From 8ffec2a3aba6f114784e11f89ef1d57a096ae540 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 19:39:29 +0200 Subject: Adding upstream version 8.32. Signed-off-by: Daniel Baumann --- lib/alignof.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 lib/alignof.h (limited to 'lib/alignof.h') diff --git a/lib/alignof.h b/lib/alignof.h new file mode 100644 index 0000000..17a80ff --- /dev/null +++ b/lib/alignof.h @@ -0,0 +1,50 @@ +/* Determine alignment of types. + Copyright (C) 2003-2004, 2006, 2009-2020 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 . */ + +#ifndef _ALIGNOF_H +#define _ALIGNOF_H + +#include + +/* alignof_slot (TYPE) + Determine the alignment of a structure slot (field) of a given type, + at compile time. Note that the result depends on the ABI. + This is the same as alignof (TYPE) and _Alignof (TYPE), defined in + if __alignof_is_defined is 1. + Note: The result cannot be used as a value for an 'enum' constant, + due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */ +#if defined __cplusplus + template struct alignof_helper { char __slot1; type __slot2; }; +# define alignof_slot(type) offsetof (alignof_helper, __slot2) +#else +# define alignof_slot(type) offsetof (struct { char __slot1; type __slot2; }, __slot2) +#endif + +/* alignof_type (TYPE) + Determine the good alignment of an object of the given type at compile time. + Note that this is not necessarily the same as alignof_slot(type). + For example, with GNU C on x86 platforms: alignof_type(double) = 8, but + - when -malign-double is not specified: alignof_slot(double) = 4, + - when -malign-double is specified: alignof_slot(double) = 8. + Note: The result cannot be used as a value for an 'enum' constant, + due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */ +#if defined __GNUC__ || defined __IBM__ALIGNOF__ +# define alignof_type __alignof__ +#else +# define alignof_type alignof_slot +#endif + +#endif /* _ALIGNOF_H */ -- cgit v1.2.3