1 /* Test of <stdalign.h>.
2 Copyright 2009-2021 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Written by Paul Eggert, inspired by Bruno Haible's test-alignof.c. */
30 typedef long double longdouble;
31 typedef struct { char a[1]; } struct1;
32 typedef struct { char a[2]; } struct2;
33 typedef struct { char a[3]; } struct3;
34 typedef struct { char a[4]; } struct4;
36 verify (__alignof_is_defined == 1);
38 # error "alignof is not a macro"
41 #if __alignas_is_defined
42 verify (__alignas_is_defined == 1);
44 # error "alignas is not a macro"
46 /* mingw can go up only to 8. 8 is all that GNU Emacs needs, so let's
47 limit the test to 8 for now. */
48 # define TEST_ALIGNMENT 8
50 # define _Alignas(alignment)
51 # define alignas(alignment)
52 # define TEST_ALIGNMENT 1
55 #define CHECK_STATIC(type) \
56 typedef struct { char slot1; type slot2; } type##_helper; \
57 verify (alignof (type) == offsetof (type##_helper, slot2)); \
58 verify (_Alignof (type) == alignof (type)); \
59 const int type##_alignment = alignof (type); \
60 type alignas (TEST_ALIGNMENT) static_##type##_alignas; \
61 type _Alignas (TEST_ALIGNMENT) static_##type##_Alignas
63 #define CHECK_ALIGNED(var) ASSERT ((uintptr_t) &(var) % TEST_ALIGNMENT == 0)
70 CHECK_STATIC (int64_t);
73 CHECK_STATIC (double);
74 /* CHECK_STATIC (longdouble); */
75 CHECK_STATIC (struct1);
76 CHECK_STATIC (struct2);
77 CHECK_STATIC (struct3);
78 CHECK_STATIC (struct4);
83 #if defined __SUNPRO_C && __SUNPRO_C < 0x5150
84 /* Avoid a test failure due to Sun Studio Developer Bug Report #2125432. */
85 fputs ("Skipping test: known Sun C compiler bug\n", stderr);
87 #elif defined __HP_cc && __ia64
88 /* Avoid a test failure due to HP-UX Itanium cc bug; see:
89 https://lists.gnu.org/r/bug-gnulib/2017-03/msg00078.html */
90 fputs ("Skipping test: known HP-UX Itanium cc compiler bug\n", stderr);
92 #elif defined __clang__ && defined __ibmxl__
93 /* Avoid a test failure with IBM xlc 16.1. It ignores alignas (8),
94 _Alignas (8), and __attribute__ ((__aligned__ (8))). */
95 fputs ("Skipping test: known AIX XL C compiler deficiency\n", stderr);
98 CHECK_ALIGNED (static_char_alignas);
99 CHECK_ALIGNED (static_char_Alignas);
100 CHECK_ALIGNED (static_short_alignas);
101 CHECK_ALIGNED (static_short_Alignas);
102 CHECK_ALIGNED (static_int_alignas);
103 CHECK_ALIGNED (static_int_Alignas);
104 CHECK_ALIGNED (static_long_alignas);
105 CHECK_ALIGNED (static_long_Alignas);
107 CHECK_ALIGNED (static_int64_t_alignas);
108 CHECK_ALIGNED (static_int64_t_Alignas);
110 CHECK_ALIGNED (static_float_alignas);
111 CHECK_ALIGNED (static_float_Alignas);
112 CHECK_ALIGNED (static_double_alignas);
113 CHECK_ALIGNED (static_double_Alignas);
114 /* CHECK_ALIGNED (static_longdouble_alignas); */
115 /* CHECK_ALIGNED (static_longdouble_Alignas); */
116 CHECK_ALIGNED (static_struct1_alignas);
117 CHECK_ALIGNED (static_struct1_Alignas);
118 CHECK_ALIGNED (static_struct2_alignas);
119 CHECK_ALIGNED (static_struct2_Alignas);
120 CHECK_ALIGNED (static_struct3_alignas);
121 CHECK_ALIGNED (static_struct3_Alignas);
122 CHECK_ALIGNED (static_struct4_alignas);
123 CHECK_ALIGNED (static_struct4_Alignas);