; override them. */
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#undef _Alignas
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#undef _Alignof
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/* GCC releases before GCC 4.9 had a bug in _Alignof. See GCC bug 52023
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<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>. */
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#if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \
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|| (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9)))
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# ifdef __cplusplus
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# if 201103 <= __cplusplus
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# define _Alignof(type) alignof (type)
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# else
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template <class __t> struct __alignof_helper { char __a; __t __b; };
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# define _Alignof(type) offsetof (__alignof_helper<type>, __b)
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# endif
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# else
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# define _Alignof(type) offsetof (struct { char __a; type __b; }, __b)
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# endif
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#endif
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#if ! (defined __cplusplus && 201103 <= __cplusplus)
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# define alignof _Alignof
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#endif
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#define __alignof_is_defined 1
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/* alignas (A), also known as _Alignas (A), aligns a variable or type
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to the alignment A, where A is an integer constant expression. For
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example:
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int alignas (8) foo;
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struct s { int a; int alignas (8) bar; };
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aligns the address of FOO and the offset of BAR to be multiples of 8.
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A should be a power of two that is at least the type's alignment
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and at most the implementation's alignment limit. This limit is
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2**28 on typical GNUish hosts, and 2**13 on MSVC. To be portable
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to MSVC through at least version 10.0, A should be an integer
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constant, as MSVC does not support expressions such as 1 << 3.
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To be portable to Sun C 5.11, do not align auto variables to
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anything stricter than their default alignment.
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The following C11 requirements are not supported here:
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- If A is zero, alignas has no effect.
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- alignas can be used multiple times; the strictest one wins.
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- alignas (TYPE) is equivalent to alignas (alignof (TYPE)).
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*/
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#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
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# if defined __cplusplus && 201103 <= __cplusplus
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# define _Alignas(a) alignas (a)
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# elif ((defined __APPLE__ && defined __MACH__ \
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? 4 < __GNUC__ + (1 <= __GNUC_MINOR__) \
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: __GNUC__ && !defined __ibmxl__) \
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|| (__ia64 && (61200 <= __HP_cc || 61200 <= __HP_aCC)) \
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|| __ICC || 0x590 <= __SUNPRO_C || 0x0600 <= __xlC__)
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# define _Alignas(a) __attribute__ ((__aligned__ (a)))
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# elif 1300 <= _MSC_VER
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# define _Alignas(a) __declspec (align (a))
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# endif
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#endif
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#if ((defined _Alignas && ! (defined __cplusplus && 201103 <= __cplusplus)) \
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|| (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__))
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# define alignas _Alignas
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#endif
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#if defined alignas || (defined __cplusplus && 201103 <= __cplusplus)
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# define __alignas_is_defined 1
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#endif
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#endif /* _GL_STDALIGN_H */
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