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-rw-r--r--gl/m4/stdbool.m4100
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diff --git a/gl/m4/stdbool.m4 b/gl/m4/stdbool.m4
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1# Check for stdbool.h that conforms to C99.
2
3dnl Copyright (C) 2002-2006, 2009-2013 Free Software Foundation, Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8#serial 5
9
10# Prepare for substituting <stdbool.h> if it is not supported.
11
12AC_DEFUN([AM_STDBOOL_H],
13[
14 AC_REQUIRE([AC_CHECK_HEADER_STDBOOL])
15
16 # Define two additional variables used in the Makefile substitution.
17
18 if test "$ac_cv_header_stdbool_h" = yes; then
19 STDBOOL_H=''
20 else
21 STDBOOL_H='stdbool.h'
22 fi
23 AC_SUBST([STDBOOL_H])
24 AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"])
25
26 if test "$ac_cv_type__Bool" = yes; then
27 HAVE__BOOL=1
28 else
29 HAVE__BOOL=0
30 fi
31 AC_SUBST([HAVE__BOOL])
32])
33
34# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
35AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
36
37# This version of the macro is needed in autoconf <= 2.68.
38
39AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
40 [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
41 [ac_cv_header_stdbool_h],
42 [AC_COMPILE_IFELSE(
43 [AC_LANG_PROGRAM(
44 [[
45 #include <stdbool.h>
46 #ifndef bool
47 "error: bool is not defined"
48 #endif
49 #ifndef false
50 "error: false is not defined"
51 #endif
52 #if false
53 "error: false is not 0"
54 #endif
55 #ifndef true
56 "error: true is not defined"
57 #endif
58 #if true != 1
59 "error: true is not 1"
60 #endif
61 #ifndef __bool_true_false_are_defined
62 "error: __bool_true_false_are_defined is not defined"
63 #endif
64
65 struct s { _Bool s: 1; _Bool t; } s;
66
67 char a[true == 1 ? 1 : -1];
68 char b[false == 0 ? 1 : -1];
69 char c[__bool_true_false_are_defined == 1 ? 1 : -1];
70 char d[(bool) 0.5 == true ? 1 : -1];
71 /* See body of main program for 'e'. */
72 char f[(_Bool) 0.0 == false ? 1 : -1];
73 char g[true];
74 char h[sizeof (_Bool)];
75 char i[sizeof s.t];
76 enum { j = false, k = true, l = false * true, m = true * 256 };
77 /* The following fails for
78 HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
79 _Bool n[m];
80 char o[sizeof n == m * sizeof n[0] ? 1 : -1];
81 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
82 /* Catch a bug in an HP-UX C compiler. See
83 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
84 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
85 */
86 _Bool q = true;
87 _Bool *pq = &q;
88 ]],
89 [[
90 bool e = &s;
91 *pq |= q;
92 *pq |= ! q;
93 /* Refer to every declared value, to avoid compiler optimizations. */
94 return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
95 + !m + !n + !o + !p + !q + !pq);
96 ]])],
97 [ac_cv_header_stdbool_h=yes],
98 [ac_cv_header_stdbool_h=no])])
99 AC_CHECK_TYPES([_Bool])
100])