diff options
Diffstat (limited to 'gl/m4/stdbool.m4')
-rw-r--r-- | gl/m4/stdbool.m4 | 124 |
1 files changed, 60 insertions, 64 deletions
diff --git a/gl/m4/stdbool.m4 b/gl/m4/stdbool.m4 index 3169779..c67908a 100644 --- a/gl/m4/stdbool.m4 +++ b/gl/m4/stdbool.m4 | |||
@@ -1,15 +1,15 @@ | |||
1 | # Check for stdbool.h that conforms to C99. | 1 | # Check for stdbool.h that conforms to C99. |
2 | 2 | ||
3 | dnl Copyright (C) 2002-2006, 2009-2021 Free Software Foundation, Inc. | 3 | dnl Copyright (C) 2002-2006, 2009-2022 Free Software Foundation, Inc. |
4 | dnl This file is free software; the Free Software Foundation | 4 | dnl This file is free software; the Free Software Foundation |
5 | dnl gives unlimited permission to copy and/or distribute it, | 5 | dnl gives unlimited permission to copy and/or distribute it, |
6 | dnl with or without modifications, as long as this notice is preserved. | 6 | dnl with or without modifications, as long as this notice is preserved. |
7 | 7 | ||
8 | #serial 8 | 8 | #serial 9 |
9 | 9 | ||
10 | # Prepare for substituting <stdbool.h> if it is not supported. | 10 | # Prepare for substituting <stdbool.h> if it is not supported. |
11 | 11 | ||
12 | AC_DEFUN([AM_STDBOOL_H], | 12 | AC_DEFUN([gl_STDBOOL_H], |
13 | [ | 13 | [ |
14 | AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) | 14 | AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) |
15 | AC_REQUIRE([AC_CANONICAL_HOST]) | 15 | AC_REQUIRE([AC_CANONICAL_HOST]) |
@@ -22,20 +22,18 @@ AC_DEFUN([AM_STDBOOL_H], | |||
22 | case "$host_os" in | 22 | case "$host_os" in |
23 | solaris*) | 23 | solaris*) |
24 | if test -z "$GCC"; then | 24 | if test -z "$GCC"; then |
25 | STDBOOL_H='stdbool.h' | 25 | GL_GENERATE_STDBOOL_H=true |
26 | else | 26 | else |
27 | STDBOOL_H='' | 27 | GL_GENERATE_STDBOOL_H=false |
28 | fi | 28 | fi |
29 | ;; | 29 | ;; |
30 | *) | 30 | *) |
31 | STDBOOL_H='' | 31 | GL_GENERATE_STDBOOL_H=false |
32 | ;; | 32 | ;; |
33 | esac | 33 | esac |
34 | else | 34 | else |
35 | STDBOOL_H='stdbool.h' | 35 | GL_GENERATE_STDBOOL_H=true |
36 | fi | 36 | fi |
37 | AC_SUBST([STDBOOL_H]) | ||
38 | AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"]) | ||
39 | 37 | ||
40 | if test "$ac_cv_type__Bool" = yes; then | 38 | if test "$ac_cv_type__Bool" = yes; then |
41 | HAVE__BOOL=1 | 39 | HAVE__BOOL=1 |
@@ -45,78 +43,76 @@ AC_DEFUN([AM_STDBOOL_H], | |||
45 | AC_SUBST([HAVE__BOOL]) | 43 | AC_SUBST([HAVE__BOOL]) |
46 | ]) | 44 | ]) |
47 | 45 | ||
48 | # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. | 46 | m4_version_prereq([2.72], [], [ |
49 | AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) | ||
50 | |||
51 | # This version of the macro is needed in autoconf <= 2.68. | ||
52 | 47 | ||
53 | AC_DEFUN([AC_CHECK_HEADER_STDBOOL], | 48 | AC_DEFUN([AC_CHECK_HEADER_STDBOOL], |
54 | [AC_CACHE_CHECK([for stdbool.h that conforms to C99], | 49 | [AC_CHECK_TYPES([_Bool]) |
50 | AC_CACHE_CHECK([for stdbool.h that conforms to C99 or later], | ||
55 | [ac_cv_header_stdbool_h], | 51 | [ac_cv_header_stdbool_h], |
56 | [AC_COMPILE_IFELSE( | 52 | [AC_COMPILE_IFELSE( |
57 | [AC_LANG_PROGRAM( | 53 | [AC_LANG_PROGRAM( |
58 | [[ | 54 | [[#include <stdbool.h> |
59 | #include <stdbool.h> | 55 | |
60 | 56 | /* "true" and "false" should be usable in #if expressions and | |
61 | #ifdef __cplusplus | 57 | integer constant expressions, and "bool" should be a valid |
62 | typedef bool Bool; | 58 | type name. |
63 | #else | 59 | |
64 | typedef _Bool Bool; | 60 | Although C 1999 requires bool, true, and false to be macros, |
65 | #ifndef bool | 61 | C 2023 and C++ 2011 overrule that, so do not test for that. |
