# stdbool.m4 serial 3 (gettext-0.12) dnl Copyright (C) 2001-2003 Free Software Foundation, Inc. dnl This file is free software, distributed under the terms of the GNU dnl General Public License. As a special exception to the GNU General dnl Public License, this file may be distributed as part of a program dnl that contains a configuration script generated by Autoconf, under dnl the same distribution terms as the rest of that program. dnl From Bruno Haible. dnl Test whether <stdbool.h> is supported or must be substituted. AC_DEFUN([gt_STDBOOL_H], [dnl gcc 2.95.2 has an <stdbool.h> for which both 'true' and 'false' evaluate dnl to 0 in preprocessor expressions. dnl HP-UX 11 cc has an <stdbool.h> but the compiler doesn't understand the dnl type '_Bool' (to which 'bool' expands). AC_MSG_CHECKING([for stdbool.h]) AC_CACHE_VAL(gt_cv_header_stdbool_h, [ AC_TRY_COMPILE([#include <stdbool.h> #if false int A[-1]; #endif #define b -1 #if true #undef b #define b 1 #endif int B[b]; bool c; ], [], gt_cv_header_stdbool_h=yes, gt_cv_header_stdbool_h=no)]) AC_MSG_RESULT([$gt_cv_header_stdbool_h]) if test $gt_cv_header_stdbool_h = yes; then AC_DEFINE(HAVE_STDBOOL_H, 1, [Define if you have a working <stdbool.h> header file.]) STDBOOL_H='' else STDBOOL_H='stdbool.h' AC_MSG_CHECKING([for _Bool type]) AC_CACHE_VAL(gt_cv_type_Bool, [ AC_TRY_COMPILE([_Bool x = sizeof (_Bool);], [], gt_cv_type_Bool=yes, gt_cv_type_Bool=no)]) AC_MSG_RESULT([$gt_cv_type_Bool]) if test $gt_cv_type_Bool = yes; then HAVE__BOOL=1 else HAVE__BOOL=0 fi AC_SUBST(HAVE__BOOL) fi AC_SUBST(STDBOOL_H) ])