| 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., 59 Temple Place - Suite 330, Boston, MA
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| 18 | # 02111-1307, USA.
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| 19 |
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| 20 | # Prepare for substituting <stdbool.h> if it is not supported.
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| 21 |
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| 22 | AC_DEFUN([AM_STDBOOL_H],
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| 23 | [
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| 24 | AC_REQUIRE([AC_HEADER_STDBOOL])
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| 25 |
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| 26 | # Define two additional variables used in the Makefile substitution.
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| 27 |
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| 28 | if test "$ac_cv_header_stdbool_h" = yes; then
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| 29 | STDBOOL_H=''
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| 30 | else
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| 31 | STDBOOL_H='stdbool.h'
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| 32 | fi
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| 33 | AC_SUBST([STDBOOL_H])
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| 34 |
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| 35 | if test "$ac_cv_type__Bool" = yes; then
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| 36 | HAVE__BOOL=1
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| 37 | else
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| 38 | HAVE__BOOL=0
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| 39 | fi
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| 40 | AC_SUBST([HAVE__BOOL])
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| 41 | ])
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| 42 |
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| 43 | # This macro is only needed in autoconf <= 2.54. Newer versions of autoconf
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| 44 | # have this macro built-in.
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| 45 |
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| 46 | AC_DEFUN([AC_HEADER_STDBOOL],
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| 47 | [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
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| 48 | [ac_cv_header_stdbool_h],
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| 49 | [AC_TRY_COMPILE(
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| 50 | [
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| 51 | #include <stdbool.h>
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| 52 | #ifndef bool
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| 53 | "error: bool is not defined"
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| 54 | #endif
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| 55 | #ifndef false
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| 56 | "error: false is not defined"
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| 57 | #endif
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| 58 | #if false
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| 59 | "error: false is not 0"
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| 60 | #endif
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| 61 | #ifndef true
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| 62 | "error: false is not defined"
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| 63 | #endif
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| 64 | #if true != 1
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| 65 | "error: true is not 1"
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| 66 | #endif
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| 67 | #ifndef __bool_true_false_are_defined
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| 68 | "error: __bool_true_false_are_defined is not defined"
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| 69 | #endif
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| 70 |
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| 71 | struct s { _Bool s: 1; _Bool t; } s;
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| 72 |
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| 73 | char a[true == 1 ? 1 : -1];
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| 74 | char b[false == 0 ? 1 : -1];
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| 75 | char c[__bool_true_false_are_defined == 1 ? 1 : -1];
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| 76 | char d[(bool) -0.5 == true ? 1 : -1];
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| 77 | bool e = &s;
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| 78 | char f[(_Bool) -0.0 == false ? 1 : -1];
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| 79 | char g[true];
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| 80 | char h[sizeof (_Bool)];
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| 81 | char i[sizeof s.t];
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| 82 | ],
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| 83 | [ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ],
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| 84 | [ac_cv_header_stdbool_h=yes],
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| 85 | [ac_cv_header_stdbool_h=no])])
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| 86 | AC_CHECK_TYPES([_Bool])
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| 87 | if test $ac_cv_header_stdbool_h = yes; then
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| 88 | AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
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| 89 | fi])
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