mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-29 19:30:36 +02:00
aeb22f4861
This is a followup to edfca3b7e5, which
added the 'posix_spawnp' module but not 'posix_spawn'.
* m4/gnulib-cache.m4: Add 'posix_spawn' module.
* gnulib-local/m4/clock_time.m4.diff: Adjust.
* configure.ac: Move 'gl_EARLY' use right after 'AC_PROG_CC'.
51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
/* Determine alignment of types.
|
|
Copyright (C) 2003-2004, 2006, 2009-2023 Free Software Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file 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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _ALIGNOF_H
|
|
#define _ALIGNOF_H
|
|
|
|
#include <stddef.h>
|
|
|
|
/* 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).
|
|
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 <class type> struct alignof_helper { char __slot1; type __slot2; };
|
|
# define alignof_slot(type) offsetof (alignof_helper<type>, __slot2)
|
|
#else
|
|
# define alignof_slot(type) alignof (type)
|
|
#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 and with clang on Linux/x86:
|
|
alignof_type(long long) = 8, but alignof_slot(long long) = 4.
|
|
And 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 __clang__ || defined __IBM__ALIGNOF__
|
|
# define alignof_type __alignof__
|
|
#else
|
|
# define alignof_type alignof_slot
|
|
#endif
|
|
|
|
#endif /* _ALIGNOF_H */
|