view tests/test-alignof.c @ 16817:7747cb9b54b9

unistd_h: make it easier to avoid sys_types_h This is useful for Emacs, which has its own method of porting to Windows, and which therefore does not need the sys_types_h module. * m4/off_t.m4: New file, defining gl_TYPE_OFF_T, which contains code moved here from gl_SYS_TYPES_H. * m4/sys_types_h.m4 (gl_SYS_TYPES_H): Require it instead of using the code directly. * m4/unistd_h.m4 (gl_UNISTD_H): Require gl_TYPE_OFF_T, not gl_SYS_TYPES_H. * modules/sys_types (Files): * modules/unistd (Files): Add m4/off_t.m4.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 04 May 2012 13:05:31 -0700
parents 8250f2777afc
children e542fd46ad6f
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/* Test of <alignof.h>.
   Copyright (C) 2009-2012 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 of the License, 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 <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2009.  */

#include <config.h>

#include <alignof.h>

#include <stddef.h>
#include <stdint.h>

#include "verify.h"

typedef long double longdouble;
typedef struct { char a[1]; } struct1;
typedef struct { char a[2]; } struct2;
typedef struct { char a[3]; } struct3;
typedef struct { char a[4]; } struct4;

#define CHECK(type) \
  typedef struct { char slot1; type slot2; } type##_helper; \
  verify (alignof_slot (type) == offsetof (type##_helper, slot2)); \
  const int type##_slot_alignment = alignof_slot (type); \
  const int type##_type_alignment = alignof_type (type);

CHECK (char)
CHECK (short)
CHECK (int)
CHECK (long)
CHECK (float)
CHECK (double)
CHECK (longdouble)
#ifdef INT64_MAX
CHECK (int64_t)
#endif
CHECK (struct1)
CHECK (struct2)
CHECK (struct3)
CHECK (struct4)

int
main ()
{
  return 0;
}