|
272
|
1 # Check for stdbool.h that conforms to C99.
|
|
|
2
|
|
|
3 dnl Copyright (C) 2002-2006 Free Software Foundation, Inc.
|
|
|
4 dnl This file is free software; the Free Software Foundation
|
|
|
5 dnl gives unlimited permission to copy and/or distribute it,
|
|
|
6 dnl with or without modifications, as long as this notice is preserved.
|
|
|
7
|
|
|
8 # Prepare for substituting <stdbool.h> if it is not supported.
|
|
|
9
|
|
|
10 AC_DEFUN([AM_STDBOOL_H],
|
|
|
11 [
|
|
|
12 AC_REQUIRE([AC_HEADER_STDBOOL])
|
|
|
13
|
|
|
14 # Define two additional variables used in the Makefile substitution.
|
|
|
15
|
|
|
16 if test "$ac_cv_header_stdbool_h" = yes; then
|
|
|
17 STDBOOL_H=''
|
|
|
18 else
|
|
|
19 STDBOOL_H='stdbool.h'
|
|
|
20 fi
|
|
|
21 AC_SUBST([STDBOOL_H])
|
|
|
22
|
|
|
23 if test "$ac_cv_type__Bool" = yes; then
|
|
|
24 HAVE__BOOL=1
|
|
|
25 else
|
|
|
26 HAVE__BOOL=0
|
|
|
27 fi
|
|
|
28 AC_SUBST([HAVE__BOOL])
|
|
|
29 ])
|
|
|
30
|
|
|
31 # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
|
|
|
32 AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
|
|
|
33
|
|
|
34 # This macro is only needed in autoconf <= 2.59. Newer versions of autoconf
|
|
|
35 # have this macro built-in.
|
|
|
36
|
|
|
37 AC_DEFUN([AC_HEADER_STDBOOL],
|
|
|
38 [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
|
|
|
39 [ac_cv_header_stdbool_h],
|
|
|
40 [AC_TRY_COMPILE(
|
|
|
41 [
|
|
|
42 #include <stdbool.h>
|
|
|
43 #ifndef bool
|
|
|
44 "error: bool is not defined"
|
|
|
45 #endif
|
|
|
46 #ifndef false
|
|
|
47 "error: false is not defined"
|
|
|
48 #endif
|
|
|
49 #if false
|
|
|
50 "error: false is not 0"
|
|
|
51 #endif
|
|
|
52 #ifndef true
|
|
|
53 "error: true is not defined"
|
|
|
54 #endif
|
|
|
55 #if true != 1
|
|
|
56 "error: true is not 1"
|
|
|
57 #endif
|
|
|
58 #ifndef __bool_true_false_are_defined
|
|
|
59 "error: __bool_true_false_are_defined is not defined"
|
|
|
60 #endif
|
|
|
61
|
|
|
62 struct s { _Bool s: 1; _Bool t; } s;
|
|
|
63
|
|
|
64 char a[true == 1 ? 1 : -1];
|
|
|
65 char b[false == 0 ? 1 : -1];
|
|
|
66 char c[__bool_true_false_are_defined == 1 ? 1 : -1];
|
|
|
67 char d[(bool) 0.5 == true ? 1 : -1];
|
|
|
68 bool e = &s;
|
|
|
69 char f[(_Bool) 0.0 == false ? 1 : -1];
|
|
|
70 char g[true];
|
|
|
71 char h[sizeof (_Bool)];
|
|
|
72 char i[sizeof s.t];
|
|
|
73 enum { j = false, k = true, l = false * true, m = true * 256 };
|
|
|
74 _Bool n[m];
|
|
|
75 char o[sizeof n == m * sizeof n[0] ? 1 : -1];
|
|
|
76 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
|
|
|
77 #if defined __xlc__ || defined __GNUC__
|
|
|
78 /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
|
|
|
79 reported by James Lemley on 2005-10-05; see
|
|
|
80 http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
|
|
|
81 This test is not quite right, since xlc is allowed to
|
|
|
82 reject this program, as the initializer for xlcbug is
|
|
|
83 not one of the forms that C requires support for.
|
|
|
84 However, doing the test right would require a run-time
|
|
|
85 test, and that would make cross-compilation harder.
|
|
|
86 Let us hope that IBM fixes the xlc bug, and also adds
|
|
|
87 support for this kind of constant expression. In the
|
|
|
88 meantime, this test will reject xlc, which is OK, since
|
|
|
89 our stdbool.h substitute should suffice. We also test
|
|
|
90 this with GCC, where it should work, to detect more
|
|
|
91 quickly whether someone messes up the test in the
|
|
|
92 future. */
|
|
|
93 char digs[] = "0123456789";
|
|
|
94 int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
|
|
|
95 #endif
|
|
|
96 /* Catch a bug in an HP-UX C compiler. See
|
|
|
97 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
|
|
|
98 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
|
|
|
99 */
|
|
|
100 _Bool q = true;
|
|
|
101 _Bool *pq = &q;
|
|
|
102 ],
|
|
|
103 [
|
|
|
104 *pq |= q;
|
|
|
105 *pq |= ! q;
|
|
|
106 /* Refer to every declared value, to avoid compiler optimizations. */
|
|
|
107 return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
|
|
|
108 + !m + !n + !o + !p + !q + !pq);
|
|
|
109 ],
|
|
|
110 [ac_cv_header_stdbool_h=yes],
|
|
|
111 [ac_cv_header_stdbool_h=no])])
|
|
|
112 AC_CHECK_TYPES([_Bool])
|
|
|
113 if test $ac_cv_header_stdbool_h = yes; then
|
|
|
114 AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
|
|
|
115 fi])
|
