tests/test-alignof.c

   1 /* Test of <alignof.h>.
   2    Copyright (C) 2009-2025 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2009.  */
  18
  19 #include <config.h>
  20
  21 #include <alignof.h>
  22
  23 #include <stddef.h>
  24 #include <stdint.h>
  25
  26 typedef long double longdouble;
  27 typedef struct { char a[1]; } struct1;
  28 typedef struct { char a[2]; } struct2;
  29 typedef struct { char a[3]; } struct3;
  30 typedef struct { char a[4]; } struct4;
  31
  32 #define CHECK(type) \
  33   typedef struct { char slot1; type slot2; } type##_helper; \
  34   static_assert (alignof_slot (type) == offsetof (type##_helper, slot2)); \
  35   const int type##_slot_alignment = alignof_slot (type); \
  36   const int type##_type_alignment = alignof_type (type);
  37
  38 CHECK (char)
  39 CHECK (short)
  40 CHECK (int)
  41 CHECK (long)
  42 CHECK (float)
  43 CHECK (double)
  44 CHECK (longdouble)
  45 #ifdef INT64_MAX
  46 CHECK (int64_t)
  47 #endif
  48 CHECK (struct1)
  49 CHECK (struct2)
  50 CHECK (struct3)
  51 CHECK (struct4)
  52
  53 int
  54 main ()
  55 {
  56   return 0;
  57 }