projects / bison.git / blame
| Commit | Line | Data |
|---|---|---|
| a7e92301 PE |
1 | # Check for stdbool.h that conforms to C99. |
| 2 | ||
| 3 | # Copyright (C) 2002 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 | AC_DEFUN([AC_HEADER_STDBOOL], | |
| 21 | [AC_CACHE_CHECK([for stdbool.h that conforms to C99], | |
| 22 | [ac_cv_header_stdbool_h], | |
| 23 | [AC_TRY_COMPILE( | |
| 24 | [ | |
| 25 | #include <stdbool.h> | |
| 26 | #ifndef bool | |
| 27 | "error: bool is not defined" | |
| 28 | #endif | |
| 29 | #ifndef false | |
| 30 | "error: false is not defined" | |
| 31 | #endif | |
| 32 | #if false | |
| 33 | "error: false is not 0" | |
| 34 | #endif | |
| 35 | #ifndef true | |
| 36 | "error: false is not defined" | |
| 37 | #endif | |
| 38 | #if true != 1 | |
| 39 | "error: true is not 1" | |
| 40 | #endif | |
| 41 | #ifndef __bool_true_false_are_defined | |
| 42 | "error: __bool_true_false_are_defined is not defined" | |
| 43 | #endif | |
| 44 | ||
| 45 | struct s { _Bool s: 1; _Bool t; } s; | |
| 46 | ||
| 47 | char a[true == 1 ? 1 : -1]; | |
| 48 | char b[false == 0 ? 1 : -1]; | |
| 49 | char c[__bool_true_false_are_defined == 1 ? 1 : -1]; | |
| 50 | char d[(bool) -0.5 == true ? 1 : -1]; | |
| 51 | bool e = &s; | |
| 52 | char f[(_Bool) -0.0 == false ? 1 : -1]; | |
| 53 | char g[true]; | |
| 54 | char h[sizeof (_Bool)]; | |
| 55 | char i[sizeof s.t]; | |
| 56 | ], | |
| 57 | [ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ], | |
| 58 | [ac_cv_header_stdbool_h=yes], | |
| 59 | [ac_cv_header_stdbool_h=no])]) | |
| 60 | if test $ac_cv_header_stdbool_h = yes; then | |
| 61 | AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.]) | |
| 62 | fi]) |