# Check for stdbool.h that conforms to C99. # Copyright (C) 2002-2003 Free Software Foundation, Inc. # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. # Prepare for substituting if it is not supported. AC_DEFUN([AM_STDBOOL_H], [ AC_REQUIRE([AC_HEADER_STDBOOL]) # Define two additional variables used in the Makefile substitution. if test "$ac_cv_header_stdbool_h" = yes; then STDBOOL_H='' else STDBOOL_H='stdbool.h' fi AC_SUBST([STDBOOL_H]) if test "$ac_cv_type__Bool" = yes; then HAVE__BOOL=1 else HAVE__BOOL=0 fi AC_SUBST([HAVE__BOOL]) ]) # This macro is only needed in autoconf <= 2.54. Newer versions of autoconf # have this macro built-in. AC_DEFUN([AC_HEADER_STDBOOL], [AC_CACHE_CHECK([for stdbool.h that conforms to C99], [ac_cv_header_stdbool_h], [AC_TRY_COMPILE( [ #include #ifndef bool "error: bool is not defined" #endif #ifndef false "error: false is not defined" #endif #if false "error: false is not 0" #endif #ifndef true "error: false is not defined" #endif #if true != 1 "error: true is not 1" #endif #ifndef __bool_true_false_are_defined "error: __bool_true_false_are_defined is not defined" #endif struct s { _Bool s: 1; _Bool t; } s; char a[true == 1 ? 1 : -1]; char b[false == 0 ? 1 : -1]; char c[__bool_true_false_are_defined == 1 ? 1 : -1]; char d[(bool) -0.5 == true ? 1 : -1]; bool e = &s; char f[(_Bool) -0.0 == false ? 1 : -1]; char g[true]; char h[sizeof (_Bool)]; char i[sizeof s.t]; ], [ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ], [ac_cv_header_stdbool_h=yes], [ac_cv_header_stdbool_h=no])]) AC_CHECK_TYPES([_Bool]) if test $ac_cv_header_stdbool_h = yes; then AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.]) fi])