| 1 | /* Test of <stddef.h> substitute.
|
|---|
| 2 | Copyright (C) 2009-2022 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 Eric Blake <ebb9@byu.net>, 2009. */
|
|---|
| 18 |
|
|---|
| 19 | #include <config.h>
|
|---|
| 20 |
|
|---|
| 21 | #include <stddef.h>
|
|---|
| 22 | #include <limits.h>
|
|---|
| 23 | #include <stdalign.h>
|
|---|
| 24 |
|
|---|
| 25 | /* Check that appropriate types are defined. */
|
|---|
| 26 | wchar_t a = 'c';
|
|---|
| 27 | ptrdiff_t b = 1;
|
|---|
| 28 | size_t c = 2;
|
|---|
| 29 | max_align_t x;
|
|---|
| 30 |
|
|---|
| 31 | /* Check that NULL can be passed through varargs as a pointer type,
|
|---|
| 32 | per POSIX 2008. */
|
|---|
| 33 | static_assert (sizeof NULL == sizeof (void *));
|
|---|
| 34 |
|
|---|
| 35 | /* Check that offsetof produces integer constants with correct type. */
|
|---|
| 36 | struct d
|
|---|
| 37 | {
|
|---|
| 38 | char e;
|
|---|
| 39 | char f;
|
|---|
| 40 | };
|
|---|
| 41 | /* Solaris 10 has a bug where offsetof is under-parenthesized, and
|
|---|
| 42 | cannot be used as an arbitrary expression. However, since it is
|
|---|
| 43 | unlikely to bite real code, we ignore that short-coming. */
|
|---|
| 44 | /* static_assert (sizeof offsetof (struct d, e) == sizeof (size_t)); */
|
|---|
| 45 | static_assert (sizeof (offsetof (struct d, e)) == sizeof (size_t));
|
|---|
| 46 | static_assert (offsetof (struct d, f) == 1);
|
|---|
| 47 |
|
|---|
| 48 | /* offsetof promotes to an unsigned integer if and only if sizes do
|
|---|
| 49 | not fit in int. */
|
|---|
| 50 | static_assert ((offsetof (struct d, e) < -1) == (INT_MAX < (size_t) -1));
|
|---|
| 51 |
|
|---|
| 52 | /* Check max_align_t's alignment. */
|
|---|
| 53 | static_assert (alignof (double) <= alignof (max_align_t));
|
|---|
| 54 | static_assert (alignof (int) <= alignof (max_align_t));
|
|---|
| 55 | static_assert (alignof (long double) <= alignof (max_align_t));
|
|---|
| 56 | static_assert (alignof (long int) <= alignof (max_align_t));
|
|---|
| 57 | static_assert (alignof (ptrdiff_t) <= alignof (max_align_t));
|
|---|
| 58 | static_assert (alignof (size_t) <= alignof (max_align_t));
|
|---|
| 59 | static_assert (alignof (wchar_t) <= alignof (max_align_t));
|
|---|
| 60 | static_assert (alignof (struct d) <= alignof (max_align_t));
|
|---|
| 61 | #if defined __GNUC__ || defined __clang__ || defined __IBM__ALIGNOF__
|
|---|
| 62 | static_assert (__alignof__ (double) <= __alignof__ (max_align_t));
|
|---|
| 63 | static_assert (__alignof__ (int) <= __alignof__ (max_align_t));
|
|---|
| 64 | static_assert (__alignof__ (long double) <= __alignof__ (max_align_t));
|
|---|
| 65 | static_assert (__alignof__ (long int) <= __alignof__ (max_align_t));
|
|---|
| 66 | static_assert (__alignof__ (ptrdiff_t) <= __alignof__ (max_align_t));
|
|---|
| 67 | static_assert (__alignof__ (size_t) <= __alignof__ (max_align_t));
|
|---|
| 68 | static_assert (__alignof__ (wchar_t) <= __alignof__ (max_align_t));
|
|---|
| 69 | static_assert (__alignof__ (struct d) <= __alignof__ (max_align_t));
|
|---|
| 70 | #endif
|
|---|
| 71 |
|
|---|
| 72 | int
|
|---|
| 73 | main (void)
|
|---|
| 74 | {
|
|---|
| 75 | return 0;
|
|---|
| 76 | }
|
|---|
