| | 1 | # Check for stdbool.h that conforms to C99. |
| | 2 | |
| | 3 | # Copyright (C) 2002-2003 Free Software Foundation, Inc. |
| | 4 | |
| | 5 | # This program is free software; you can redistribute it and/or modify |
| | 6 | # it under the terms of the GNU General Public License as published by |
| | 7 | # the Free Software Foundation; either version 2, or (at your option) |
| | 8 | # any later version. |
| | 9 | |
| | 10 | # This program is distributed in the hope that it will be useful, |
| | 11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| | 13 | # GNU General Public License for more details. |
| | 14 | |
| | 15 | # You should have received a copy of the GNU General Public License |
| | 16 | # along with this program; if not, write to the Free Software |
| | 17 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| | 18 | # 02111-1307, USA. |
| | 19 | |
| | 20 | # Prepare for substituting <stdbool.h> if it is not supported. |
| | 21 | |
| | 22 | AC_DEFUN([AM_STDBOOL_H], |
| | 23 | [ |
| | 24 | AC_REQUIRE([AC_HEADER_STDBOOL]) |
| | 25 | |
| | 26 | # Define two additional variables used in the Makefile substitution. |
| | 27 | |
| | 28 | if test "$ac_cv_header_stdbool_h" = yes; then |
| | 29 | STDBOOL_H='' |
| | 30 | else |
| | 31 | STDBOOL_H='stdbool.h' |
| | 32 | fi |
| | 33 | AC_SUBST([STDBOOL_H]) |
| | 34 | |
| | 35 | if test "$ac_cv_type__Bool" = yes; then |
| | 36 | HAVE__BOOL=1 |
| | 37 | else |
| | 38 | HAVE__BOOL=0 |
| | 39 | fi |
| | 40 | AC_SUBST([HAVE__BOOL]) |
| | 41 | ]) |
| | 42 | |
| | 43 | # This macro is only needed in autoconf <= 2.54. Newer versions of autoconf |
| | 44 | # have this macro built-in. |
| | 45 | |
| | 46 | AC_DEFUN([AC_HEADER_STDBOOL], |
| | 47 | [AC_CACHE_CHECK([for stdbool.h that conforms to C99], |
| | 48 | [ac_cv_header_stdbool_h], |
| | 49 | [AC_TRY_COMPILE( |
| | 50 | [ |
| | 51 | #include <stdbool.h> |
| | 52 | #ifndef bool |
| | 53 | "error: bool is not defined" |
| | 54 | #endif |
| | 55 | #ifndef false |
| | 56 | "error: false is not defined" |
| | 57 | #endif |
| | 58 | #if false |
| | 59 | "error: false is not 0" |
| | 60 | #endif |
| | 61 | #ifndef true |
| | 62 | "error: false is not defined" |
| | 63 | #endif |
| | 64 | #if true != 1 |
| | 65 | "error: true is not 1" |
| | 66 | #endif |
| | 67 | #ifndef __bool_true_false_are_defined |
| | 68 | "error: __bool_true_false_are_defined is not defined" |
| | 69 | #endif |
| | 70 | |
| | 71 | struct s { _Bool s: 1; _Bool t; } s; |
| | 72 | |
| | 73 | char a[true == 1 ? 1 : -1]; |
| | 74 | char b[false == 0 ? 1 : -1]; |
| | 75 | char c[__bool_true_false_are_defined == 1 ? 1 : -1]; |
| | 76 | char d[(bool) -0.5 == true ? 1 : -1]; |
| | 77 | bool e = &s; |
| | 78 | char f[(_Bool) -0.0 == false ? 1 : -1]; |
| | 79 | char g[true]; |
| | 80 | char h[sizeof (_Bool)]; |
| | 81 | char i[sizeof s.t]; |
| | 82 | ], |
| | 83 | [ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ], |
| | 84 | [ac_cv_header_stdbool_h=yes], |
| | 85 | [ac_cv_header_stdbool_h=no])]) |
| | 86 | AC_CHECK_TYPES([_Bool]) |
| | 87 | if test $ac_cv_header_stdbool_h = yes; then |
| | 88 | AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.]) |
| | 89 | fi]) |
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