projects / bison.git / blame
| Commit | Line | Data |
|---|---|---|
| a7e92301 PE |
1 | # Check for stdbool.h that conforms to C99. |
| 2 | ||
| f61aad93 | 3 | # Copyright (C) 2002-2003 Free Software Foundation, Inc. |
| a7e92301 PE |
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 | ||
| f61aad93 PE |
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 | ||
| a7e92301 PE |
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])]) | |
| f61aad93 | 86 | AC_CHECK_TYPES([_Bool]) |
| a7e92301 PE |
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]) |