# Check for stdbool.h that conforms to C99.
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002-2004 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
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
-# This file is only needed in autoconf <= 2.54. Newer versions of autoconf
+# Prepare for substituting <stdbool.h> 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 <= 2.59. Newer versions of autoconf
# have this macro built-in.
AC_DEFUN([AC_HEADER_STDBOOL],
"error: false is not 0"
#endif
#ifndef true
- "error: false is not defined"
+ "error: true is not defined"
#endif
#if true != 1
"error: true is not 1"
char g[true];
char h[sizeof (_Bool)];
char i[sizeof s.t];
+ enum { j = false, k = true, l = false * true, m = true * 256 };
+ _Bool n[m];
+ char o[sizeof n == m * sizeof n[0] ? 1 : -1];
+ ],
+ [
+ return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k + !l
+ + !m + !n + !o);
],
- [ 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])