X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gnu%2Fstdalign.in.h;fp=gnu%2Fstdalign.in.h;h=7256ede92ebe608ec599fa290fc68bb8a4e2c400;hb=daa269958ad8d50ef8154ccb65e58acaf7a6dd99;hp=0000000000000000000000000000000000000000;hpb=1a44d77d50f4fb37c0410eed04b82303624ea2ec;p=debian%2Ftar diff --git a/gnu/stdalign.in.h b/gnu/stdalign.in.h new file mode 100644 index 00000000..7256ede9 --- /dev/null +++ b/gnu/stdalign.in.h @@ -0,0 +1,92 @@ +/* -*- buffer-read-only: t -*- vi: set ro: */ +/* DO NOT EDIT! GENERATED AUTOMATICALLY! */ +/* A substitute for ISO C11 . + + Copyright 2011-2013 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, see . */ + +/* Written by Paul Eggert and Bruno Haible. */ + +#ifndef _GL_STDALIGN_H +#define _GL_STDALIGN_H + +/* ISO C11 for platforms that lack it. + + References: + ISO C11 (latest free draft + ) + sections 6.5.3.4, 6.7.5, 7.15. + C++11 (latest free draft + ) + section 18.10. */ + +/* alignof (TYPE), also known as _Alignof (TYPE), yields the alignment + requirement of a structure member (i.e., slot or field) that is of + type TYPE, as an integer constant expression. + + This differs from GCC's __alignof__ operator, which can yield a + better-performing alignment for an object of that type. For + example, on x86 with GCC, __alignof__ (double) and __alignof__ + (long long) are 8, whereas alignof (double) and alignof (long long) + are 4 unless the option '-malign-double' is used. + + The result cannot be used as a value for an 'enum' constant, if you + want to be portable to HP-UX 10.20 cc and AIX 3.2.5 xlc. */ +#include +#if defined __cplusplus + template struct __alignof_helper { char __a; __t __b; }; +# define _Alignof(type) offsetof (__alignof_helper, __b) +#else +# define _Alignof(type) offsetof (struct { char __a; type __b; }, __b) +#endif +#define alignof _Alignof +#define __alignof_is_defined 1 + +/* alignas (A), also known as _Alignas (A), aligns a variable or type + to the alignment A, where A is an integer constant expression. For + example: + + int alignas (8) foo; + struct s { int a; int alignas (8) bar; }; + + aligns the address of FOO and the offset of BAR to be multiples of 8. + + A should be a power of two that is at least the type's alignment + and at most the implementation's alignment limit. This limit is + 2**28 on typical GNUish hosts, and 2**13 on MSVC. To be portable + to MSVC through at least version 10.0, A should be an integer + constant, as MSVC does not support expressions such as 1 << 3. + To be portable to Sun C 5.11, do not align auto variables to + anything stricter than their default alignment. + + The following C11 requirements are not supported here: + + - If A is zero, alignas has no effect. + - alignas can be used multiple times; the strictest one wins. + - alignas (TYPE) is equivalent to alignas (alignof (TYPE)). + + */ + +#if __GNUC__ || __IBMC__ || __IBMCPP__ || 0x5110 <= __SUNPRO_C +# define _Alignas(a) __attribute__ ((__aligned__ (a))) +#elif 1300 <= _MSC_VER +# define _Alignas(a) __declspec (align (a)) +#endif +#ifdef _Alignas +# define alignas _Alignas +# define __alignas_is_defined 1 +#endif + +#endif /* _GL_STDALIGN_H */