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8690e634 JK |
1 | # Check for stdbool.h that conforms to C99. |
2 | ||
c0c3707f | 3 | dnl Copyright (C) 2002-2006, 2009-2019 Free Software Foundation, Inc. |
8690e634 JK |
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 | ||
c0c3707f | 8 | #serial 8 |
8690e634 JK |
9 | |
10 | # Prepare for substituting <stdbool.h> if it is not supported. | |
11 | ||
12 | AC_DEFUN([AM_STDBOOL_H], | |
13 | [ | |
14 | AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) | |
c0c3707f | 15 | AC_REQUIRE([AC_CANONICAL_HOST]) |
8690e634 | 16 | |
c0c3707f CB |
17 | dnl On some platforms, <stdbool.h> does not exist or does not conform to C99. |
18 | dnl On Solaris 10 with CC=cc CXX=CC, <stdbool.h> exists but is not usable | |
19 | dnl in C++ mode (and no <cstdbool> exists). In this case, we use our | |
20 | dnl replacement, also in C mode (for binary compatibility between C and C++). | |
8690e634 | 21 | if test "$ac_cv_header_stdbool_h" = yes; then |
c0c3707f CB |
22 | case "$host_os" in |
23 | solaris*) | |
24 | if test -z "$GCC"; then | |
25 | STDBOOL_H='stdbool.h' | |
26 | else | |
27 | STDBOOL_H='' | |
28 | fi | |
29 | ;; | |
30 | *) | |
31 | STDBOOL_H='' | |
32 | ;; | |
33 | esac | |
8690e634 JK |
34 | else |
35 | STDBOOL_H='stdbool.h' | |
36 | fi | |
37 | AC_SUBST([STDBOOL_H]) | |
38 | AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"]) | |
39 | ||
40 | if test "$ac_cv_type__Bool" = yes; then | |
41 | HAVE__BOOL=1 | |
42 | else | |
43 | HAVE__BOOL=0 | |
44 | fi | |
45 | AC_SUBST([HAVE__BOOL]) | |
46 | ]) | |
47 | ||
48 | # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. | |
49 | AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) | |
50 | ||
51 | # This version of the macro is needed in autoconf <= 2.68. | |
52 | ||
53 | AC_DEFUN([AC_CHECK_HEADER_STDBOOL], | |
54 | [AC_CACHE_CHECK([for stdbool.h that conforms to C99], | |
55 | [ac_cv_header_stdbool_h], | |
56 | [AC_COMPILE_IFELSE( | |
57 | [AC_LANG_PROGRAM( | |
58 | [[ | |
59 | #include <stdbool.h> | |
49e4877c PA |
60 | |
61 | #ifdef __cplusplus | |
62 | typedef bool Bool; | |
63 | #else | |
64 | typedef _Bool Bool; | |
65 | #ifndef bool | |
66 | "error: bool is not defined" | |
67 | #endif | |
68 | #ifndef false | |
69 | "error: false is not defined" | |
70 | #endif | |
71 | #if false | |
72 | "error: false is not 0" | |
73 | #endif | |
74 | #ifndef true | |
75 | "error: true is not defined" | |
76 | #endif | |
77 | #if true != 1 | |
78 | "error: true is not 1" | |
79 | #endif | |
8690e634 | 80 | #endif |
49e4877c | 81 | |
8690e634 JK |
82 | #ifndef __bool_true_false_are_defined |
83 | "error: __bool_true_false_are_defined is not defined" | |
84 | #endif | |
85 | ||
49e4877c | 86 | struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s; |
8690e634 JK |
87 | |
88 | char a[true == 1 ? 1 : -1]; | |
89 | char b[false == 0 ? 1 : -1]; | |
90 | char c[__bool_true_false_are_defined == 1 ? 1 : -1]; | |
91 | char d[(bool) 0.5 == true ? 1 : -1]; | |
92 | /* See body of main program for 'e'. */ | |
49e4877c | 93 | char f[(Bool) 0.0 == false ? 1 : -1]; |
8690e634 | 94 | char g[true]; |
49e4877c | 95 | char h[sizeof (Bool)]; |
8690e634 JK |
96 | char i[sizeof s.t]; |
97 | enum { j = false, k = true, l = false * true, m = true * 256 }; | |
98 | /* The following fails for | |
99 | HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ | |
49e4877c | 100 | Bool n[m]; |
8690e634 | 101 | char o[sizeof n == m * sizeof n[0] ? 1 : -1]; |
49e4877c | 102 | char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; |
8690e634 | 103 | /* Catch a bug in an HP-UX C compiler. See |
c0c3707f CB |
104 | https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html |
105 | https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html | |
8690e634 | 106 | */ |
49e4877c PA |
107 | Bool q = true; |
108 | Bool *pq = &q; | |
109 | bool *qq = &q; | |
8690e634 JK |
110 | ]], |
111 | [[ | |
112 | bool e = &s; | |
49e4877c PA |
113 | *pq |= q; *pq |= ! q; |
114 | *qq |= q; *qq |= ! q; | |
8690e634 JK |
115 | /* Refer to every declared value, to avoid compiler optimizations. */ |
116 | return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l | |
49e4877c | 117 | + !m + !n + !o + !p + !q + !pq + !qq); |
8690e634 JK |
118 | ]])], |
119 | [ac_cv_header_stdbool_h=yes], | |
120 | [ac_cv_header_stdbool_h=no])]) | |
121 | AC_CHECK_TYPES([_Bool]) | |
122 | ]) |