66 | "error: bool is not defined" | 62 | Although C 1999 requires __bool_true_false_are_defined and |
67 | #endif | 63 | _Bool, C 2023 says they are obsolescent, so do not require |
68 | #ifndef false | 64 | them. */ |
69 | "error: false is not defined" | 65 | |
70 | #endif | 66 | #if !true |
71 | #if false | 67 | #error "'true' is not true" |
72 | "error: false is not 0" | 68 | #endif |
73 | #endif | 69 | #if true != 1 |
74 | #ifndef true | 70 | #error "'true' is not equal to 1" |
75 | "error: true is not defined" | ||
76 | #endif | ||
77 | #if true != 1 | ||
78 | "error: true is not 1" | ||
79 | #endif | ||
80 | #endif | 71 | #endif |
72 | char b[true == 1 ? 1 : -1]; | ||
73 | char c[true]; | ||
81 | 74 | ||
82 | #ifndef __bool_true_false_are_defined | 75 | #if false |
83 | "error: __bool_true_false_are_defined is not defined" | 76 | #error "'false' is not false" |
77 | #endif | ||
78 | #if false != 0 | ||
79 | #error "'false' is not equal to 0" | ||
84 | #endif | 80 | #endif |
81 | char d[false == 0 ? 1 : -1]; | ||
82 | |||
83 | enum { e = false, f = true, g = false * true, h = true * 256 }; | ||
84 | |||
85 | char i[(bool) 0.5 == true ? 1 : -1]; | ||
86 | char j[(bool) 0.0 == false ? 1 : -1]; | ||
87 | char k[sizeof (bool) > 0 ? 1 : -1]; | ||
88 | |||
89 | struct sb { bool s: 1; bool t; } s; | ||
90 | char l[sizeof s.t > 0 ? 1 : -1]; | ||
85 | 91 | ||
86 | struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s; | ||
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'. */ | ||
93 | char f[(Bool) 0.0 == false ? 1 : -1]; | ||
94 | char g[true]; | ||
95 | char h[sizeof (Bool)]; | ||
96 | char i[sizeof s.t]; | ||
97 | enum { j = false, k = true, l = false * true, m = true * 256 }; | ||
98 | /* The following fails for | 92 | /* The following fails for |
99 | HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ | 93 | HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ |
100 | Bool n[m]; | 94 | bool m[h]; |
101 | char o[sizeof n == m * sizeof n[0] ? 1 : -1]; | 95 | char n[sizeof m == h * sizeof m[0] ? 1 : -1]; |
102 | char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; | 96 | char o[-1 - (bool) 0 < 0 ? 1 : -1]; |
103 | /* Catch a bug in an HP-UX C compiler. See | 97 | /* Catch a bug in an HP-UX C compiler. See |
104 | https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html | 98 | https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html |
105 | https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html | 99 | https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html |
106 | */ | 100 | */ |
107 | Bool q = true; | 101 | bool p = true; |
108 | Bool *pq = &q; | 102 | bool *pp = &p; |
109 | bool *qq = &q; | ||
110 | ]], | 103 | ]], |
111 | [[ | 104 | [[ |
112 | bool e = &s; | 105 | bool ps = &s; |
113 | *pq |= q; *pq |= ! q; | 106 | *pp |= p; |
114 | *qq |= q; *qq |= ! q; | 107 | *pp |= ! p; |
115 | /* Refer to every declared value, to avoid compiler optimizations. */ | 108 | |
116 | return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l | 109 | /* Refer to every declared value, so they cannot be |
117 | + !m + !n + !o + !p + !q + !pq + !qq); | 110 | discarded as unused. */ |
111 | return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k | ||
112 | + !l + !m + !n + !o + !p + !pp + !ps); | ||
118 | ]])], | 113 | ]])], |
119 | [ac_cv_header_stdbool_h=yes], | 114 | [ac_cv_header_stdbool_h=yes], |
120 | [ac_cv_header_stdbool_h=no])]) | 115 | [ac_cv_header_stdbool_h=no])]) |
121 | AC_CHECK_TYPES([_Bool]) | 116 | ])# AC_CHECK_HEADER_STDBOOL |
122 | ]) | 117 | |
118 | ]) # m4_version_prereq 2.72 | ||