| 1 | # Check for stdbool.h that conforms to C99.
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| 2 |
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| 3 | # Copyright (C) 2002-2003 Free Software Foundation, Inc.
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| 4 |
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| 5 | # This program is free software; you can redistribute it and/or modify
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| 6 | # it under the terms of the GNU General Public License as published by
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| 7 | # the Free Software Foundation; either version 2, or (at your option)
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| 8 | # any later version.
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| 9 |
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| 10 | # This program is distributed in the hope that it will be useful,
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| 11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | # GNU General Public License for more details.
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| 14 |
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| 15 | # You should have received a copy of the GNU General Public License
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| 16 | # along with this program; if not, write to the Free Software
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| 17 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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| 18 | # 02110-1301, USA.
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| 19 |
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| 20 | # This macro is only needed in autoconf <= 2.54. Newer versions of autoconf
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| 21 | # have this macro built-in.
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| 22 |
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| 23 | AC_DEFUN([AC_HEADER_STDBOOL],
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| 24 | [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
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| 25 | [ac_cv_header_stdbool_h],
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| 26 | [AC_TRY_COMPILE(
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| 27 | [
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| 28 | #include <stdbool.h>
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| 29 | #ifndef bool
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| 30 | "error: bool is not defined"
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| 31 | #endif
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| 32 | #ifndef false
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| 33 | "error: false is not defined"
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| 34 | #endif
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| 35 | #if false
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| 36 | "error: false is not 0"
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| 37 | #endif
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| 38 | #ifndef true
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| 39 | "error: false is not defined"
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| 40 | #endif
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| 41 | #if true != 1
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| 42 | "error: true is not 1"
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| 43 | #endif
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| 44 | #ifndef __bool_true_false_are_defined
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| 45 | "error: __bool_true_false_are_defined is not defined"
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| 46 | #endif
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| 47 |
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| 48 | struct s { _Bool s: 1; _Bool t; } s;
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| 49 |
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| 50 | char a[true == 1 ? 1 : -1];
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| 51 | char b[false == 0 ? 1 : -1];
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| 52 | char c[__bool_true_false_are_defined == 1 ? 1 : -1];
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| 53 | char d[(bool) -0.5 == true ? 1 : -1];
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| 54 | bool e = &s;
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| 55 | char f[(_Bool) -0.0 == false ? 1 : -1];
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| 56 | char g[true];
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| 57 | char h[sizeof (_Bool)];
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| 58 | char i[sizeof s.t];
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| 59 | ],
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| 60 | [ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ],
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| 61 | [ac_cv_header_stdbool_h=yes],
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| 62 | [ac_cv_header_stdbool_h=no])])
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| 63 | AC_CHECK_TYPES([_Bool])
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| 64 | if test $ac_cv_header_stdbool_h = yes; then
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| 65 | AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
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| 66 | fi])
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