1 /* Test of <stdbool.h> substitute.
2 Copyright (C) 2002-2007, 2009-2021 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>, 2007. */
18
19 /* Define ADDRESS_CHECK_OKAY if it is OK to assign an address to a 'bool'
20 and this does not generate a warning (because we want this test to succeed
21 even when using gcc's -Werror). */
22 #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) \
23 || (__clang_major__ >= 4)
24 /* We can silence the warning. */
25 # pragma GCC diagnostic ignored "-Waddress"
26 # define ADDRESS_CHECK_OKAY
27 #elif defined __GNUC__ || defined __clang__
28 /* There may be a warning. */
29 #else
30 /* Ignore warnings from other compilers. */
31 # define ADDRESS_CHECK_OKAY
32 #endif
33
34 #include <config.h>
35
36 #include <stdbool.h>
37
38 #ifndef bool
39 "error: bool is not defined"
40 #endif
41 #ifndef false
42 "error: false is not defined"
43 #endif
44 #if false
45 "error: false is not 0"
46 #endif
47 #ifndef true
48 "error: true is not defined"
49 #endif
50 #if true != 1
51 "error: true is not 1"
52 #endif
53 #ifndef __bool_true_false_are_defined
54 "error: __bool_true_false_are_defined is not defined"
55 #endif
56
57 /* Several tests cannot be guaranteed with gnulib's <stdbool.h>, at
58 least, not for all compilers and compiler options. */
59 #if HAVE_STDBOOL_H || 3 <= __GNUC__ || 4 <= __clang_major__
60 struct s { _Bool s: 1; _Bool t; } s;
61 #endif
62
63 char a[true == 1 ? 1 : -1];
64 char b[false == 0 ? 1 : -1];
65 char c[__bool_true_false_are_defined == 1 ? 1 : -1];
66 #if HAVE_STDBOOL_H || 3 <= __GNUC__ || 4 <= __clang_major__ /* See above. */
67 char d[(bool) 0.5 == true ? 1 : -1];
68 # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning. */
69 /* C99 may plausibly be interpreted as not requiring support for a cast from
70 a variable's address to bool in a static initializer. So treat it like a
71 GCC extension. */
72 # if defined __GNUC__ || defined __clang__
73 bool e = &s;
74 # endif
75 # endif
76 char f[(_Bool) 0.0 == false ? 1 : -1];
77 #endif
78 char g[true];
79 char h[sizeof (_Bool)];
80 #if HAVE_STDBOOL_H || 3 <= __GNUC__ || 4 <= __clang_major__ /* See above. */
81 char i[sizeof s.t];
82 #endif
83 enum { j = false, k = true, l = false * true, m = true * 256 };
84 _Bool n[m];
85 char o[sizeof n == m * sizeof n[0] ? 1 : -1];
86 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
87 /* Catch a bug in an HP-UX C compiler. See
88 https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
89 https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
90 */
91 _Bool q = true;
92 _Bool *pq = &q;
93
94 int
main()95 main ()
96 {
97 int error = 0;
98
99 #if HAVE_STDBOOL_H || 3 <= __GNUC_ || 4 <= __clang_major___ /* See above. */
100 # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning. */
101 /* A cast from a variable's address to bool is valid in expressions. */
102 {
103 bool e1 = &s;
104 if (!e1)
105 error = 1;
106 }
107 # endif
108 #endif
109
110 /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
111 reported by James Lemley on 2005-10-05; see
112 https://lists.gnu.org/r/bug-coreutils/2005-10/msg00086.html
113 This is a runtime test, since a corresponding compile-time
114 test would rely on initializer extensions. */
115 {
116 char digs[] = "0123456789";
117 if (&(digs + 5)[-2 + (bool) 1] != &digs[4])
118 error = 1;
119 }
120
121 return error;
122 }
123